import db from '../config/database';
import { logger } from '../utils/logger';
import { AdviceService } from '../domains/Strategy/AdviceService';

export interface SocialTrend {
  keyword: string;
  platform: 'TikTok' | 'Instagram' | 'Pinterest';
  growthRate: number; // 增长率
  mentions: number; // 提及次数
  relatedProducts: string[];
}

/**
 * [BIZ_MKT_05] 基于社交热点趋势的爆款选品建议引擎
 * @description 采集并分析社交媒体热词、标签及爆款视频，结合 AI 预测品类爆发点并推荐货源
 */
export class SocialTrendSourcingService {
  /**
   * 发现并处理社交趋势 (BIZ_MKT_05)
   */
  static async discoverTrends(tenantId: string): Promise<void> {
    logger.info(`[SocialTrend] Discovering trends for Tenant: ${tenantId}`);

    // 1. 模拟采集社交热点数据 (实际中应集成外部 API 或爬虫)
    const trends = await this.mockCollectTrends();

    for (const trend of trends) {
      // 2. 识别高增长热词
      if (trend.growthRate > 0.5) {
        logger.info(`[SocialTrend] High growth trend detected: ${trend.keyword} (+${(trend.growthRate * 100).toFixed(0)}%)`);

        // 3. 自动触发策略建议 (BIZ_AI_16-EXT)
        await AdviceService.recordAdvice({
          tenantId,
          shopId: 'DEFAULT',
          traceId: `TREND-${Date.now()}`,
          insight: {
            type: 'ARBITRAGE',
            title: `Social Trend Alert: ${trend.keyword}`,
            description: `The keyword "${trend.keyword}" is trending on ${trend.platform} with a ${ (trend.growthRate * 100).toFixed(0) }% growth rate. Potential for arbitrage.`,
            impact: 'high',
            confidence: 0.88,
            suggestedAction: `Source products related to "${trend.keyword}" from 1688 and test on Shopify.`,
            metadata: { keyword: trend.keyword, platform: trend.platform, growthRate: trend.growthRate, mentions: trend.mentions }
          }
        });
      }
    }
  }

  private static async mockCollectTrends(): Promise<SocialTrend[]> {
    return [
      { keyword: 'portable_espresso_maker', platform: 'TikTok', growthRate: 0.65, mentions: 12500, relatedProducts: [] },
      { keyword: 'ergonomic_office_chair', platform: 'Instagram', growthRate: 0.2, mentions: 5400, relatedProducts: [] },
      { keyword: 'smart_home_fragrance', platform: 'TikTok', growthRate: 0.8, mentions: 8900, relatedProducts: [] }
    ];
  }
}