// This is your Prisma schema file,
// learn more about it in the docs: https://pris.ly/d/prisma-schema

generator client {
  provider = "prisma-client-js"
}

datasource db {
  provider  = "postgresql"
  url       = env("POSTGRES_PRISMA_URL") // uses connection pooling
  directUrl = env("POSTGRES_URL_NON_POOLING") // uses a direct connection
}

model Group {
  id           String        @id
  name         String
  information  String?       @db.Text
  currency     String        @default("$")
  participants Participant[]
  expenses     Expense[]
  activities   Activity[]
  createdAt    DateTime      @default(now())
}

model Participant {
  id              String           @id
  name            String
  group           Group            @relation(fields: [groupId], references: [id], onDelete: Cascade)
  groupId         String
  expensesPaidBy  Expense[]
  expensesPaidFor ExpensePaidFor[]
}

model Category {
  id       Int       @id @default(autoincrement())
  grouping String
  name     String
  Expense  Expense[]
}

model Expense {
  id              String            @id
  group           Group             @relation(fields: [groupId], references: [id], onDelete: Cascade)
  expenseDate     DateTime          @default(dbgenerated("CURRENT_DATE")) @db.Date
  title           String
  category        Category?         @relation(fields: [categoryId], references: [id])
  categoryId      Int               @default(0)
  amount          Int
  paidBy          Participant       @relation(fields: [paidById], references: [id], onDelete: Cascade)
  paidById        String
  paidFor         ExpensePaidFor[]
  groupId         String
  isReimbursement Boolean           @default(false)
  splitMode       SplitMode         @default(EVENLY)
  createdAt       DateTime          @default(now())
  documents       ExpenseDocument[]
  notes           String?
}

model ExpenseDocument {
  id        String   @id
  url       String
  width     Int
  height    Int
  Expense   Expense? @relation(fields: [expenseId], references: [id])
  expenseId String?
}

enum SplitMode {
  EVENLY
  BY_SHARES
  BY_PERCENTAGE
  BY_AMOUNT
}

model ExpensePaidFor {
  expense       Expense     @relation(fields: [expenseId], references: [id], onDelete: Cascade)
  participant   Participant @relation(fields: [participantId], references: [id], onDelete: Cascade)
  expenseId     String
  participantId String
  shares        Int         @default(1)

  @@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
}