Make header buttons smaller (#191)

* Audit fix

* Upade Next

.devcontainer/devcontainer.json

@@ -0,0 +1,42 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/javascript-node-postgres
+{
+    "name": "spliit",
+    "dockerComposeFile": "docker-compose.yml",
+    "service": "app",
+
+    // Features to add to the dev container. More info: https://containers.dev/features.
+    // "features": {
+    // 	   "ghcr.io/frntn/devcontainers-features/prism:1": {}
+    // },
+
+    // Use 'postCreateCommand' to run commands after the container is created.
+    "postCreateCommand": "cp container.env.example .env && npm install",
+    "postAttachCommand": {
+    	"npm": "npm run dev"
+    },
+
+    // Use 'forwardPorts' to make a list of ports inside the container available locally.
+    // This can be used to network with other containers or with the host.
+    "forwardPorts": [3000, 5432],
+    "portsAttributes": {
+            "3000": {
+                "label": "App"
+            },
+            "5432": {
+                "label": "PostgreSQL"
+            }
+    },
+
+    // Configure tool-specific properties.
+    "customizations": {
+        "codespaces": {
+            "openFiles": [
+                "README.md"
+            ]
+        }
+    }
+
+    // Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+    // "remoteUser": "root"
+}

.devcontainer/docker-compose.yml

@@ -0,0 +1,33 @@
+version: '3.8'
+
+services:
+  app:
+    image: mcr.microsoft.com/devcontainers/typescript-node:latest
+
+    volumes:
+      - ../..:/workspaces:cached
+      
+    # Overrides default command so things don't shut down after the process ends.
+    command: sleep infinity
+
+    # Runs app on the same network as the database container, allows "forwardPorts" in devcontainer.json function.
+    network_mode: service:db
+
+    # Use "forwardPorts" in **devcontainer.json** to forward an app port locally. 
+    # (Adding the "ports" property to this file will not forward from a Codespace.)
+
+  db:
+    image: postgres:latest
+    restart: unless-stopped
+    volumes:
+      - postgres-data:/var/lib/postgresql/data
+    environment:
+      POSTGRES_PASSWORD: 1234
+      POSTGRES_USER: postgres
+      POSTGRES_DB: postgres
+
+    # Add "forwardPorts": ["5432"] to **devcontainer.json** to forward PostgreSQL locally.
+    # (Adding the "ports" property to this file will not forward from a Codespace.)
+
+volumes:
+  postgres-data:

.gitignore

@@ -28,6 +28,7 @@ yarn-error.log*
 # local env files
 .env*.local
 *.env
+!scripts/build.env
 
 # vercel
 .vercel

Dockerfile

@@ -1,22 +1,48 @@
-FROM node:21-slim as base
+FROM node:21-alpine as base
+
+WORKDIR /usr/app
+COPY ./package.json \
+     ./package-lock.json \
+     ./next.config.js \
+     ./tsconfig.json \
+     ./reset.d.ts \
+     ./tailwind.config.js \
+     ./postcss.config.js ./
+COPY ./scripts ./scripts
+COPY ./prisma ./prisma
+
+RUN apk add --no-cache openssl && \
+    npm ci --ignore-scripts && \
+    npx prisma generate
+
+COPY ./src ./src
+
+ENV NEXT_TELEMETRY_DISABLED=1
+
+COPY scripts/build.env .env
+RUN npm run build
+
+RUN rm -r .next/cache
+
+FROM node:21-alpine as runtime-deps
+
+WORKDIR /usr/app
+COPY --from=base /usr/app/package.json /usr/app/package-lock.json /usr/app/next.config.js ./
+COPY --from=base /usr/app/prisma ./prisma
+
+RUN npm ci --omit=dev --omit=optional --ignore-scripts && \
+    npx prisma generate
+
+FROM node:21-alpine as runner
 
 EXPOSE 3000/tcp
 WORKDIR /usr/app
-COPY ./ ./
 
-RUN apt update && \
-    apt install openssl -y && \
-    apt clean && \
-    apt autoclean && \
-    apt autoremove && \
-    npm ci --ignore-scripts && \
-    npm install -g prisma && \
-    prisma generate
+COPY --from=base /usr/app/package.json /usr/app/package-lock.json /usr/app/next.config.js ./
+COPY --from=runtime-deps /usr/app/node_modules ./node_modules
+COPY ./public ./public
+COPY ./scripts ./scripts
+COPY --from=base /usr/app/prisma ./prisma
+COPY --from=base /usr/app/.next ./.next
 
-# env vars needed for build not to fail
-ARG POSTGRES_PRISMA_URL
-ARG POSTGRES_URL_NON_POOLING
-
-RUN npm run build
-
-ENTRYPOINT ["/usr/app/scripts/container-entrypoint.sh"]
+ENTRYPOINT ["/bin/sh", "/usr/app/scripts/container-entrypoint.sh"]

messages/en-US.json

@@ -0,0 +1,383 @@
+{
+  "Header": {
+    "groups": "Groups"
+  },
+  "Footer": {
+    "madeIn": "Made in Montréal, Québec 🇨🇦",
+    "builtBy": "Built by <author>Sebastien Castiel</author> and <source>contributors</source>"
+  },
+  "Expenses": {
+    "title": "Expenses",
+    "description": "Here are the expenses that you created for your group.",
+    "create": "Create expense",
+    "createFirst": "Create the first one",
+    "noExpenses": "Your group doesn’t contain any expense yet.",
+    "exportJson": "Export to JSON",
+    "searchPlaceholder": "Search for an expense…",
+    "ActiveUserModal": {
+      "title": "Who are you?",
+      "description": "Tell us which participant you are to let us customize how the information is displayed.",
+      "nobody": "I don’t want to select anyone",
+      "save": "Save changes",
+      "footer": "This setting can be changed later in the group settings."
+    },
+    "Groups": {
+      "upcoming": "Upcoming",
+      "thisWeek": "This week",
+      "earlierThisMonth": "Earlier this month",
+      "lastMonth": "Last month",
+      "earlierThisYear": "Earlier this year",
+      "lastYera": "Last year",
+      "older": "Older"
+    }
+  },
+  "ExpenseCard": {
+    "paidBy": "Paid by <strong>{paidBy}</strong> for <paidFor></paidFor>",
+    "receivedBy": "Received by <strong>{paidBy}</strong> for <paidFor></paidFor>",
+    "yourBalance": "Your balance:"
+  },
+  "Groups": {
+    "myGroups": "My groups",
+    "create": "Create",
+    "loadingRecent": "Loading recent groups…",
+    "NoRecent": {
+      "description": "You have not visited any group recently.",
+      "create": "Create one",
+      "orAsk": "or ask a friend to send you the link to an existing one."
+    },
+    "recent": "Recent groups",
+    "starred": "Starred groups",
+    "archived": "Archived groups",
+    "archive": "Archive group",
+    "unarchive": "Unarchive group",
+    "removeRecent": "Remove from recent groups",
+    "RecentRemovedToast": {
+      "title": "Group has been removed",
+      "description": "The group was removed from your recent groups list.",
+      "undoAlt": "Undo group removal",
+      "undo": "Undo"
+    },
+    "AddByURL": {
+      "button": "Add by URL",
+      "title": "Add a group by URL",
+      "description": "If a group was shared with you, you can paste its URL here to add it to your list.",
+      "error": "Oops, we are not able to find the group from the URL you provided…"
+    },
+    "NotFound": {
+      "text": "This group does not exist.",
+      "link": "Go to recently visited groups"
+    }
+  },
+  "GroupForm": {
+    "title": "Group information",
+    "NameField": {
+      "label": "Group name",
+      "placeholder": "Summer vacations",
+      "description": "Enter a name for your group."
+    },
+    "InformationField": {
+      "label": "Group information",
+      "placeholder": "What information is relevant to group participants?"
+    },
+    "CurrencyField": {
+      "label": "Currency symbol",
+      "placeholder": "$, €, £…",
+      "description": "We’ll use it to display amounts."
+    },
+    "Participants": {
+      "title": "Participants",
+      "description": "Enter the name for each participant.",
+      "protectedParticipant": "This participant is part of expenses, and can not be removed.",
+      "new": "New",
+      "add": "Add participant",
+      "John": "John",
+      "Jane": "Jane",
+      "Jack": "Jack"
+    },
+    "Settings": {
+      "title": "Local settings",
+      "description": "These settings are set per-device, and are used to customize your experience.",
+      "ActiveUserField": {
+        "label": "Active user",
+        "placeholder": "Select a participant",
+        "none": "None",
+        "description": "User used as default for paying expenses."
+      },
+      "save": "Save",
+      "saving": "Saving…",
+      "create": "Create",
+      "creating": "Creating…",
+      "cancel": "Cancel"
+    }
+  },
+  "ExpenseForm": {
+    "Income": {
+      "create": "Create income",
+      "edit": "Edit income",
+      "TitleField": {
+        "label": "Income title",
+        "placeholder": "Monday evening restaurant",
+        "description": "Enter a description for the income."
+      },
+      "DateField": {
+        "label": "Income date",
+        "description": "Enter the date the income was received."
+      },
+      "categoryFieldDescription": "Select the income category.",
+      "paidByField": {
+        "label": "Received by",
+        "description": "Select the participant who received the income."
+      },
+      "paidFor": {
+        "title": "Received for",
+        "description": "Select who the income was received for."
+      },
+      "splitModeDescription": "Select how to split the income.",
+      "attachDescription": "See and attach receipts to the income."
+    },
+    "Expense": {
+      "create": "Create expense",
+      "edit": "Edit expense",
+      "TitleField": {
+        "label": "Expense title",
+        "placeholder": "Monday evening restaurant",
+        "description": "Enter a description for the expense."
+      },
+      "DateField": {
+        "label": "Expense date",
+        "description": "Enter the date the expense was paid."
+      },
+      "categoryFieldDescription": "Select the expense category.",
+      "paidByField": {
+        "label": "Paid by",
+        "description": "Select the participant who paid the expense."
+      },
+      "paidFor": {
+        "title": "Paid for",
+        "description": "Select who the expense was paid for."
+      },
+      "splitModeDescription": "Select how to split the expense.",
+      "attachDescription": "See and attach receipts to the expense."
+    },
+    "amountField": {
+      "label": "Amount"
+    },
+    "isReimbursementField": {
+      "label": "This is a reimbursement"
+    },
+    "categoryField": {
+      "label": "Category"
+    },
+    "notesField": {
+      "label": "Notes"
+    },
+    "selectNone": "Select none",
+    "selectAll": "Select all",
+    "shares": "share(s)",
+    "advancedOptions": "Advanced splitting options…",
+    "SplitModeField": {
+      "label": "Split mode",
+      "evenly": "Evenly",
+      "byShares": "Unevenly – By shares",
+      "byPercentage": "Unevenly – By percentage",
+      "byAmount": "Unevenly – By amount",
+      "saveAsDefault": "Save as default splitting options"
+    },
+    "DeletePopup": {
+      "label": "Delete",
+      "title": "Delete this expense?",
+      "description": "Do you really want to delete this expense? This action is irreversible.",
+      "yes": "Yes",
+      "cancel": "Cancel"
+    },
+    "attachDocuments": "Attach documents",
+    "create": "Create",
+    "creating": "Creating…",
+    "save": "Save",
+    "saving": "Saving…",
+    "cancel": "Cancel"
+  },
+  "ExpenseDocumentsInput": {
+    "TooBigToast": {
+      "title": "The file is too big",
+      "description": "The maximum file size you can upload is {maxSize}. Yours is ${size}."
+    },
+    "ErrorToast": {
+      "title": "Error while uploading document",
+      "description": "Something wrong happened when uploading the document. Please retry later or select a different file.",
+      "retry": "Retry"
+    }
+  },
+  "CreateFromReceipt": {
+    "Dialog": {
+      "triggerTitle": "Create expense from receipt",
+      "title": "Create from receipt",
+      "description": "Extract the expense information from a receipt photo.",
+      "body": "Upload the photo of a receipt, and we’ll scan it to extract the expense information if we can.",
+      "selectImage": "Select image…",
+      "titleLabel": "Title:",
+      "categoryLabel": "Category:",
+      "amountLabel": "Amount:",
+      "dateLabel": "Date:",
+      "editNext": "You’ll be able to edit the expense information next.",
+      "continue": "Continue"
+    },
+    "unknown": "Unknown",
+    "TooBigToast": {
+      "title": "The file is too big",
+      "description": "The maximum file size you can upload is {maxSize}. Yours is ${size}."
+    },
+    "ErrorToast": {
+      "title": "Error while uploading document",
+      "description": "Something wrong happened when uploading the document. Please retry later or select a different file.",
+      "retry": "Retry"
+    }
+  },
+  "Balances": {
+    "title": "Balances",
+    "description": "This is the amount that each participant paid or was paid for.",
+    "Reimbursements": {
+      "title": "Suggested reimbursements",
+      "description": "Here are suggestions for optimized reimbursements between participants.",
+      "noImbursements": "It looks like your group doesn’t need any reimbursement 😁",
+      "owes": "<strong>{from}</strong> owes <strong>{to}</strong>",
+      "markAsPaid": "Mark as paid"
+    }
+  },
+  "Stats": {
+    "title": "Stats",
+    "Totals": {
+      "title": "Totals",
+      "description": "Spending summary of the entire group.",
+      "groupSpendings": "Total group spendings",
+      "groupEarnings": "Total group earnings",
+      "yourSpendings": "Your total spendings",
+      "yourEarnings": "Your total earnings",
+      "yourShare": "Your total share"
+    }
+  },
+  "Activity": {
+    "title": "Activity",
+    "description": "Overview of all activity in this group.",
+    "noActivity": "There is not yet any activity in your group.",
+    "someone": "Someone",
+    "settingsModified": "Group settings were modified by <strong>{participant}</strong>.",
+    "expenseCreated": "Expense <em>{expense}</em> created by <strong>{participant}</strong>.",
+    "expenseUpdated": "Expense <em>{expense}</em> updated by <strong>{participant}</strong>.",
+    "expenseDeleted": "Expense <em>{expense}</em> deleted by <strong>{participant}</strong>.",
+    "Groups": {
+      "today": "Today",
+      "yesterday": "Yesterday",
+      "earlierThisWeek": "Earlier this week",
+      "lastWeek": "Last week",
+      "earlierThisMonth": "Earlier this month",
+      "lastMonth": "Last month",
+      "earlierThisYear": "Earlier this year",
+      "lastYear": "Last year",
+      "older": "Older"
+    }
+  },
+  "Information": {
+    "title": "Information",
+    "description": "Use this place to add any information that can be relevant to the group participants.",
+    "empty": "No group information yet."
+  },
+  "Settings": {
+    "title": "Settings"
+  },
+  "Locale": {
+    "en-US": "English",
+    "fi": "Suomi"
+  },
+  "Share": {
+    "title": "Share",
+    "description": "For other participants to see the group and add expenses, share its URL with them.",
+    "warning": "Warning!",
+    "warningHelp": "Every person with the group URL will be able to see and edit expenses. Share with caution!"
+  },
+  "SchemaErrors": {
+    "min1": "Enter at least one character.",
+    "min2": "Enter at least two characters.",
+    "max5": "Enter at most five characters.",
+    "max50": "Enter at most 50 characters.",
+    "duplicateParticipantName": "Another participant already has this name.",
+    "titleRequired": "Please enter a title.",
+    "invalidNumber": "Invalid number.",
+    "amountRequired": "You must enter an amount.",
+    "amountNotZero": "The amount must not be zero.",
+    "amountTenMillion": "The amount must be lower than 10,000,000.",
+    "paidByRequired": "You must select a participant.",
+    "paidForMin1": "The expense must be paid for at least one participant.",
+    "noZeroShares": "All shares must be higher than 0.",
+    "amountSum": "Sum of amounts must equal the expense amount.",
+    "percentageSum": "Sum of percentages must equal 100."
+  },
+  "Categories": {
+    "search": "Search category...",
+    "noCategory": "No category found.",
+    "Uncategorized": {
+      "heading": "Uncategorized",
+      "General": "General",
+      "Payment": "Payment"
+    },
+    "Entertainment": {
+      "heading": "Entertainment",
+      "Entertainment": "Entertainment",
+      "Games": "Games",
+      "Movies": "Movies",
+      "Music": "Music",
+      "Sports": "Sports"
+    },
+    "Food and Drink": {
+      "heading": "Food and Drink",
+      "Food and Drink": "Food and Drink",
+      "Dining Out": "Dining Out",
+      "Groceries": "Groceries",
+      "Liquor": "Liquor"
+    },
+    "Home": {
+      "heading": "Home",
+      "Home": "Home",
+      "Electronics": "Electronics",
+      "Furniture": "Furniture",
+      "Household Supplies": "Household Supplies",
+      "Maintenance": "Maintenance",
+      "Mortgage": "Mortgage",
+      "Pets": "Pets",
+      "Rent": "Rent",
+      "Services": "Services"
+    },
+    "Life": {
+      "heading": "Life",
+      "Childcare": "Childcare",
+      "Clothing": "Clothing",
+      "Education": "Education",
+      "Gifts": "Gifts",
+      "Insurance": "Insurance",
+      "Medical Expenses": "Medical Expenses",
+      "Taxes": "Taxes"
+    },
+    "Transportation": {
+      "heading": "Transportation",
+      "Transportation": "Transportation",
+      "Bicycle": "Bicycle",
+      "Bus/Train": "Bus/Train",
+      "Car": "Car",
+      "Gas/Fuel": "Gas/Fuel",
+      "Hotel": "Hotel",
+      "Parking": "Parking",
+      "Plane": "Plane",
+      "Taxi": "Taxi"
+    },
+    "Utilities": {
+      "heading": "Utilities",
+      "Utilities": "Utilities",
+      "Cleaning": "Cleaning",
+      "Electricity": "Electricity",
+      "Heat/Gas": "Heat/Gas",
+      "Trash": "Trash",
+      "TV/Phone/Internet": "TV/Phone/Internet",
+      "Water": "Water"
+    }
+  }
+}

