feat: 更新AI教练控制器，增加用户聊天次数管理功能

- 在AI教练控制器中引入用户聊天次数的检查，确保用户在进行对话前有足够的聊天次数。
- 新增用户服务方法以获取和扣减用户的聊天次数，优化用户体验。
- 调整默认免费聊天次数为5次，提升系统的使用限制管理。

src/ai-coach/ai-coach.controller.ts

@@ -1,4 +1,4 @@
-import { Body, Controller, Delete, Get, Param, Post, Query, Res, StreamableFile, UseGuards } from '@nestjs/common';
+import { Body, Controller, Delete, Get, HttpException, HttpStatus, Logger, Param, Post, Query, Res, StreamableFile, UseGuards } from '@nestjs/common';
 import { ApiTags, ApiOperation, ApiBody, ApiQuery, ApiParam } from '@nestjs/swagger';
 import { Response } from 'express';
 import { JwtAuthGuard } from '../common/guards/jwt-auth.guard';
@@ -7,12 +7,17 @@ import { AccessTokenPayload } from '../users/services/apple-auth.service';
 import { AiCoachService } from './ai-coach.service';
 import { AiChatRequestDto, AiChatResponseDto, AiResponseDataDto } from './dto/ai-chat.dto';
 import { PostureAssessmentRequestDto, PostureAssessmentResponseDto } from './dto/posture-assessment.dto';
+import { UsersService } from '../users/users.service';
 
 @ApiTags('ai-coach')
 @Controller('ai-coach')
 @UseGuards(JwtAuthGuard)
 export class AiCoachController {
-  constructor(private readonly aiCoachService: AiCoachService) { }
+  private readonly logger = new Logger(AiCoachController.name);
+  constructor(
+    private readonly aiCoachService: AiCoachService,
+    private readonly usersService: UsersService,
+  ) { }
 
   @Post('chat')
   @ApiOperation({ summary: '流式大模型对话（普拉提教练）' })
@@ -26,6 +31,13 @@ export class AiCoachController {
     const stream = body.stream !== false; // 默认流式
     const userContent = body.messages?.[body.messages.length - 1]?.content || '';
 
+    // 判断用户是否有聊天次数
+    const usageCount = await this.usersService.getUserUsageCount(userId);
+    if (usageCount <= 0) {
+      this.logger.error(`chat: ${userId} has no usage count`);
+      throw new HttpException('用户没有聊天次数', HttpStatus.FORBIDDEN);
+    }
+
     // 创建或沿用会话ID，并保存用户消息
     const { conversationId } = await this.aiCoachService.createOrAppendMessages({
       userId,
@@ -45,6 +57,8 @@ export class AiCoachController {
       confirmationData: body.confirmationData,
     });
 
+    await this.usersService.deductUserUsageCount(userId);
+
     // 检查是否返回结构化数据（如确认选项）
     // 结构化数据必须使用非流式模式返回
     if (typeof result === 'object' && 'type' in result) {

