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

export interface ScriptRequest {
  tenantId: string;
  productId: string;
  durationMinutes: number;
  platform: 'TIKTOK' | 'SHOPEE' | 'LAZADA';
}

/**
 * [BIZ_MKT_03] AI 直播剧本自动生成服务
 * @description 结合商品卖点与实时流行趋势，生成针对东南亚/欧美市场的直播带货脚本
 */
export class LiveScriptService {
  /**
   * 生成直播脚本 (BIZ_MKT_03)
   */
  static async generateScript(req: ScriptRequest): Promise<any> {
    logger.info(`[LiveScript] Generating ${req.durationMinutes}min script for Product: ${req.productId} on ${req.platform}`);

    const product = await db('cf_product').where({ id: req.productId }).first();
    if (!product) throw new Error('Product not found');

    // 1. 模拟 AI 脚本生成 (实际中应集成多模态 LLM)
    const script = this.mockScriptGen(product.title, req.platform, req.durationMinutes);

    return {
      productId: req.productId,
      platform: req.platform,
      totalDuration: `${req.durationMinutes} Minutes`,
      segments: script,
      suggestedProps: ['Green screen background', 'Product demo unit', 'Ring light']
    };
  }

  private static mockScriptGen(title: string, platform: string, duration: number): any[] {
    return [
      { timestamp: "00:00 - 02:00", action: "Hook & Greeting", content: `Welcome back everyone! Today we have something special: ${title}!` },
      { timestamp: "02:00 - 05:00", action: "Problem & Solution", content: "Are you tired of common issues? This product solves them all." },
      { timestamp: "05:00 - 10:00", action: "Live Demo", content: "Watch how easily this works. Real-time testing right now!" },
      { timestamp: "10:00 - End", action: "Limited Offer & CTA", content: "Only 50 units left at this price! Click the link in bio!" }
    ];
  }
}
