feat: add stats to profile response

Made-with: Cursor

src/services/user/user.service.ts

@@ -1,13 +1,30 @@
 import { eq } from 'drizzle-orm';
 import type { NodePgDatabase } from 'drizzle-orm/node-postgres';
 import type * as schema from '../../db/schema/index.js';
-import { users } from '../../db/schema/index.js';
+import { users, userStats } from '../../db/schema/index.js';
 import { notFound, conflict, ERROR_CODES } from '../../utils/errors.js';
 import type { User } from '../../db/schema/users.js';
 import type { SelfLevel } from '../../db/schema/index.js';
 
 type Db = NodePgDatabase<typeof schema>;
 
+export type UserStatItem = {
+  stack: string;
+  level: string;
+  totalQuestions: number;
+  correctAnswers: number;
+  testsTaken: number;
+  lastTestAt: string | null;
+};
+
+export type ProfileStats = {
+  byStack: UserStatItem[];
+  totalTestsTaken: number;
+  totalQuestions: number;
+  correctAnswers: number;
+  accuracy: number | null;
+};
+
 export type ProfileUpdateInput = {
   nickname?: string;
   avatarUrl?: string | null;
@@ -25,6 +42,7 @@ export type PublicProfile = {
   city: string | null;
   selfLevel: string | null;
   isPublic: boolean;
+  stats: ProfileStats;
 };
 
 export type PrivateProfile = PublicProfile & {
@@ -34,7 +52,30 @@ export type PrivateProfile = PublicProfile & {
   updatedAt: string;
 };
 
-function toPublicProfile(user: User): PublicProfile {
+async function getStatsForUser(db: Db, userId: string): Promise<ProfileStats> {
+  const rows = await db
+    .select()
+    .from(userStats)
+    .where(eq(userStats.userId, userId));
+
+  const byStack: UserStatItem[] = rows.map((r) => ({
+    stack: r.stack,
+    level: r.level,
+    totalQuestions: r.totalQuestions,
+    correctAnswers: r.correctAnswers,
+    testsTaken: r.testsTaken,
+    lastTestAt: r.lastTestAt?.toISOString() ?? null,
+  }));
+
+  const totalTestsTaken = rows.reduce((sum, r) => sum + r.testsTaken, 0);
+  const totalQuestions = rows.reduce((sum, r) => sum + r.totalQuestions, 0);
+  const correctAnswers = rows.reduce((sum, r) => sum + r.correctAnswers, 0);
+  const accuracy = totalQuestions > 0 ? correctAnswers / totalQuestions : null;
+
+  return { byStack, totalTestsTaken, totalQuestions, correctAnswers, accuracy };
+}
+
+function toPublicProfile(user: User, stats: ProfileStats): PublicProfile {
   return {
     id: user.id,
     nickname: user.nickname,
@@ -43,12 +84,13 @@ function toPublicProfile(user: User): PublicProfile {
     city: user.city,
     selfLevel: user.selfLevel,
     isPublic: user.isPublic,
+    stats,
   };
 }
 
-function toPrivateProfile(user: User): PrivateProfile {
+function toPrivateProfile(user: User, stats: ProfileStats): PrivateProfile {
   return {
-    ...toPublicProfile(user),
+    ...toPublicProfile(user, stats),
     email: user.email,
     emailVerifiedAt: user.emailVerifiedAt?.toISOString() ?? null,
     createdAt: user.createdAt.toISOString(),
@@ -74,11 +116,11 @@ export class UserService {
   }
 
   async getPrivateProfile(userId: string): Promise<PrivateProfile> {
-    const user = await this.getById(userId);
+    const [user, stats] = await Promise.all([this.getById(userId), getStatsForUser(this.db, userId)]);
     if (!user) {
       throw notFound('User not found');
     }
-    return toPrivateProfile(user);
+    return toPrivateProfile(user, stats);
   }
 
   async getPublicProfile(username: string): Promise<PublicProfile> {
@@ -89,7 +131,8 @@ export class UserService {
     if (!user.isPublic) {
       throw notFound('User not found');
     }
-    return toPublicProfile(user);
+    const stats = await getStatsForUser(this.db, user.id);
+    return toPublicProfile(user, stats);
   }
 
   async updateProfile(userId: string, input: ProfileUpdateInput): Promise<PrivateProfile> {
@@ -126,6 +169,7 @@ export class UserService {
       throw notFound('User not found');
     }
 
-    return toPrivateProfile(updated);
+    const stats = await getStatsForUser(this.db, userId);
+    return toPrivateProfile(updated, stats);
   }
 }