const express = require('express');
const { getDB } = require('../database');
const { auth, adminAuth } = require('../middleware/auth');

const router = express.Router();

/**
 * @swagger
 * /api/products:
 *   get:
 *     summary: 获取商品列表
 *     description: 返回商品列表，支持分页、搜索、分类、状态过滤
 *     tags: [products]
 *     parameters:
 *       - in: query
 *         name: page
 *         schema:
 *           type: integer
 *         description: 页码，默认1
 *       - in: query
 *         name: limit
 *         schema:
 *           type: integer
 *         description: 每页数量，默认10，最大100
 *       - in: query
 *         name: search
 *         schema:
 *           type: string
 *         description: 搜索商品名称
 *       - in: query
 *         name: category
 *         schema:
 *           type: string
 *         description: 分类名称
 *       - in: query
 *         name: status
 *         schema:
 *           type: string
 *         description: 商品状态（active/inactive）
 *     responses:
 *       200:
 *         description: 成功返回商品列表
 *         content:
 *           application/json:
 *             schema:
 *               type: object
 *               properties:
 *                 success:
 *                   type: boolean
 *                   example: true
 *                 data:
 *                   type: array
 *                   items:
 *                     type: object
 *                     properties:
 *                       id:
 *                         type: string
 *                         example: "1"
 *                       name:
 *                         type: string
 *                         example: "商品A"
 *                       rongdou_price:
 *                         type: number
 *                         example: 100
 *                       points_price:
 *                         type: number
 *                         example: 1000
 *                       stock:
 *                         type: integer
 *                         example: 100
 *                       image:
 *                         type: string
 *                         example: "https://example.com/image.jpg"
 *                       description:
 *                         type: string
 *                         example: "这是一个商品"
 *                       status:
 *                         type: string
 *                         example: "active"
 *                       category_id:
 *                         type: string
 *                         example: "1"
 *                       created_at:
 *                         type: string
 *                         format: date-time
 *                         example: "2023-01-01T00:00:00Z"
 *                       updated_at:
 *                         type: string
 *                         format: date-time
 *                         example: "2023-01-01T00:00:00Z"
 *                       sales:
 *                         type: integer
 *                         example: 100
 *                       images:
 *                         type: array
 *                         items:
 *                           type: string
 *                           example: "https://example.com/image.jpg"
 *     400:
 *       description: 无效的分页参数
 *     500:
 *       description: 服务器内部错误
 */
// 商品管理路由
router.get('/', async (req, res) => {
  try {
    const { page = 1, limit = 10, search = '', category = '', status = '' } = req.query;
    
    // 确保参数为有效数字
    const pageNum = Math.max(1, parseInt(page) || 1);
    const limitNum = Math.max(1, Math.min(100, parseInt(limit) || 10)); // 限制最大100条
    const offset = Math.max(0, (pageNum - 1) * limitNum);
    let filteredProducts = []
    
    console.log('分页参数:', { pageNum, limitNum, offset, search, category, status });
    
    let whereClause = 'WHERE 1=1';
    const params = [];
    
    if (search) {
      whereClause += ' AND name LIKE ?';
      params.push(`%${search}%`);
    }
    
    if (status) {
      whereClause += ' AND status = ?';
      params.push(status);
    } else {
      whereClause += ' AND status = "active"';
    }
    
    // 获取总数
    const countQuery = `SELECT COUNT(*) as total FROM products ${whereClause}`;
    const [countResult] = await getDB().execute(countQuery, params);
    const total = countResult[0].total;
    
    // 获取商品列表
    const query = `
      SELECT id, name, rongdou_price, points_price, stock, image_url as image, description, status, payment_methods, created_at, updated_at, sales, images
      FROM products 
      ${whereClause}
      ORDER BY created_at DESC
      LIMIT ${limitNum} OFFSET ${offset}
    `;
    
    // 确保参数数组正确传递
    const queryParams = [...params];
    console.log('Query params:', queryParams, 'Query:', query);
    const [products] = await getDB().execute(query, queryParams);

    products.forEach(item=>{
      item.payment_methods = JSON.parse(item.payment_methods)
      item.images = JSON.parse(item.images)
    })


    if (category) {
      // 先根据分类名称获取分类ID
      const query = `SELECT * FROM category WHERE category_name = ?`
      const [getCategory] = await getDB().execute(query, [category])
      const [getSecondCategory] = await getDB().execute('SELECT * FROM category WHERE parent_id = ?', [getCategory[0].id])

      const sumCategory = getCategory.concat(getSecondCategory).map(item=>item.id)

      // 再根据分类ID获取商品ID
      const getProductCategory = []
      for (const item of sumCategory) {
        const [getProductCategoryItem] = await getDB().execute('SELECT * FROM products_category WHERE category_id = ?', [item])
        getProductCategory.push(...getProductCategoryItem)
      }

      const productIds = []
      for (const item of getProductCategory) {
        productIds.push(item.product_id)
      }

      filteredProducts = products.filter(item=>productIds.includes(item.id))
    } else {
      filteredProducts = products
    }

    res.json({
      success: true,
      data: {
        products: filteredProducts,
        // products: products,
        pagination: {
          page: pageNum,
          limit: limitNum,
          total,
          pages: Math.ceil(total / limitNum)
        }
      }
    });
  } catch (error) {
    console.error('获取商品列表失败:', error);
    res.status(500).json({ success: false, message: '获取商品列表失败' });
  }
});