messages/fi.json

@@ -0,0 +1,383 @@
+{
+  "Header": {
+    "groups": "Ryhmät"
+  },
+  "Footer": {
+    "madeIn": "Made in Montréal, Québec 🇨🇦",
+    "builtBy": "Tekijät: <author>Sebastien Castiel</author> ja <source>muut osallistujat</source>"
+  },
+  "Expenses": {
+    "title": "Kulut",
+    "description": "Tässä ovat ryhmässä luodut kulut.",
+    "create": "Lisää kulu",
+    "createFirst": "Lisää ensimmäinen kulu",
+    "noExpenses": "Ryhmälläsi ei ole vielä yhtään kulua.",
+    "exportJson": "Vie JSON-tiedostoon",
+    "searchPlaceholder": "Etsi kulua…",
+    "ActiveUserModal": {
+      "title": "Kuka olet?",
+      "description": "Valitse kuka osallistujista olet, jotta tiedot näkyvät oikein.",
+      "nobody": "En halua valita ketään",
+      "save": "Tallenna muutokset",
+      "footer": "Tämän asetuksen voi vaihtaa myöhemmin ryhmän asetuksista."
+    },
+    "Groups": {
+      "upcoming": "Tulevat",
+      "thisWeek": "Tällä viikolla",
+      "earlierThisMonth": "Aikaisemmin tässä kuussa",
+      "lastMonth": "Viime kuussa",
+      "earlierThisYear": "Aikaisemmin tänä vuonna",
+      "lastYear": "Viime vuonna",
+      "older": "Vanhemmat"
+    }
+  },
+  "ExpenseCard": {
+    "paidBy": "<strong>{paidBy}</strong> maksoi {forCount, plural, =1 {henkilön} other {henkilöiden}} <paidFor></paidFor> puolesta",
+    "receivedBy": "<strong>{paidBy}</strong> sai rahaa {forCount, plural, =1 {henkilön} other {henkilöiden}} <paidFor></paidFor> puolesta",
+    "yourBalance": "Saldosi:"
+  },
+  "Groups": {
+    "myGroups": "Omat ryhmät",
+    "create": "Luo ryhmä",
+    "loadingRecent": "Ladataan äskettäisiä ryhmiä…",
+    "NoRecent": {
+      "description": "Et ole ollut missään ryhmässä äskettäin.",
+      "create": "Luo uusi ryhmä",
+      "orAsk": "tai pyydä ystävää lähettämään linkki olemassaolevaan ryhmään."
+    },
+    "recent": "Äskettäiset",
+    "starred": "Suosikit",
+    "archived": "Arkistoidut",
+    "archive": "Arkistoi ryhmä",
+    "unarchive": "Palauta ryhmä arkistosta",
+    "removeRecent": "Poista äskettäisistä",
+    "RecentRemovedToast": {
+      "title": "Ryhmä poistettu",
+      "description": "Ryhmä poistettu äskettäisten listaltasi.",
+      "undoAlt": "Peruuta ryhmän poisto",
+      "undo": "Peruuta"
+    },
+    "AddByURL": {
+      "button": "Lisää URLilla",
+      "title": "Lisää ryhmä URL-osoitteella",
+      "description": "Jos ryhmä on jaettu sinulle, voit lisätä sen listaasi liittämällä URL-osoitteen tähän.",
+      "error": "Hups, emme löytäneet ryhmää antamastasi URL-osoitteesta…"
+    },
+    "NotFound": {
+      "text": "Tätä ryhmää ei löydy.",
+      "link": "Siirry äskettäisiin ryhmiin"
+    }
+  },
+  "GroupForm": {
+    "title": "Ryhmän tiedot",
+    "NameField": {
+      "label": "Ryhmän nimi",
+      "placeholder": "Kesälomareissu",
+      "description": "Syötä ryhmäsi nimi."
+    },
+    "InformationField": {
+      "label": "Ryhmän tiedot",
+      "placeholder": "Mitkä tiedot ovat merkityksellisiä ryhmän osallistujille?"
+    },
+    "CurrencyField": {
+      "label": "Valuuttamerkki",
+      "placeholder": "$, €, £…",
+      "description": "Näytetään rahasummien yhteydessä."
+    },
+    "Participants": {
+      "title": "Osallistujat",
+      "description": "Syötä jokaisen osallistujan nimi.",
+      "protectedParticipant": "Tätä osallistujaa ei voida poistaa, koska hän osallistuu kuluihin.",
+      "add": "Lisää osallistuja",
+      "new": "Uusi",
+      "John": "Antti",
+      "Jane": "Laura",
+      "Jack": "Jussi"
+    },
+    "Settings": {
+      "title": "Paikalliset asetukset",
+      "description": "Nämä asetukset ovat laitekohtaisia. Voit muokata niillä käytettävyyttä.",
+      "ActiveUserField": {
+        "label": "Aktiivinen käyttäjä",
+        "placeholder": "Valitse osallistuja",
+        "none": "Ei kukaan",
+        "description": "Käytetään kulujen oletusmaksajana."
+      },
+      "save": "Tallenna",
+      "saving": "Tallennetaan…",
+      "create": "Luo ryhmä",
+      "creating": "Luodaan…",
+      "cancel": "Peruuta"
+    }
+  },
+  "ExpenseForm": {
+    "Income": {
+      "create": "Lisää tulo",
+      "edit": "Muokkaa tuloa",
+      "TitleField": {
+        "label": "Otsikko",
+        "placeholder": "Maanantain ravintola",
+        "description": "Anna lyhyt kuvaus tulolle."
+      },
+      "DateField": {
+        "label": "Päivä",
+        "description": "Valitse päivä jolloin tulo saatiin."
+      },
+      "categoryFieldDescription": "Valitse tulokategoria.",
+      "paidByField": {
+        "label": "Vastaanottaja",
+        "description": "Valitse kuka vastaanotti tulon."
+      },
+      "paidFor": {
+        "title": "Tulon jakaminen",
+        "description": "Valitse kenelle tulo jaetaan."
+      },
+      "splitModeDescription": "Valitse miten tulo jaetaan osallistujien kesken.",
+      "attachDescription": "Katso ja liitä tuloon liittyviä kuitteja."
+    },
+    "Expense": {
+      "create": "Lisää kulu",
+      "edit": "Muokkaa kulua",
+      "TitleField": {
+        "label": "Otsikko",
+        "placeholder": "Maanantain ravintola",
+        "description": "Anna lyhyt kuvaus kululle."
+      },
+      "DateField": {
+        "label": "Päivä",
+        "description": "Valitse päivä jolloin kulu maksettiin."
+      },
+      "categoryFieldDescription": "Valitse kulukategoria.",
+      "paidByField": {
+        "label": "Maksaja",
+        "description": "Valitse kuka maksoi kulun."
+      },
+      "paidFor": {
+        "title": "Kulun jakaminen",
+        "description": "Valitse ketkä osallistuvat kuluun."
+      },
+      "splitModeDescription": "Valitse miten kulu jaetaan osallistujien kesken.",
+      "attachDescription": "Katso ja liitä kuluun liittyviä kuitteja."
+    },
+    "amountField": {
+      "label": "Summa"
+    },
+    "isReimbursementField": {
+      "label": "Tämä on velanmaksu"
+    },
+    "categoryField": {
+      "label": "Kategoria"
+    },
+    "notesField": {
+      "label": "Muistiinpanot"
+    },
+    "selectNone": "Tyhjennä valinnat",
+    "selectAll": "Valitse kaikki",
+    "shares": "osuutta",
+    "advancedOptions": "Lisäasetuksia jakamiseen…",
+    "SplitModeField": {
+      "label": "Jakamistapa",
+      "evenly": "Tasan",
+      "byShares": "Epätasan – osuuksien mukaan",
+      "byPercentage": "Epätasan – prosenttien mukaan",
+      "byAmount": "Epätasan – summan mukaan",
+      "saveAsDefault": "Tallenna oletustavaksi"
+    },
+    "DeletePopup": {
+      "label": "Poista",
+      "title": "Poistetaanko tämä kulu?",
+      "description": "Haluatko varmasti poistaa tämän kulun? Poistoa ei voi peruuttaa.",
+      "yes": "Kyllä",
+      "cancel": "Peruuta"
+    },
+    "attachDocuments": "Liitä dokumenttejä",
+    "create": "Lisää kulu",
+    "creating": "Luodaan kulua…",
+    "save": "Tallenna",
+    "saving": "Tallennetaan…",
+    "cancel": "Peruuta"
+  },
+  "ExpenseDocumentsInput": {
+    "TooBigToast": {
+      "title": "Tiedosto on liian suuri",
+      "description": "Maksimikoko ladattavalle tiedostolle on {maxSize}. Tiedostosi on ${size}."
+    },
+    "ErrorToast": {
+      "title": "Virhe tiedostoa ladattaessa",
+      "description": "Jokin meni vikaan dokumentin lataamisessa. Yritä myöhemmin uudelleen tai valitse toinen tiedosto.",
+      "retry": "Yritä uudelleen"
+    }
+  },
+  "CreateFromReceipt": {
+    "Dialog": {
+      "triggerTitle": "Luo kulu kuitista",
+      "title": "Luo kuitista",
+      "description": "Lue kuitin valokuvasta kulun tiedot.",
+      "body": "Lataa kuitista valokuva. Siitä skannataan tiedot kulua varten.",
+      "selectImage": "Valitse kuva…",
+      "titleLabel": "Otsikko:",
+      "categoryLabel": "Kategoria:",
+      "amountLabel": "Summa:",
+      "dateLabel": "Päivä:",
+      "editNext": "Voit muokata kulun tietoja seuraavaksi.",
+      "continue": "Jatka"
+    },
+    "unknown": "Unknown",
+    "TooBigToast": {
+      "title": "The file is too big",
+      "description": "The maximum file size you can upload is {maxSize}. Yours is ${size}."
+    },
+    "ErrorToast": {
+      "title": "Error while uploading document",
+      "description": "Something wrong happened when uploading the document. Please retry later or select a different file.",
+      "retry": "Retry"
+    }
+  },
+  "Balances": {
+    "title": "Saldo",
+    "description": "Osallistujien saatavat tai velat.",
+    "Reimbursements": {
+      "title": "Maksuehdotus",
+      "description": "Optimoitu ehdotus kuka maksaa kenellekin.",
+      "noImbursements": "Näyttää siltä, että kaikki ovat sujut 😁",
+      "owes": "<strong>{from}</strong> maksaa henkilölle <strong>{to}</strong>",
+      "markAsPaid": "Merkitse maksetuksi"
+    }
+  },
+  "Stats": {
+    "title": "Tilastot",
+    "Totals": {
+      "title": "Yhteenveto",
+      "description": "Koko ryhmän kulut.",
+      "groupSpendings": "Koko ryhmän kulutus",
+      "groupEarnings": "Koko ryhmän saatavat",
+      "yourSpendings": "Kulutuksesi",
+      "yourEarnings": "Saatavasi",
+      "yourShare": "Osuutesi"
+    }
+  },
+  "Activity": {
+    "title": "Tapahtumat",
+    "description": "Yleisnäkymä ryhmän kaikista tapahtumista.",
+    "noActivity": "Ryhmässäsi ei ole vielä tapahtumia.",
+    "someone": "Tuntematon",
+    "settingsModified": "<strong>{participant}</strong> muokkasi ryhmän asetuksia.",
+    "expenseCreated": "<strong>{participant}</strong> lisäsi kulun <em>{expense}</em>.",
+    "expenseUpdated": "<strong>{participant}</strong> muokkasi kulua <em>{expense}</em>.",
+    "expenseDeleted": "<strong>{participant}</strong> poisti kulun <em>{expense}</em>.",
+    "Groups": {
+      "today": "Tänään",
+      "yesterday": "Eilen",
+      "earlierThisWeek": "Tällä viikolla",
+      "lastWeek": "Viime viikolla",
+      "earlierThisMonth": "Tässä kuussa",
+      "lastMonth": "Viime kuussa",
+      "earlierThisYear": "Tänä vuonna",
+      "lastYear": "Viime vuonna",
+      "older": "Vanhemmat"
+    }
+  },
+  "Information": {
+    "title": "Tiedot",
+    "description": "Käytä tätä paikkaa lisätäksesi kaikki tiedot, joilla voi olla merkitystä ryhmän osallistujille.",
+    "empty": "Ryhmätietoja ei vielä ole."
+  },
+  "Settings": {
+    "title": "Asetukset"
+  },
+  "Locale": {
+    "en-US": "English",
+    "fi": "Suomi"
+  },
+  "Share": {
+    "title": "Jaa",
+    "description": "Jaa ryhmän URL muille jäsenille, jotta he voivat nähdä sen ja lisätä kuluja.",
+    "warning": "Varoitus!",
+    "warningHelp": "Tällä URLilla kuka tahansa pääsee näkemään ja muokkaamaan kuluja. Jaa harkiten!"
+  },
+  "SchemaErrors": {
+    "min1": "Syötä vähintään yksi merkki.",
+    "min2": "Syötä vähintään kaksi merkkiä.",
+    "max5": "Syötä enintään viisi merkkiä.",
+    "max50": "Syötä enintään 50 merkkiä.",
+    "duplicateParticipantName": "Tämä nimi on jo toisella osallistujalla.",
+    "titleRequired": "Otsikko puuttuu.",
+    "invalidNumber": "Epäkelpo numero.",
+    "amountRequired": "Summa puuttuu.",
+    "amountNotZero": "Summa ei voi olla nolla.",
+    "amountTenMillion": "Summan pitää olla pienempi kuin 10 000 000.",
+    "paidByRequired": "Osallistuja puuttuu.",
+    "paidForMin1": "Valitse vähintään yksi osallistuja.",
+    "noZeroShares": "Jokaisen osuuden täytyy olla suurempi kuin 0.",
+    "amountSum": "Osuuksien summan täytyy vastata kulun summaa.",
+    "percentageSum": "Prosenttiosuuksien summan täytyy olla 100."
+  },
+  "Categories": {
+    "search": "Etsi kategoriaa...",
+    "noCategory": "Kategoriaa ei löydy.",
+    "Uncategorized": {
+      "heading": "Yleiset",
+      "General": "Yleinen",
+      "Payment": "Maksu"
+    },
+    "Entertainment": {
+      "heading": "Viihde",
+      "Entertainment": "Viihde",
+      "Games": "Pelit",
+      "Movies": "Elokuvat",
+      "Music": "Musiikki",
+      "Sports": "Urheilu"
+    },
+    "Food and Drink": {
+      "heading": "Ruoka ja juoma",
+      "Food and Drink": "Ruoka ja juoma",
+      "Dining Out": "Ulkona syöminen",
+      "Groceries": "Marketti",
+      "Liquor": "Alkoholi"
+    },
+    "Home": {
+      "heading": "Koti",
+      "Home": "Koti",
+      "Electronics": "Elektroniikka",
+      "Furniture": "Huonekalut",
+      "Household Supplies": "Taloustavarat",
+      "Maintenance": "Huolto",
+      "Mortgage": "Laina",
+      "Pets": "Lemmikit",
+      "Rent": "Vuokra",
+      "Services": "Palvelut"
+    },
+    "Life": {
+      "heading": "Elämä",
+      "Childcare": "Lastenhoito",
+      "Clothing": "Vaatteet",
+      "Education": "Opiskelu",
+      "Gifts": "Lahjat",
+      "Insurance": "Vakuutukset",
+      "Medical Expenses": "Terveydenhoito",
+      "Taxes": "Verot"
+    },
+    "Transportation": {
+      "heading": "Liikenne",
+      "Transportation": "Liikenne",
+      "Bicycle": "Polkupyörä",
+      "Bus/Train": "Bussi/juna",
+      "Car": "Auto",
+      "Gas/Fuel": "Polttoaine",
+      "Hotel": "Hotelli",
+      "Parking": "Pysäköinti",
+      "Plane": "Lentäminen",
+      "Taxi": "Taksi"
+    },
+    "Utilities": {
+      "heading": "Sekalaiset",
+      "Utilities": "Sekalaiset",
+      "Cleaning": "Siivous",
+      "Electricity": "Sähkö",
+      "Heat/Gas": "Lämmitys",
+      "Trash": "Jätehuolto",
+      "TV/Phone/Internet": "TV/Puhelin/Internet",
+      "Water": "Vesi"
+    }
+  }
+}

next.config.mjs

@@ -1,4 +1,8 @@
-/** 
+import createNextIntlPlugin from 'next-intl/plugin'
+
+const withNextIntl = createNextIntlPlugin()
+
+/**
  * Undefined entries are not supported. Push optional patterns to this array only if defined.
  * @type {import('next/dist/shared/lib/image-config').RemotePattern}
  */
@@ -23,6 +27,12 @@ const nextConfig = {
   images: {
     remotePatterns
   },
+  // Required to run in a codespace (see https://github.com/vercel/next.js/issues/58019)
+  experimental: {
+    serverActions: {
+        allowedOrigins: ['localhost:3000'],
+    },
+},
 }
 
-module.exports = nextConfig
+export default withNextIntl(nextConfig)

package.json

@@ -9,11 +9,13 @@
     "lint": "next lint",
     "check-types": "tsc --noEmit",
     "check-formatting": "prettier -c src",
+    "prettier": "prettier -w src",
     "postinstall": "prisma migrate deploy && prisma generate",
     "build-image": "./scripts/build-image.sh",
     "start-container": "docker compose --env-file container.env up"
   },
   "dependencies": {
+    "@formatjs/intl-localematcher": "^0.5.4",
     "@hookform/resolvers": "^3.3.2",
     "@prisma/client": "^5.6.0",
     "@radix-ui/react-checkbox": "^1.0.4",
@@ -38,15 +40,19 @@
     "embla-carousel-react": "^8.0.0-rc21",
     "lucide-react": "^0.290.0",
     "nanoid": "^5.0.4",
-    "next": "^14.1.0",
+    "negotiator": "^0.6.3",
+    "next": "^14.2.5",
+    "next-intl": "^3.17.2",
     "next-s3-upload": "^0.3.4",
     "next-themes": "^0.2.1",
     "next13-progressbar": "^1.1.1",
     "openai": "^4.25.0",
     "pg": "^8.11.3",
-    "react": "^18.2.0",
-    "react-dom": "^18.2.0",
+    "prisma": "^5.7.0",
+    "react": "^18.3.1",
+    "react-dom": "^18.3.1",
     "react-hook-form": "^7.47.0",
+    "react-intersection-observer": "^9.8.0",
     "sharp": "^0.33.2",
     "tailwind-merge": "^1.14.0",
     "tailwindcss-animate": "^1.0.7",
@@ -58,6 +64,7 @@
   "devDependencies": {
     "@total-typescript/ts-reset": "^0.5.1",
     "@types/content-disposition": "^0.5.8",
+    "@types/negotiator": "^0.6.3",
     "@types/node": "^20",
     "@types/pg": "^8.10.9",
     "@types/react": "^18.2.48",
@@ -70,7 +77,6 @@
     "postcss": "^8",
     "prettier": "^3.0.3",
     "prettier-plugin-organize-imports": "^3.2.3",
-    "prisma": "^5.7.0",
     "tailwindcss": "^3",
     "tsconfig-paths": "^4.2.0",
     "typescript": "^5.3.3"

prisma/migrations/20240310194006_add_notes_in_expense/migration.sql

@@ -0,0 +1,2 @@
+-- AlterTable
+ALTER TABLE "Expense" ADD COLUMN     "notes" TEXT;

prisma/migrations/20240414135355_add_activity_log/migration.sql

@@ -0,0 +1,18 @@
+-- CreateEnum
+CREATE TYPE "ActivityType" AS ENUM ('UPDATE_GROUP', 'CREATE_EXPENSE', 'UPDATE_EXPENSE', 'DELETE_EXPENSE');
+
+-- CreateTable
+CREATE TABLE "Activity" (
+    "id" TEXT NOT NULL,
+    "groupId" TEXT NOT NULL,
+    "time" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "activityType" "ActivityType" NOT NULL,
+    "participantId" TEXT,
+    "expenseId" TEXT,
+    "data" TEXT,
+
+    CONSTRAINT "Activity_pkey" PRIMARY KEY ("id")
+);
+
+-- AddForeignKey
+ALTER TABLE "Activity" ADD CONSTRAINT "Activity_groupId_fkey" FOREIGN KEY ("groupId") REFERENCES "Group"("id") ON DELETE RESTRICT ON UPDATE CASCADE;

prisma/migrations/20240531154748_add_group_information/migration.sql

@@ -0,0 +1,2 @@
+-- AlterTable
+ALTER TABLE "Group" ADD COLUMN     "information" TEXT;

prisma/schema.prisma

@@ -14,9 +14,11 @@ datasource db {
 model Group {
   id           String        @id
   name         String
+  information  String?       @db.Text
   currency     String        @default("$")
   participants Participant[]
   expenses     Expense[]
+  activities   Activity[]
   createdAt    DateTime      @default(now())
 }
 
@@ -52,6 +54,7 @@ model Expense {
   splitMode       SplitMode         @default(EVENLY)
   createdAt       DateTime          @default(now())
   documents       ExpenseDocument[]
+  notes           String?
 }
 
 model ExpenseDocument {
@@ -79,3 +82,21 @@ model ExpensePaidFor {
 
   @@id([expenseId, participantId])
 }
+
+model Activity {
+  id            String       @id
+  group         Group        @relation(fields: [groupId], references: [id])
+  groupId       String
+  time          DateTime     @default(now())
+  activityType  ActivityType
+  participantId String?
+  expenseId     String?
+  data          String?
+}
+
+enum ActivityType {
+  UPDATE_GROUP
+  CREATE_EXPENSE
+  UPDATE_EXPENSE
+  DELETE_EXPENSE
+}

scripts/build-image.sh

@@ -5,9 +5,6 @@ SPLIIT_VERSION=$(node -p -e "require('./package.json').version")
 
 # we need to set dummy data for POSTGRES env vars in order for build not to fail
 docker buildx build \
-    --no-cache \
-    --build-arg POSTGRES_PRISMA_URL=postgresql://build:@db \
-    --build-arg POSTGRES_URL_NON_POOLING=postgresql://build:@db \
     -t ${SPLIIT_APP_NAME}:${SPLIIT_VERSION} \
     -t ${SPLIIT_APP_NAME}:latest \
     .

scripts/build.env

@@ -0,0 +1,22 @@
+# build file that contains all possible env vars with mocked values
+# as most of them are used at build time in order to have the production build to work properly
+
+# db
+POSTGRES_PASSWORD=1234
+
+# app
+POSTGRES_PRISMA_URL=postgresql://postgres:${POSTGRES_PASSWORD}@db
+POSTGRES_URL_NON_POOLING=postgresql://postgres:${POSTGRES_PASSWORD}@db
+
+# app-minio
+NEXT_PUBLIC_ENABLE_EXPENSE_DOCUMENTS=false
+S3_UPLOAD_KEY=AAAAAAAAAAAAAAAAAAAA
+S3_UPLOAD_SECRET=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+S3_UPLOAD_BUCKET=spliit
+S3_UPLOAD_REGION=eu-north-1
+S3_UPLOAD_ENDPOINT=s3://minio.example.com
+
+# app-openai
+NEXT_PUBLIC_ENABLE_RECEIPT_EXTRACT=false
+OPENAI_API_KEY=XXXXXXXXXXXXXXXXXXXXXXXXXXXX
+NEXT_PUBLIC_ENABLE_CATEGORY_EXTRACT=false

scripts/container-entrypoint.sh

@@ -1,3 +1,6 @@
 #!/bin/bash
-prisma migrate deploy
+
+set -euxo pipefail
+
+npx prisma migrate deploy
 npm run start

scripts/start-local-db.sh

@@ -1,4 +1,4 @@
-result=$(docker ps | grep postgres)
+result=$(docker ps | grep spliit-db)
 if [ $? -eq 0 ];
 then
     echo "postgres is already running, doing nothing"
@@ -6,6 +6,6 @@ else
     echo "postgres is not running, starting it"
     docker rm postgres --force
     mkdir -p postgres-data
-    docker run --name postgres -d -p 5432:5432 -e POSTGRES_PASSWORD=1234 -v ./postgres-data:/var/lib/postgresql/data postgres
+    docker run --name spliit-db -d -p 5432:5432 -e POSTGRES_PASSWORD=1234 -v "/$(pwd)/postgres-data:/var/lib/postgresql/data" postgres
     sleep 5 # Wait for postgres to start
 fi

src/app/groups/[groupId]/activity/activity-item.tsx

@@ -0,0 +1,95 @@
+'use client'
+import { Button } from '@/components/ui/button'
+import { getGroupExpenses } from '@/lib/api'
+import { DateTimeStyle, cn, formatDate } from '@/lib/utils'
+import { Activity, ActivityType, Participant } from '@prisma/client'
+import { ChevronRight } from 'lucide-react'
+import { useLocale, useTranslations } from 'next-intl'
+import Link from 'next/link'
+import { useRouter } from 'next/navigation'
+
+type Props = {
+  groupId: string
+  activity: Activity
+  participant?: Participant
+  expense?: Awaited<ReturnType<typeof getGroupExpenses>>[number]
+  dateStyle: DateTimeStyle
+}
+
+function useSummary(activity: Activity, participantName?: string) {
+  const t = useTranslations('Activity')
+  const participant = participantName ?? t('someone')
+  const expense = activity.data ?? ''
+
+  const tr = (key: string) =>
+    t.rich(key, {
+      expense,
+      participant,
+      em: (chunks) => <em>&ldquo;{chunks}&rdquo;</em>,
+      strong: (chunks) => <strong>{chunks}</strong>,
+    })
+
+  if (activity.activityType == ActivityType.UPDATE_GROUP) {
+    return <>{tr('settingsModified')}</>
+  } else if (activity.activityType == ActivityType.CREATE_EXPENSE) {
+    return <>{tr('expenseCreated')}</>
+  } else if (activity.activityType == ActivityType.UPDATE_EXPENSE) {
+    return <>{tr('expenseUpdated')}</>
+  } else if (activity.activityType == ActivityType.DELETE_EXPENSE) {
+    return <>{tr('expenseDeleted')}</>
+  }
+}
+
+export function ActivityItem({
+  groupId,
+  activity,
+  participant,
+  expense,
+  dateStyle,
+}: Props) {
+  const router = useRouter()
+  const locale = useLocale()
+
+  const expenseExists = expense !== undefined
+  const summary = useSummary(activity, participant?.name)
+
+  return (
+    <div
+      className={cn(
+        'flex justify-between sm:rounded-lg px-2 sm:pr-1 sm:pl-2 py-2 text-sm hover:bg-accent gap-1 items-stretch',
+        expenseExists && 'cursor-pointer',
+      )}
+      onClick={() => {
+        if (expenseExists) {
+          router.push(`/groups/${groupId}/expenses/${activity.expenseId}/edit`)
+        }
+      }}
+    >
+      <div className="flex flex-col justify-between items-start">
+        {dateStyle !== undefined && (
+          <div className="mt-1 text-xs/5 text-muted-foreground">
+            {formatDate(activity.time, locale, { dateStyle })}
+          </div>
+        )}
+        <div className="my-1 text-xs/5 text-muted-foreground">
+          {formatDate(activity.time, locale, { timeStyle: 'short' })}
+        </div>
+      </div>
+      <div className="flex-1">
+        <div className="m-1">{summary}</div>
+      </div>
+      {expenseExists && (
+        <Button
+          size="icon"
+          variant="link"
+          className="self-center hidden sm:flex w-5 h-5"
+          asChild
+        >
+          <Link href={`/groups/${groupId}/expenses/${activity.expenseId}/edit`}>
+            <ChevronRight className="w-4 h-4" />
+          </Link>
+        </Button>
+      )}
+    </div>
+  )
+}

