# All files / modules/ai/services ai.service.ts

52.38% Statements 33/63
20% Branches 2/10
88.88% Functions 8/9
51.66% Lines 31/60

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     import { Injectable, Logger, BadRequestException, NotFoundException } from '@nestjs/common';
    import { InjectRepository } from '@nestjs/typeorm';
    import { Repository, MoreThanOrEqual } from 'typeorm';
    import { AIConfig, AIUsage, UsageStatus, AIProvider } from '../entities';
    import { OpenRouterClient } from '../clients';
    import {
      ChatRequestDto,
      ChatResponseDto,
      UpdateAIConfigDto,
      UsageStatsDto,
      AIModelDto,
    } from '../dto';

    @Injectable()
    export class AIService {
      private readonly logger = new Logger(AIService.name);

      constructor(
        @InjectRepository(AIConfig)
        private readonly configRepository: Repository<AIConfig>,
        @InjectRepository(AIUsage)
        private readonly usageRepository: Repository<AIUsage>,
        private readonly openRouterClient: OpenRouterClient,
      ) {}

      // ==================== Configuration ====================

      async getConfig(tenantId: string): Promise<AIConfig> {
        let config = await this.configRepository.findOne({
          where: { tenant_id: tenantId },
        });

        // Create default config if not exists
        if (!config) {
          config = this.configRepository.create({
            tenant_id: tenantId,
            provider: AIProvider.OPENROUTER,
            default_model: 'anthropic/claude-3-haiku',
            temperature: 0.7,
            max_tokens: 2048,
            is_enabled: true,
          });
          await this.configRepository.save(config);
        }

        return config;
      }

      async updateConfig(tenantId: string, dto: UpdateAIConfigDto): Promise<AIConfig> {
        let config = await this.getConfig(tenantId);

        // Update fields
        Object.assign(config, dto);
        config.updated_at = new Date();

        return this.configRepository.save(config);
      }

      // ==================== Chat Completion ====================

      async chat(
        tenantId: string,
        userId: string,
        dto: ChatRequestDto,
      ): Promise<ChatResponseDto> {
        const config = await this.getConfig(tenantId);

        if (!config.is_enabled) {
          throw new BadRequestException('AI features are disabled for this tenant');
        }

        Iif (!this.openRouterClient.isReady()) {
          throw new BadRequestException('AI service is not configured');
        }

        // Create usage record
        const usage = this.usageRepository.create({
          tenant_id: tenantId,
          user_id: userId,
          provider: config.provider,
          model: dto.model || config.default_model,
          status: UsageStatus.PENDING,
          started_at: new Date(),
        });
        await this.usageRepository.save(usage);

        try {
          // Apply system prompt if configured and not provided
          let messages = [...dto.messages];
          Iif (config.system_prompt && !messages.some((m) => m.role === 'system')) {
            messages = [{ role: 'system', content: config.system_prompt }, ...messages];
          }

          const startTime = Date.now();

          const response = await this.openRouterClient.chatCompletion(
            { ...dto, messages },
            config.default_model,
            config.temperature,
            config.max_tokens,
          );

          const latencyMs = Date.now() - startTime;

          // Calculate costs
          const costs = this.openRouterClient.calculateCost(
            response.model,
            response.usage.prompt_tokens,
            response.usage.completion_tokens,
          );

          // Update usage record
          usage.status = UsageStatus.COMPLETED;
          usage.model = response.model;
          usage.input_tokens = response.usage.prompt_tokens;
          usage.output_tokens = response.usage.completion_tokens;
          usage.cost_input = costs.input;
          usage.cost_output = costs.output;
          usage.latency_ms = latencyMs;
          usage.completed_at = new Date();
          usage.request_id = response.id;
          usage.endpoint = 'chat';
          await this.usageRepository.save(usage);

          return response;
        } catch (error) {
          // Record failure
          usage.status = UsageStatus.FAILED;
          usage.error_message = error.message;
          usage.completed_at = new Date();
          await this.usageRepository.save(usage);

          throw error;
        }
      }

      // ==================== Models ====================

      async getModels(): Promise<AIModelDto[]> {
        return this.openRouterClient.getModels();
      }

      // ==================== Usage Stats ====================

      async getCurrentMonthUsage(tenantId: string): Promise<UsageStatsDto> {
        const startOfMonth = new Date();
        startOfMonth.setDate(1);
        startOfMonth.setHours(0, 0, 0, 0);

        const result = await this.usageRepository
          .createQueryBuilder('usage')
          .select('COUNT(*)', 'request_count')
          .addSelect('COALESCE(SUM(usage.input_tokens), 0)', 'total_input_tokens')
          .addSelect('COALESCE(SUM(usage.output_tokens), 0)', 'total_output_tokens')
          .addSelect('COALESCE(SUM(usage.input_tokens + usage.output_tokens), 0)', 'total_tokens')
          .addSelect('COALESCE(SUM(usage.cost_input + usage.cost_output), 0)', 'total_cost')
          .addSelect('COALESCE(AVG(usage.latency_ms), 0)', 'avg_latency_ms')
          .where('usage.tenant_id = :tenantId', { tenantId })
          .andWhere('usage.status = :status', { status: UsageStatus.COMPLETED })
          .andWhere('usage.created_at >= :startOfMonth', { startOfMonth })
          .getRawOne();

        return {
          request_count: parseInt(result.request_count, 10),
          total_input_tokens: parseInt(result.total_input_tokens, 10),
          total_output_tokens: parseInt(result.total_output_tokens, 10),
          total_tokens: parseInt(result.total_tokens, 10),
          total_cost: parseFloat(result.total_cost),
          avg_latency_ms: parseFloat(result.avg_latency_ms),
        };
      }

      async getUsageHistory(
        tenantId: string,
        page = 1,
        limit = 20,
      ): Promise<{ data: AIUsage[]; total: number }> {
        const [data, total] = await this.usageRepository.findAndCount({
          where: { tenant_id: tenantId },
          order: { created_at: 'DESC' },
          skip: (page - 1) * limit,
          take: limit,
        });

        return { data, total };
      }

      // ==================== Health Check ====================

      isServiceReady(): boolean {
        return this.openRouterClient.isReady();
      }
    }