// // 获取商品分类列表
// router.get('/categories', async (req, res) => {
//   try {
//     const [categories] = await getDB().execute(
//       'SELECT DISTINCT category FROM products WHERE status = "active" AND category IS NOT NULL'
//     );
    
//     res.json({
//       success: true,
//       data: {
//         categories: categories.map(item => item.category)
//       }
//     });
//   } catch (error) {
//     console.error('获取商品分类失败:', error);
//     res.status(500).json({ success: false, message: '获取商品分类失败' });
//   }
// });

// 获取热销商品
router.get('/hot', async (req, res) => {
  try {
    // 从活跃商品中随机获取2个商品
    const [products] = await getDB().execute(
      `SELECT id, name, price, points_price, rongdou_price, stock, 
             image_url, images, description, shop_name, shop_avatar, 
             payment_methods, sales, rating, status, created_at, updated_at
       FROM products 
       WHERE status = 'active' AND stock > 0
       ORDER BY sales DESC
       LIMIT 2`
    );
    
    // 格式化商品数据
    const formattedProducts = products.map(product => ({
      ...product,
      images: product.images ? JSON.parse(product.images) : (product.image_url ? [product.image_url] : []),
      payment_methods: product.payment_methods ? JSON.parse(product.payment_methods) : ['points'],
      // 保持向后兼容
      points: product.points_price,
      image: product.image_url
    }));
    
    res.json({
      success: true,
      data: {
        products: formattedProducts
      }
    });
  } catch (error) {
    console.error('获取热销商品失败:', error);
    res.status(500).json({ success: false, message: '获取热销商品失败' });
  }
});

/**
 * @swagger
 * /products/flash-sale:
 *   get:
 *     summary: 获取秒杀商品
 *     tags: [Products]
 *     responses:
 *       200:
 *         description: 成功获取秒杀商品
 *         content:
 *           application/json:
 *             schema:
 *               type: object
 *               properties:
 *                 success:
 *                   type: boolean
 *                 data:
 *                   type: object
 *                   properties:
 *                     products:
 *                       type: array
 *                       items:
 *                         $ref: '#/components/schemas/Product'
 */
router.get('/cheap', async (req, res) => {
  try {

    const [products] = await getDB().execute(
      `SELECT id, start_time, end_time, flash_stock, flash_price, products_id
       FROM flash_product
       WHERE end_time > NOW() AND flash_stock > 0
       ORDER BY RAND() 
       LIMIT 2`
    );

    const tempProducts = await Promise.all(products.map(async item=>{

      const [product] = await getDB().execute(
        `SELECT id, name, price, points_price, rongdou_price, stock, 
               image_url, images, description, shop_name, shop_avatar, 
               payment_methods, sales, rating, status, created_at, updated_at
         FROM products 
         WHERE id = ?`,
        [item.products_id]
      )

      item = {
        ...product[0],
        images: product.images ? JSON.parse(product.images) : (product.image_url ? [product.image_url] : []),
        payment_methods: product.payment_methods ? JSON.parse(product.payment_methods) : ['points'], 
        ...item,
        points: product.points_price,
        image: product.image_url,
        id: product[0].id,
      }
      return item
    }))
    
    res.json({
      success: true,
      data: {
        products: tempProducts
      }
    });
  } catch (error) {
    console.error('获取秒杀商品失败:', error);
    res.status(500).json({ success: false, message: '获取秒杀商品失败' });
  }
});