src/app/groups/[groupId]/activity/activity-list.tsx

@@ -0,0 +1,112 @@
+import { ActivityItem } from '@/app/groups/[groupId]/activity/activity-item'
+import { getGroupExpenses } from '@/lib/api'
+import { Activity, Participant } from '@prisma/client'
+import dayjs, { type Dayjs } from 'dayjs'
+import { useTranslations } from 'next-intl'
+
+type Props = {
+  groupId: string
+  participants: Participant[]
+  expenses: Awaited<ReturnType<typeof getGroupExpenses>>
+  activities: Activity[]
+}
+
+const DATE_GROUPS = {
+  TODAY: 'today',
+  YESTERDAY: 'yesterday',
+  EARLIER_THIS_WEEK: 'earlierThisWeek',
+  LAST_WEEK: 'lastWeek',
+  EARLIER_THIS_MONTH: 'earlierThisMonth',
+  LAST_MONTH: 'lastMonth',
+  EARLIER_THIS_YEAR: 'earlierThisYear',
+  LAST_YEAR: 'lastYear',
+  OLDER: 'older',
+}
+
+function getDateGroup(date: Dayjs, today: Dayjs) {
+  if (today.isSame(date, 'day')) {
+    return DATE_GROUPS.TODAY
+  } else if (today.subtract(1, 'day').isSame(date, 'day')) {
+    return DATE_GROUPS.YESTERDAY
+  } else if (today.isSame(date, 'week')) {
+    return DATE_GROUPS.EARLIER_THIS_WEEK
+  } else if (today.subtract(1, 'week').isSame(date, 'week')) {
+    return DATE_GROUPS.LAST_WEEK
+  } else if (today.isSame(date, 'month')) {
+    return DATE_GROUPS.EARLIER_THIS_MONTH
+  } else if (today.subtract(1, 'month').isSame(date, 'month')) {
+    return DATE_GROUPS.LAST_MONTH
+  } else if (today.isSame(date, 'year')) {
+    return DATE_GROUPS.EARLIER_THIS_YEAR
+  } else if (today.subtract(1, 'year').isSame(date, 'year')) {
+    return DATE_GROUPS.LAST_YEAR
+  } else {
+    return DATE_GROUPS.OLDER
+  }
+}
+
+function getGroupedActivitiesByDate(activities: Activity[]) {
+  const today = dayjs()
+  return activities.reduce(
+    (result: { [key: string]: Activity[] }, activity: Activity) => {
+      const activityGroup = getDateGroup(dayjs(activity.time), today)
+      result[activityGroup] = result[activityGroup] ?? []
+      result[activityGroup].push(activity)
+      return result
+    },
+    {},
+  )
+}
+
+export function ActivityList({
+  groupId,
+  participants,
+  expenses,
+  activities,
+}: Props) {
+  const t = useTranslations('Activity')
+  const groupedActivitiesByDate = getGroupedActivitiesByDate(activities)
+
+  return activities.length > 0 ? (
+    <>
+      {Object.values(DATE_GROUPS).map((dateGroup: string) => {
+        let groupActivities = groupedActivitiesByDate[dateGroup]
+        if (!groupActivities || groupActivities.length === 0) return null
+        const dateStyle =
+          dateGroup == DATE_GROUPS.TODAY || dateGroup == DATE_GROUPS.YESTERDAY
+            ? undefined
+            : 'medium'
+
+        return (
+          <div key={dateGroup}>
+            <div
+              className={
+                'text-muted-foreground text-xs py-1 font-semibold sticky top-16 bg-white dark:bg-[#1b1917]'
+              }
+            >
+              {t(`Groups.${dateGroup}`)}
+            </div>
+            {groupActivities.map((activity: Activity) => {
+              const participant =
+                activity.participantId !== null
+                  ? participants.find((p) => p.id === activity.participantId)
+                  : undefined
+              const expense =
+                activity.expenseId !== null
+                  ? expenses.find((e) => e.id === activity.expenseId)
+                  : undefined
+              return (
+                <ActivityItem
+                  key={activity.id}
+                  {...{ groupId, activity, participant, expense, dateStyle }}
+                />
+              )
+            })}
+          </div>
+        )
+      })}
+    </>
+  ) : (
+    <p className="px-6 text-sm py-6">{t('noActivity')}</p>
+  )
+}

src/app/groups/[groupId]/activity/page.tsx

@@ -0,0 +1,51 @@
+import { cached } from '@/app/cached-functions'
+import { ActivityList } from '@/app/groups/[groupId]/activity/activity-list'
+import {
+  Card,
+  CardContent,
+  CardDescription,
+  CardHeader,
+  CardTitle,
+} from '@/components/ui/card'
+import { getActivities, getGroupExpenses } from '@/lib/api'
+import { Metadata } from 'next'
+import { getTranslations } from 'next-intl/server'
+import { notFound } from 'next/navigation'
+
+export const metadata: Metadata = {
+  title: 'Activity',
+}
+
+export default async function ActivityPage({
+  params: { groupId },
+}: {
+  params: { groupId: string }
+}) {
+  const t = await getTranslations('Activity')
+  const group = await cached.getGroup(groupId)
+  if (!group) notFound()
+
+  const expenses = await getGroupExpenses(groupId)
+  const activities = await getActivities(groupId)
+
+  return (
+    <>
+      <Card className="mb-4">
+        <CardHeader>
+          <CardTitle>{t('title')}</CardTitle>
+          <CardDescription>{t('description')}</CardDescription>
+        </CardHeader>
+        <CardContent className="flex flex-col space-y-4">
+          <ActivityList
+            {...{
+              groupId,
+              participants: group.participants,
+              expenses,
+              activities,
+            }}
+          />
+        </CardContent>
+      </Card>
+    </>
+  )
+}

src/app/groups/[groupId]/balances-list.tsx

@@ -1,6 +1,7 @@
 import { Balances } from '@/lib/balances'
 import { cn, formatCurrency } from '@/lib/utils'
 import { Participant } from '@prisma/client'
+import { useLocale } from 'next-intl'
 
 type Props = {
   balances: Balances
@@ -9,6 +10,7 @@ type Props = {
 }
 
 export function BalancesList({ balances, participants, currency }: Props) {
+  const locale = useLocale()
   const maxBalance = Math.max(
     ...Object.values(balances).map((b) => Math.abs(b.total)),
   )
@@ -28,7 +30,7 @@ export function BalancesList({ balances, participants, currency }: Props) {
             </div>
             <div className={cn('w-1/2 relative', isLeft || 'text-right')}>
               <div className="absolute inset-0 p-2 z-20">
-                {formatCurrency(currency, balance)}
+                {formatCurrency(currency, balance, locale)}
               </div>
               {balance !== 0 && (
                 <div

src/app/groups/[groupId]/balances/page.tsx

@@ -15,6 +15,7 @@ import {
   getSuggestedReimbursements,
 } from '@/lib/balances'
 import { Metadata } from 'next'
+import { getTranslations } from 'next-intl/server'
 import { notFound } from 'next/navigation'
 
 export const metadata: Metadata = {
@@ -26,6 +27,7 @@ export default async function GroupPage({
 }: {
   params: { groupId: string }
 }) {
+  const t = await getTranslations('Balances')
   const group = await cached.getGroup(groupId)
   if (!group) notFound()
 
@@ -38,10 +40,8 @@ export default async function GroupPage({
     <>
       <Card className="mb-4">
         <CardHeader>
-          <CardTitle>Balances</CardTitle>
-          <CardDescription>
-            This is the amount that each participant paid or was paid for.
-          </CardDescription>
+          <CardTitle>{t('title')}</CardTitle>
+          <CardDescription>{t('description')}</CardDescription>
         </CardHeader>
         <CardContent>
           <BalancesList
@@ -53,11 +53,8 @@ export default async function GroupPage({
       </Card>
       <Card className="mb-4">
         <CardHeader>
-          <CardTitle>Suggested reimbursements</CardTitle>
-          <CardDescription>
-            Here are suggestions for optimized reimbursements between
-            participants.
-          </CardDescription>
+          <CardTitle>{t('Reimbursements.title')}</CardTitle>
+          <CardDescription>{t('Reimbursements.description')}</CardDescription>
         </CardHeader>
         <CardContent className="p-0">
           <ReimbursementList

src/app/groups/[groupId]/edit/page.tsx

@@ -17,10 +17,10 @@ export default async function EditGroupPage({
   const group = await cached.getGroup(groupId)
   if (!group) notFound()
 
-  async function updateGroupAction(values: unknown) {
+  async function updateGroupAction(values: unknown, participantId?: string) {
     'use server'
     const groupFormValues = groupFormSchema.parse(values)
-    const group = await updateGroup(groupId, groupFormValues)
+    const group = await updateGroup(groupId, groupFormValues, participantId)
     redirect(`/groups/${group.id}`)
   }
 

src/app/groups/[groupId]/expenses/[expenseId]/edit/page.tsx

@@ -6,6 +6,7 @@ import {
   getExpense,
   updateExpense,
 } from '@/lib/api'
+import { getRuntimeFeatureFlags } from '@/lib/featureFlags'
 import { expenseFormSchema } from '@/lib/schemas'
 import { Metadata } from 'next'
 import { notFound, redirect } from 'next/navigation'
@@ -26,16 +27,16 @@ export default async function EditExpensePage({
   const expense = await getExpense(groupId, expenseId)
   if (!expense) notFound()
 
-  async function updateExpenseAction(values: unknown) {
+  async function updateExpenseAction(values: unknown, participantId?: string) {
     'use server'
     const expenseFormValues = expenseFormSchema.parse(values)
-    await updateExpense(groupId, expenseId, expenseFormValues)
+    await updateExpense(groupId, expenseId, expenseFormValues, participantId)
     redirect(`/groups/${groupId}`)
   }
 
-  async function deleteExpenseAction() {
+  async function deleteExpenseAction(participantId?: string) {
     'use server'
-    await deleteExpense(expenseId)
+    await deleteExpense(groupId, expenseId, participantId)
     redirect(`/groups/${groupId}`)
   }
 
@@ -47,6 +48,7 @@ export default async function EditExpensePage({
         categories={categories}
         onSubmit={updateExpenseAction}
         onDelete={deleteExpenseAction}
+        runtimeFeatureFlags={await getRuntimeFeatureFlags()}
       />
     </Suspense>
   )

src/app/groups/[groupId]/expenses/active-user-balance.tsx

@@ -0,0 +1,45 @@
+'use client'
+import { Money } from '@/components/money'
+import { getBalances } from '@/lib/balances'
+import { useActiveUser } from '@/lib/hooks'
+import { useTranslations } from 'next-intl'
+
+type Props = {
+  groupId: string
+  currency: string
+  expense: Parameters<typeof getBalances>[0][number]
+}
+
+export function ActiveUserBalance({ groupId, currency, expense }: Props) {
+  const t = useTranslations('ExpenseCard')
+  const activeUserId = useActiveUser(groupId)
+  if (activeUserId === null || activeUserId === '' || activeUserId === 'None') {
+    return null
+  }
+
+  const balances = getBalances([expense])
+  let fmtBalance = <>You are not involved</>
+  if (Object.hasOwn(balances, activeUserId)) {
+    const balance = balances[activeUserId]
+    let balanceDetail = <></>
+    if (balance.paid > 0 && balance.paidFor > 0) {
+      balanceDetail = (
+        <>
+          {' ('}
+          <Money {...{ currency, amount: balance.paid }} />
+          {' - '}
+          <Money {...{ currency, amount: balance.paidFor }} />
+          {')'}
+        </>
+      )
+    }
+    fmtBalance = (
+      <>
+        {t('yourBalance')}{' '}
+        <Money {...{ currency, amount: balance.total }} bold colored />
+        {balanceDetail}
+      </>
+    )
+  }
+  return <div className="text-xs text-muted-foreground">{fmtBalance}</div>
+}

src/app/groups/[groupId]/expenses/active-user-modal.tsx

@@ -12,7 +12,6 @@ import {
 import {
   Drawer,
   DrawerContent,
-  DrawerDescription,
   DrawerFooter,
   DrawerHeader,
   DrawerTitle,
@@ -22,6 +21,7 @@ import { RadioGroup, RadioGroupItem } from '@/components/ui/radio-group'
 import { getGroup } from '@/lib/api'
 import { useMediaQuery } from '@/lib/hooks'
 import { cn } from '@/lib/utils'
+import { useTranslations } from 'next-intl'
 import { ComponentProps, useEffect, useState } from 'react'
 
 type Props = {
@@ -29,6 +29,7 @@ type Props = {
 }
 
 export function ActiveUserModal({ group }: Props) {
+  const t = useTranslations('Expenses.ActiveUserModal')
   const [open, setOpen] = useState(false)
   const isDesktop = useMediaQuery('(min-width: 768px)')
 
@@ -52,16 +53,13 @@ export function ActiveUserModal({ group }: Props) {
       <Dialog open={open} onOpenChange={updateOpen}>
         <DialogContent className="sm:max-w-[425px]">
           <DialogHeader>
-            <DialogTitle>Who are you?</DialogTitle>
-            <DialogDescription>
-              Tell us which participant you are to let us customize how the
-              information is displayed.
-            </DialogDescription>
+            <DialogTitle>{t('title')}</DialogTitle>
+            <DialogDescription>{t('description')}</DialogDescription>
           </DialogHeader>
           <ActiveUserForm group={group} close={() => setOpen(false)} />
           <DialogFooter className="sm:justify-center">
             <p className="text-sm text-center text-muted-foreground">
-              This setting can be changed later in the group settings.
+              {t('footer')}
             </p>
           </DialogFooter>
         </DialogContent>
@@ -73,11 +71,8 @@ export function ActiveUserModal({ group }: Props) {
     <Drawer open={open} onOpenChange={updateOpen}>
       <DrawerContent>
         <DrawerHeader className="text-left">
-          <DrawerTitle>Who are you?</DrawerTitle>
-          <DrawerDescription>
-            Tell us which participant you are to let us customize how the
-            information is displayed.
-          </DrawerDescription>
+          <DrawerTitle>{t('title')}</DrawerTitle>
+          <DialogDescription>{t('description')}</DialogDescription>
         </DrawerHeader>
         <ActiveUserForm
           className="px-4"
@@ -86,7 +81,7 @@ export function ActiveUserModal({ group }: Props) {
         />
         <DrawerFooter className="pt-2">
           <p className="text-sm text-center text-muted-foreground">
-            This setting can be changed later in the group settings.
+            {t('footer')}
           </p>
         </DrawerFooter>
       </DrawerContent>
@@ -99,6 +94,7 @@ function ActiveUserForm({
   close,
   className,
 }: ComponentProps<'form'> & { group: Props['group']; close: () => void }) {
+  const t = useTranslations('Expenses.ActiveUserModal')
   const [selected, setSelected] = useState('None')
 
   return (
@@ -115,7 +111,7 @@ function ActiveUserForm({
           <div className="flex items-center space-x-2">
             <RadioGroupItem value="none" id="none" />
             <Label htmlFor="none" className="italic font-normal flex-1">
-              I don’t want to select anyone
+              {t('nobody')}
             </Label>
           </div>
           {group.participants.map((participant) => (
@@ -128,7 +124,7 @@ function ActiveUserForm({
           ))}
         </div>
       </RadioGroup>
-      <Button type="submit">Save changes</Button>
+      <Button type="submit">{t('save')}</Button>
     </form>
   )
 }

src/app/groups/[groupId]/expenses/create-from-receipt-button.tsx

@@ -26,9 +26,10 @@ import {
 import { ToastAction } from '@/components/ui/toast'
 import { useToast } from '@/components/ui/use-toast'
 import { useMediaQuery } from '@/lib/hooks'
-import { formatCurrency, formatExpenseDate, formatFileSize } from '@/lib/utils'
+import { formatCurrency, formatDate, formatFileSize } from '@/lib/utils'
 import { Category } from '@prisma/client'
 import { ChevronRight, FileQuestion, Loader2, Receipt } from 'lucide-react'
+import { useLocale, useTranslations } from 'next-intl'
 import { getImageData, usePresignedUpload } from 'next-s3-upload'
 import Image from 'next/image'
 import { useRouter } from 'next/navigation'
@@ -47,6 +48,8 @@ export function CreateFromReceiptButton({
   groupCurrency,
   categories,
 }: Props) {
+  const locale = useLocale()
+  const t = useTranslations('CreateFromReceipt')
   const [pending, setPending] = useState(false)
   const { uploadToS3, FileInput, openFileDialog } = usePresignedUpload()
   const { toast } = useToast()
@@ -60,10 +63,11 @@ export function CreateFromReceiptButton({
   const handleFileChange = async (file: File) => {
     if (file.size > MAX_FILE_SIZE) {
       toast({
-        title: 'The file is too big',
-        description: `The maximum file size you can upload is ${formatFileSize(
-          MAX_FILE_SIZE,
-        )}. Yours is ${formatFileSize(file.size)}.`,
+        title: t('TooBigToast.title'),
+        description: t('TooBigToast.description', {
+          maxSize: formatFileSize(MAX_FILE_SIZE, locale),
+          size: formatFileSize(file.size, locale),
+        }),
         variant: 'destructive',
       })
       return
@@ -82,13 +86,15 @@ export function CreateFromReceiptButton({
       } catch (err) {
         console.error(err)
         toast({
-          title: 'Error while uploading document',
-          description:
-            'Something wrong happened when uploading the document. Please retry later or select a different file.',
+          title: t('ErrorToast.title'),
+          description: t('ErrorToast.description'),
           variant: 'destructive',
           action: (
-            <ToastAction altText="Retry" onClick={() => upload()}>
-              Retry
+            <ToastAction
+              altText={t('ErrorToast.retry')}
+              onClick={() => upload()}
+            >
+              {t('ErrorToast.retry')}
             </ToastAction>
           ),
         })
@@ -114,26 +120,23 @@ export function CreateFromReceiptButton({
         <Button
           size="icon"
           variant="secondary"
-          title="Create expense from receipt"
+          title={t('Dialog.triggerTitle')}
         >
           <Receipt className="w-4 h-4" />
         </Button>
       }
       title={
         <>
-          <span>Create from receipt</span>
+          <span>{t('Dialog.title')}</span>
           <Badge className="bg-pink-700 hover:bg-pink-600 dark:bg-pink-500 dark:hover:bg-pink-600">
             Beta
           </Badge>
         </>
       }
-      description={<>Extract the expense information from a receipt photo.</>}
+      description={<>{t('Dialog.description')}</>}
     >
       <div className="prose prose-sm dark:prose-invert">
-        <p>
-          Upload the photo of a receipt, and we’ll scan it to extract the
-          expense information if we can.
-        </p>
+        <p>{t('Dialog.body')}</p>
         <div>
           <FileInput
             onChange={handleFileChange}
@@ -161,16 +164,16 @@ export function CreateFromReceiptButton({
                 </div>
               ) : (
                 <span className="text-xs sm:text-sm text-muted-foreground">
-                  Select image…
+                  {t('Dialog.selectImage')}
                 </span>
               )}
             </Button>
             <div className="col-span-2">
-              <strong>Title:</strong>
+              <strong>{t('Dialog.titleLabel')}</strong>
               <div>{receiptInfo ? receiptInfo.title ?? <Unknown /> : '…'}</div>
             </div>
             <div className="col-span-2">
-              <strong>Category:</strong>
+              <strong>{t('Dialog.categoryLabel')}</strong>
               <div>
                 {receiptInfo ? (
                   receiptInfoCategory ? (
@@ -194,11 +197,17 @@ export function CreateFromReceiptButton({
               </div>
             </div>
             <div>
-              <strong>Amount:</strong>
+              <strong>{t('Dialog.amountLabel')}</strong>
               <div>
                 {receiptInfo ? (
                   receiptInfo.amount ? (
-                    <>{formatCurrency(groupCurrency, receiptInfo.amount)}</>
+                    <>
+                      {formatCurrency(
+                        groupCurrency,
+                        receiptInfo.amount,
+                        locale,
+                      )}
+                    </>
                   ) : (
                     <Unknown />
                   )
@@ -208,12 +217,14 @@ export function CreateFromReceiptButton({
               </div>
             </div>
             <div>
-              <strong>Date:</strong>
+              <strong>{t('Dialog.dateLabel')}</strong>
               <div>
                 {receiptInfo ? (
                   receiptInfo.date ? (
-                    formatExpenseDate(
+                    formatDate(
                       new Date(`${receiptInfo?.date}T12:00:00.000Z`),
+                      locale,
+                      { dateStyle: 'medium' },
                     )
                   ) : (
                     <Unknown />
@@ -225,7 +236,7 @@ export function CreateFromReceiptButton({
             </div>
           </div>
         </div>
-        <p>You’ll be able to edit the expense information next.</p>
+        <p>{t('Dialog.editNext')}</p>
         <div className="text-center">
           <Button
             disabled={pending || !receiptInfo}
@@ -244,7 +255,7 @@ export function CreateFromReceiptButton({
               )
             }}
           >
-            Continue
+            {t('Dialog.continue')}
           </Button>
         </div>
       </div>
@@ -253,10 +264,11 @@ export function CreateFromReceiptButton({
 }
 
 function Unknown() {
+  const t = useTranslations('CreateFromReceipt')
   return (
     <div className="flex gap-1 items-center text-muted-foreground">
       <FileQuestion className="w-4 h-4" />
-      <em>Unknown</em>
+      <em>{t('unknown')}</em>
     </div>
   )
 }

src/app/groups/[groupId]/expenses/create/page.tsx

@@ -1,6 +1,7 @@
 import { cached } from '@/app/cached-functions'
 import { ExpenseForm } from '@/components/expense-form'
 import { createExpense, getCategories } from '@/lib/api'
+import { getRuntimeFeatureFlags } from '@/lib/featureFlags'
 import { expenseFormSchema } from '@/lib/schemas'
 import { Metadata } from 'next'
 import { notFound, redirect } from 'next/navigation'
@@ -19,10 +20,10 @@ export default async function ExpensePage({
   const group = await cached.getGroup(groupId)
   if (!group) notFound()
 
-  async function createExpenseAction(values: unknown) {
+  async function createExpenseAction(values: unknown, participantId?: string) {
     'use server'
     const expenseFormValues = expenseFormSchema.parse(values)
-    await createExpense(expenseFormValues, groupId)
+    await createExpense(expenseFormValues, groupId, participantId)
     redirect(`/groups/${groupId}`)
   }
 
