Add download splitpro data (#35)

Author: KMKoushik

src/pages/account.tsx

@@ -3,7 +3,7 @@ import MainLayout from '~/components/Layout/MainLayout';
 import { Button } from '~/components/ui/button';
 import Link from 'next/link';
 import { UserAvatar } from '~/components/ui/avatar';
-import { Bell, ChevronRight, Download, Github, Star } from 'lucide-react';
+import { Bell, ChevronRight, Download, FileDown, Github, Star } from 'lucide-react';
 import { signOut } from 'next-auth/react';
 import { AppDrawer } from '~/components/ui/drawer';
 import { SubmitFeedback } from '~/components/Account/SubmitFeedback';
@@ -13,9 +13,27 @@ import { type NextPageWithUser } from '~/types';
 import { toast } from 'sonner';
 import { env } from '~/env';
 import { SubscribeNotification } from '~/components/Account/SubscribeNotification';
+import { useState } from 'react';
+import { LoadingSpinner } from '~/components/ui/spinner';
 
 const AccountPage: NextPageWithUser = ({ user }) => {
   const userQuery = api.user.me.useQuery();
+  const downloadQuery = api.user.downloadData.useMutation();
+
+  const [downloading, setDownloading] = useState(false);
+
+  async function downloadData() {
+    setDownloading(true);
+    const data = await downloadQuery.mutateAsync();
+    const blob = new Blob([JSON.stringify(data, null, 2)], { type: 'application/json' });
+    const url = URL.createObjectURL(blob);
+    const link = document.createElement('a');
+    link.href = url;
+    link.download = 'splitpro_data.json';
+    link.click();
+    URL.revokeObjectURL(url);
+    setDownloading(false);
+  }
 
   return (
     <>
@@ -136,6 +154,22 @@ const AccountPage: NextPageWithUser = ({ user }) => {
                 </p>
               </div>
             </AppDrawer>
+            <Button
+              variant="ghost"
+              className="text-md w-full justify-between px-0 hover:text-foreground/80"
+              onClick={downloadData}
+              disabled={downloading}
+            >
+              <div className="flex items-center gap-4">
+                <FileDown className="h-5 w-5 text-teal-500" />
+                Download splitpro data
+              </div>
+              {downloading ? (
+                <LoadingSpinner />
+              ) : (
+                <ChevronRight className="h-6 w-6 text-gray-500" />
+              )}
+            </Button>
           </div>
 
           <div className="mt-20 flex justify-center">

src/server/api/routers/user.ts

@@ -1,14 +1,20 @@
-import { SplitType } from '@prisma/client';
+import { type Balance, SplitType } from '@prisma/client';
 import { boolean, z } from 'zod';
 import { createTRPCRouter, protectedProcedure } from '~/server/api/trpc';
 import { db } from '~/server/db';
-import { addUserExpense, deleteExpense } from '../services/splitService';
+import {
+  addUserExpense,
+  deleteExpense,
+  getCompleteFriendsDetails,
+  getCompleteGroupDetails,
+} from '../services/splitService';
 import { TRPCError } from '@trpc/server';
 import { randomUUID } from 'crypto';
 import { getDocumentUploadUrl } from '~/server/storage';
 import { FILE_SIZE_LIMIT } from '~/lib/constants';
 import { sendFeedbackEmail } from '~/server/mailer';
 import { pushNotification } from '~/server/notification';
+import { toFixedNumber, toUIString } from '~/utils/numbers';
 
 export const userRouter = createTRPCRouter({
   me: protectedProcedure.query(async ({ ctx }) => {
@@ -441,4 +447,13 @@ export const userRouter = createTRPCRouter({
         },
       });
     }),
+
+  downloadData: protectedProcedure.mutation(async ({ ctx }) => {
+    const user = ctx.session.user;
+
+    const friends = await getCompleteFriendsDetails(user.id);
+    const groups = await getCompleteGroupDetails(user.id);
+
+    return { friends, groups };
+  }),
 });

src/server/api/services/splitService.ts

@@ -551,3 +551,67 @@ export async function sendExpensePushNotification(expenseId: string) {
 
   await Promise.all(pushNotifications);
 }
+
+export async function getCompleteFriendsDetails(userId: number) {
+  const balances = await db.balance.findMany({
+    where: {
+      userId,
+    },
+    include: {
+      friend: true,
+    },
+  });
+
+  const friends = balances.reduce(
+    (acc, balance) => {
+      const friendId = balance.friendId;
+      if (!acc[friendId]) {
+        acc[friendId] = {
+          balances: [],
+          id: balance.friendId,
+          email: balance.friend.email,
+          name: balance.friend.name,
+        };
+      }
+
+      if (balance.amount !== 0) {
+        acc[friendId]?.balances.push({
+          currency: balance.currency,
+          amount:
+            balance.amount > 0 ? toFixedNumber(balance.amount) : toFixedNumber(balance.amount),
+        });
+      }
+
+      return acc;
+    },
+    {} as Record<
+      number,
+      {
+        id: number;
+        email?: string | null;
+        name?: string | null;
+        balances: { currency: string; amount: number }[];
+      }
+    >,
+  );
+
+  return friends;
+}
+
+export async function getCompleteGroupDetails(userId: number) {
+  const groups = await db.group.findMany({
+    where: {
+      groupUsers: {
+        some: {
+          userId,
+        },
+      },
+    },
+    include: {
+      groupUsers: true,
+      groupBalances: true,
+    },
+  });
+
+  return groups;
+}