src/users/users.controller.ts

@@ -317,99 +317,4 @@ export class UsersController {
     }
   }
 
-  /**
-   * 获取营养汇总分析
-   */
-  @UseGuards(JwtAuthGuard)
-  @Get('nutrition-summary')
-  @HttpCode(HttpStatus.OK)
-  @ApiOperation({ summary: '获取最近饮食的营养汇总分析' })
-  @ApiQuery({ name: 'mealCount', required: false, description: '分析最近几顿饮食，默认10顿' })
-  @ApiResponse({ status: 200, description: '成功获取营养汇总', type: DietAnalysisResponseDto })
-  async getNutritionSummary(
-    @Query('mealCount') mealCount: string = '10',
-    @CurrentUser() user: AccessTokenPayload,
-  ): Promise<DietAnalysisResponseDto> {
-    this.logger.log(`获取营养汇总 - 用户ID: ${user.sub}, 分析${mealCount}顿饮食`);
-
-    const count = Math.min(20, Math.max(1, parseInt(mealCount) || 10));
-    const nutritionSummary = await this.usersService.getRecentNutritionSummary(user.sub, count);
-
-    // 获取最近的饮食记录用于分析
-    const recentRecords = await this.usersService.getDietHistory(user.sub, { limit: count });
-
-    // 简单的营养评分算法（可以后续优化）
-    const nutritionScore = this.calculateNutritionScore(nutritionSummary);
-
-    // 生成基础建议（后续可以接入AI分析）
-    const recommendations = this.generateBasicRecommendations(nutritionSummary);
-
-    return {
-      nutritionSummary,
-      recentRecords: recentRecords.records,
-      healthAnalysis: '基于您最近的饮食记录，我将为您提供个性化的营养分析和健康建议。',
-      nutritionScore,
-      recommendations,
-    };
-  }
-
-  /**
-   * 简单的营养评分算法
-   */
-  private calculateNutritionScore(summary: any): number {
-    let score = 50; // 基础分数
-
-    // 基于热量是否合理调整分数
-    const dailyCalories = summary.totalCalories / (summary.recordCount / 3); // 假设一天3餐
-    if (dailyCalories >= 1500 && dailyCalories <= 2500) score += 20;
-    else if (dailyCalories < 1200 || dailyCalories > 3000) score -= 20;
-
-    // 基于蛋白质摄入调整分数
-    const dailyProtein = summary.totalProtein / (summary.recordCount / 3);
-    if (dailyProtein >= 50 && dailyProtein <= 150) score += 15;
-    else if (dailyProtein < 30) score -= 15;
-
-    // 基于膳食纤维调整分数
-    const dailyFiber = summary.totalFiber / (summary.recordCount / 3);
-    if (dailyFiber >= 25) score += 15;
-    else if (dailyFiber < 10) score -= 10;
-
-    return Math.max(0, Math.min(100, score));
-  }
-
-  /**
-   * 生成基础营养建议
-   */
-  private generateBasicRecommendations(summary: any): string[] {
-    const recommendations: string[] = [];
-
-    const dailyCalories = summary.totalCalories / (summary.recordCount / 3);
-    const dailyProtein = summary.totalProtein / (summary.recordCount / 3);
-    const dailyFiber = summary.totalFiber / (summary.recordCount / 3);
-    const dailySodium = summary.totalSodium / (summary.recordCount / 3);
-
-    if (dailyCalories < 1200) {
-      recommendations.push('您的日均热量摄入偏低，建议适当增加营养密度高的食物。');
-    } else if (dailyCalories > 2500) {
-      recommendations.push('您的日均热量摄入偏高，建议控制portion size或选择低热量食物。');
-    }
-
-    if (dailyProtein < 50) {
-      recommendations.push('建议增加优质蛋白质摄入，如鸡胸肉、鱼类、豆制品等。');
-    }
-
-    if (dailyFiber < 25) {
-      recommendations.push('建议增加膳食纤维摄入，多吃蔬菜、水果和全谷物。');
-    }
-
-    if (dailySodium > 2000) {
-      recommendations.push('钠摄入偏高，建议减少加工食品和调味料的使用。');
-    }
-
-    if (recommendations.length === 0) {
-      recommendations.push('您的饮食结构相对均衡，继续保持良好的饮食习惯！');
-    }
-
-    return recommendations;
-  }
 }

src/users/users.service.ts

@@ -36,7 +36,7 @@ import { ActivityLogsService } from '../activity-logs/activity-logs.service';
 import { ActivityActionType, ActivityEntityType } from '../activity-logs/models/activity-log.model';
 import { CreateDietRecordDto, UpdateDietRecordDto, GetDietHistoryQueryDto, DietRecordResponseDto, DietHistoryResponseDto, NutritionSummaryDto } from './dto/diet-record.dto';
 
-const DEFAULT_FREE_USAGE_COUNT = 10;
+const DEFAULT_FREE_USAGE_COUNT = 5;
 
 @Injectable()
 export class UsersService {
@@ -126,6 +126,49 @@ export class UsersService {
     }
   }
 
+  /**
+   * @desc 获取用户剩余的聊天次数
+   */
+  async getUserUsageCount(userId: string): Promise<number> {
+    try {
+      const user = await this.userModel.findOne({ where: { id: userId } });
+
+      if (!user) {
+        this.logger.log(`getUserUsageCount: ${userId} not found, return 0`);
+        return 0
+      }
+
+      if (user.isVip) {
+        // 会员用户无限次
+        this.logger.log(`getUserUsageCount: ${userId} is vip, return 999`);
+        return 999
+      }
+
+      this.logger.log(`getUserUsageCount: ${userId} freeUsageCount: ${user.freeUsageCount}`);
+
+      return user.freeUsageCount || 0;
+    } catch (error) {
+      this.logger.error(`getUserUsageCount error: ${error instanceof Error ? error.message : String(error)}`);
+      return 0
+    }
+  }
+
+  // 扣减用户免费次数
+  async deductUserUsageCount(userId: string, count: number = 1): Promise<void> {
+    try {
+      this.logger.log(`deductUserUsageCount: ${userId} deduct ${count} times`);
+      const user = await this.userModel.findOne({ where: { id: userId } });
+      if (!user) {
+        throw new NotFoundException(`ID为${userId}的用户不存在`);
+      }
+      user.freeUsageCount -= count;
+      await user.save();
+    } catch (error) {
+      this.logger.error(`deductUserUsageCount error: ${error instanceof Error ? error.message : String(error)}`);
+      throw error;
+    }
+  }
+
 
   // 更新用户昵称、头像
   async updateUser(updateUserDto: UpdateUserDto): Promise<UpdateUserResponseDto> {