@@ -32,6 +33,7 @@ export default async function ExpensePage({
         group={group}
         categories={categories}
         onSubmit={createExpenseAction}
+        runtimeFeatureFlags={await getRuntimeFeatureFlags()}
       />
     </Suspense>
   )

src/app/groups/[groupId]/expenses/expense-card.tsx

@@ -0,0 +1,94 @@
+'use client'
+import { ActiveUserBalance } from '@/app/groups/[groupId]/expenses/active-user-balance'
+import { CategoryIcon } from '@/app/groups/[groupId]/expenses/category-icon'
+import { Button } from '@/components/ui/button'
+import { getGroupExpenses } from '@/lib/api'
+import { cn, formatCurrency, formatDate } from '@/lib/utils'
+import { ChevronRight } from 'lucide-react'
+import { useLocale, useTranslations } from 'next-intl'
+import Link from 'next/link'
+import { useRouter } from 'next/navigation'
+import { Fragment } from 'react'
+
+type Expense = Awaited<ReturnType<typeof getGroupExpenses>>[number]
+
+function Participants({ expense }: { expense: Expense }) {
+  const t = useTranslations('ExpenseCard')
+  const key = expense.amount > 0 ? 'paidBy' : 'receivedBy'
+  const paidFor = expense.paidFor.map((paidFor, index) => (
+    <Fragment key={index}>
+      {index !== 0 && <>, </>}
+      <strong>{paidFor.participant.name}</strong>
+    </Fragment>
+  ))
+  const participants = t.rich(key, {
+    strong: (chunks) => <strong>{chunks}</strong>,
+    paidBy: expense.paidBy.name,
+    paidFor: () => paidFor,
+    forCount: expense.paidFor.length,
+  })
+  return <>{participants}</>
+}
+
+type Props = {
+  expense: Expense
+  currency: string
+  groupId: string
+}
+
+export function ExpenseCard({ expense, currency, groupId }: Props) {
+  const router = useRouter()
+  const locale = useLocale()
+
+  return (
+    <div
+      key={expense.id}
+      className={cn(
+        'flex justify-between sm:mx-6 px-4 sm:rounded-lg sm:pr-2 sm:pl-4 py-4 text-sm cursor-pointer hover:bg-accent gap-1 items-stretch',
+        expense.isReimbursement && 'italic',
+      )}
+      onClick={() => {
+        router.push(`/groups/${groupId}/expenses/${expense.id}/edit`)
+      }}
+    >
+      <CategoryIcon
+        category={expense.category}
+        className="w-4 h-4 mr-2 mt-0.5 text-muted-foreground"
+      />
+      <div className="flex-1">
+        <div className={cn('mb-1', expense.isReimbursement && 'italic')}>
+          {expense.title}
+        </div>
+        <div className="text-xs text-muted-foreground">
+          <Participants expense={expense} />
+        </div>
+        <div className="text-xs text-muted-foreground">
+          <ActiveUserBalance {...{ groupId, currency, expense }} />
+        </div>
+      </div>
+      <div className="flex flex-col justify-between items-end">
+        <div
+          className={cn(
+            'tabular-nums whitespace-nowrap',
+            expense.isReimbursement ? 'italic' : 'font-bold',
+          )}
+        >
+          {formatCurrency(currency, expense.amount, locale)}
+        </div>
+        <div className="text-xs text-muted-foreground">
+          {formatDate(expense.expenseDate, locale, { dateStyle: 'medium' })}
+        </div>
+      </div>
+      <Button
+        size="icon"
+        variant="link"
+        className="self-center hidden sm:flex"
+        asChild
+      >
+        <Link href={`/groups/${groupId}/expenses/${expense.id}/edit`}>
+          <ChevronRight className="w-4 h-4" />
+        </Link>
+      </Button>
+    </div>
+  )
+}

src/app/groups/[groupId]/expenses/expense-list-fetch-action.ts

@@ -0,0 +1,16 @@
+'use server'
+
+import { getGroupExpenses } from '@/lib/api'
+
+export async function getGroupExpensesAction(
+  groupId: string,
+  options?: { offset: number; length: number },
+) {
+  'use server'
+
+  try {
+    return getGroupExpenses(groupId, options)
+  } catch {
+    return null
+  }
+}

src/app/groups/[groupId]/expenses/expense-list.tsx

@@ -1,34 +1,43 @@
 'use client'
-import { CategoryIcon } from '@/app/groups/[groupId]/expenses/category-icon'
+import { ExpenseCard } from '@/app/groups/[groupId]/expenses/expense-card'
+import { getGroupExpensesAction } from '@/app/groups/[groupId]/expenses/expense-list-fetch-action'
 import { Button } from '@/components/ui/button'
 import { SearchBar } from '@/components/ui/search-bar'
-import { getGroupExpenses } from '@/lib/api'
-import { cn, formatCurrency, formatExpenseDate } from '@/lib/utils'
-import { Expense, Participant } from '@prisma/client'
+import { Skeleton } from '@/components/ui/skeleton'
+import { normalizeString } from '@/lib/utils'
+import { Participant } from '@prisma/client'
 import dayjs, { type Dayjs } from 'dayjs'
-import { ChevronRight } from 'lucide-react'
+import { useTranslations } from 'next-intl'
 import Link from 'next/link'
-import { useRouter } from 'next/navigation'
-import { Fragment, useEffect, useState } from 'react'
+import { useEffect, useMemo, useState } from 'react'
+import { useInView } from 'react-intersection-observer'
+
+type ExpensesType = NonNullable<
+  Awaited<ReturnType<typeof getGroupExpensesAction>>
+>
 
 type Props = {
-  expenses: Awaited<ReturnType<typeof getGroupExpenses>>
+  expensesFirstPage: ExpensesType
+  expenseCount: number
   participants: Participant[]
   currency: string
   groupId: string
 }
 
 const EXPENSE_GROUPS = {
-  THIS_WEEK: 'This week',
-  EARLIER_THIS_MONTH: 'Earlier this month',
-  LAST_MONTH: 'Last month',
-  EARLIER_THIS_YEAR: 'Earlier this year',
-  LAST_YEAR: 'Last year',
-  OLDER: 'Older',
+  UPCOMING: 'upcoming',
+  THIS_WEEK: 'thisWeek',
+  EARLIER_THIS_MONTH: 'earlierThisMonth',
+  LAST_MONTH: 'lastMonth',
+  EARLIER_THIS_YEAR: 'earlierThisYear',
+  LAST_YEAR: 'lastYear',
+  OLDER: 'older',
 }
 
 function getExpenseGroup(date: Dayjs, today: Dayjs) {
-  if (today.isSame(date, 'week')) {
+  if (today.isBefore(date)) {
+    return EXPENSE_GROUPS.UPCOMING
+  } else if (today.isSame(date, 'week')) {
     return EXPENSE_GROUPS.THIS_WEEK
   } else if (today.isSame(date, 'month')) {
     return EXPENSE_GROUPS.EARLIER_THIS_MONTH
@@ -43,28 +52,33 @@ function getExpenseGroup(date: Dayjs, today: Dayjs) {
   }
 }
 
-function getGroupedExpensesByDate(
-  expenses: Awaited<ReturnType<typeof getGroupExpenses>>,
-) {
+function getGroupedExpensesByDate(expenses: ExpensesType) {
   const today = dayjs()
-  return expenses.reduce(
-    (result: { [key: string]: Expense[] }, expense: Expense) => {
-      const expenseGroup = getExpenseGroup(dayjs(expense.expenseDate), today)
-      result[expenseGroup] = result[expenseGroup] ?? []
-      result[expenseGroup].push(expense)
-      return result
-    },
-    {},
-  )
+  return expenses.reduce((result: { [key: string]: ExpensesType }, expense) => {
+    const expenseGroup = getExpenseGroup(dayjs(expense.expenseDate), today)
+    result[expenseGroup] = result[expenseGroup] ?? []
+    result[expenseGroup].push(expense)
+    return result
+  }, {})
 }
 
 export function ExpenseList({
-  expenses,
+  expensesFirstPage,
+  expenseCount,
   currency,
   participants,
   groupId,
 }: Props) {
+  const firstLen = expensesFirstPage.length
   const [searchText, setSearchText] = useState('')
+  const [dataIndex, setDataIndex] = useState(firstLen)
+  const [dataLen, setDataLen] = useState(firstLen)
+  const [hasMoreData, setHasMoreData] = useState(expenseCount > firstLen)
+  const [isFetching, setIsFetching] = useState(false)
+  const [expenses, setExpenses] = useState(expensesFirstPage)
+  const { ref, inView } = useInView()
+  const t = useTranslations('Expenses')
+
   useEffect(() => {
     const activeUser = localStorage.getItem('newGroup-activeUser')
     const newUser = localStorage.getItem(`${groupId}-newUser`)
@@ -84,19 +98,54 @@ export function ExpenseList({
     }
   }, [groupId, participants])
 
-  const getParticipant = (id: string) => participants.find((p) => p.id === id)
-  const router = useRouter()
+  useEffect(() => {
+    const fetchNextPage = async () => {
+      setIsFetching(true)
+
+      const newExpenses = await getGroupExpensesAction(groupId, {
+        offset: dataIndex,
+        length: dataLen,
+      })
+
+      if (newExpenses !== null) {
+        const exp = expenses.concat(newExpenses)
+        setExpenses(exp)
+        setHasMoreData(exp.length < expenseCount)
+        setDataIndex(dataIndex + dataLen)
+        setDataLen(Math.ceil(1.5 * dataLen))
+      }
+
+      setTimeout(() => setIsFetching(false), 500)
+    }
+
+    if (inView && hasMoreData && !isFetching) fetchNextPage()
+  }, [
+    dataIndex,
+    dataLen,
+    expenseCount,
+    expenses,
+    groupId,
+    hasMoreData,
+    inView,
+    isFetching,
+  ])
+
+  const groupedExpensesByDate = useMemo(
+    () => getGroupedExpensesByDate(expenses),
+    [expenses],
+  )
 
-  const groupedExpensesByDate = getGroupedExpensesByDate(expenses)
   return expenses.length > 0 ? (
     <>
-      <SearchBar onChange={(e) => setSearchText(e.target.value)} />
+      <SearchBar
+        onValueChange={(value) => setSearchText(normalizeString(value))}
+      />
       {Object.values(EXPENSE_GROUPS).map((expenseGroup: string) => {
         let groupExpenses = groupedExpensesByDate[expenseGroup]
         if (!groupExpenses) return null
 
         groupExpenses = groupExpenses.filter(({ title }) =>
-          title.toLowerCase().includes(searchText.toLowerCase()),
+          normalizeString(title).includes(searchText),
         )
 
         if (groupExpenses.length === 0) return null
@@ -108,82 +157,42 @@ export function ExpenseList({
                 'text-muted-foreground text-xs pl-4 sm:pl-6 py-1 font-semibold sticky top-16 bg-white dark:bg-[#1b1917]'
               }
             >
-              {expenseGroup}
+              {t(`Groups.${expenseGroup}`)}
             </div>
-            {groupExpenses.map((expense: any) => (
-              <div
+            {groupExpenses.map((expense) => (
+              <ExpenseCard
                 key={expense.id}
-                className={cn(
-                  'flex justify-between sm:mx-6 px-4 sm:rounded-lg sm:pr-2 sm:pl-4 py-4 text-sm cursor-pointer hover:bg-accent gap-1 items-stretch',
-                  expense.isReimbursement && 'italic',
-                )}
-                onClick={() => {
-                  router.push(`/groups/${groupId}/expenses/${expense.id}/edit`)
-                }}
-              >
-                <CategoryIcon
-                  category={expense.category}
-                  className="w-4 h-4 mr-2 mt-0.5 text-muted-foreground"
-                />
-                <div className="flex-1">
-                  <div
-                    className={cn('mb-1', expense.isReimbursement && 'italic')}
-                  >
-                    {expense.title}
-                  </div>
-                  <div className="text-xs text-muted-foreground">
-                    Paid by{' '}
-                    <strong>{getParticipant(expense.paidById)?.name}</strong>{' '}
-                    for{' '}
-                    {expense.paidFor.map((paidFor: any, index: number) => (
-                      <Fragment key={index}>
-                        {index !== 0 && <>, </>}
-                        <strong>
-                          {
-                            participants.find(
-                              (p) => p.id === paidFor.participantId,
-                            )?.name
-                          }
-                        </strong>
-                      </Fragment>
-                    ))}
-                  </div>
-                </div>
-                <div className="flex flex-col justify-between items-end">
-                  <div
-                    className={cn(
-                      'tabular-nums whitespace-nowrap',
-                      expense.isReimbursement ? 'italic' : 'font-bold',
-                    )}
-                  >
-                    {formatCurrency(currency, expense.amount)}
-                  </div>
-                  <div className="text-xs text-muted-foreground">
-                    {formatExpenseDate(expense.expenseDate)}
-                  </div>
-                </div>
-                <Button
-                  size="icon"
-                  variant="link"
-                  className="self-center hidden sm:flex"
-                  asChild
-                >
-                  <Link href={`/groups/${groupId}/expenses/${expense.id}/edit`}>
-                    <ChevronRight className="w-4 h-4" />
-                  </Link>
-                </Button>
-              </div>
+                expense={expense}
+                currency={currency}
+                groupId={groupId}
+              />
             ))}
           </div>
         )
       })}
+      {expenses.length < expenseCount &&
+        [0, 1, 2].map((i) => (
+          <div
+            key={i}
+            className="border-t flex justify-between items-center px-6 py-4 text-sm"
+            ref={i === 0 ? ref : undefined}
+          >
+            <div className="flex flex-col gap-2">
+              <Skeleton className="h-4 w-16 rounded-full" />
+              <Skeleton className="h-4 w-32 rounded-full" />
+            </div>
+            <div>
+              <Skeleton className="h-4 w-16 rounded-full" />
+            </div>
+          </div>
+        ))}
     </>
   ) : (
     <p className="px-6 text-sm py-6">
-      Your group doesn’t contain any expense yet.{' '}
+      {t('noExpenses')}{' '}
       <Button variant="link" asChild className="-m-4">
         <Link href={`/groups/${groupId}/expenses/create`}>
-          Create the first one
+          {t('createFirst')}
         </Link>
       </Button>
     </p>

src/app/groups/[groupId]/expenses/export/json/route.ts

@@ -1,4 +1,4 @@
-import { getPrisma } from '@/lib/prisma'
+import { prisma } from '@/lib/prisma'
 import contentDisposition from 'content-disposition'
 import { NextResponse } from 'next/server'
 
@@ -6,7 +6,6 @@ export async function GET(
   req: Request,
   { params: { groupId } }: { params: { groupId: string } },
 ) {
-  const prisma = await getPrisma()
   const group = await prisma.group.findUnique({
     where: { id: groupId },
     select: {

src/app/groups/[groupId]/expenses/page.tsx

@@ -11,10 +11,15 @@ import {
   CardTitle,
 } from '@/components/ui/card'
 import { Skeleton } from '@/components/ui/skeleton'
-import { getCategories, getGroupExpenses } from '@/lib/api'
+import {
+  getCategories,
+  getGroupExpenseCount,
+  getGroupExpenses,
+} from '@/lib/api'
 import { env } from '@/lib/env'
 import { Download, Plus } from 'lucide-react'
 import { Metadata } from 'next'
+import { getTranslations } from 'next-intl/server'
 import Link from 'next/link'
 import { notFound } from 'next/navigation'
 import { Suspense } from 'react'
@@ -30,6 +35,7 @@ export default async function GroupExpensesPage({
 }: {
   params: { groupId: string }
 }) {
+  const t = await getTranslations('Expenses')
   const group = await cached.getGroup(groupId)
   if (!group) notFound()
 
@@ -40,10 +46,8 @@ export default async function GroupExpensesPage({
       <Card className="mb-4 rounded-none -mx-4 border-x-0 sm:border-x sm:rounded-lg sm:mx-0">
         <div className="flex flex-1">
           <CardHeader className="flex-1 p-4 sm:p-6">
-            <CardTitle>Expenses</CardTitle>
-            <CardDescription>
-              Here are the expenses that you created for your group.
-            </CardDescription>
+            <CardTitle>{t('title')}</CardTitle>
+            <CardDescription>{t('description')}</CardDescription>
           </CardHeader>
           <CardHeader className="p-4 sm:p-6 flex flex-row space-y-0 gap-2">
             <Button variant="secondary" size="icon" asChild>
@@ -51,6 +55,7 @@ export default async function GroupExpensesPage({
                 prefetch={false}
                 href={`/groups/${groupId}/expenses/export/json`}
                 target="_blank"
+                title={t('exportJson')}
               >
                 <Download className="w-4 h-4" />
               </Link>
@@ -63,7 +68,10 @@ export default async function GroupExpensesPage({
               />
             )}
             <Button asChild size="icon">
-              <Link href={`/groups/${groupId}/expenses/create`}>
+              <Link
+                href={`/groups/${groupId}/expenses/create`}
+                title={t('create')}
+              >
                 <Plus className="w-4 h-4" />
               </Link>
             </Button>
@@ -87,7 +95,7 @@ export default async function GroupExpensesPage({
               </div>
             ))}
           >
-            <Expenses groupId={groupId} />
+            <Expenses group={group} />
           </Suspense>
         </CardContent>
       </Card>
@@ -97,14 +105,22 @@ export default async function GroupExpensesPage({
   )
 }
 
-async function Expenses({ groupId }: { groupId: string }) {
-  const group = await cached.getGroup(groupId)
-  if (!group) notFound()
-  const expenses = await getGroupExpenses(group.id)
+type Props = {
+  group: NonNullable<Awaited<ReturnType<typeof cached.getGroup>>>
+}
+
+async function Expenses({ group }: Props) {
+  const expenseCount = await getGroupExpenseCount(group.id)
+
+  const expenses = await getGroupExpenses(group.id, {
+    offset: 0,
+    length: 200,
+  })
 
   return (
     <ExpenseList
-      expenses={expenses}
+      expensesFirstPage={expenses}
+      expenseCount={expenseCount}
       groupId={group.id}
       currency={group.currency}
       participants={group.participants}

src/app/groups/[groupId]/group-tabs.tsx

@@ -1,5 +1,6 @@
 'use client'
 import { Tabs, TabsList, TabsTrigger } from '@/components/ui/tabs'
+import { useTranslations } from 'next-intl'
 import { usePathname, useRouter } from 'next/navigation'
 
 type Props = {
@@ -7,6 +8,7 @@ type Props = {
 }
 
 export function GroupTabs({ groupId }: Props) {
+  const t = useTranslations()
   const pathname = usePathname()
   const value =
     pathname.replace(/\/groups\/[^\/]+\/([^/]+).*/, '$1') || 'expenses'
@@ -15,15 +17,18 @@ export function GroupTabs({ groupId }: Props) {
   return (
     <Tabs
       value={value}
-      className="[&>*]:border"
+      className="[&>*]:border overflow-x-auto"
       onValueChange={(value) => {
         router.push(`/groups/${groupId}/${value}`)
       }}
     >
       <TabsList>
-        <TabsTrigger value="expenses">Expenses</TabsTrigger>
-        <TabsTrigger value="balances">Balances</TabsTrigger>
-        <TabsTrigger value="edit">Settings</TabsTrigger>
+        <TabsTrigger value="expenses">{t('Expenses.title')}</TabsTrigger>
+        <TabsTrigger value="balances">{t('Balances.title')}</TabsTrigger>
+        <TabsTrigger value="information">{t('Information.title')}</TabsTrigger>
+        <TabsTrigger value="stats">{t('Stats.title')}</TabsTrigger>
+        <TabsTrigger value="activity">{t('Activity.title')}</TabsTrigger>
+        <TabsTrigger value="edit">{t('Settings.title')}</TabsTrigger>
       </TabsList>
     </Tabs>
   )

src/app/groups/[groupId]/information/page.tsx

@@ -0,0 +1,54 @@
+import { cached } from '@/app/cached-functions'
+import { Button } from '@/components/ui/button'
+import {
+  Card,
+  CardContent,
+  CardDescription,
+  CardHeader,
+  CardTitle,
+} from '@/components/ui/card'
+import { Pencil } from 'lucide-react'
+import { Metadata } from 'next'
+import { getTranslations } from 'next-intl/server'
+import Link from 'next/link'
+import { notFound } from 'next/navigation'
+
+export const metadata: Metadata = {
+  title: 'Totals',
+}
+
+export default async function InformationPage({
+  params: { groupId },
+}: {
+  params: { groupId: string }
+}) {
+  const group = await cached.getGroup(groupId)
+  if (!group) notFound()
+
+  const t = await getTranslations('Information')
+
+  return (
+    <>
+      <Card className="mb-4">
+        <CardHeader>
+          <CardTitle className="flex justify-between">
+            <span>{t('title')}</span>
+            <Button size="icon" asChild className="-mb-12">
+              <Link href={`/groups/${groupId}/edit`}>
+                <Pencil className="w-4 h-4" />
+              </Link>
+            </Button>
+          </CardTitle>
+          <CardDescription className="mr-12">
+            {t('description')}
+          </CardDescription>
+        </CardHeader>
+        <CardContent className="prose prose-sm sm:prose-base max-w-full whitespace-break-spaces">
+          {group.information || (
+            <p className="text-muted-foreground italic">{t('empty')}</p>
+          )}
+        </CardContent>
+      </Card>
+    </>
+  )
+}

src/app/groups/[groupId]/layout.tsx

@@ -35,7 +35,7 @@ export default async function GroupLayout({
 
   return (
     <>
-      <div className="flex flex-col sm:flex-row justify-between sm:items-center gap-3">
+      <div className="flex flex-col justify-between gap-3">
         <h1 className="font-bold text-2xl">
           <Link href={`/groups/${groupId}`}>{group.name}</Link>
         </h1>

src/app/groups/[groupId]/reimbursement-list.tsx

@@ -2,6 +2,7 @@ import { Button } from '@/components/ui/button'
 import { Reimbursement } from '@/lib/balances'
 import { formatCurrency } from '@/lib/utils'
 import { Participant } from '@prisma/client'
+import { useLocale, useTranslations } from 'next-intl'
 import Link from 'next/link'
 
 type Props = {
@@ -17,12 +18,10 @@ export function ReimbursementList({
   currency,
   groupId,
 }: Props) {
+  const locale = useLocale()
+  const t = useTranslations('Balances.Reimbursements')
   if (reimbursements.length === 0) {
-    return (
-      <p className="px-6 text-sm pb-6">
-        It looks like your group doesn’t need any reimbursement 😁
-      </p>
-    )
+    return <p className="px-6 text-sm pb-6">{t('noImbursements')}</p>
   }
 
   const getParticipant = (id: string) => participants.find((p) => p.id === id)
@@ -32,18 +31,21 @@ export function ReimbursementList({
         <div className="border-t px-6 py-4 flex justify-between" key={index}>
           <div className="flex flex-col gap-1 items-start sm:flex-row sm:items-baseline sm:gap-4">
             <div>
-              <strong>{getParticipant(reimbursement.from)?.name}</strong> owes{' '}
-              <strong>{getParticipant(reimbursement.to)?.name}</strong>
+              {t.rich('owes', {
+                from: getParticipant(reimbursement.from)?.name,
+                to: getParticipant(reimbursement.to)?.name,
+                strong: (chunks) => <strong>{chunks}</strong>,
+              })}
             </div>
             <Button variant="link" asChild className="-mx-4 -my-3">
               <Link
                 href={`/groups/${groupId}/expenses/create?reimbursement=yes&from=${reimbursement.from}&to=${reimbursement.to}&amount=${reimbursement.amount}`}
               >
-                Mark as paid
+                {t('markAsPaid')}
               </Link>
             </Button>
           </div>
-          <div>{formatCurrency(currency, reimbursement.amount)}</div>
+          <div>{formatCurrency(currency, reimbursement.amount, locale)}</div>
         </div>
       ))}
     </div>

src/app/groups/[groupId]/share-button.tsx

@@ -11,27 +11,26 @@ import {
 import { useBaseUrl } from '@/lib/hooks'
 import { Group } from '@prisma/client'
 import { Share } from 'lucide-react'
+import { useTranslations } from 'next-intl'
 