/**
 * @swagger
 * /products/{id}:
 *   get:
 *     summary: 获取单个商品详情（包含增强规格信息）
 *     tags: [Products]
 *     parameters:
 *       - in: path
 *         name: id
 *         schema:
 *           type: integer
 *         required: true
 *         description: 商品ID
 *     responses:
 *       200:
 *         description: 成功获取商品详情，包含完整的规格信息
 *         content:
 *           application/json:
 *             schema:
 *               type: object
 *               properties:
 *                 success:
 *                   type: boolean
 *                   example: true
 *                 data:
 *                   type: object
 *                   properties:
 *                     product:
 *                       type: object
 *                       properties:
 *                         id:
 *                           type: integer
 *                         name:
 *                           type: string
 *                         category:
 *                           type: string
 *                         price:
 *                           type: number
 *                         points_price:
 *                           type: number
 *                         rongdou_price:
 *                           type: number
 *                         stock:
 *                           type: integer
 *                         specifications:
 *                           type: array
 *                           description: 商品规格组合列表（笛卡尔积规格系统）
 *                           items:
 *                             type: object
 *                             properties:
 *                               id:
 *                                 type: integer
 *                                 description: 规格组合ID
 *                               combination_key:
 *                                 type: string
 *                                 description: 规格组合键（如：1-3-5）
 *                               spec_display:
 *                                 type: string
 *                                 description: 规格显示文本（如：颜色:红色 | 尺寸:XL）
 *                               spec_details:
 *                                 type: array
 *                                 description: 规格详细信息
 *                                 items:
 *                                   type: object
 *                                   properties:
 *                                     id:
 *                                       type: integer
 *                                     spec_name:
 *                                       type: string
 *                                       description: 规格名称
 *                                     spec_display_name:
 *                                       type: string
 *                                       description: 规格显示名称
 *                                     value:
 *                                       type: string
 *                                       description: 规格值
 *                                     display_value:
 *                                       type: string
 *                                       description: 规格显示值
 *                                     color_code:
 *                                       type: string
 *                                       description: 颜色代码
 *                                     image_url:
 *                                       type: string
 *                                       description: 规格图片
 *                               price_adjustment:
 *                                 type: number
 *                                 description: 价格调整
 *                               points_adjustment:
 *                                 type: number
 *                                 description: 积分调整
 *                               rongdou_adjustment:
 *                                 type: number
 *                                 description: 融豆调整
 *                               stock:
 *                                 type: integer
 *                                 description: 规格库存
 *                               sku_code:
 *                                 type: string
 *                                 description: SKU编码
 *                               barcode:
 *                                 type: string
 *                                 description: 条形码
 *                               weight:
 *                                 type: number
 *                                 description: 重量
 *                               volume:
 *                                 type: number
 *                                 description: 体积
 *                               actual_price:
 *                                 type: number
 *                                 description: 实际价格（基础价格+调整）
 *                               actual_points_price:
 *                                 type: number
 *                                 description: 实际积分价格
 *                               actual_rongdou_price:
 *                                 type: number
 *                                 description: 实际融豆价格
 *                               is_available:
 *                                 type: boolean
 *                                 description: 是否有库存
 *                         specification_count:
 *                           type: integer
 *                           description: 规格总数
 *                         available_specifications:
 *                           type: integer
 *                           description: 有库存的规格数量
 *                         attributes:
 *                           type: array
 *                           description: 商品属性
 *                         isFavorited:
 *                           type: boolean
 *                           description: 是否已收藏
 *       404:
 *         description: 商品不存在
 */
router.get('/:id', async (req, res) => {
  try {
    const { id } = req.params;
    const userId = req.user?.id; // 可选的用户ID，用于检查收藏状态
    
    const query = `
      SELECT id, name, price, points_price, rongdou_price, stock, 
             image_url, images, videos, description, details, shop_name, shop_avatar,
             payment_methods, sales, rating, status, created_at, updated_at
      FROM products 
      WHERE id = ? AND status = 'active'
    `;
    
    const [products] = await getDB().execute(query, [id]);
    
    if (products.length === 0) {
      return res.status(404).json({ success: false, message: '商品不存在' });
    }
    
    const product = products[0];
    
    // 获取商品的规格组合（新的笛卡尔积规格系统）
    const [specCombinations] = await getDB().execute(
      `SELECT psc.*, 
             GROUP_CONCAT(CONCAT(sn.display_name, ':', sv.display_value) ORDER BY sn.sort_order SEPARATOR ' | ') as spec_display
       FROM product_spec_combinations psc
       LEFT JOIN JSON_TABLE(psc.spec_values, '$[*]' COLUMNS (spec_value_id INT PATH '$')) jt ON TRUE
       LEFT JOIN spec_values sv ON jt.spec_value_id = sv.id
       LEFT JOIN spec_names sn ON sv.spec_name_id = sn.id
       WHERE psc.product_id = ? AND psc.status = 'active' 
       GROUP BY psc.id
       ORDER BY psc.combination_key`,
      [id]
    );

    // console.log(123,specCombinations);
    
    // 为每个规格组合获取详细的规格值信息
    const enhancedSpecifications = [];
    for (const combination of specCombinations) {
      // 智能解析 spec_values 字段，兼容多种数据格式
      let specValueIds = [];
      try {
        if (combination.spec_values) {
          // 如果是 Buffer 对象，先转换为字符串
          let specValuesStr = combination.spec_values;
          if (Buffer.isBuffer(specValuesStr)) {
            specValuesStr = specValuesStr.toString('utf8');
          }
          
          // 尝试 JSON 解析
          if (typeof specValuesStr === 'string') {
            specValuesStr = specValuesStr.trim();
            if (specValuesStr.startsWith('[') && specValuesStr.endsWith(']')) {
              // JSON 数组格式
              specValueIds = JSON.parse(specValuesStr);
            } else if (specValuesStr.includes(',')) {
              // 逗号分隔的字符串格式
              specValueIds = specValuesStr.split(',').map(id => parseInt(id.trim())).filter(id => !isNaN(id));
            } else if (specValuesStr && !isNaN(parseInt(specValuesStr))) {
              // 单个数字
              specValueIds = [parseInt(specValuesStr)];
            }
          } else if (Array.isArray(specValuesStr)) {
            // 已经是数组
            specValueIds = specValuesStr;
          }
        }
      } catch (parseError) {
        console.warn(`解析规格值失败 (combination_id: ${combination.id}):`, parseError.message);
        specValueIds = [];
      }
      
