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

export interface Influencer {
  id: string;
  tenantId: string;
  platform: 'TIKTOK' | 'IG' | 'YT';
  handle: string;
  followerCount: number;
  category: string;
  engagementRate: number;
}

/**
 * [BIZ_MKT_02] 红人营销自动邀约机器人
 * @description 实现基于产品画像的 KOL 自动筛选与初步邀约文案生成
 */
export class InfluencerBotService {
  private static readonly TABLE_NAME = 'cf_influencers';

  /**
   * 自动筛选并邀约红人 (BIZ_MKT_02)
   */
  static async discoverAndInvite(tenantId: string, productCategory: string): Promise<void> {
    logger.info(`[InfluencerBot] Discovering influencers for Category: ${productCategory}`);

    // 1. 模拟筛选符合品类的红人 (实际中应集成第三方数据 API)
    const discovered = await this.mockDiscover(productCategory);

    for (const inf of discovered) {
      // 2. 存入待邀约列表
      await db(this.TABLE_NAME).insert({
        id: inf.id,
        tenant_id: tenantId,
        platform: inf.platform,
        handle: inf.handle,
        follower_count: inf.followerCount,
        category: inf.category,
        engagement_rate: inf.engagementRate,
        outreach_status: 'DISCOVERED',
        created_at: new Date(),
        updated_at: new Date()
      });

      // 3. 生成并发送邀约文案 (BIZ_MKT_02)
      const message = this.generateOutreachMessage(inf.handle, productCategory);
      await this.sendMockMessage(inf.handle, message);

      // 4. 更新状态
      await db(this.TABLE_NAME).where({ id: inf.id }).update({
        outreach_status: 'INVITED',
        updated_at: new Date()
      });
    }
  }

  private static generateOutreachMessage(handle: string, category: string): string {
    return `Hi @${handle}, we love your content about ${category}! We'd like to send you some of our new products for a potential collaboration. Are you interested?`;
  }

  private static async sendMockMessage(handle: string, message: string): Promise<void> {
    logger.info(`[InfluencerBot] [API_CALL] Sent invitation to @${handle}: ${message}`);
  }

  private static async mockDiscover(category: string): Promise<Influencer[]> {
    return [
      { id: `INF-${Date.now()}-1`, tenantId: '', platform: 'TIKTOK', handle: 'fashion_queen', followerCount: 150000, category, engagementRate: 0.045 },
      { id: `INF-${Date.now()}-2`, tenantId: '', platform: 'IG', handle: 'tech_guru', followerCount: 85000, category, engagementRate: 0.032 }
    ];
  }
}