 type Props = {
   group: Group
 }
 
 export function ShareButton({ group }: Props) {
+  const t = useTranslations('Share')
   const baseUrl = useBaseUrl()
   const url = baseUrl && `${baseUrl}/groups/${group.id}/expenses?ref=share`
 
   return (
     <Popover>
       <PopoverTrigger asChild>
-        <Button size="icon">
+        <Button title={t('title')} size="icon" className="flex-shrink-0">
           <Share className="w-4 h-4" />
         </Button>
       </PopoverTrigger>
       <PopoverContent align="end" className="[&_p]:text-sm flex flex-col gap-3">
-        <p>
-          For other participants to see the group and add expenses, share its
-          URL with them.
-        </p>
+        <p>{t('description')}</p>
         {url && (
           <div className="flex gap-2">
             <Input className="flex-1" defaultValue={url} readOnly />
@@ -43,8 +42,7 @@ export function ShareButton({ group }: Props) {
           </div>
         )}
         <p>
-          <strong>Warning!</strong> Every person with the group URL will be able
-          to see and edit expenses. Share with caution!
+          <strong>{t('warning')}</strong> {t('warningHelp')}
         </p>
       </PopoverContent>
     </Popover>

src/app/groups/[groupId]/stats/page.tsx

@@ -0,0 +1,49 @@
+import { cached } from '@/app/cached-functions'
+import { Totals } from '@/app/groups/[groupId]/stats/totals'
+import {
+  Card,
+  CardContent,
+  CardDescription,
+  CardHeader,
+  CardTitle,
+} from '@/components/ui/card'
+import { getGroupExpenses } from '@/lib/api'
+import { getTotalGroupSpending } from '@/lib/totals'
+import { Metadata } from 'next'
+import { getTranslations } from 'next-intl/server'
+import { notFound } from 'next/navigation'
+
+export const metadata: Metadata = {
+  title: 'Totals',
+}
+
+export default async function TotalsPage({
+  params: { groupId },
+}: {
+  params: { groupId: string }
+}) {
+  const t = await getTranslations('Stats')
+  const group = await cached.getGroup(groupId)
+  if (!group) notFound()
+
+  const expenses = await getGroupExpenses(groupId)
+  const totalGroupSpendings = getTotalGroupSpending(expenses)
+
+  return (
+    <>
+      <Card className="mb-4">
+        <CardHeader>
+          <CardTitle>{t('Totals.title')}</CardTitle>
+          <CardDescription>{t('Totals.description')}</CardDescription>
+        </CardHeader>
+        <CardContent className="flex flex-col space-y-4">
+          <Totals
+            group={group}
+            expenses={expenses}
+            totalGroupSpendings={totalGroupSpendings}
+          />
+        </CardContent>
+      </Card>
+    </>
+  )
+}

src/app/groups/[groupId]/stats/totals-group-spending.tsx

@@ -0,0 +1,21 @@
+import { formatCurrency } from '@/lib/utils'
+import { useLocale, useTranslations } from 'next-intl'
+
+type Props = {
+  totalGroupSpendings: number
+  currency: string
+}
+
+export function TotalsGroupSpending({ totalGroupSpendings, currency }: Props) {
+  const locale = useLocale()
+  const t = useTranslations('Stats.Totals')
+  const balance = totalGroupSpendings < 0 ? 'groupEarnings' : 'groupSpendings'
+  return (
+    <div>
+      <div className="text-muted-foreground">{t(balance)}</div>
+      <div className="text-lg">
+        {formatCurrency(currency, Math.abs(totalGroupSpendings), locale)}
+      </div>
+    </div>
+  )
+}

src/app/groups/[groupId]/stats/totals-your-share.tsx

@@ -0,0 +1,42 @@
+'use client'
+import { getGroup, getGroupExpenses } from '@/lib/api'
+import { getTotalActiveUserShare } from '@/lib/totals'
+import { cn, formatCurrency } from '@/lib/utils'
+import { useLocale, useTranslations } from 'next-intl'
+import { useEffect, useState } from 'react'
+
+type Props = {
+  group: NonNullable<Awaited<ReturnType<typeof getGroup>>>
+  expenses: NonNullable<Awaited<ReturnType<typeof getGroupExpenses>>>
+}
+
+export function TotalsYourShare({ group, expenses }: Props) {
+  const locale = useLocale()
+  const t = useTranslations('Stats.Totals')
+  const [activeUser, setActiveUser] = useState('')
+
+  useEffect(() => {
+    const activeUser = localStorage.getItem(`${group.id}-activeUser`)
+    if (activeUser) setActiveUser(activeUser)
+  }, [group, expenses])
+
+  const totalActiveUserShare =
+    activeUser === '' || activeUser === 'None'
+      ? 0
+      : getTotalActiveUserShare(activeUser, expenses)
+  const currency = group.currency
+
+  return (
+    <div>
+      <div className="text-muted-foreground">{t('yourShare')}</div>
+      <div
+        className={cn(
+          'text-lg',
+          totalActiveUserShare < 0 ? 'text-green-600' : 'text-red-600',
+        )}
+      >
+        {formatCurrency(currency, Math.abs(totalActiveUserShare), locale)}
+      </div>
+    </div>
+  )
+}

src/app/groups/[groupId]/stats/totals-your-spending.tsx

@@ -0,0 +1,39 @@
+'use client'
+import { getGroup, getGroupExpenses } from '@/lib/api'
+import { useActiveUser } from '@/lib/hooks'
+import { getTotalActiveUserPaidFor } from '@/lib/totals'
+import { cn, formatCurrency } from '@/lib/utils'
+import { useLocale, useTranslations } from 'next-intl'
+
+type Props = {
+  group: NonNullable<Awaited<ReturnType<typeof getGroup>>>
+  expenses: NonNullable<Awaited<ReturnType<typeof getGroupExpenses>>>
+}
+
+export function TotalsYourSpendings({ group, expenses }: Props) {
+  const locale = useLocale()
+  const t = useTranslations('Stats.Totals')
+  const activeUser = useActiveUser(group.id)
+
+  const totalYourSpendings =
+    activeUser === '' || activeUser === 'None'
+      ? 0
+      : getTotalActiveUserPaidFor(activeUser, expenses)
+  const currency = group.currency
+  const balance = totalYourSpendings < 0 ? 'yourEarnings' : 'yourSpendings'
+
+  return (
+    <div>
+      <div className="text-muted-foreground">{t(balance)}</div>
+
+      <div
+        className={cn(
+          'text-lg',
+          totalYourSpendings < 0 ? 'text-green-600' : 'text-red-600',
+        )}
+      >
+        {formatCurrency(currency, Math.abs(totalYourSpendings), locale)}
+      </div>
+    </div>
+  )
+}

src/app/groups/[groupId]/stats/totals.tsx

@@ -0,0 +1,34 @@
+'use client'
+import { TotalsGroupSpending } from '@/app/groups/[groupId]/stats/totals-group-spending'
+import { TotalsYourShare } from '@/app/groups/[groupId]/stats/totals-your-share'
+import { TotalsYourSpendings } from '@/app/groups/[groupId]/stats/totals-your-spending'
+import { getGroup, getGroupExpenses } from '@/lib/api'
+import { useActiveUser } from '@/lib/hooks'
+
+export function Totals({
+  group,
+  expenses,
+  totalGroupSpendings,
+}: {
+  group: NonNullable<Awaited<ReturnType<typeof getGroup>>>
+  expenses: NonNullable<Awaited<ReturnType<typeof getGroupExpenses>>>
+  totalGroupSpendings: number
+}) {
+  const activeUser = useActiveUser(group.id)
+  console.log('activeUser', activeUser)
+
+  return (
+    <>
+      <TotalsGroupSpending
+        totalGroupSpendings={totalGroupSpendings}
+        currency={group.currency}
+      />
+      {activeUser && activeUser !== 'None' && (
+        <>
+          <TotalsYourSpendings group={group} expenses={expenses} />
+          <TotalsYourShare group={group} expenses={expenses} />
+        </>
+      )}
+    </>
+  )
+}

src/app/groups/add-group-by-url-button.tsx

@@ -9,6 +9,7 @@ import {
 } from '@/components/ui/popover'
 import { useMediaQuery } from '@/lib/hooks'
 import { Loader2, Plus } from 'lucide-react'
+import { useTranslations } from 'next-intl'
 import { useState } from 'react'
 
 type Props = {
@@ -16,6 +17,7 @@ type Props = {
 }
 
 export function AddGroupByUrlButton({ reload }: Props) {
+  const t = useTranslations('Groups.AddByURL')
   const isDesktop = useMediaQuery('(min-width: 640px)')
   const [url, setUrl] = useState('')
   const [error, setError] = useState(false)
@@ -27,18 +29,15 @@ export function AddGroupByUrlButton({ reload }: Props) {
       <PopoverTrigger asChild>
         <Button variant="secondary">
           {/* <Plus className="w-4 h-4 mr-2" /> */}
-          <>Add by URL</>
+          {t('button')}
         </Button>
       </PopoverTrigger>
       <PopoverContent
         align={isDesktop ? 'end' : 'start'}
         className="[&_p]:text-sm flex flex-col gap-3"
       >
-        <h3 className="font-bold">Add a group by URL</h3>
-        <p>
-          If a group was shared with you, you can paste its URL here to add it
-          to your list.
-        </p>
+        <h3 className="font-bold">{t('title')}</h3>
+        <p>{t('description')}</p>
         <form
           className="flex gap-2"
           onSubmit={async (event) => {
@@ -80,11 +79,7 @@ export function AddGroupByUrlButton({ reload }: Props) {
             )}
           </Button>
         </form>
-        {error && (
-          <p className="text-destructive">
-            Oops, we are not able to find the group from the URL you provided…
-          </p>
-        )}
+        {error && <p className="text-destructive">{t('error')}</p>}
       </PopoverContent>
     </Popover>
   )

src/app/groups/not-found.tsx

@@ -1,13 +1,15 @@
 import { Button } from '@/components/ui/button'
+import { useTranslations } from 'next-intl'
 import Link from 'next/link'
 
 export default function NotFound() {
+  const t = useTranslations('Groups.NotFound')
   return (
     <div className="flex flex-col gap-2">
-      <p>This group does not exist.</p>
+      <p>{t('text')}</p>
       <p>
         <Button asChild variant="secondary">
-          <Link href="/groups">Go to recently visited groups</Link>
+          <Link href="/groups">{t('link')}</Link>
         </Button>
       </p>
     </div>

src/app/groups/recent-group-list-card.tsx

@@ -23,6 +23,7 @@ import { ToastAction } from '@/components/ui/toast'
 import { useToast } from '@/components/ui/use-toast'
 import { StarFilledIcon } from '@radix-ui/react-icons'
 import { Calendar, MoreHorizontal, Star, Users } from 'lucide-react'
+import { useLocale, useTranslations } from 'next-intl'
 import Link from 'next/link'
 import { useRouter } from 'next/navigation'
 import { SetStateAction } from 'react'
@@ -37,7 +38,9 @@ export function RecentGroupListCard({
   setState: (state: SetStateAction<RecentGroupsState>) => void
 }) {
   const router = useRouter()
+  const locale = useLocale()
   const toast = useToast()
+  const t = useTranslations('Groups')
 
   const details =
     state.status === 'complete'
@@ -118,12 +121,11 @@ export function RecentGroupListCard({
                           groups: state.groups.filter((g) => g.id !== group.id),
                         })
                         toast.toast({
-                          title: 'Group has been removed',
-                          description:
-                            'The group was removed from your recent groups list.',
+                          title: t('RecentRemovedToast.title'),
+                          description: t('RecentRemovedToast.description'),
                           action: (
                             <ToastAction
-                              altText="Undo group removal"
+                              altText={t('RecentRemovedToast.undoAlt')}
                               onClick={() => {
                                 saveRecentGroup(group)
                                 setState({
@@ -132,13 +134,13 @@ export function RecentGroupListCard({
                                 })
                               }}
                             >
-                              Undo
+                              {t('RecentRemovedToast.undo')}
                             </ToastAction>
                           ),
                         })
                       }}
                     >
-                      Remove from recent groups
+                      {t('removeRecent')}
                     </DropdownMenuItem>
                     <DropdownMenuItem
                       onClick={(event) => {
@@ -152,7 +154,7 @@ export function RecentGroupListCard({
                         refreshGroupsFromStorage()
                       }}
                     >
-                      {isArchived ? <>Unarchive group</> : <>Archive group</>}
+                      {t(isArchived ? 'unarchive' : 'archive')}
                     </DropdownMenuItem>
                   </DropdownMenuContent>
                 </DropdownMenu>
@@ -168,7 +170,7 @@ export function RecentGroupListCard({
                   <div className="flex items-center">
                     <Calendar className="w-3 h-3 inline mx-1" />
                     <span>
-                      {new Date(details.createdAt).toLocaleDateString('en-US', {
+                      {new Date(details.createdAt).toLocaleDateString(locale, {
                         dateStyle: 'medium',
                       })}
                     </span>

src/app/groups/recent-group-list.tsx

@@ -10,6 +10,7 @@ import {
 import { Button } from '@/components/ui/button'
 import { getGroups } from '@/lib/api'
 import { Loader2 } from 'lucide-react'
+import { useTranslations } from 'next-intl'
 import Link from 'next/link'
 import { PropsWithChildren, SetStateAction, useEffect, useState } from 'react'
 import { RecentGroupListCard } from './recent-group-list-card'
@@ -53,6 +54,7 @@ function sortGroups(
 }
 
 export function RecentGroupList() {
+  const t = useTranslations('Groups')
   const [state, setState] = useState<RecentGroupsState>({ status: 'pending' })
 
   function loadGroups() {
@@ -84,8 +86,8 @@ export function RecentGroupList() {
     return (
       <GroupsPage reload={loadGroups}>
         <p>
-          <Loader2 className="w-4 m-4 mr-2 inline animate-spin" /> Loading
-          recent groups…
+          <Loader2 className="w-4 m-4 mr-2 inline animate-spin" />{' '}
+          {t('loadingRecent')}
         </p>
       </GroupsPage>
     )
@@ -95,12 +97,12 @@ export function RecentGroupList() {
     return (
       <GroupsPage reload={loadGroups}>
         <div className="text-sm space-y-2">
-          <p>You have not visited any group recently.</p>
+          <p>{t('NoRecent.description')}</p>
           <p>
             <Button variant="link" asChild className="-m-4">
-              <Link href={`/groups/create`}>Create one</Link>
+              <Link href={`/groups/create`}>{t('NoRecent.create')}</Link>
             </Button>{' '}
-            or ask a friend to send you the link to an existing one.
+            {t('NoRecent.orAsk')}
           </p>
         </div>
       </GroupsPage>
@@ -113,7 +115,7 @@ export function RecentGroupList() {
     <GroupsPage reload={loadGroups}>
       {starredGroupInfo.length > 0 && (
         <>
-          <h2 className="mb-2">Starred groups</h2>
+          <h2 className="mb-2">{t('starred')}</h2>
           <GroupList
             groups={starredGroupInfo}
             state={state}
@@ -124,14 +126,14 @@ export function RecentGroupList() {
 
       {groupInfo.length > 0 && (
         <>
-          <h2 className="mt-6 mb-2">Recent groups</h2>
+          <h2 className="mt-6 mb-2">{t('recent')}</h2>
           <GroupList groups={groupInfo} state={state} setState={setState} />
         </>
       )}
 
       {archivedGroupInfo.length > 0 && (
         <>
-          <h2 className="mt-6 mb-2 opacity-50">Archived groups</h2>
+          <h2 className="mt-6 mb-2 opacity-50">{t('archived')}</h2>
           <div className="opacity-50">
             <GroupList
               groups={archivedGroupInfo}
@@ -172,18 +174,19 @@ function GroupsPage({
   children,
   reload,
 }: PropsWithChildren<{ reload: () => void }>) {
+  const t = useTranslations('Groups')
   return (
     <>
       <div className="flex flex-col sm:flex-row sm:items-center justify-between gap-2">
         <h1 className="font-bold text-2xl flex-1">
-          <Link href="/groups">My groups</Link>
+          <Link href="/groups">{t('myGroups')}</Link>
         </h1>
         <div className="flex gap-2">
           <AddGroupByUrlButton reload={reload} />
           <Button asChild>
             <Link href="/groups/create">
               {/* <Plus className="w-4 h-4 mr-2" /> */}
-              <>Create</>
+              {t('create')}
             </Link>
           </Button>
         </div>

src/app/groups/recent-groups-page.tsx

@@ -1,29 +0,0 @@
-'use client'
-import { AddGroupByUrlButton } from '@/app/groups/add-group-by-url-button'
-import { RecentGroupList } from '@/app/groups/recent-group-list'
-import { Button } from '@/components/ui/button'
-import Link from 'next/link'
-
-export function RecentGroupsPage() {
-  return (
-    <>
-      <div className="flex flex-col sm:flex-row sm:items-center justify-between gap-2">
-        <h1 className="font-bold text-2xl flex-1">
-          <Link href="/groups">My groups</Link>
-        </h1>
-        <div className="flex gap-2">
-          <AddGroupByUrlButton reload={() => {}} />
-          <Button asChild>
-            <Link href="/groups/create">
-              {/* <Plus className="w-4 h-4 mr-2" /> */}
-              <>Create</>
-            </Link>
-          </Button>
-        </div>
-      </div>
-      <div>
-        <RecentGroupList />
-      </div>
-    </>
-  )
-}

src/app/layout.tsx

@@ -1,4 +1,5 @@
 import { ApplePwaSplash } from '@/app/apple-pwa-splash'
+import { LocaleSwitcher } from '@/components/locale-switcher'
 import { ProgressBar } from '@/components/progress-bar'
 import { ThemeProvider } from '@/components/theme-provider'
 import { ThemeToggle } from '@/components/theme-toggle'
@@ -6,6 +7,8 @@ import { Button } from '@/components/ui/button'
 import { Toaster } from '@/components/ui/toaster'
 import { env } from '@/lib/env'
 import type { Metadata, Viewport } from 'next'
+import { NextIntlClientProvider, useTranslations } from 'next-intl'
+import { getLocale, getMessages } from 'next-intl/server'
 import Image from 'next/image'
 import Link from 'next/link'
 import { Suspense } from 'react'
@@ -59,93 +62,114 @@ export const viewport: Viewport = {
   themeColor: '#047857',
 }
 
-export default function RootLayout({
-  children,
-}: {
-  children: React.ReactNode
-}) {
+function Content({ children }: { children: React.ReactNode }) {
+  const t = useTranslations()
   return (
-    <html lang="en" suppressHydrationWarning>
-      <ApplePwaSplash icon="/logo-with-text.png" color="#027756" />
-      <body className="pt-16 min-h-[100dvh] flex flex-col items-stretch bg-slate-50 bg-opacity-30 dark:bg-background">
-        <ThemeProvider
-          attribute="class"
-          defaultTheme="system"
-          enableSystem
-          disableTransitionOnChange
+    <>
+      <header className="fixed top-0 left-0 right-0 h-16 flex justify-between bg-white dark:bg-gray-950 bg-opacity-50 dark:bg-opacity-50 p-2 border-b backdrop-blur-sm z-50">
+        <Link
+          className="flex items-center gap-2 hover:scale-105 transition-transform"
+          href="/"
         >
-          <Suspense>
-            <ProgressBar />
-          </Suspense>
-          <header className="fixed top-0 left-0 right-0 h-16 flex justify-between bg-white dark:bg-gray-950 bg-opacity-50 dark:bg-opacity-50 p-2 border-b backdrop-blur-sm z-50">
-            <Link
-              className="flex items-center gap-2 hover:scale-105 transition-transform"
-              href="/"
-            >
-              <h1>
-                <Image
-                  src="/logo-with-text.png"
-                  className="m-1 h-auto w-auto"
-                  width={(35 * 522) / 180}
-                  height={35}
-                  alt="Spliit"
-                />
-              </h1>
+          <h1>
+            <Image
+              src="/logo-with-text.png"
+              className="m-1 h-auto w-auto"
+              width={(35 * 522) / 180}
+              height={35}
+              alt="Spliit"
+            />
+          </h1>
+        </Link>
+        <div role="navigation" aria-label="Menu" className="flex">
+          <ul className="flex items-center text-sm">
+            <li>
+              <Button
+                variant="ghost"
+                size="sm"
+                asChild
+                className="-my-3 text-primary"
+              >
+                <Link href="/groups">{t('Header.groups')}</Link>
+              </Button>
+            </li>
+            <li>
+              <LocaleSwitcher />
+            </li>
+            <li>
+              <ThemeToggle />
+            </li>
+          </ul>
+        </div>
+      </header>
+
+      <div className="flex-1 flex flex-col">{children}</div>
+
+      <footer className="sm:p-8 md:p-16 sm:mt-16 sm:text-sm md:text-base md:mt-32 bg-slate-50 dark:bg-card border-t p-6 mt-8 flex flex-col sm:flex-row sm:justify-between gap-4 text-xs [&_a]:underline">
+        <div className="flex flex-col space-y-2">
+          <div className="sm:text-lg font-semibold text-base flex space-x-2 items-center">
+            <Link className="flex items-center gap-2" href="/">
+              <Image
+                src="/logo-with-text.png"
+                className="m-1 h-auto w-auto"
+                width={(35 * 522) / 180}
+                height={35}
+                alt="Spliit"
+              />
             </Link>
-            <div role="navigation" aria-label="Menu" className="flex">
-              <ul className="flex items-center text-sm">
-                <li>
-                  <Button
-                    variant="ghost"
-                    asChild
-                    className="-my-3 text-primary"
-                  >
-                    <Link href="/groups">Groups</Link>
-                  </Button>
-                </li>
-                <li>
-                  <ThemeToggle />
-                </li>
-              </ul>
-            </div>
-          </header>
-
-          <div className="flex-1 flex flex-col">{children}</div>
-
-          <footer className="sm:p-8 md:p-16 sm:mt-16 sm:text-sm md:text-base md:mt-32 bg-slate-50 dark:bg-card border-t p-6 mt-8 flex flex-col sm:flex-row sm:justify-between gap-4 text-xs [&_a]:underline">
-            <div className="flex flex-col space-y-2">
-              <div className="sm:text-lg font-semibold text-base flex space-x-2 items-center">
-                <Link className="flex items-center gap-2" href="/">
-                  <Image
-                    src="/logo-with-text.png"
-                    className="m-1 h-auto w-auto"
-                    width={(35 * 522) / 180}
-                    height={35}
-                    alt="Spliit"
-                  />
-                </Link>
-              </div>
-              <div className="flex flex-col space-y a--no-underline-text-white">
-                <span>Made in Montréal, Québec 🇨🇦</span>
-                <span>
-                  Built by{' '}
+          </div>
+          <div className="flex flex-col space-y a--no-underline-text-white">
+            <span>{t('Footer.madeIn')}</span>
+            <span>
+              {t.rich('Footer.builtBy', {
+                author: (txt) => (
                   <a href="https://scastiel.dev" target="_blank" rel="noopener">
-                    Sebastien Castiel
-                  </a>{' '}
-                  and{' '}
+                    {txt}
+                  </a>
+                ),
+                source: (txt) => (
                   <a
                     href="https://github.com/spliit-app/spliit/graphs/contributors"
                     target="_blank"
                     rel="noopener"
                   >
-                    contributors
+                    {txt}
                   </a>
-                </span>
-              </div>
-            </div>
-          </footer>
-          <Toaster />
-        </ThemeProvider>
+                ),
+              })}
+            </span>
+          </div>
+        </div>
+      </footer>
+      <Toaster />
+    </>
+  )
+}
+
+export default async function RootLayout({
+  children,
+}: {
+  children: React.ReactNode
+}) {
+  const locale = await getLocale()
+  const messages = await getMessages()
+  return (
+    <html lang={locale} suppressHydrationWarning>
+      <ApplePwaSplash icon="/logo-with-text.png" color="#027756" />
+      <body className="pt-16 min-h-[100dvh] flex flex-col items-stretch bg-slate-50 bg-opacity-30 dark:bg-background">
+        <NextIntlClientProvider messages={messages}>
+          <ThemeProvider
+            attribute="class"
+            defaultTheme="system"
+            enableSystem
+            disableTransitionOnChange
+          >
+            <Suspense>
+              <ProgressBar />
+            </Suspense>
+            <Content>{children}</Content>
+          </ThemeProvider>
+        </NextIntlClientProvider>
       </body>
     </html>
   )