      // 获取规格值详情
      if (specValueIds && specValueIds.length > 0) {
        const placeholders = specValueIds.map(() => '?').join(',');
        const [specDetails] = await getDB().execute(
          `SELECT sv.*, sn.name as spec_name, sn.display_name as spec_display_name
           FROM spec_values sv
           LEFT JOIN spec_names sn ON sv.spec_name_id = sn.id
           WHERE sv.id IN (${placeholders})
           ORDER BY sn.sort_order, sv.sort_order`,
          specValueIds
        );
        
        enhancedSpecifications.push({
          id: combination.id,
          combination_key: combination.combination_key,
          spec_display: combination.spec_display,
          spec_details: specDetails,
          price_adjustment: combination.price_adjustment || 0,
          points_adjustment: combination.points_adjustment || 0,
          rongdou_adjustment: combination.rongdou_adjustment || 0,
          stock: combination.stock,
          sku_code: combination.sku_code,
          barcode: combination.barcode,
          weight: combination.weight,
          volume: combination.volume,
          actual_price: product.price + (combination.price_adjustment || 0),
          actual_points_price: product.points_price + (combination.points_adjustment || 0),
          actual_rongdou_price: product.rongdou_price + (combination.rongdou_adjustment || 0),
          is_available: combination.stock > 0,
          status: combination.status,
          created_at: combination.created_at,
          updated_at: combination.updated_at
        });
      }
    }

    // console.log(123,enhancedSpecifications);
    
    // 获取商品属性
    const [attributes] = await getDB().execute(
      'SELECT * FROM product_attributes WHERE product_id = ? ORDER BY sort_order, id',
      [id]
    );
    
    // 检查用户是否收藏了该商品
    let isFavorited = false;
    if (userId) {
      const [favorites] = await getDB().execute(
        'SELECT id FROM product_favorites WHERE user_id = ? AND product_id = ?',
        [userId, id]
      );
      isFavorited = favorites.length > 0;
    }
    
    // 构建增强的商品数据
    const enhancedProduct = {
      ...product,
      images: (() => {
        try {
          if (product.images) {
            let imagesStr = product.images;
            if (Buffer.isBuffer(imagesStr)) {
              imagesStr = imagesStr.toString('utf8');
            }
            if (typeof imagesStr === 'string') {
              imagesStr = imagesStr.trim();
              if (imagesStr.startsWith('[') && imagesStr.endsWith(']')) {
                return JSON.parse(imagesStr);
              }
            }
          }
          return product.image_url ? [product.image_url] : [];
        } catch (e) {
          console.warn('解析商品图片失败:', e.message);
          return product.image_url ? [product.image_url] : [];
        }
      })(),
      videos: (() => {
        try {
          if (product.videos) {
            let videosStr = product.videos;
            if (Buffer.isBuffer(videosStr)) {
              videosStr = videosStr.toString('utf8');
            }
            if (typeof videosStr === 'string') {
              videosStr = videosStr.trim();
              if (videosStr.startsWith('[') && videosStr.endsWith(']')) {
                return JSON.parse(videosStr);
              }
            }
          }
          return [];
        } catch (e) {
          console.warn('解析商品视频失败:', e.message);
          return [];
        }
      })(),
      payment_methods: (() => {
        try {
          if (product.payment_methods) {
            let methodsStr = product.payment_methods;
            if (Buffer.isBuffer(methodsStr)) {
              methodsStr = methodsStr.toString('utf8');
            }
            if (typeof methodsStr === 'string') {
              methodsStr = methodsStr.trim();
              if (methodsStr.startsWith('[') && methodsStr.endsWith(']')) {
                return JSON.parse(methodsStr);
              }
            }
          }
          return ['points'];
        } catch (e) {
          console.warn('解析支付方式失败:', e.message);
          return ['points'];
        }
      })(),
      specifications: enhancedSpecifications,
      attributes,
      isFavorited,
      // 规格统计信息
      specification_count: enhancedSpecifications.length,
      available_specifications: enhancedSpecifications.filter(spec => spec.is_available).length,
      // 保持向后兼容
      points: product.points_price,
      image: product.image_url,
      // tags: product.category ? [product.category] : []
    };
    
    res.json({
      success: true,
      data: { product: enhancedProduct }
    });
  } catch (error) {
    console.error('获取商品详情失败:', error);
    res.status(500).json({ success: false, message: '获取商品详情失败' });
  }
});

// 创建商品（管理员权限）
router.post('/', auth, adminAuth, async (req, res) => {
  try {
    const { 
      name, description, price, points_price, rongdou_price = 0, stock, category, 
      image_url, images = [], videos = [], details, status = 'active',
      shop_name, shop_avatar, payment_methods = ['points', 'rongdou', 'points_rongdou'],
      specifications = [], attributes = []
    } = req.body;
    
    if (!name || !price || (!points_price && !rongdou_price) || stock === undefined) {
      return res.status(400).json({ message: '商品名称、原价、积分价格或融豆价格、库存不能为空' });
    }
    
    const [result] = await getDB().execute(
      `INSERT INTO products (name, description, price, points_price, rongdou_price, stock, category, 
       image_url, images, videos, details, shop_name, shop_avatar, payment_methods, status, created_at, updated_at) 
       VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, NOW(), NOW())`,
      [name, description, price, points_price, rongdou_price, stock, category || null, 
       image_url, JSON.stringify(images), JSON.stringify(videos), details, 
       shop_name, shop_avatar, JSON.stringify(payment_methods), status]
    );
    
    const productId = result.insertId;
    

