import express from 'express';
import cors from 'cors';
import { runOttoCrawler } from './src/otto-crawler.js';
import { runAmazonCrawler } from './src/amazon-crawler.js';
import { ProductData } from './src/productData.js';
import { log } from 'crawlee';

const app = express();
const PORT = process.env.PORT || 7860;

// ==================== 爬虫映射表 ====================

/**
 * 支持的爬虫源类型
 */
type CrawlerPlatform = 'Otto' | 'Amazon';

/**
 * 爬虫函数映射表
 */
const crawlerMap: Record<CrawlerPlatform, (urls: string[], options?: any) => Promise<ProductData[]>> = {
  'Otto': runOttoCrawler,
  'Amazon': runAmazonCrawler
};

// ==================== Express 中间件配置 ====================

app.use(cors());
app.use(express.json({ limit: '10mb' }));

// 1. 健康检查接口
app.get('/health', (req, res) => {
  res.json({ 
    status: 'ok', 
    service: 'smart-search-crawler',
    timestamp: new Date().toISOString(),
    supportedPlatforms: Object.keys(crawlerMap)
  });
});

// 2. 执行爬取任务接口
app.post('/crawl', async (req, res) => {
  try {
    const { platform, urls, preset = 'stable' } = req.body;

    // 参数验证
    if (!platform || typeof platform !== 'string') {
      return res.status(400).json({ 
        success: false, 
        error: '请提供有效的 platform 参数 (例如: "Otto")' 
      });
    }

    if (!urls || !Array.isArray(urls) || urls.length === 0) {
      return res.status(400).json({ 
        success: false, 
        error: '请提供有效的 URL 数组 (urls)' 
      });
    }

    // 检查是否支持该源
    if (!(platform in crawlerMap)) {
      return res.status(400).json({ 
        success: false, 
        error: `不支持的爬虫源: ${platform}。支持的源: ${Object.keys(crawlerMap).join(', ')}` 
      });
    }

    log.info(`[API] 收到爬取请求: platform=${platform}, ${urls.length} 个 URL, preset=${preset}`);

    // 根据 platform 选择对应的爬虫执行
    const crawler = crawlerMap[platform as CrawlerPlatform];
    const results: ProductData[] = await crawler(urls, { preset });

    res.json({
      success: true,
      platform: platform,
      count: results.length,
      data: results
    });

  } catch (error: any) {
    log.error('[API] 爬取任务执行失败:', error.message);
    res.status(500).json({
      success: false,
      error: error.message
    });
  }
});

// 启动服务
app.listen(PORT, () => {
  console.log(`\n🚀 Smart Search Crawler API is running on http://localhost:${PORT}`);
  console.log(`   - Health:  GET  http://localhost:${PORT}/health`);
  console.log(`   - Crawl:   POST http://localhost:${PORT}/crawl`);
  console.log(`   - Supported Platforms: ${Object.keys(crawlerMap).join(', ')}`);
  console.log('');
});