src/components/category-selector.tsx

@@ -17,6 +17,7 @@ import {
 } from '@/components/ui/popover'
 import { useMediaQuery } from '@/lib/hooks'
 import { Category } from '@prisma/client'
+import { useTranslations } from 'next-intl'
 import { forwardRef, useEffect, useState } from 'react'
 
 type Props = {
@@ -100,6 +101,7 @@ function CategoryCommand({
   categories: Category[]
   onValueChange: (categoryId: Category['id']) => void
 }) {
+  const t = useTranslations('Categories')
   const categoriesByGroup = categories.reduce<Record<string, Category[]>>(
     (acc, category) => ({
       ...acc,
@@ -110,16 +112,18 @@ function CategoryCommand({
 
   return (
     <Command>
-      <CommandInput placeholder="Search category..." className="text-base" />
-      <CommandEmpty>No category found.</CommandEmpty>
+      <CommandInput placeholder={t('search')} className="text-base" />
+      <CommandEmpty>{t('noCategory')}</CommandEmpty>
       <div className="w-full max-h-[300px] overflow-y-auto">
         {Object.entries(categoriesByGroup).map(
           ([group, groupCategories], index) => (
-            <CommandGroup key={index} heading={group}>
+            <CommandGroup key={index} heading={t(`${group}.heading`)}>
               {groupCategories.map((category) => (
                 <CommandItem
                   key={category.id}
-                  value={`${category.id} ${category.grouping} ${category.name}`}
+                  value={`${category.id} ${t(
+                    `${category.grouping}.heading`,
+                  )} ${t(`${category.grouping}.${category.name}`)}`}
                   onSelect={(currentValue) => {
                     const id = Number(currentValue.split(' ')[0])
                     onValueChange(id)
@@ -169,10 +173,11 @@ const CategoryButton = forwardRef<HTMLButtonElement, CategoryButtonProps>(
 CategoryButton.displayName = 'CategoryButton'
 
 function CategoryLabel({ category }: { category: Category }) {
+  const t = useTranslations('Categories')
   return (
     <div className="flex items-center gap-3">
       <CategoryIcon category={category} className="w-4 h-4" />
-      {category.name}
+      {t(`${category.grouping}.${category.name}`)}
     </div>
   )
 }

src/components/delete-popup.tsx

@@ -0,0 +1,46 @@
+'use client'
+
+import { Trash2 } from 'lucide-react'
+import { useTranslations } from 'next-intl'
+import { AsyncButton } from './async-button'
+import { Button } from './ui/button'
+import {
+  Dialog,
+  DialogClose,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogTitle,
+  DialogTrigger,
+} from './ui/dialog'
+
+export function DeletePopup({ onDelete }: { onDelete: () => Promise<void> }) {
+  const t = useTranslations('ExpenseForm.DeletePopup')
+  return (
+    <Dialog>
+      <DialogTrigger asChild>
+        <Button variant="destructive">
+          <Trash2 className="w-4 h-4 mr-2" />
+          {t('label')}
+        </Button>
+      </DialogTrigger>
+      <DialogContent>
+        <DialogTitle>{t('title')}</DialogTitle>
+        <DialogDescription>{t('description')}</DialogDescription>
+        <DialogFooter className="flex flex-col gap-2">
+          <AsyncButton
+            type="button"
+            variant="destructive"
+            loadingContent="Deleting…"
+            action={onDelete}
+          >
+            {t('yes')}
+          </AsyncButton>
+          <DialogClose asChild>
+            <Button variant={'secondary'}>{t('cancel')}</Button>
+          </DialogClose>
+        </DialogFooter>
+      </DialogContent>
+    </Dialog>
+  )
+}

src/components/expense-documents-input.tsx

@@ -19,6 +19,7 @@ import { randomId } from '@/lib/api'
 import { ExpenseFormValues } from '@/lib/schemas'
 import { formatFileSize } from '@/lib/utils'
 import { Loader2, Plus, Trash, X } from 'lucide-react'
+import { useLocale, useTranslations } from 'next-intl'
 import { getImageData, usePresignedUpload } from 'next-s3-upload'
 import Image from 'next/image'
 import { useEffect, useState } from 'react'
@@ -31,6 +32,8 @@ type Props = {
 const MAX_FILE_SIZE = 5 * 1024 ** 2
 
 export function ExpenseDocumentsInput({ documents, updateDocuments }: Props) {
+  const locale = useLocale()
+  const t = useTranslations('ExpenseDocumentsInput')
   const [pending, setPending] = useState(false)
   const { FileInput, openFileDialog, uploadToS3 } = usePresignedUpload() // use presigned uploads to addtionally support providers other than AWS
   const { toast } = useToast()
@@ -38,10 +41,11 @@ export function ExpenseDocumentsInput({ documents, updateDocuments }: Props) {
   const handleFileChange = async (file: File) => {
     if (file.size > MAX_FILE_SIZE) {
       toast({
-        title: 'The file is too big',
-        description: `The maximum file size you can upload is ${formatFileSize(
-          MAX_FILE_SIZE,
-        )}. Yours is ${formatFileSize(file.size)}.`,
+        title: t('TooBigToast.title'),
+        description: t('TooBigToast.description', {
+          maxSize: formatFileSize(MAX_FILE_SIZE, locale),
+          size: formatFileSize(file.size, locale),
+        }),
         variant: 'destructive',
       })
       return
@@ -57,13 +61,15 @@ export function ExpenseDocumentsInput({ documents, updateDocuments }: Props) {
       } catch (err) {
         console.error(err)
         toast({
-          title: 'Error while uploading document',
-          description:
-            'Something wrong happened when uploading the document. Please retry later or select a different file.',
+          title: t('ErrorToast.title'),
+          description: t('ErrorToast.description'),
           variant: 'destructive',
           action: (
-            <ToastAction altText="Retry" onClick={() => upload()}>
-              Retry
+            <ToastAction
+              altText={t('ErrorToast.retry')}
+              onClick={() => upload()}
+            >
+              {t('ErrorToast.retry')}
             </ToastAction>
           ),
         })

src/components/expense-form.tsx

@@ -1,5 +1,4 @@
 'use client'
-import { AsyncButton } from '@/components/async-button'
 import { CategorySelector } from '@/components/category-selector'
 import { ExpenseDocumentsInput } from '@/components/expense-documents-input'
 import { SubmitButton } from '@/components/submit-button'
@@ -35,23 +34,114 @@ import {
   SelectValue,
 } from '@/components/ui/select'
 import { getCategories, getExpense, getGroup, randomId } from '@/lib/api'
-import { ExpenseFormValues, expenseFormSchema } from '@/lib/schemas'
+import { RuntimeFeatureFlags } from '@/lib/featureFlags'
+import { useActiveUser } from '@/lib/hooks'
+import {
+  ExpenseFormValues,
+  SplittingOptions,
+  expenseFormSchema,
+} from '@/lib/schemas'
 import { cn } from '@/lib/utils'
 import { zodResolver } from '@hookform/resolvers/zod'
-import { Save, Trash2 } from 'lucide-react'
+import { Save } from 'lucide-react'
+import { useTranslations } from 'next-intl'
 import Link from 'next/link'
 import { useSearchParams } from 'next/navigation'
-import { useState } from 'react'
+import { useEffect, useState } from 'react'
 import { useForm } from 'react-hook-form'
 import { match } from 'ts-pattern'
+import { DeletePopup } from './delete-popup'
 import { extractCategoryFromTitle } from './expense-form-actions'
+import { Textarea } from './ui/textarea'
 
 export type Props = {
   group: NonNullable<Awaited<ReturnType<typeof getGroup>>>
   expense?: NonNullable<Awaited<ReturnType<typeof getExpense>>>
   categories: NonNullable<Awaited<ReturnType<typeof getCategories>>>
-  onSubmit: (values: ExpenseFormValues) => Promise<void>
-  onDelete?: () => Promise<void>
+  onSubmit: (values: ExpenseFormValues, participantId?: string) => Promise<void>
+  onDelete?: (participantId?: string) => Promise<void>
+  runtimeFeatureFlags: RuntimeFeatureFlags
+}
+
+const enforceCurrencyPattern = (value: string) =>
+  value
+    .replace(/^\s*-/, '_') // replace leading minus with _
+    .replace(/[.,]/, '#') // replace first comma with #
+    .replace(/[-.,]/g, '') // remove other minus and commas characters
+    .replace(/_/, '-') // change back _ to minus
+    .replace(/#/, '.') // change back # to dot
+    .replace(/[^-\d.]/g, '') // remove all non-numeric characters
+
+const getDefaultSplittingOptions = (group: Props['group']) => {
+  const defaultValue = {
+    splitMode: 'EVENLY' as const,
+    paidFor: group.participants.map(({ id }) => ({
+      participant: id,
+      shares: '1' as unknown as number,
+    })),
+  }
+
+  if (typeof localStorage === 'undefined') return defaultValue
+  const defaultSplitMode = localStorage.getItem(
+    `${group.id}-defaultSplittingOptions`,
+  )
+  if (defaultSplitMode === null) return defaultValue
+  const parsedDefaultSplitMode = JSON.parse(
+    defaultSplitMode,
+  ) as SplittingOptions
+
+  if (parsedDefaultSplitMode.paidFor === null) {
+    parsedDefaultSplitMode.paidFor = defaultValue.paidFor
+  }
+
+  // if there is a participant in the default options that does not exist anymore,
+  // remove the stale default splitting options
+  for (const parsedPaidFor of parsedDefaultSplitMode.paidFor) {
+    if (
+      !group.participants.some(({ id }) => id === parsedPaidFor.participant)
+    ) {
+      localStorage.removeItem(`${group.id}-defaultSplittingOptions`)
+      return defaultValue
+    }
+  }
+
+  return {
+    splitMode: parsedDefaultSplitMode.splitMode,
+    paidFor: parsedDefaultSplitMode.paidFor.map((paidFor) => ({
+      participant: paidFor.participant,
+      shares: String(paidFor.shares / 100) as unknown as number,
+    })),
+  }
+}
+
+async function persistDefaultSplittingOptions(
+  groupId: string,
+  expenseFormValues: ExpenseFormValues,
+) {
+  if (localStorage && expenseFormValues.saveDefaultSplittingOptions) {
+    const computePaidFor = (): SplittingOptions['paidFor'] => {
+      if (expenseFormValues.splitMode === 'EVENLY') {
+        return expenseFormValues.paidFor.map(({ participant }) => ({
+          participant,
+          shares: '100' as unknown as number,
+        }))
+      } else if (expenseFormValues.splitMode === 'BY_AMOUNT') {
+        return null
+      } else {
+        return expenseFormValues.paidFor
+      }
+    }
+
+    const splittingOptions = {
+      splitMode: expenseFormValues.splitMode,
+      paidFor: computePaidFor(),
+    } satisfies SplittingOptions
+
+    localStorage.setItem(
+      `${groupId}-defaultSplittingOptions`,
+      JSON.stringify(splittingOptions),
+    )
+  }
 }
 
 export function ExpenseForm({
@@ -60,18 +150,21 @@ export function ExpenseForm({
   categories,
   onSubmit,
   onDelete,
+  runtimeFeatureFlags,
 }: Props) {
+  const t = useTranslations('ExpenseForm')
   const isCreate = expense === undefined
   const searchParams = useSearchParams()
   const getSelectedPayer = (field?: { value: string }) => {
     if (isCreate && typeof window !== 'undefined') {
       const activeUser = localStorage.getItem(`${group.id}-activeUser`)
-      if (activeUser && activeUser !== 'None') {
+      if (activeUser && activeUser !== 'None' && field?.value === undefined) {
         return activeUser
       }
     }
     return field?.value
   }
+  const defaultSplittingOptions = getDefaultSplittingOptions(group)
   const form = useForm<ExpenseFormValues>({
     resolver: zodResolver(expenseFormSchema),
     defaultValues: expense
@@ -86,8 +179,10 @@ export function ExpenseForm({
             shares: String(shares / 100) as unknown as number,
           })),
           splitMode: expense.splitMode,
+          saveDefaultSplittingOptions: false,
           isReimbursement: expense.isReimbursement,
           documents: expense.documents,
+          notes: expense.notes ?? '',
         }
       : searchParams.get('reimbursement')
       ? {
@@ -100,12 +195,17 @@ export function ExpenseForm({
           paidBy: searchParams.get('from') ?? undefined,
           paidFor: [
             searchParams.get('to')
-              ? { participant: searchParams.get('to')!, shares: 1 }
+              ? {
+                  participant: searchParams.get('to')!,
+                  shares: '1' as unknown as number,
+                }
               : undefined,
           ],
           isReimbursement: true,
-          splitMode: 'EVENLY',
+          splitMode: defaultSplittingOptions.splitMode,
+          saveDefaultSplittingOptions: false,
           documents: [],
+          notes: '',
         }
       : {
           title: searchParams.get('title') ?? '',
@@ -117,13 +217,11 @@ export function ExpenseForm({
             ? Number(searchParams.get('categoryId'))
             : 0, // category with Id 0 is General
           // paid for all, split evenly
-          paidFor: group.participants.map(({ id }) => ({
-            participant: id,
-            shares: 1,
-          })),
+          paidFor: defaultSplittingOptions.paidFor,
           paidBy: getSelectedPayer(),
           isReimbursement: false,
-          splitMode: 'EVENLY',
+          splitMode: defaultSplittingOptions.splitMode,
+          saveDefaultSplittingOptions: false,
           documents: searchParams.get('imageUrl')
             ? [
                 {
@@ -134,17 +232,97 @@ export function ExpenseForm({
                 },
               ]
             : [],
+          notes: '',
         },
   })
   const [isCategoryLoading, setCategoryLoading] = useState(false)
+  const activeUserId = useActiveUser(group.id)
+
+  const submit = async (values: ExpenseFormValues) => {
+    await persistDefaultSplittingOptions(group.id, values)
+    return onSubmit(values, activeUserId ?? undefined)
+  }
+
+  const [isIncome, setIsIncome] = useState(Number(form.getValues().amount) < 0)
+  const [manuallyEditedParticipants, setManuallyEditedParticipants] = useState<
+    Set<string>
+  >(new Set())
+
+  const sExpense = isIncome ? 'Income' : 'Expense'
+  const sPaid = isIncome ? 'received' : 'paid'
+
+  useEffect(() => {
+    setManuallyEditedParticipants(new Set())
+    const newPaidFor = defaultSplittingOptions.paidFor.map((participant) => ({
+      ...participant,
+      shares: String(participant.shares) as unknown as number,
+    }))
+    form.setValue('paidFor', newPaidFor, { shouldValidate: true })
+  }, [form.watch('splitMode'), form.watch('amount')])
+
+  useEffect(() => {
+    const totalAmount = Number(form.getValues().amount) || 0
+    const paidFor = form.getValues().paidFor
+    const splitMode = form.getValues().splitMode
+
+    let newPaidFor = [...paidFor]
+
+    if (
+      splitMode === 'EVENLY' ||
+      splitMode === 'BY_SHARES' ||
+      splitMode === 'BY_PERCENTAGE'
+    ) {
+      return
+    } else {
+      // Only auto-balance for split mode 'Unevenly - By amount'
+      const editedParticipants = Array.from(manuallyEditedParticipants)
+      let remainingAmount = totalAmount
+      let remainingParticipants = newPaidFor.length - editedParticipants.length
+
+      newPaidFor = newPaidFor.map((participant) => {
+        if (editedParticipants.includes(participant.participant)) {
+          const participantShare = Number(participant.shares) || 0
+          if (splitMode === 'BY_AMOUNT') {
+            remainingAmount -= participantShare
+          }
+          return participant
+        }
+        return participant
+      })
+
+      if (remainingParticipants > 0) {
+        let amountPerRemaining = 0
+        if (splitMode === 'BY_AMOUNT') {
+          amountPerRemaining = remainingAmount / remainingParticipants
+        }
+
+        newPaidFor = newPaidFor.map((participant) => {
+          if (!editedParticipants.includes(participant.participant)) {
+            return {
+              ...participant,
+              shares: String(
+                Number(amountPerRemaining.toFixed(2)),
+              ) as unknown as number,
+            }
+          }
+          return participant
+        })
+      }
+      form.setValue('paidFor', newPaidFor, { shouldValidate: true })
+    }
+  }, [
+    manuallyEditedParticipants,
+    form.watch('amount'),
+    form.watch('splitMode'),
+  ])
 
   return (
     <Form {...form}>
-      <form onSubmit={form.handleSubmit((values) => onSubmit(values))}>
+      <form onSubmit={form.handleSubmit(submit)}>
         <Card>
           <CardHeader>
             <CardTitle>
-              {isCreate ? <>Create expense</> : <>Edit expense</>}
+              {t(`${sExpense}.${isCreate ? 'create' : 'edit'}`)}
             </CardTitle>
           </CardHeader>
           <CardContent className="grid sm:grid-cols-2 gap-6">
@@ -153,15 +331,15 @@ export function ExpenseForm({
               name="title"
               render={({ field }) => (
                 <FormItem className="">
-                  <FormLabel>Expense title</FormLabel>
+                  <FormLabel>{t(`${sExpense}.TitleField.label`)}</FormLabel>
                   <FormControl>
                     <Input
-                      placeholder="Monday evening restaurant"
+                      placeholder={t(`${sExpense}.TitleField.placeholder`)}
                       className="text-base"
                       {...field}
                       onBlur={async () => {
                         field.onBlur() // avoid skipping other blur event listeners since we overwrite `field`
-                        if (process.env.NEXT_PUBLIC_ENABLE_CATEGORY_EXTRACT) {
+                        if (runtimeFeatureFlags.enableCategoryExtract) {
                           setCategoryLoading(true)
                           const { categoryId } = await extractCategoryFromTitle(
                             field.value,
@@ -173,7 +351,7 @@ export function ExpenseForm({
                     />
                   </FormControl>
                   <FormDescription>
-                    Enter a description for the expense.
+                    {t(`${sExpense}.TitleField.description`)}
                   </FormDescription>
                   <FormMessage />
                 </FormItem>
@@ -185,7 +363,7 @@ export function ExpenseForm({
               name="expenseDate"
               render={({ field }) => (
                 <FormItem className="sm:order-1">
-                  <FormLabel>Expense date</FormLabel>
+                  <FormLabel>{t(`${sExpense}.DateField.label`)}</FormLabel>
                   <FormControl>
                     <Input
                       className="date-base"
@@ -197,7 +375,7 @@ export function ExpenseForm({
                     />
                   </FormControl>
                   <FormDescription>
-                    Enter the date the expense was made.
+                    {t(`${sExpense}.DateField.description`)}
                   </FormDescription>
                   <FormMessage />
                 </FormItem>
@@ -207,41 +385,56 @@ export function ExpenseForm({
             <FormField
               control={form.control}
               name="amount"
-              render={({ field }) => (
+              render={({ field: { onChange, ...field } }) => (
                 <FormItem className="sm:order-3">
-                  <FormLabel>Amount</FormLabel>
+                  <FormLabel>{t('amountField.label')}</FormLabel>
                   <div className="flex items-baseline gap-2">
                     <span>{group.currency}</span>
                     <FormControl>
                       <Input
                         className="text-base max-w-[120px]"
-                        type="number"
+                        type="text"
                         inputMode="decimal"
-                        step={0.01}
                         placeholder="0.00"
+                        onChange={(event) => {
+                          const v = enforceCurrencyPattern(event.target.value)
+                          const income = Number(v) < 0
+                          setIsIncome(income)
+                          if (income) form.setValue('isReimbursement', false)
+                          onChange(v)
+                        }}
+                        onFocus={(e) => {
+                          // we're adding a small delay to get around safaris issue with onMouseUp deselecting things again
+                          const target = e.currentTarget
+                          setTimeout(() => target.select(), 1)
+                        }}
                         {...field}
                       />
                     </FormControl>
                   </div>
                   <FormMessage />
 
-                  <FormField
-                    control={form.control}
-                    name="isReimbursement"
-                    render={({ field }) => (
-                      <FormItem className="flex flex-row gap-2 items-center space-y-0 pt-2">
-                        <FormControl>
-                          <Checkbox
-                            checked={field.value}
-                            onCheckedChange={field.onChange}
-                          />
-                        </FormControl>
-                        <div>
-                          <FormLabel>This is a reimbursement</FormLabel>
-                        </div>
-                      </FormItem>
-                    )}
-                  />
+                  {!isIncome && (
+                    <FormField
+                      control={form.control}
+                      name="isReimbursement"
+                      render={({ field }) => (
+                        <FormItem className="flex flex-row gap-2 items-center space-y-0 pt-2">
+                          <FormControl>
+                            <Checkbox
+                              checked={field.value}
+                              onCheckedChange={field.onChange}
+                            />
+                          </FormControl>
+                          <div>
+                            <FormLabel>
+                              {t('isReimbursementField.label')}
+                            </FormLabel>
+                          </div>
+                        </FormItem>
+                      )}
+                    />
+                  )}
                 </FormItem>
               )}
             />
@@ -251,7 +444,7 @@ export function ExpenseForm({
               name="category"
               render={({ field }) => (
                 <FormItem className="order-3 sm:order-2">
-                  <FormLabel>Category</FormLabel>
+                  <FormLabel>{t('categoryField.label')}</FormLabel>
                   <CategorySelector
                     categories={categories}
                     defaultValue={
@@ -261,7 +454,7 @@ export function ExpenseForm({
                     isLoading={isCategoryLoading}
                   />
                   <FormDescription>
-                    Select the expense category.
+                    {t(`${sExpense}.categoryFieldDescription`)}
                   </FormDescription>
                   <FormMessage />
                 </FormItem>
@@ -273,7 +466,7 @@ export function ExpenseForm({
               name="paidBy"
               render={({ field }) => (
                 <FormItem className="sm:order-5">
-                  <FormLabel>Paid by</FormLabel>
+                  <FormLabel>{t(`${sExpense}.paidByField.label`)}</FormLabel>
                   <Select
                     onValueChange={field.onChange}
                     defaultValue={getSelectedPayer(field)}
@@ -290,19 +483,31 @@ export function ExpenseForm({
                     </SelectContent>
                   </Select>
                   <FormDescription>
-                    Select the participant who paid the expense.
+                    {t(`${sExpense}.paidByField.description`)}
                   </FormDescription>
                   <FormMessage />
                 </FormItem>
               )}
             />
+            <FormField
+              control={form.control}
+              name="notes"
+              render={({ field }) => (
+                <FormItem className="sm:order-6">
+                  <FormLabel>{t('notesField.label')}</FormLabel>
+                  <FormControl>
+                    <Textarea className="text-base" {...field} />
+                  </FormControl>
+                </FormItem>
+              )}
+            />
           </CardContent>
         </Card>
 