    
    // 添加商品属性
    if (attributes && attributes.length > 0) {
      for (const attr of attributes) {
        await getDB().execute(
          `INSERT INTO product_attributes (product_id, attribute_key, attribute_value, sort_order) 
           VALUES (?, ?, ?, ?)`,
          [productId, attr.key, attr.value, attr.sort_order || 0]
        );
      }
    }
    
    res.status(201).json({
      success: true,
      message: '商品创建成功',
      data: { productId }
    });
  } catch (error) {
    console.error('创建商品错误:', error);
    res.status(500).json({ message: '创建商品失败' });
  }
});

// 更新商品（管理员权限）
router.put('/:id', auth, adminAuth, async (req, res) => {
  try {
    const productId = req.params.id;
    const { 
      name, description, price, points_price, rongdou_price, stock, category, 
      image_url, images, videos, details, status, shop_name, shop_avatar, payment_methods,
      specifications, attributes
    } = req.body;
    
    // 检查商品是否存在
    const [products] = await getDB().execute(
      'SELECT id FROM products WHERE id = ?',
      [productId]
    );
    
    if (products.length === 0) {
      return res.status(404).json({ message: '商品不存在' });
    }
    
    // 构建更新字段
    const updateFields = [];
    const updateValues = [];
    
    if (name) {
      updateFields.push('name = ?');
      updateValues.push(name);
    }
    
    if (description !== undefined) {
      updateFields.push('description = ?');
      updateValues.push(description);
    }
    
    if (price !== undefined) {
      updateFields.push('price = ?');
      updateValues.push(price);
    }
    
    if (points_price !== undefined) {
      updateFields.push('points_price = ?');
      updateValues.push(points_price);
    }
    
    if (rongdou_price !== undefined) {
      updateFields.push('rongdou_price = ?');
      updateValues.push(rongdou_price);
    }
    
    if (stock !== undefined) {
      updateFields.push('stock = ?');
      updateValues.push(stock);
    }
    
    if (category !== undefined) {
      updateFields.push('category = ?');
      updateValues.push(category);
    }
    
    if (image_url !== undefined) {
      updateFields.push('image_url = ?');
      updateValues.push(image_url);
    }
    
    if (images !== undefined) {
      updateFields.push('images = ?');
      updateValues.push(JSON.stringify(images || []));
    }
    
    if (videos !== undefined) {
      updateFields.push('videos = ?');
      updateValues.push(JSON.stringify(videos || []));
    }
    
    if (details !== undefined) {
      updateFields.push('details = ?');
      updateValues.push(details);
    }
    
    if (shop_name !== undefined) {
      updateFields.push('shop_name = ?');
      updateValues.push(shop_name);
    }
    
    if (shop_avatar !== undefined) {
      updateFields.push('shop_avatar = ?');
      updateValues.push(shop_avatar);
    }
    
    if (payment_methods !== undefined) {
      updateFields.push('payment_methods = ?');
      updateValues.push(JSON.stringify(payment_methods || []));
    }
    
    if (status) {
      updateFields.push('status = ?');
      updateValues.push(status);
    }
    
    if (updateFields.length === 0) {
      return res.status(400).json({ message: '没有要更新的字段' });
    }
    
    updateFields.push('updated_at = NOW()');
    updateValues.push(productId);
    
    await getDB().execute(
      `UPDATE products SET ${updateFields.join(', ')} WHERE id = ?`,
      updateValues
    );
    

    
    // 更新商品属性
    if (attributes !== undefined) {
      // 删除原有属性
      await getDB().execute('DELETE FROM product_attributes WHERE product_id = ?', [productId]);
      
      // 添加新属性
      if (attributes && attributes.length > 0) {
        for (const attr of attributes) {
          await getDB().execute(
            `INSERT INTO product_attributes (product_id, attribute_key, attribute_value, sort_order) 
             VALUES (?, ?, ?, ?)`,
            [productId, attr.key, attr.value, attr.sort_order || 0]
          );
        }
      }
    }
    
    res.json({
      success: true,
      message: '商品更新成功'
    });
  } catch (error) {
    console.error('更新商品错误:', error);
    res.status(500).json({ message: '更新商品失败' });
  }
});

// 删除商品（管理员权限）
router.delete('/:id', auth, adminAuth, async (req, res) => {
  try {
    const { id } = req.params;
    
    // 检查商品是否存在
    const checkQuery = 'SELECT id FROM products WHERE id = ?';
    const [existing] = await getDB().execute(checkQuery, [id]);
    
    if (existing.length === 0) {
      return res.status(404).json({ success: false, message: '商品不存在' });
    }
    
