AI Implementation feature(857): Authenticated Shell: Header, Quick Tabs and Change Password (#14)

backend/src/modules/users/users-rank.service.ts

@@ -0,0 +1,34 @@
+import { Injectable } from '@nestjs/common';
+import { EntityManager } from 'typeorm';
+import { SolveEntity } from '../../database/entities/solve.entity';
+
+export interface RankInfo {
+  rank: number | null;
+  points: number;
+}
+
+@Injectable()
+export class UsersRankService {
+  async rankOfUser(manager: EntityManager, userId: string): Promise<RankInfo> {
+    const solveRepo = manager.getRepository(SolveEntity);
+    const pointsRow = await solveRepo
+      .createQueryBuilder('s')
+      .select('COALESCE(SUM(s.pointsAwarded), 0)', 'total')
+      .where('s.userId = :userId', { userId })
+      .getRawOne<{ total: string | number | null }>();
+    const points = Number(pointsRow?.total ?? 0);
+
+    if (points <= 0) {
+      return { rank: null, points: 0 };
+    }
+
+    const ahead = await solveRepo
+      .createQueryBuilder('s')
+      .select('s.userId', 'userId')
+      .addSelect('SUM(s.pointsAwarded)', 'total')
+      .groupBy('s.userId')
+      .having('SUM(s.pointsAwarded) > :points', { points })
+      .getRawMany<{ userId: string }>();
+    return { rank: ahead.length + 1, points };
+  }
+}

backend/src/modules/users/users.module.ts

@@ -1,14 +1,16 @@
-import { Module } from '@nestjs/common';
+import { forwardRef, Module } from '@nestjs/common';
 import { TypeOrmModule } from '@nestjs/typeorm';
 import { UserEntity } from '../../database/entities/user.entity';
+import { SolveEntity } from '../../database/entities/solve.entity';
 import { UsersService } from './users.service';
+import { UsersRankService } from './users-rank.service';
 import { UsersController } from './users.controller';
 import { AuthModule } from '../auth/auth.module';
 
 @Module({
-  imports: [TypeOrmModule.forFeature([UserEntity]), AuthModule],
-  providers: [UsersService],
+  imports: [TypeOrmModule.forFeature([UserEntity, SolveEntity]), forwardRef(() => AuthModule)],
+  providers: [UsersService, UsersRankService],
   controllers: [UsersController],
-  exports: [UsersService],
+  exports: [UsersService, UsersRankService],
 })
 export class UsersModule {}