         <Card className="mt-4">
           <CardHeader>
             <CardTitle className="flex justify-between">
-              <span>Paid for</span>
+              <span>{t(`${sExpense}.paidFor.title`)}</span>
               <Button
                 variant="link"
                 type="button"
@@ -328,14 +533,14 @@ export function ExpenseForm({
               >
                 {form.getValues().paidFor.length ===
                 group.participants.length ? (
-                  <>Select none</>
+                  <>{t('selectNone')}</>
                 ) : (
-                  <>Select all</>
+                  <>{t('selectAll')}</>
                 )}
               </Button>
             </CardTitle>
             <CardDescription>
-              Select who the expense was paid for.
+              {t(`${sExpense}.paidFor.description`)}
             </CardDescription>
           </CardHeader>
           <CardContent>
@@ -400,7 +605,9 @@ export function ExpenseForm({
                                       })}
                                     >
                                       {match(form.getValues().splitMode)
-                                        .with('BY_SHARES', () => <>share(s)</>)
+                                        .with('BY_SHARES', () => (
+                                          <>{t('shares')}</>
+                                        ))
                                         .with('BY_PERCENTAGE', () => <>%</>)
                                         .with('BY_AMOUNT', () => (
                                           <>{group.currency}</>
@@ -424,7 +631,7 @@ export function ExpenseForm({
                                               ),
                                             )}
                                             className="text-base w-[80px] -my-2"
-                                            type="number"
+                                            type="text"
                                             disabled={
                                               !field.value?.some(
                                                 ({ participant }) =>
@@ -437,19 +644,24 @@ export function ExpenseForm({
                                                   participant === id,
                                               )?.shares
                                             }
-                                            onChange={(event) =>
+                                            onChange={(event) => {
                                               field.onChange(
                                                 field.value.map((p) =>
                                                   p.participant === id
                                                     ? {
                                                         participant: id,
                                                         shares:
-                                                          event.target.value,
+                                                          enforceCurrencyPattern(
+                                                            event.target.value,
+                                                          ),
                                                       }
                                                     : p,
                                                 ),
                                               )
-                                            }
+                                              setManuallyEditedParticipants(
+                                                (prev) => new Set(prev).add(id),
+                                              )
+                                            }}
                                             inputMode={
                                               form.getValues().splitMode ===
                                               'BY_AMOUNT'
@@ -487,10 +699,13 @@ export function ExpenseForm({
               )}
             />
 
-            <Collapsible className="mt-5">
+            <Collapsible
+              className="mt-5"
+              defaultOpen={form.getValues().splitMode !== 'EVENLY'}
+            >
               <CollapsibleTrigger asChild>
                 <Button variant="link" className="-mx-4">
-                  Advanced splitting options…
+                  {t('advancedOptions')}
                 </Button>
               </CollapsibleTrigger>
               <CollapsibleContent>
@@ -499,8 +714,8 @@ export function ExpenseForm({
                     control={form.control}
                     name="splitMode"
                     render={({ field }) => (
-                      <FormItem className="sm:order-2">
-                        <FormLabel>Split mode</FormLabel>
+                      <FormItem>
+                        <FormLabel>{t('SplitModeField.label')}</FormLabel>
                         <FormControl>
                           <Select
                             onValueChange={(value) => {
@@ -516,39 +731,60 @@ export function ExpenseForm({
                               <SelectValue />
                             </SelectTrigger>
                             <SelectContent>
-                              <SelectItem value="EVENLY">Evenly</SelectItem>
+                              <SelectItem value="EVENLY">
+                                {t('SplitModeField.evenly')}
+                              </SelectItem>
                               <SelectItem value="BY_SHARES">
-                                Unevenly – By shares
+                                {t('SplitModeField.byShares')}
                               </SelectItem>
                               <SelectItem value="BY_PERCENTAGE">
-                                Unevenly – By percentage
+                                {t('SplitModeField.byPercentage')}
                               </SelectItem>
                               <SelectItem value="BY_AMOUNT">
-                                Unevenly – By amount
+                                {t('SplitModeField.byAmount')}
                               </SelectItem>
                             </SelectContent>
                           </Select>
                         </FormControl>
                         <FormDescription>
-                          Select how to split the expense.
+                          {t(`${sExpense}.splitModeDescription`)}
                         </FormDescription>
                       </FormItem>
                     )}
                   />
+                  <FormField
+                    control={form.control}
+                    name="saveDefaultSplittingOptions"
+                    render={({ field }) => (
+                      <FormItem className="flex flex-row gap-2 items-center space-y-0 pt-2">
+                        <FormControl>
+                          <Checkbox
+                            checked={field.value}
+                            onCheckedChange={field.onChange}
+                          />
+                        </FormControl>
+                        <div>
+                          <FormLabel>
+                            {t('SplitModeField.saveAsDefault')}
+                          </FormLabel>
+                        </div>
+                      </FormItem>
+                    )}
+                  />
                 </div>
               </CollapsibleContent>
             </Collapsible>
           </CardContent>
         </Card>
 
-        {process.env.NEXT_PUBLIC_ENABLE_EXPENSE_DOCUMENTS && (
+        {runtimeFeatureFlags.enableExpenseDocuments && (
           <Card className="mt-4">
             <CardHeader>
               <CardTitle className="flex justify-between">
-                <span>Attach documents</span>
+                <span>{t('attachDocuments')}</span>
               </CardTitle>
               <CardDescription>
-                See and attach receipts to the expense.
+                {t(`${sExpense}.attachDescription`)}
               </CardDescription>
             </CardHeader>
             <CardContent>
@@ -567,25 +803,17 @@ export function ExpenseForm({
         )}
 
         <div className="flex mt-4 gap-2">
-          <SubmitButton
-            loadingContent={isCreate ? <>Creating…</> : <>Saving…</>}
-          >
+          <SubmitButton loadingContent={t(isCreate ? 'creating' : 'saving')}>
             <Save className="w-4 h-4 mr-2" />
-            {isCreate ? <>Create</> : <>Save</>}
+            {t(isCreate ? 'create' : 'save')}
           </SubmitButton>
           {!isCreate && onDelete && (
-            <AsyncButton
-              type="button"
-              variant="destructive"
-              loadingContent="Deleting…"
-              action={onDelete}
-            >
-              <Trash2 className="w-4 h-4 mr-2" />
-              Delete
-            </AsyncButton>
+            <DeletePopup
+              onDelete={() => onDelete(activeUserId ?? undefined)}
+            ></DeletePopup>
           )}
           <Button variant="ghost" asChild>
-            <Link href={`/groups/${group.id}`}>Cancel</Link>
+            <Link href={`/groups/${group.id}`}>{t('cancel')}</Link>
           </Button>
         </div>
       </form>

src/components/group-form.tsx

@@ -35,13 +35,18 @@ import { getGroup } from '@/lib/api'
 import { GroupFormValues, groupFormSchema } from '@/lib/schemas'
 import { zodResolver } from '@hookform/resolvers/zod'
 import { Save, Trash2 } from 'lucide-react'
+import { useTranslations } from 'next-intl'
 import Link from 'next/link'
 import { useEffect, useState } from 'react'
 import { useFieldArray, useForm } from 'react-hook-form'
+import { Textarea } from './ui/textarea'
 
 export type Props = {
   group?: NonNullable<Awaited<ReturnType<typeof getGroup>>>
-  onSubmit: (groupFormValues: GroupFormValues) => Promise<void>
+  onSubmit: (
+    groupFormValues: GroupFormValues,
+    participantId?: string,
+  ) => Promise<void>
   protectedParticipantIds?: string[]
 }
 
@@ -50,18 +55,25 @@ export function GroupForm({
   onSubmit,
   protectedParticipantIds = [],
 }: Props) {
+  const t = useTranslations('GroupForm')
   const form = useForm<GroupFormValues>({
     resolver: zodResolver(groupFormSchema),
     defaultValues: group
       ? {
           name: group.name,
+          information: group.information ?? '',
           currency: group.currency,
           participants: group.participants,
         }
       : {
           name: '',
+          information: '',
           currency: '',
-          participants: [{ name: 'John' }, { name: 'Jane' }, { name: 'Jack' }],
+          participants: [
+            { name: t('Participants.John') },
+            { name: t('Participants.Jane') },
+            { name: t('Participants.Jack') },
+          ],
         },
   })
   const { fields, append, remove } = useFieldArray({
@@ -76,10 +88,10 @@ export function GroupForm({
       const currentActiveUser =
         fields.find(
           (f) => f.id === localStorage.getItem(`${group?.id}-activeUser`),
-        )?.name || 'None'
+        )?.name || t('Settings.ActiveUserField.none')
       setActiveUser(currentActiveUser)
     }
-  }, [activeUser, fields, group?.id])
+  }, [t, activeUser, fields, group?.id])
 
   const updateActiveUser = () => {
     if (!activeUser) return
@@ -99,12 +111,16 @@ export function GroupForm({
     <Form {...form}>
       <form
         onSubmit={form.handleSubmit(async (values) => {
-          await onSubmit(values)
+          await onSubmit(
+            values,
+            group?.participants.find((p) => p.name === activeUser)?.id ??
+              undefined,
+          )
         })}
       >
         <Card className="mb-4">
           <CardHeader>
-            <CardTitle>Group information</CardTitle>
+            <CardTitle>{t('title')}</CardTitle>
           </CardHeader>
           <CardContent className="grid grid-cols-1 sm:grid-cols-2 gap-4">
             <FormField
@@ -112,16 +128,16 @@ export function GroupForm({
               name="name"
               render={({ field }) => (
                 <FormItem>
-                  <FormLabel>Group name</FormLabel>
+                  <FormLabel>{t('NameField.label')}</FormLabel>
                   <FormControl>
                     <Input
                       className="text-base"
-                      placeholder="Summer vacations"
+                      placeholder={t('NameField.placeholder')}
                       {...field}
                     />
                   </FormControl>
                   <FormDescription>
-                    Enter a name for your group.
+                    {t('NameField.description')}
                   </FormDescription>
                   <FormMessage />
                 </FormItem>
@@ -133,31 +149,50 @@ export function GroupForm({
               name="currency"
               render={({ field }) => (
                 <FormItem>
-                  <FormLabel>Currency symbol</FormLabel>
+                  <FormLabel>{t('CurrencyField.label')}</FormLabel>
                   <FormControl>
                     <Input
                       className="text-base"
-                      placeholder="$, €, £…"
+                      placeholder={t('CurrencyField.placeholder')}
                       max={5}
                       {...field}
                     />
                   </FormControl>
                   <FormDescription>
-                    We’ll use it to display amounts.
+                    {t('CurrencyField.description')}
                   </FormDescription>
                   <FormMessage />
                 </FormItem>
               )}
             />
+
+            <div className="col-span-2">
+              <FormField
+                control={form.control}
+                name="information"
+                render={({ field }) => (
+                  <FormItem>
+                    <FormLabel>{t('InformationField.label')}</FormLabel>
+                    <FormControl>
+                      <Textarea
+                        rows={10}
+                        className="text-base"
+                        {...field}
+                        placeholder={t('InformationField.placeholder')}
+                      />
+                    </FormControl>
+                    <FormMessage />
+                  </FormItem>
+                )}
+              />
+            </div>
           </CardContent>
         </Card>
 
         <Card className="mb-4">
           <CardHeader>
-            <CardTitle>Participants</CardTitle>
-            <CardDescription>
-              Enter the name for each participant
-            </CardDescription>
+            <CardTitle>{t('Participants.title')}</CardTitle>
+            <CardDescription>{t('Participants.description')}</CardDescription>
           </CardHeader>
           <CardContent>
             <ul className="flex flex-col gap-2">
@@ -173,7 +208,11 @@ export function GroupForm({
                         </FormLabel>
                         <FormControl>
                           <div className="flex gap-2">
-                            <Input className="text-base" {...field} />
+                            <Input
+                              className="text-base"
+                              {...field}
+                              placeholder={t('Participants.new')}
+                            />
                             {item.id &&
                             protectedParticipantIds.includes(item.id) ? (
                               <HoverCard>
@@ -192,8 +231,7 @@ export function GroupForm({
                                   align="end"
                                   className="text-sm"
                                 >
-                                  This participant is part of expenses, and can
-                                  not be removed.
+                                  {t('Participants.protectedParticipant')}
                                 </HoverCardContent>
                               </HoverCard>
                             ) : (
@@ -221,28 +259,25 @@ export function GroupForm({
             <Button
               variant="secondary"
               onClick={() => {
-                append({ name: 'New' })
+                append({ name: '' })
               }}
               type="button"
             >
-              Add participant
+              {t('Participants.add')}
             </Button>
           </CardFooter>
         </Card>
 
         <Card className="mb-4">
           <CardHeader>
-            <CardTitle>Local settings</CardTitle>
-            <CardDescription>
-              These settings are set per-device, and are used to customize your
-              experience.
-            </CardDescription>
+            <CardTitle>{t('Settings.title')}</CardTitle>
+            <CardDescription>{t('Settings.description')}</CardDescription>
           </CardHeader>
           <CardContent>
             <div className="grid sm:grid-cols-2 gap-4">
               {activeUser !== null && (
                 <FormItem>
-                  <FormLabel>Active user</FormLabel>
+                  <FormLabel>{t('Settings.ActiveUserField.label')}</FormLabel>
                   <FormControl>
                     <Select
                       onValueChange={(value) => {
@@ -251,10 +286,17 @@ export function GroupForm({
                       defaultValue={activeUser}
                     >
                       <SelectTrigger>
-                        <SelectValue placeholder="Select a participant" />
+                        <SelectValue
+                          placeholder={t(
+                            'Settings.ActiveUserField.placeholder',
+                          )}
+                        />
                       </SelectTrigger>
                       <SelectContent>
-                        {[{ name: 'None' }, ...form.watch('participants')]
+                        {[
+                          { name: t('Settings.ActiveUserField.none') },
+                          ...form.watch('participants'),
+                        ]
                           .filter((item) => item.name.length > 0)
                           .map(({ name }) => (
                             <SelectItem key={name} value={name}>
@@ -265,7 +307,7 @@ export function GroupForm({
                     </Select>
                   </FormControl>
                   <FormDescription>
-                    User used as default for paying expenses.
+                    {t('Settings.ActiveUserField.description')}
                   </FormDescription>
                 </FormItem>
               )}
@@ -275,14 +317,15 @@ export function GroupForm({
 
         <div className="flex mt-4 gap-2">
           <SubmitButton
-            loadingContent={group ? 'Saving…' : 'Creating…'}
+            loadingContent={t(group ? 'Settings.saving' : 'Settings.creating')}
             onClick={updateActiveUser}
           >
-            <Save className="w-4 h-4 mr-2" /> {group ? <>Save</> : <> Create</>}
+            <Save className="w-4 h-4 mr-2" />{' '}
+            {t(group ? 'Settings.save' : 'Settings.create')}
           </SubmitButton>
           {!group && (
             <Button variant="ghost" asChild>
-              <Link href="/groups">Cancel</Link>
+              <Link href="/groups">{t('Settings.cancel')}</Link>
             </Button>
           )}
         </div>

src/components/locale-switcher.tsx

@@ -0,0 +1,33 @@
+'use client'
+
+import { Button } from '@/components/ui/button'
+import {
+  DropdownMenu,
+  DropdownMenuContent,
+  DropdownMenuItem,
+  DropdownMenuTrigger,
+} from '@/components/ui/dropdown-menu'
+import { locales } from '@/i18n'
+import { setUserLocale } from '@/lib/locale'
+import { useLocale, useTranslations } from 'next-intl'
+
+export function LocaleSwitcher() {
+  const t = useTranslations('Locale')
+  const locale = useLocale()
+  return (
+    <DropdownMenu>
+      <DropdownMenuTrigger asChild>
+        <Button variant="ghost" size="sm" className="-my-3 text-primary">
+          <span>{t(locale)}</span>
+        </Button>
+      </DropdownMenuTrigger>
+      <DropdownMenuContent>
+        {locales.map((locale) => (
+          <DropdownMenuItem key={locale} onClick={() => setUserLocale(locale)}>
+            {t(locale)}
+          </DropdownMenuItem>
+        ))}
+      </DropdownMenuContent>
+    </DropdownMenu>
+  )
+}

src/components/money.tsx

@@ -0,0 +1,33 @@
+'use client'
+import { cn, formatCurrency } from '@/lib/utils'
+import { useLocale } from 'next-intl'
+
+type Props = {
+  currency: string
+  amount: number
+  bold?: boolean
+  colored?: boolean
+}
+
+export function Money({
+  currency,
+  amount,
+  bold = false,
+  colored = false,
+}: Props) {
+  const locale = useLocale()
+  return (
+    <span
+      className={cn(
+        colored && amount <= 1
+          ? 'text-red-600'
+          : colored && amount >= 1
+          ? 'text-green-600'
+          : '',
+        bold && 'font-bold',
+      )}
+    >
+      {formatCurrency(currency, amount, locale)}
+    </span>
+  )
+}

src/components/ui/form.tsx

@@ -12,6 +12,7 @@ import {
 
 import { cn } from "@/lib/utils"
 import { Label } from "@/components/ui/label"
+import { useMessages } from "next-intl"
 
 const Form = FormProvider
 
@@ -144,8 +145,18 @@ const FormMessage = React.forwardRef<
   HTMLParagraphElement,
   React.HTMLAttributes<HTMLParagraphElement>
 >(({ className, children, ...props }, ref) => {
+  const messages = useMessages()
   const { error, formMessageId } = useFormField()
-  const body = error ? String(error?.message) : children
+  let body
+  if (error) {
+    body = String(error?.message)
+    const translation = (messages.SchemaErrors as any)[body]
+    if (translation) {
+      body = translation
+    }
+  } else {
+    body = children
+  }
 
   if (!body) {
     return null

src/components/ui/search-bar.tsx

@@ -1,33 +1,51 @@
-import * as React from "react"
+import * as React from 'react'
 
-import {Input} from "@/components/ui/input";
-import {cn} from "@/lib/utils";
-import {
-  Search
-} from 'lucide-react'
+import { Input } from '@/components/ui/input'
+import { cn } from '@/lib/utils'
+import { useTranslations } from 'next-intl'
+import { Search, XCircle } from 'lucide-react'
 
 export interface InputProps
-  extends React.InputHTMLAttributes<HTMLInputElement> {}
+  extends React.InputHTMLAttributes<HTMLInputElement> {
+  onValueChange?: (value: string) => void
+}
 
 const SearchBar = React.forwardRef<HTMLInputElement, InputProps>(
-  ({ className, type, ...props }, ref) => {
+  ({ className, type, onValueChange, ...props }, ref) => {
+    const t = useTranslations('Expenses')
+    const [value, _setValue] = React.useState('')
+
+    const setValue = (v: string) => {
+      _setValue(v)
+      onValueChange && onValueChange(v)
+    }
+
     return (
       <div className="mx-4 sm:mx-6 flex relative">
         <Search className="absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 text-muted-foreground" />
         <Input
           type={type}
           className={cn(
-            "pl-10 text-sm focus:text-base bg-muted border-none text-muted-foreground",
-            className
+            'pl-10 text-sm focus:text-base bg-muted border-none text-muted-foreground',
+            className,
           )}
           ref={ref}
-          placeholder="Search for an expense…"
+          placeholder={t("searchPlaceholder")}
+          value={value}
+          onChange={(e) => setValue(e.target.value)}
           {...props}
         />
+        <XCircle
+          className={cn(
+            'absolute right-3 top-1/2 -translate-y-1/2 w-4 h-4 cursor-pointer',
+            !value && 'hidden',
+          )}
+          onClick={() => setValue('')}
+        />
       </div>
     )
-  }
+  },
 )
-SearchBar.displayName = "SearchBar"
+SearchBar.displayName = 'SearchBar'
 
 export { SearchBar }

src/i18n.ts

@@ -0,0 +1,16 @@
+import { getRequestConfig } from 'next-intl/server'
+import { getUserLocale } from './lib/locale'
+
+export const locales = ['en-US', 'fi'] as const
+export type Locale = (typeof locales)[number]
+export type Locales = ReadonlyArray<Locale>
+export const defaultLocale: Locale = 'en-US'
+
+export default getRequestConfig(async () => {
+  const locale = await getUserLocale()
+
+  return {
+    locale,
+    messages: (await import(`../messages/${locale}.json`)).default,
+  }
+})

src/lib/api.ts

@@ -1,6 +1,6 @@
-import { getPrisma } from '@/lib/prisma'
+import { prisma } from '@/lib/prisma'
 import { ExpenseFormValues, GroupFormValues } from '@/lib/schemas'
-import { Expense } from '@prisma/client'
+import { ActivityType, Expense } from '@prisma/client'
 import { nanoid } from 'nanoid'
 
 export function randomId() {
@@ -8,11 +8,11 @@ export function randomId() {
 }
 
 export async function createGroup(groupFormValues: GroupFormValues) {
-  const prisma = await getPrisma()
   return prisma.group.create({
     data: {
       id: randomId(),
       name: groupFormValues.name,
+      information: groupFormValues.information,
       currency: groupFormValues.currency,
       participants: {
         createMany: {
@@ -30,6 +30,7 @@ export async function createGroup(groupFormValues: GroupFormValues) {
 export async function createExpense(
   expenseFormValues: ExpenseFormValues,
   groupId: string,
+  participantId?: string,
 ): Promise<Expense> {
   const group = await getGroup(groupId)
   if (!group) throw new Error(`Invalid group ID: ${groupId}`)
@@ -42,10 +43,16 @@ export async function createExpense(
       throw new Error(`Invalid participant ID: ${participant}`)
   }
 
-  const prisma = await getPrisma()
+  const expenseId = randomId()
+  await logActivity(groupId, ActivityType.CREATE_EXPENSE, {
+    participantId,
+    expenseId,
+    data: expenseFormValues.title,
+  })
+
   return prisma.expense.create({
     data: {
-      id: randomId(),
+      id: expenseId,
       groupId,
       expenseDate: expenseFormValues.expenseDate,
       categoryId: expenseFormValues.category,
@@ -72,12 +79,23 @@ export async function createExpense(
           })),
         },
       },
+      notes: expenseFormValues.notes,
     },
   })
 }
 