    // 检查是否有相关订单
    const orderCheckQuery = 'SELECT id FROM orders WHERE product_id = ? LIMIT 1';
    const [orders] = await getDB().execute(orderCheckQuery, [id]);
    
    if (orders.length > 0) {
      return res.status(400).json({ success: false, message: '该商品存在相关订单，无法删除' });
    }
    
    const query = 'DELETE FROM products WHERE id = ?';
    await getDB().execute(query, [id]);
    
    res.json({
      success: true,
      message: '商品删除成功'
    });
  } catch (error) {
    console.error('删除商品失败:', error);
    res.status(500).json({ success: false, message: '删除商品失败' });
  }
});

// 获取商品统计信息（管理员权限）
router.get('/stats', auth, adminAuth, async (req, res) => {
  try {
    // 获取商品总数
    const totalQuery = 'SELECT COUNT(*) as total FROM products';
    const [totalResult] = await getDB().execute(totalQuery);
    const totalProducts = totalResult[0].total;
    
    // 获取活跃商品数
    const activeQuery = 'SELECT COUNT(*) as total FROM products WHERE status = "active"';
    const [activeResult] = await getDB().execute(activeQuery);
    const activeProducts = activeResult[0].total;
    
    // 获取库存不足商品数（库存小于10）
    const lowStockQuery = 'SELECT COUNT(*) as total FROM products WHERE stock < 10';
    const [lowStockResult] = await getDB().execute(lowStockQuery);
    const lowStockProducts = lowStockResult[0].total;
    
    // 获取本月新增商品数
    const monthlyQuery = `
      SELECT COUNT(*) as total 
      FROM products 
      WHERE YEAR(created_at) = YEAR(CURDATE()) AND MONTH(created_at) = MONTH(CURDATE())
    `;
    const [monthlyResult] = await getDB().execute(monthlyQuery);
    const monthlyProducts = monthlyResult[0].total;
    
    // 计算月增长率
    const lastMonthQuery = `
      SELECT COUNT(*) as total 
      FROM products 
      WHERE YEAR(created_at) = YEAR(DATE_SUB(CURDATE(), INTERVAL 1 MONTH)) 
      AND MONTH(created_at) = MONTH(DATE_SUB(CURDATE(), INTERVAL 1 MONTH))
    `;
    const [lastMonthResult] = await getDB().execute(lastMonthQuery);
    const lastMonthProducts = lastMonthResult[0].total;
    
    const monthlyGrowth = lastMonthProducts > 0 
      ? ((monthlyProducts - lastMonthProducts) / lastMonthProducts * 100).toFixed(1)
      : 0;
    
    res.json({
      success: true,
      data: {
        stats: {
          totalProducts,
          activeProducts,
          lowStockProducts,
          monthlyProducts,
          monthlyGrowth: parseFloat(monthlyGrowth)
        }
      }
    });
  } catch (error) {
    console.error('获取商品统计失败:', error);
    res.status(500).json({ success: false, message: '获取商品统计失败' });
  }
});

// 获取商品评论
router.get('/:id/reviews', async (req, res) => {
  try {
    const { id } = req.params;
    const page = parseInt(req.query.page) || 1;
    const limit = parseInt(req.query.limit) || 10;
    const offset = (page - 1) * limit;
    
    // 获取评论列表
    const [reviews] = await getDB().execute(
      `SELECT pr.id, pr.rating, pr.comment as content, pr.images, pr.created_at as createdAt,
              u.username as user_name, u.avatar as user_avatar
       FROM product_reviews pr
       JOIN users u ON pr.user_id = u.id
       WHERE pr.product_id = ?
       ORDER BY pr.created_at DESC
       LIMIT ${limit} OFFSET ${offset}`,
      [id]
    );
    
    // 获取评论总数
    const [countResult] = await getDB().execute(
      'SELECT COUNT(*) as total FROM product_reviews WHERE product_id = ?',
      [id]
    );
    
    // 计算平均评分
    const [avgResult] = await getDB().execute(
      'SELECT AVG(rating) as avg_rating FROM product_reviews WHERE product_id = ?',
      [id]
    );
    
    // 格式化评论数据
    const formattedReviews = reviews.map(review => ({
      id: review.id,
      user: {
        name: review.user_name,
        avatar: review.user_avatar
      },
      rating: review.rating,
      content: review.content,
      createdAt: review.createdAt,
      images: review.images ? JSON.parse(review.images) : null
    }));
    
    res.json({
      success: true,
      data: {
        reviews: formattedReviews,
        total: countResult[0].total,
        averageRating: avgResult[0].avg_rating ? parseFloat(avgResult[0].avg_rating).toFixed(1) : 0,
        pagination: {
          page,
          limit,
          total: countResult[0].total,
          totalPages: Math.ceil(countResult[0].total / limit)
        }
      }
    });
  } catch (error) {
    console.error('获取商品评论失败:', error);
    res.status(500).json({ success: false, message: '获取商品评论失败' });
  }
});

// 获取推荐商品
router.get('/:id/recommended', async (req, res) => {
  try {
    // 获取商品id
    const id = parseInt(req.params.id);

