Initial commit: NestJS backend for Child Gold Land

Co-authored-by: Cursor <cursoragent@cursor.com>

src/users/users.service.ts

@@ -0,0 +1,107 @@
+import {
+  Inject,
+  Injectable,
+  InternalServerErrorException,
+  Logger,
+  forwardRef,
+} from '@nestjs/common'
+import { DatabaseService } from '../database/database.service'
+import { createDefaultUserState } from '../shared/catalog/default-user-state'
+import type { MeResponse, UserState } from '../shared/types/user.types'
+import { GoldLandProgressionService } from '../gold-land/services/progression.service'
+
+@Injectable()
+export class UsersService {
+  private readonly logger = new Logger(UsersService.name)
+
+  constructor(
+    @Inject(DatabaseService) private readonly database: DatabaseService,
+    @Inject(forwardRef(() => GoldLandProgressionService))
+    private readonly goldLandProgression: GoldLandProgressionService,
+  ) {}
+
+  ensureUser(userId: string): UserState {
+    return this.getUserState(userId)
+  }
+
+  getUserState(userId: string): UserState {
+    const row = this.database
+      .getDb()
+      .prepare('SELECT state_json FROM users WHERE id = ?')
+      .get(userId) as { state_json: string } | undefined
+
+    if (row) {
+      return this.parseStateJson(row.state_json, userId)
+    }
+
+    const state = createDefaultUserState(userId)
+    this.database
+      .getDb()
+      .prepare('INSERT INTO users (id, state_json, updated_at) VALUES (?, ?, ?)')
+      .run(userId, JSON.stringify(state), new Date().toISOString())
+    return state
+  }
+
+  saveUserState(state: UserState): UserState {
+    this.database
+      .getDb()
+      .prepare('UPDATE users SET state_json = ?, updated_at = ? WHERE id = ?')
+      .run(JSON.stringify(state), new Date().toISOString(), state.id)
+    return state
+  }
+
+  toMeResponse(state: UserState): MeResponse {
+    return {
+      user: {
+        id: state.id,
+        name: state.name,
+        level: state.level,
+        xp: state.xp,
+        maxXp: state.maxXp,
+        coins: state.coins,
+        missionProgress: state.missionProgress,
+        missionTarget: state.missionTarget,
+      },
+      wallet: {
+        cash: state.cash,
+        goldGrams: state.goldGrams,
+      },
+      progress: {
+        completedChallenges: state.completedChallenges,
+        completedLessons: state.completedLessons,
+        completedGames: state.completedGames,
+        claimedRewards: state.claimedRewards,
+        ownedItems: state.ownedItems,
+        mapLevels: state.mapLevels,
+        totalStars: state.totalStars,
+        maxStars: state.maxStars,
+      },
+      achievements: state.achievements,
+      transactions: state.transactions,
+      market: {
+        selectedRange: state.marketSelectedRange,
+      },
+    }
+  }
+
+  getMe(userId: string): MeResponse {
+    const state = this.goldLandProgression.syncUserProgressionState(userId)
+    return this.toMeResponse(state)
+  }
+
+  updateProfile(userId: string, name: string): MeResponse {
+    const state = this.getUserState(userId)
+    state.name = name.trim()
+    this.saveUserState(state)
+    return this.toMeResponse(state)
+  }
+
+  private parseStateJson(raw: string, userId: string): UserState {
+    try {
+      return JSON.parse(raw) as UserState
+    } catch (error) {
+      this.logger.error(`Invalid state_json for user ${userId}`, error)
+      throw new InternalServerErrorException('داده کاربر نامعتبر است')
+    }
+  }
+}