Add basic activity log (#141)

* Add basic activity log

* Add database migration

* Fix layout

* Fix types

---------

Co-authored-by: Sebastien Castiel <sebastien@castiel.me>

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

@@ -0,0 +1,102 @@
+'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 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 getSummary(activity: Activity, participantName?: string) {
+  const participant = participantName ?? 'Someone'
+  const expense = activity.data ?? ''
+  if (activity.activityType == ActivityType.UPDATE_GROUP) {
+    return (
+      <>
+        Group settings were modified by <strong>{participant}</strong>
+      </>
+    )
+  } else if (activity.activityType == ActivityType.CREATE_EXPENSE) {
+    return (
+      <>
+        Expense <em>&ldquo;{expense}&rdquo;</em> created by{' '}
+        <strong>{participant}</strong>.
+      </>
+    )
+  } else if (activity.activityType == ActivityType.UPDATE_EXPENSE) {
+    return (
+      <>
+        Expense <em>&ldquo;{expense}&rdquo;</em> updated by{' '}
+        <strong>{participant}</strong>.
+      </>
+    )
+  } else if (activity.activityType == ActivityType.DELETE_EXPENSE) {
+    return (
+      <>
+        Expense <em>&ldquo;{expense}&rdquo;</em> deleted by{' '}
+        <strong>{participant}</strong>.
+      </>
+    )
+  }
+}
+
+export function ActivityItem({
+  groupId,
+  activity,
+  participant,
+  expense,
+  dateStyle,
+}: Props) {
+  const router = useRouter()
+
+  const expenseExists = expense !== undefined
+  const summary = getSummary(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, { dateStyle })}
+          </div>
+        )}
+        <div className="my-1 text-xs/5 text-muted-foreground">
+          {formatDate(activity.time, { 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>
+  )
+}