    // 通过商品id获取该商品的分类id
    const categoryQuery = `
      SELECT category_id FROM products_category WHERE product_id = ?
    `;
    const [currentCategory] = await getDB().execute(categoryQuery, [id]);
    
    let parentId = null;
    let categoryIds = currentCategory.map(item => item.category_id);
    
    if(currentCategory.length > 0 && currentCategory[0] !== null) {
      // 获取该商品的一级分类id
      const item = currentCategory[0];
      const levelQuery = `
        SELECT * FROM category WHERE id = ? AND level = 1
      `;
      const [fatherCategory] = await getDB().execute(levelQuery, [item.category_id]);
      
      if(fatherCategory.length > 0) {
        // 该商品为一级分类商品，不存在二级分类
        parentId = fatherCategory[0].id;
        categoryIds.push(parentId);
      } else {
        // 获取该商品的二级分类id
        const secondlevelQuery = `
          SELECT * FROM category WHERE id = ? AND level = 2
        `;
        const [secondlevelCategory] = await getDB().execute(secondlevelQuery, [item.category_id]);
        if(secondlevelCategory.length > 0) {
          // 通过二级分类获取一级分类id
          parentId = secondlevelCategory[0].parent_id;
          categoryIds.push(parentId);
        }
      }
    }

    // categoryIds目前存储该商品的一级分类id及其目录下所有二级分类的id
    const allSecondCategoryIdsQuery = `
      SELECT id FROM category WHERE parent_id = ? AND level = 2
    `;
    const [secondCategoryIds] = await getDB().execute(allSecondCategoryIdsQuery, [parentId]);
    categoryIds.push(...secondCategoryIds.map(item => item.id));

    let recommendedProducts = [];
    let filteredRecommendProductIds = [];

    // 如果有分类ID，先获取同类商品
    if (categoryIds.length > 0) {
      const recommendId = `
        SELECT * FROM products_category WHERE category_id IN (${categoryIds.map(() => '?').join(',')})
      `;
      const [recommendProductIds] = await getDB().execute(recommendId, categoryIds);

      filteredRecommendProductIds = [...new Set(recommendProductIds.map(item => item.product_id))];

      // 获取同类别的其他商品作为推荐
      if (filteredRecommendProductIds.length > 0) {
        const query = `
          SELECT id, name, price, points_price as points, 
                 stock, image_url as image, description
          FROM products 
          WHERE id IN (${filteredRecommendProductIds.map(() => '?').join(',')}) AND id != ?
        `;
        
        const [categoryProducts] = await getDB().execute(query, [...filteredRecommendProductIds, id]);
        recommendedProducts = categoryProducts;
      }
    }

    // 如果同类别商品不足，补充其他热门商品
    if (recommendedProducts.length < 6) {

      let recommendQuery = `
        SELECT products_id FROM recommend_product
        WHERE 1 = 1
      `;

      if (filteredRecommendProductIds.length > 0) {
        recommendQuery += ` AND products_id NOT IN (${filteredRecommendProductIds.map(() => '?').join(',')})`;
      }

      recommendQuery += ` ORDER BY RAND() LIMIT ${6 - recommendedProducts.length}`;

      // 根据是否有排除ID来传递参数
      const queryParams = filteredRecommendProductIds.length > 0 
        ? [...filteredRecommendProductIds] 
        : [];

      const [recommendProductIds] = await getDB().execute(recommendQuery, queryParams);
      filteredRecommendProductIds.push(...recommendProductIds.map(item => item.products_id));

      for (const item of recommendProductIds) {
        const recommendQuery = `
          SELECT id, name, price, points_price as points, 
                 stock, image_url as image, description
          FROM products 
          WHERE id = ?
        `;
        const [recommendProduct] = await getDB().execute(recommendQuery, [item.products_id]);
        recommendedProducts.push(recommendProduct[0]);
      }
      if (recommendProductIds.length < 6) {
        // 补充其他热门商品
        const additionalQuery = `
          SELECT id, name, price, points_price as points, 
                 stock, image_url as image, description
          FROM products
          WHERE id NOT IN (${filteredRecommendProductIds.map(() => '?').join(',')})
          ORDER BY RAND()
          LIMIT ${6 - recommendedProducts.length}
        `;
        const [additionalProducts] = await getDB().execute(
          additionalQuery,
          filteredRecommendProductIds
        );
        recommendedProducts.push(...additionalProducts);
      }
    }
    
    res.json({
      success: true,
      data: {
        products: recommendedProducts
      }
    });
  } catch (error) {
    console.error('获取推荐商品失败:', error);
    res.status(500).json({ success: false, message: '获取推荐商品失败' });
  }
});

// 收藏商品
router.post('/:id/favorite', auth, async (req, res) => {
  try {
    const productId = req.params.id;
    const userId = req.user.id;
    
    // 检查商品是否存在
    const [products] = await getDB().execute('SELECT id FROM products WHERE id = ?', [productId]);
    if (products.length === 0) {
      return res.status(404).json({ message: '商品不存在' });
    }
    
    // 检查是否已收藏
    const [existing] = await getDB().execute(
      'SELECT id FROM product_favorites WHERE user_id = ? AND product_id = ?',
      [userId, productId]
    );
    
    if (existing.length > 0) {
      return res.status(400).json({ message: '商品已收藏' });
    }
    
    await getDB().execute(
      'INSERT INTO product_favorites (user_id, product_id, created_at) VALUES (?, ?, NOW())',
      [userId, productId]
    );
    
    res.json({
      success: true,
      message: '收藏成功'
    });
  } catch (error) {
    console.error('收藏商品错误:', error);
    res.status(500).json({ message: '收藏失败' });
  }
});

