const express = require('express');
const path = require('path');

const app = express();
const PORT = 3000;

// Middleware
app.use(express.json());
app.use(express.static(path.join(__dirname, 'public')));

// API: 搜索优惠券 (预留淘宝/京东联盟API接入点)
app.get('/api/search', async (req, res) => {
  const { keyword } = req.query;
  if (!keyword) {
    return res.json({ success: false, message: '请输入搜索关键词' });
  }

  // TODO: 接入淘宝联盟API / 京东联盟API
  // 目前返回模拟数据用于本地验证
  const mockResults = generateMockResults(keyword);
  res.json({ success: true, data: mockResults });
});

// API: 今日特价
app.get('/api/today-deals', (req, res) => {
  // TODO: 接入真实特价API
  const deals = generateMockDeals();
  res.json({ success: true, data: deals });
});

// API: 线报广场
app.get('/api/linbao', (req, res) => {
  // TODO: 接入线报数据源
  const linbao = generateMockLinbao();
  res.json({ success: true, data: linbao });
});

// API: 历史价格查询 (预留)
app.get('/api/price-history', (req, res) => {
  const { itemid } = req.query;
  // TODO: 接入价格监控服务
  res.json({
    success: true,
    data: {
      itemid,
      history: [
        { date: '2026-05-01', price: 89 },
        { date: '2026-05-15', price: 85 },
        { date: '2026-05-28', price: 79 },
        { date: '2026-06-01', price: 75 },
        { date: '2026-06-04', price: 72 }
      ],
      lowest: { price: 72, date: '2026-06-04' }
    }
  });
});

// Serve main page
app.get('/', (req, res) => {
  res.sendFile(path.join(__dirname, 'public', 'index.html'));
});

// Mock data generators
function generateMockResults(keyword) {
  return [
    {
      id: '1',
      title: `苏泊尔空气炸锅5.5L大容量${keyword}智能款`,
      price: 189,
      originalPrice: 399,
      coupon: 60,
      commission: 15,
      shop: '苏泊尔官方旗舰店',
      link: 'https://s.click.taobao.com/abc123',
      platform: 'taobao',
      img: 'https://img.alicdn.com/bao/uploaded/O1CN01Z1a2b3_!!600000000.jpg'
    },
    {
      id: '2',
      title: `九阳破壁机L12-Y5多功能全自动${keyword}`,
      price: 299,
      originalPrice: 699,
      coupon: 100,
      commission: 25,
      shop: '九阳厨房电器旗舰店',
      link: 'https://s.click.taobao.com/def456',
      platform: 'taobao',
      img: 'https://img.alicdn.com/bao/uploaded/O1CN01C3d4e5_!!600000000.jpg'
    },
    {
      id: '3',
      title: `美的${keyword}电饭煲MB-RE476智能预约`,
      price: 159,
      originalPrice: 399,
      coupon: 50,
      commission: 12,
      shop: '美的官方旗舰店',
      link: 'https://u.jd.com/gh789',
      platform: 'jd',
      img: 'https://img.alicdn.com/bao/uploaded/O1CN01F6h7i8_!!600000000.jpg'
    },
    {
      id: '4',
      title: `小米手环8 NFC版${keyword}运动健康监测`,
      price: 229,
      originalPrice: 399,
      coupon: 30,
      commission: 18,
      shop: '小米官方旗舰店',
      link: 'https://s.click.taobao.com/jkl012',
      platform: 'taobao',
      img: 'https://img.alicdn.com/bao/uploaded/O1CN01G8m9n0_!!600000000.jpg'
    }
  ];
}

function generateMockDeals() {
  return [
    { id: 'd1', title: '苏泊尔空气炸锅5.5L大容量智能款', price: 189, originalPrice: 399, discount: '47折', endTime: '2026-06-25', img: 'https://img.alicdn.com/bao/uploaded/O1CN01abc123_!!600000000.jpg', platform: 'taobao', commission: 15 },
    { id: 'd2', title: '九阳破壁机L12-Y536多功能全自动', price: 299, originalPrice: 699, discount: '43折', endTime: '2026-06-25', img: 'https://img.alicdn.com/bao/uploaded/O1CN01def456_!!600000000.jpg', platform: 'taobao', commission: 25 },
    { id: 'd3', title: '美的电饭煲MB-RE476智能预约', price: 159, originalPrice: 399, discount: '40折', endTime: '2026-06-23', img: 'https://img.alicdn.com/bao/uploaded/O1CN01ghi789_!!600000000.jpg', platform: 'jd', commission: 12 },
    { id: 'd4', title: '小米手环8 NFC版运动健康', price: 229, originalPrice: 399, discount: '57折', endTime: '2026-06-26', img: 'https://img.alicdn.com/bao/uploaded/O1CN01jkl012_!!600000000.jpg', platform: 'taobao', commission: 18 },
    { id: 'd5', title: '戴森吹风机HD15负离子护发', price: 2199, originalPrice: 3299, discount: '67折', endTime: '2026-06-28', img: 'https://img.alicdn.com/bao/uploaded/O1CN01mno345_!!600000000.jpg', platform: 'taobao', commission: 180 },
    { id: 'd6', title: '添可洗地机2.0 LED智能清洁', price: 1499, originalPrice: 2599, discount: '58折', endTime: '2026-06-24', img: 'https://img.alicdn.com/bao/uploaded/O1CN01pqr678_!!600000000.jpg', platform: 'jd', commission: 120 }
  ];
}

function generateMockLinbao() {
  return [
    { id: 'l1', title: '🎉 淘宝618预售开启！付定金可抵双倍，AirPods Pro低至999', source: '官方公告', time: '10分钟前', hot: 98, url: 'https://taobao.com' },
    { id: 'l2', title: '🔥 京东PLUS会员专属大额券，500-50全场通用', source: '京东', time: '30分钟前', hot: 92, url: 'https://jd.com' },
    { id: 'l3', title: '💰 美团外卖新用户首单立减15元，红包秒到账', source: '美团', time: '1小时前', hot: 85, url: 'https://meituan.com' },
    { id: 'l4', title: '🛒 拼多多百亿补贴再加码，iPhone15 Pro Max直降500', source: '拼多多', time: '2小时前', hot: 95, url: 'https://pinduoduo.com' },
    { id: 'l5', title: '⏰ 饿了么端午粽子专场，满39减10', source: '饿了么', time: '3小时前', hot: 78, url: 'https://elem.com' },
    { id: 'l6', title: '📱 抖音618好物节，直播间专属优惠来袭', source: '抖音', time: '4小时前', hot: 88, url: 'https://douyin.com' }
  ];
}

app.listen(PORT, () => {
  console.log(`智币省 服务已启动: http://localhost:${PORT}`);
  console.log(`API端点:`);
  console.log(`  - GET /api/search?keyword=xxx 搜索优惠券`);
  console.log(`  - GET /api/today-deals 今日特价`);
  console.log(`  - GET /api/linbao 线报广场`);
  console.log(`  - GET /api/price-history?itemid=xxx 历史价格`);
});