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

/**
 * [BIZ_PROD_12] AI 商品全自动“清洗”与本地化服务
 * @description 核心逻辑：语义清洗（过滤敏感词/Logo）、多模态增强（生成本地化营销素材）
 */
export class ProductWasherService {
  private static readonly TABLE_NAME = 'cf_product';

  /**
   * 执行全自动清洗任务
   * @param productId 数据库记录 ID
   * @param targetRegion 目标市场 (如: 'MIDDLE_EAST', 'SEA')
   */
  static async washAndLocalize(productId: number, targetRegion: string) {
    logger.info(`[ProductWasher] Starting wash for Product: ${productId}, Region: ${targetRegion}`);

    const product = await db(this.TABLE_NAME).where({ id: productId }).first();
    if (!product) return;

    try {
      // 1. 语义清洗 (Listing Cleaning)
      const cleanedTitle = await this.cleanTitle(product.originalTitle || product.title);
      const localizedDescription = await this.generateLocalizedDescription(product.title, targetRegion);

      // 2. 图像清洗与本地化增强 (Image Localization)
      // 模拟调用 VisionFactoryService 进行素材生成
      const enhancedMainImage = await VisionFactoryService.generateMarketingImage({
        originalImageUrl: product.mainImage,
        productTitle: product.title,
        targetMarket: targetRegion,
        aestheticStyle: targetRegion === 'MIDDLE_EAST' ? 'GOLDEN_LUXURY' : 'MINIMALIST'
      });

      // 3. 更新产品数据
      await db(this.TABLE_NAME).where({ id: productId }).update({
        title: cleanedTitle,
        attributes: JSON.stringify({
          ...product.attributes,
          localized_description: localizedDescription,
          wash_region: targetRegion,
          washed_at: new Date()
        }),
        mainImage: enhancedMainImage,
        updated_at: db.fn.now()
      });

      logger.info(`[ProductWasher] Product ${productId} washed and localized for ${targetRegion}`);
    } catch (err: any) {
      logger.error(`[ProductWasher] Washing failed: ${err.message}`);
      throw err;
    }
  }

  /**
   * 清洗标题：过滤非法字符、品牌 Logo 词及冗余词
   */
  private static async cleanTitle(originalTitle: string): Promise<string> {
    // 实际生产中应调用 AIService (LLM) 进行精细化改写
    // 这里采用正则模拟
    let cleaned = originalTitle.replace(/(official|original|brand|logo|guaranteed)/gi, '');
    cleaned = cleaned.replace(/[^\w\s\u4e00-\u9fa5]/g, '').trim();
    return cleaned;
  }

  /**
   * 生成本地化描述
   */
  private static async generateLocalizedDescription(title: string, region: string): Promise<string> {
    // 模拟 LLM 生成符合当地文化语境的文案
    const regionContext: Record<string, string> = {
      'MIDDLE_EAST': 'Designed for elegance and durability in arid climates.',
      'SEA': 'Lightweight and breathable, perfect for tropical humidity.',
      'DEFAULT': 'Premium quality product for global trade.'
    };
    
    return `${title}. ${regionContext[region] || regionContext['DEFAULT']}`;
  }
}