// 取消收藏商品
router.delete('/:id/favorite', auth, async (req, res) => {
  try {
    const productId = req.params.id;
    const userId = req.user.id;
    
    const [result] = await getDB().execute(
      'DELETE FROM product_favorites WHERE user_id = ? AND product_id = ?',
      [userId, productId]
    );
    
    if (result.affectedRows === 0) {
      return res.status(404).json({ message: '未收藏该商品' });
    }
    
    res.json({
      success: true,
      message: '取消收藏成功'
    });
  } catch (error) {
    console.error('取消收藏错误:', error);
    res.status(500).json({ message: '取消收藏失败' });
  }
});

// 获取用户收藏的商品列表
router.get('/favorites', auth, async (req, res) => {
  try {
    const userId = req.user.id;
    const page = parseInt(req.query.page) || 1;
    const limit = parseInt(req.query.limit) || 10;
    const offset = (page - 1) * limit;
    
    const [favorites] = await getDB().execute(
      `SELECT p.*, pf.created_at as favorite_time 
       FROM product_favorites pf 
       JOIN products p ON pf.product_id = p.id 
       WHERE pf.user_id = ? AND p.status = 'active'
       ORDER BY pf.created_at DESC 
       LIMIT ${limit} OFFSET ${offset}`,
      [userId]
    );
    
    const [countResult] = await getDB().execute(
      `SELECT COUNT(*) as total 
       FROM product_favorites pf 
       JOIN products p ON pf.product_id = p.id 
       WHERE pf.user_id = ? AND p.status = 'active'`,
      [userId]
    );
    
    res.json({
      success: true,
      data: {
        products: favorites.map(product => ({
          ...product,
          images: product.images ? JSON.parse(product.images) : [],
          videos: product.videos ? JSON.parse(product.videos) : [],
          payment_methods: product.payment_methods ? JSON.parse(product.payment_methods) : []
        })),
        pagination: {
          page,
          limit,
          total: countResult[0].total,
          totalPages: Math.ceil(countResult[0].total / limit)
        }
      }
    });
  } catch (error) {
    console.error('获取收藏列表错误:', error);
    res.status(500).json({ message: '获取收藏列表失败' });
  }
});









// 获取商品属性
router.get('/:id/attributes', async (req, res) => {
  try {
    const productId = req.params.id;
    
    const [attributes] = await getDB().execute(
      'SELECT * FROM product_attributes WHERE product_id = ? ORDER BY sort_order, id',
      [productId]
    );
    
    res.json({
      success: true,
      data: attributes
    });
  } catch (error) {
    console.error('获取商品属性错误:', error);
    res.status(500).json({ message: '获取商品属性失败' });
  }
});

// 创建商品评论
router.post('/:id/reviews', auth, async (req, res) => {
  try {
    const productId = req.params.id;
    const userId = req.user.id;
    const { orderId, rating, comment, images = [] } = req.body;
    
    // 验证必填字段
    if (!orderId || !rating || rating < 1 || rating > 5) {
      return res.status(400).json({ message: '订单ID和评分(1-5)不能为空' });
    }
    
    // 检查订单是否存在且属于当前用户
    const [orders] = await getDB().execute(
      `SELECT o.id FROM orders o 
       JOIN order_items oi ON o.id = oi.order_id 
       WHERE o.id = ? AND o.user_id = ? AND oi.product_id = ? AND o.status = 'delivered'`,
      [orderId, userId, productId]
    );
    
    if (orders.length === 0) {
      return res.status(400).json({ message: '只能评价已完成的订单商品' });
    }
    
    // 检查是否已经评价过
    const [existingReviews] = await getDB().execute(
      'SELECT id FROM product_reviews WHERE product_id = ? AND user_id = ? AND order_id = ?',
      [productId, userId, orderId]
    );
    
    if (existingReviews.length > 0) {
      return res.status(400).json({ message: '该商品已评价过' });
    }
    
    // 创建评论
    const [result] = await getDB().execute(
      `INSERT INTO product_reviews (product_id, user_id, order_id, rating, comment, images, created_at) 
       VALUES (?, ?, ?, ?, ?, ?, NOW())`,
      [productId, userId, orderId, rating, comment, JSON.stringify(images)]
    );
    
    // 更新商品平均评分
    const [avgResult] = await getDB().execute(
      'SELECT AVG(rating) as avg_rating FROM product_reviews WHERE product_id = ?',
      [productId]
    );
    
    await getDB().execute(
      'UPDATE products SET rating = ? WHERE id = ?',
      [parseFloat(avgResult[0].avg_rating).toFixed(2), productId]
    );
    
    res.status(201).json({
      success: true,
      message: '评价成功',
      data: { reviewId: result.insertId }
    });
  } catch (error) {
    console.error('创建商品评论错误:', error);
    res.status(500).json({ message: '评价失败' });
  }
});

module.exports = router;