-export async function deleteExpense(expenseId: string) {
-  const prisma = await getPrisma()
+export async function deleteExpense(
+  groupId: string,
+  expenseId: string,
+  participantId?: string,
+) {
+  const existingExpense = await getExpense(groupId, expenseId)
+  await logActivity(groupId, ActivityType.DELETE_EXPENSE, {
+    participantId,
+    expenseId,
+    data: existingExpense?.title,
+  })
+
   await prisma.expense.delete({
     where: { id: expenseId },
     include: { paidFor: true, paidBy: true },
@@ -89,15 +107,14 @@ export async function getGroupExpensesParticipants(groupId: string) {
   return Array.from(
     new Set(
       expenses.flatMap((e) => [
-        e.paidById,
-        ...e.paidFor.map((pf) => pf.participantId),
+        e.paidBy.id,
+        ...e.paidFor.map((pf) => pf.participant.id),
       ]),
     ),
   )
 }
 
 export async function getGroups(groupIds: string[]) {
-  const prisma = await getPrisma()
   return (
     await prisma.group.findMany({
       where: { id: { in: groupIds } },
@@ -113,6 +130,7 @@ export async function updateExpense(
   groupId: string,
   expenseId: string,
   expenseFormValues: ExpenseFormValues,
+  participantId?: string,
 ) {
   const group = await getGroup(groupId)
   if (!group) throw new Error(`Invalid group ID: ${groupId}`)
@@ -128,7 +146,12 @@ export async function updateExpense(
       throw new Error(`Invalid participant ID: ${participant}`)
   }
 
-  const prisma = await getPrisma()
+  await logActivity(groupId, ActivityType.UPDATE_EXPENSE, {
+    participantId,
+    expenseId,
+    data: expenseFormValues.title,
+  })
+
   return prisma.expense.update({
     where: { id: expenseId },
     data: {
@@ -185,6 +208,7 @@ export async function updateExpense(
             id: doc.id,
           })),
       },
+      notes: expenseFormValues.notes,
     },
   })
 }
@@ -192,15 +216,18 @@ export async function updateExpense(
 export async function updateGroup(
   groupId: string,
   groupFormValues: GroupFormValues,
+  participantId?: string,
 ) {
   const existingGroup = await getGroup(groupId)
   if (!existingGroup) throw new Error('Invalid group ID')
 
-  const prisma = await getPrisma()
+  await logActivity(groupId, ActivityType.UPDATE_GROUP, { participantId })
+
   return prisma.group.update({
     where: { id: groupId },
     data: {
       name: groupFormValues.name,
+      information: groupFormValues.information,
       currency: groupFormValues.currency,
       participants: {
         deleteMany: existingGroup.participants.filter(
@@ -228,7 +255,6 @@ export async function updateGroup(
 }
 
 export async function getGroup(groupId: string) {
-  const prisma = await getPrisma()
   return prisma.group.findUnique({
     where: { id: groupId },
     include: { participants: true },
@@ -236,27 +262,67 @@ export async function getGroup(groupId: string) {
 }
 
 export async function getCategories() {
-  const prisma = await getPrisma()
   return prisma.category.findMany()
 }
 
-export async function getGroupExpenses(groupId: string) {
-  const prisma = await getPrisma()
+export async function getGroupExpenses(
+  groupId: string,
+  options?: { offset: number; length: number },
+) {
   return prisma.expense.findMany({
-    where: { groupId },
-    include: {
-      paidFor: { include: { participant: true } },
-      paidBy: true,
+    select: {
+      amount: true,
       category: true,
+      createdAt: true,
+      expenseDate: true,
+      id: true,
+      isReimbursement: true,
+      paidBy: { select: { id: true, name: true } },
+      paidFor: {
+        select: {
+          participant: { select: { id: true, name: true } },
+          shares: true,
+        },
+      },
+      splitMode: true,
+      title: true,
     },
+    where: { groupId },
     orderBy: [{ expenseDate: 'desc' }, { createdAt: 'desc' }],
+    skip: options && options.offset,
+    take: options && options.length,
   })
 }
 
+export async function getGroupExpenseCount(groupId: string) {
+  return prisma.expense.count({ where: { groupId } })
+}
+
 export async function getExpense(groupId: string, expenseId: string) {
-  const prisma = await getPrisma()
   return prisma.expense.findUnique({
     where: { id: expenseId },
     include: { paidBy: true, paidFor: true, category: true, documents: true },
   })
 }
+
+export async function getActivities(groupId: string) {
+  return prisma.activity.findMany({
+    where: { groupId },
+    orderBy: [{ time: 'desc' }],
+  })
+}
+
+export async function logActivity(
+  groupId: string,
+  activityType: ActivityType,
+  extra?: { participantId?: string; expenseId?: string; data?: string },
+) {
+  return prisma.activity.create({
+    data: {
+      id: randomId(),
+      groupId,
+      activityType,
+      ...extra,
+    },
+  })
+}

src/lib/balances.ts

@@ -19,7 +19,7 @@ export function getBalances(
   const balances: Balances = {}
 
   for (const expense of expenses) {
-    const paidBy = expense.paidById
+    const paidBy = expense.paidBy.id
     const paidFors = expense.paidFor
 
     if (!balances[paidBy]) balances[paidBy] = { paid: 0, paidFor: 0, total: 0 }
@@ -31,8 +31,8 @@ export function getBalances(
     )
     let remaining = expense.amount
     paidFors.forEach((paidFor, index) => {
-      if (!balances[paidFor.participantId])
-        balances[paidFor.participantId] = { paid: 0, paidFor: 0, total: 0 }
+      if (!balances[paidFor.participant.id])
+        balances[paidFor.participant.id] = { paid: 0, paidFor: 0, total: 0 }
 
       const isLast = index === paidFors.length - 1
 
@@ -47,7 +47,7 @@ export function getBalances(
         ? remaining
         : (expense.amount * shares) / totalShares
       remaining -= dividedAmount
-      balances[paidFor.participantId].paidFor += dividedAmount
+      balances[paidFor.participant.id].paidFor += dividedAmount
     })
   }
 
@@ -82,13 +82,29 @@ export function getPublicBalances(reimbursements: Reimbursement[]): Balances {
   return balances
 }
 
+/**
+ * A comparator that is stable across reimbursements.
+ * This ensures that a participant executing a suggested reimbursement
+ * does not result in completely new repayment suggestions.
+ */
+function compareBalancesForReimbursements(b1: any, b2: any): number {
+  // positive balances come before negative balances
+  if (b1.total > 0 && 0 > b2.total) {
+    return -1
+  } else if (b2.total > 0 && 0 > b1.total) {
+    return 1
+  }
+  // if signs match, sort based on userid
+  return b1.participantId < b2.participantId ? -1 : 1
+}
+
 export function getSuggestedReimbursements(
   balances: Balances,
 ): Reimbursement[] {
   const balancesArray = Object.entries(balances)
     .map(([participantId, { total }]) => ({ participantId, total }))
     .filter((b) => b.total !== 0)
-  balancesArray.sort((b1, b2) => b2.total - b1.total)
+  balancesArray.sort(compareBalancesForReimbursements)
   const reimbursements: Reimbursement[] = []
   while (balancesArray.length > 1) {
     const first = balancesArray[0]

src/lib/env.ts

@@ -1,5 +1,10 @@
 import { ZodIssueCode, z } from 'zod'
 
+const interpretEnvVarAsBool = (val: unknown): boolean => {
+  if (typeof val !== 'string') return false
+  return ['true', 'yes', '1', 'on'].includes(val.toLowerCase())
+}
+
 const envSchema = z
   .object({
     POSTGRES_URL_NON_POOLING: z.string().url(),
@@ -12,14 +17,23 @@ const envSchema = z
           ? `https://${process.env.VERCEL_URL}`
           : 'http://localhost:3000',
       ),
-    NEXT_PUBLIC_ENABLE_EXPENSE_DOCUMENTS: z.coerce.boolean().default(false),
+    NEXT_PUBLIC_ENABLE_EXPENSE_DOCUMENTS: z.preprocess(
+      interpretEnvVarAsBool,
+      z.boolean().default(false),
+    ),
     S3_UPLOAD_KEY: z.string().optional(),
     S3_UPLOAD_SECRET: z.string().optional(),
     S3_UPLOAD_BUCKET: z.string().optional(),
     S3_UPLOAD_REGION: z.string().optional(),
     S3_UPLOAD_ENDPOINT: z.string().optional(),
-    NEXT_PUBLIC_ENABLE_RECEIPT_EXTRACT: z.coerce.boolean().default(false),
-    NEXT_PUBLIC_ENABLE_CATEGORY_EXTRACT: z.coerce.boolean().default(false),
+    NEXT_PUBLIC_ENABLE_RECEIPT_EXTRACT: z.preprocess(
+      interpretEnvVarAsBool,
+      z.boolean().default(false),
+    ),
+    NEXT_PUBLIC_ENABLE_CATEGORY_EXTRACT: z.preprocess(
+      interpretEnvVarAsBool,
+      z.boolean().default(false),
+    ),
     OPENAI_API_KEY: z.string().optional(),
   })
   .superRefine((env, ctx) => {

src/lib/featureFlags.ts

@@ -0,0 +1,15 @@
+'use server'
+
+import { env } from './env'
+
+export async function getRuntimeFeatureFlags() {
+  return {
+    enableExpenseDocuments: env.NEXT_PUBLIC_ENABLE_EXPENSE_DOCUMENTS,
+    enableReceiptExtract: env.NEXT_PUBLIC_ENABLE_RECEIPT_EXTRACT,
+    enableCategoryExtract: env.NEXT_PUBLIC_ENABLE_CATEGORY_EXTRACT,
+  }
+}
+
+export type RuntimeFeatureFlags = Awaited<
+  ReturnType<typeof getRuntimeFeatureFlags>
+>

src/lib/hooks.ts

@@ -48,3 +48,17 @@ export function useBaseUrl() {
   }, [])
   return baseUrl
 }
+
+/**
+ * @returns The active user, or `null` until it is fetched from local storage
+ */
+export function useActiveUser(groupId: string) {
+  const [activeUser, setActiveUser] = useState<string | null>(null)
+
+  useEffect(() => {
+    const activeUser = localStorage.getItem(`${groupId}-activeUser`)
+    if (activeUser) setActiveUser(activeUser)
+  }, [groupId])
+
+  return activeUser
+}

src/lib/locale.ts

@@ -0,0 +1,42 @@
+'use server'
+
+import { Locale, Locales, defaultLocale, locales } from '@/i18n'
+import { match } from '@formatjs/intl-localematcher'
+import Negotiator from 'negotiator'
+import { cookies, headers } from 'next/headers'
+
+const COOKIE_NAME = 'NEXT_LOCALE'
+
+function getAcceptLanguageLocale(requestHeaders: Headers, locales: Locales) {
+  let locale
+  const languages = new Negotiator({
+    headers: {
+      'accept-language': requestHeaders.get('accept-language') || undefined,
+    },
+  }).languages()
+  try {
+    locale = match(languages, locales, defaultLocale)
+  } catch (e) {
+    // invalid language
+  }
+  return locale
+}
+
+export async function getUserLocale() {
+  let locale
+
+  // Prio 1: use existing cookie
+  locale = cookies().get(COOKIE_NAME)?.value
+
+  // Prio 2: use `accept-language` header
+  // Prio 3: use default locale
+  if (!locale) {
+    locale = getAcceptLanguageLocale(headers(), locales)
+  }
+
+  return locale
+}
+
+export async function setUserLocale(locale: Locale) {
+  cookies().set(COOKIE_NAME, locale)
+}

src/lib/prisma.ts

@@ -1,20 +1,21 @@
 import { PrismaClient } from '@prisma/client'
 
-let prisma: PrismaClient
+declare const global: Global & { prisma?: PrismaClient }
 
-export async function getPrisma() {
+export let p: PrismaClient = undefined as any as PrismaClient
+
+if (typeof window === 'undefined') {
   // await delay(1000)
-  if (!prisma) {
-    if (process.env.NODE_ENV === 'production') {
-      prisma = new PrismaClient()
-    } else {
-      if (!(global as any).prisma) {
-        ;(global as any).prisma = new PrismaClient({
-          // log: [{ emit: 'stdout', level: 'query' }],
-        })
-      }
-      prisma = (global as any).prisma
+  if (process.env['NODE_ENV'] === 'production') {
+    p = new PrismaClient()
+  } else {
+    if (!global.prisma) {
+      global.prisma = new PrismaClient({
+        // log: [{ emit: 'stdout', level: 'query' }],
+      })
     }
+    p = global.prisma
   }
-  return prisma
 }
+
+export const prisma = p

src/lib/schemas.ts

@@ -3,22 +3,14 @@ import * as z from 'zod'
 
 export const groupFormSchema = z
   .object({
-    name: z
-      .string()
-      .min(2, 'Enter at least two characters.')
-      .max(50, 'Enter at most 50 characters.'),
-    currency: z
-      .string()
-      .min(1, 'Enter at least one character.')
-      .max(5, 'Enter at most five characters.'),
+    name: z.string().min(2, 'min2').max(50, 'max50'),
+    information: z.string().optional(),
+    currency: z.string().min(1, 'min1').max(5, 'max5'),
     participants: z
       .array(
         z.object({
           id: z.string().optional(),
-          name: z
-            .string()
-            .min(2, 'Enter at least two characters.')
-            .max(50, 'Enter at most 50 characters.'),
+          name: z.string().min(2, 'min2').max(50, 'max50'),
         }),
       )
       .min(1),
@@ -29,7 +21,7 @@ export const groupFormSchema = z
         if (otherParticipant.name === participant.name) {
           ctx.addIssue({
             code: 'custom',
-            message: 'Another participant already has this name.',
+            message: 'duplicateParticipantName',
             path: ['participants', i, 'name'],
           })
         }
@@ -42,33 +34,27 @@ export type GroupFormValues = z.infer<typeof groupFormSchema>
 export const expenseFormSchema = z
   .object({
     expenseDate: z.coerce.date(),
-    title: z
-      .string({ required_error: 'Please enter a title.' })
-      .min(2, 'Enter at least two characters.'),
+    title: z.string({ required_error: 'titleRequired' }).min(2, 'min2'),
     category: z.coerce.number().default(0),
     amount: z
       .union(
         [
           z.number(),
           z.string().transform((value, ctx) => {
-            const normalizedValue = value.replace(/,/g, '.')
-            const valueAsNumber = Number(normalizedValue)
+            const valueAsNumber = Number(value)
             if (Number.isNaN(valueAsNumber))
               ctx.addIssue({
                 code: z.ZodIssueCode.custom,
-                message: 'Invalid number.',
+                message: 'invalidNumber',
               })
             return Math.round(valueAsNumber * 100)
           }),
         ],
-        { required_error: 'You must enter an amount.' },
+        { required_error: 'amountRequired' },
       )
-      .refine((amount) => amount >= 1, 'The amount must be higher than 0.01.')
-      .refine(
-        (amount) => amount <= 10_000_000_00,
-        'The amount must be lower than 10,000,000.',
-      ),
-    paidBy: z.string({ required_error: 'You must select a participant.' }),
+      .refine((amount) => amount != 1, 'amountNotZero')
+      .refine((amount) => amount <= 10_000_000_00, 'amountTenMillion'),
+    paidBy: z.string({ required_error: 'paidByRequired' }),
     paidFor: z
       .array(
         z.object({
@@ -81,14 +67,14 @@ export const expenseFormSchema = z
               if (Number.isNaN(valueAsNumber))
                 ctx.addIssue({
                   code: z.ZodIssueCode.custom,
-                  message: 'Invalid number.',
+                  message: 'invalidNumber',
                 })
               return Math.round(valueAsNumber * 100)
             }),
           ]),
         }),
       )
-      .min(1, 'The expense must be paid for at least one participant.')
+      .min(1, 'paidForMin1')
       .superRefine((paidFor, ctx) => {
         let sum = 0
         for (const { shares } of paidFor) {
@@ -96,7 +82,7 @@ export const expenseFormSchema = z
           if (shares < 1) {
             ctx.addIssue({
               code: z.ZodIssueCode.custom,
-              message: 'All shares must be higher than 0.',
+              message: 'noZeroShares',
             })
           }
         }
@@ -106,6 +92,7 @@ export const expenseFormSchema = z
         Object.values(SplitMode) as any,
       )
       .default('EVENLY'),
+    saveDefaultSplittingOptions: z.boolean(),
     isReimbursement: z.boolean(),
     documents: z
       .array(
@@ -117,6 +104,7 @@ export const expenseFormSchema = z
         }),
       )
       .default([]),
+    notes: z.string().optional(),
   })
   .superRefine((expense, ctx) => {
     let sum = 0
@@ -137,7 +125,7 @@ export const expenseFormSchema = z
               : `${((sum - expense.amount) / 100).toFixed(2)} surplus`
           ctx.addIssue({
             code: z.ZodIssueCode.custom,
-            message: `Sum of amounts must equal the expense amount (${detail}).`,
+            message: 'amountSum',
             path: ['paidFor'],
           })
         }
@@ -151,7 +139,7 @@ export const expenseFormSchema = z
               : `${((sum - 10000) / 100).toFixed(0)}% surplus`
           ctx.addIssue({
             code: z.ZodIssueCode.custom,
-            message: `Sum of percentages must equal 100 (${detail})`,
+            message: 'percentageSum',
             path: ['paidFor'],
           })
         }
@@ -161,3 +149,9 @@ export const expenseFormSchema = z
   })
 
 export type ExpenseFormValues = z.infer<typeof expenseFormSchema>
+
+export type SplittingOptions = {
+  // Used for saving default splitting options in localStorage
+  splitMode: SplitMode
+  paidFor: ExpenseFormValues['paidFor'] | null
+}

src/lib/totals.ts

@@ -0,0 +1,70 @@
+import { getGroupExpenses } from '@/lib/api'
+
+export function getTotalGroupSpending(
+  expenses: NonNullable<Awaited<ReturnType<typeof getGroupExpenses>>>,
+): number {
+  return expenses.reduce(
+    (total, expense) =>
+      expense.isReimbursement ? total : total + expense.amount,
+    0,
+  )
+}
+
+export function getTotalActiveUserPaidFor(
+  activeUserId: string | null,
+  expenses: NonNullable<Awaited<ReturnType<typeof getGroupExpenses>>>,
+): number {
+  return expenses.reduce(
+    (total, expense) =>
+      expense.paidBy.id === activeUserId && !expense.isReimbursement
+        ? total + expense.amount
+        : total,
+    0,
+  )
+}
+
+export function getTotalActiveUserShare(
+  activeUserId: string | null,
+  expenses: NonNullable<Awaited<ReturnType<typeof getGroupExpenses>>>,
+): number {
+  let total = 0
+
+  expenses.forEach((expense) => {
+    if (expense.isReimbursement) return
+
+    const paidFors = expense.paidFor
+    const userPaidFor = paidFors.find(
+      (paidFor) => paidFor.participant.id === activeUserId,
+    )
+
+    if (!userPaidFor) {
+      // If the active user is not involved in the expense, skip it
+      return
+    }
+
+    switch (expense.splitMode) {
+      case 'EVENLY':
+        // Divide the total expense evenly among all participants
+        total += expense.amount / paidFors.length
+        break
+      case 'BY_AMOUNT':
+        // Directly add the user's share if the split mode is BY_AMOUNT
+        total += userPaidFor.shares
+        break
+      case 'BY_PERCENTAGE':
+        // Calculate the user's share based on their percentage of the total expense
+        total += (expense.amount * userPaidFor.shares) / 10000 // Assuming shares are out of 10000 for percentage
+        break
+      case 'BY_SHARES':
+        // Calculate the user's share based on their shares relative to the total shares
+        const totalShares = paidFors.reduce(
+          (sum, paidFor) => sum + paidFor.shares,
+          0,
+        )
+        total += (expense.amount * userPaidFor.shares) / totalShares
+        break
+    }
+  })
+
+  return parseFloat(total.toFixed(2))
+}

src/lib/utils.ts

@@ -10,9 +10,16 @@ export function delay(ms: number) {
   return new Promise((resolve) => setTimeout(resolve, ms))
 }
 
-export function formatExpenseDate(date: Date) {
-  return date.toLocaleDateString('en-US', {
-    dateStyle: 'medium',
+export type DateTimeStyle = NonNullable<
+  ConstructorParameters<typeof Intl.DateTimeFormat>[1]
+>['dateStyle']
+export function formatDate(
+  date: Date,
+  locale: string,
+  options: { dateStyle?: DateTimeStyle; timeStyle?: DateTimeStyle } = {},
+) {
+  return date.toLocaleString(locale, {
+    ...options,
     timeZone: 'UTC',
   })
 }
@@ -21,18 +28,25 @@ export function formatCategoryForAIPrompt(category: Category) {
   return `"${category.grouping}/${category.name}" (ID: ${category.id})`
 }
 
-export function formatCurrency(currency: string, amount: number) {
-  const format = new Intl.NumberFormat('en-US', {
+export function formatCurrency(
+  currency: string,
+  amount: number,
+  locale: string,
+) {
+  const format = new Intl.NumberFormat(locale, {
     minimumFractionDigits: 2,
     maximumFractionDigits: 2,
+    style: 'currency',
+    // '€' will be placed in correct position
+    currency: 'EUR',
   })
   const formattedAmount = format.format(amount / 100)
-  return `${currency} ${formattedAmount}`
+  return formattedAmount.replace('€', currency)
 }
 
-export function formatFileSize(size: number) {
+export function formatFileSize(size: number, locale: string) {
   const formatNumber = (num: number) =>
-    num.toLocaleString('en-US', {
+    num.toLocaleString(locale, {
       minimumFractionDigits: 0,
       maximumFractionDigits: 1,
     })
@@ -42,3 +56,13 @@ export function formatFileSize(size: number) {
   if (size > 1024) return `${formatNumber(size / 1024)} kB`
   return `${formatNumber(size)} B`
 }
+
+export function normalizeString(input: string): string {
+  // Replaces special characters
+  // Input: áäåèéę
+  // Output: aaaeee
+  return input
+    .toLowerCase()
+    .normalize('NFD')
+    .replace(/[\u0300-\u036f]/g, '')
+}

src/scripts/migrate.ts

@@ -1,6 +1,6 @@
 // @ts-nocheck
 import { randomId } from '@/lib/api'
-import { getPrisma } from '@/lib/prisma'
+import { prisma } from '@/lib/prisma'
 import { Prisma } from '@prisma/client'
 import { Client } from 'pg'
 
@@ -8,8 +8,6 @@ process.env.NODE_TLS_REJECT_UNAUTHORIZED = '0'
 
 async function main() {
   withClient(async (client) => {
-    const prisma = await getPrisma()
-
     // console.log('Deleting all groups…')
     // await prisma.group.deleteMany({})