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

export interface CreativeRequest {
  tenantId: string;
  productId: string;
  platform: 'FB' | 'TIKTOK' | 'IG';
  style: 'PROFESSIONAL' | 'CASUAL' | 'URGENT';
}

/**
 * [BIZ_MKT_04] AI 广告素材自动生成 API
 * @description 调用多模态 AI 模型为商品生成针对不同平台的广告文案与脚本
 */
export class AdCreativeService {
  /**
   * 生成广告素材 (BIZ_MKT_04)
   */
  static async generateCreative(req: CreativeRequest): Promise<any> {
    logger.info(`[AdCreative] Generating ${req.platform} creative for Product: ${req.productId}`);

    // 1. 获取商品基础信息
    const product = await db('cf_product').where({ id: req.productId }).first();
    if (!product) throw new Error('Product not found');

    // 2. 模拟 AI 生成逻辑 (实际中应集成 LLM)
    const adCopy = this.mockAiGen(product.title, req.platform, req.style);

    return {
      productId: req.productId,
      platform: req.platform,
      adCopy,
      hook: "Don't miss out on this deal!",
      cta: "Shop Now"
    };
  }

  private static mockAiGen(title: string, platform: string, style: string): string {
    if (platform === 'TIKTOK') {
      return `🔥 Trending Now: ${title}! Get yours before it's gone! #viral #shop`;
    }
    return `Special Offer: High-quality ${title} available now. Free shipping on orders over $50.`;
  }
}