import db from '../../config/database';
import { logger } from '../../utils/logger';
import { WebhookService } from '../../core/integrations/WebhookService';

export interface AdCampaign {
  id: string;
  tenantId: string;
  productId: string;
  platform: 'FACEBOOK' | 'TIKTOK' | 'GOOGLE' | 'AMAZON';
  dailyBudget: number;
  cpaLimit: number;
  status: 'ACTIVE' | 'PAUSED_STOCK' | 'PAUSED_ROI' | 'PAUSED_STOPLOSS';
}

/**
 * [BIZ_AUTO_02] 自动化广告投放机器人 (Auto-Ads Bot)
 * @description 核心逻辑：基于实时 ROI 与库存数据自动优化广告预算与状态
 */
export class AdAutoService {
  private static readonly TABLE_NAME = 'cf_ad_campaigns';

  /**
   * 监控并优化广告组
   */
  static async monitorAndOptimize(tenantId: string, productId: string): Promise<void> {
    const campaign = await db(this.TABLE_NAME).where({ tenant_id: tenantId, product_id: productId }).first();
    if (!campaign || campaign.status === 'PAUSED_ROI') return;

    // 1. 检查库存状况 (Orchestrate with Inventory)
    const stock = await db('cf_skus').where({ product_id: productId }).sum('stock as total').first();
    const totalStock = stock?.total || 0;
    if (totalStock <= 5 && campaign.status === 'ACTIVE') {
      logger.warn(`[AutoAds] Low stock (${totalStock}) for Product ${productId}. Pausing ads.`);
      await this.updateStatus(campaign.id, 'PAUSED_STOCK', 'Low inventory safety threshold reached.');
      return;
    }

    // 2. 跨平台 ROI 审计与自动止损 (Multi-Platform Stop-Loss)
    const stats = await this.getCrossPlatformStats(campaign.id, campaign.platform);
    
    if (stats.roi < 1.2 && stats.spend > 50 && campaign.status === 'ACTIVE') {
      logger.error(`[AutoAds] ROI ${stats.roi} below threshold for Campaign ${campaign.id} on ${campaign.platform}. STOP LOSS TRIGGERED.`);
      await this.updateStatus(campaign.id, 'PAUSED_ROI', `Stop-loss: ROI ${stats.roi} < 1.2 after $${stats.spend} spend.`);
      
      // 联动 API 真正执行停止
      await this.callPlatformAPI(campaign.platform, 'PAUSE_CAMPAIGN', campaign.id);
    }
  }

  /**
   * 模拟调用跨平台广告 API
   */
  private static async getCrossPlatformStats(campaignId: string, platform: string) {
    // 模拟根据平台获取实时消耗与 ROI
    return {
      roi: Math.random() * 2,
      spend: Math.random() * 200,
      conversions: Math.floor(Math.random() * 10)
    };
  }

  private static async callPlatformAPI(platform: string, action: string, campaignId: string) {
    logger.info(`[AutoAds] [EXTERNAL_API] ${platform} -> Executing ${action} for ${campaignId}`);
    // 实际应调用 Amazon Ads API / TikTok Marketing API
  }

  /**
   * 更新广告状态并触发通知
   */
  private static async updateStatus(campaignId: string, status: AdCampaign['status'], reason: string) {
    await db(this.TABLE_NAME).where({ id: campaignId }).update({
      status,
      updated_at: new Date()
    });

    // 触发 Webhook 告知租户
    const campaign = await db(this.TABLE_NAME).where({ id: campaignId }).first();
    await WebhookService.trigger({
      tenantId: campaign.tenant_id,
      eventType: 'TASK_FAILED', // 借用作为策略预警
      payload: {
        type: 'AD_AUTO_ACTION',
        campaignId,
        status,
        reason
      },
      traceId: `ads-${Date.now()}`,
      timestamp: Date.now()
    });
  }

  /**
   * 初始化广告计划
   */
  static async createCampaign(data: Omit<AdCampaign, 'status'>) {
    await db(this.TABLE_NAME).insert({
      ...data,
      status: 'ACTIVE',
      created_at: new Date(),
      updated_at: new Date()
    });
  }
}
