const express = require('express');
const db = require('../db-sqlite');
const { authenticate } = require('../middleware/auth');

module.exports = function(app) {
  const router = express.Router();

  router.get('/', authenticate, async (req, res) => {
    try {
      const productsResult = await db.query('SELECT id, name, category_id, unit, price, stock, min_stock, created_at, updated_at FROM products');
      const products = productsResult.rows;
      res.json({ success: true, data: products, count: products.length });
    } 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' });
    }
  });

  router.get('/template', authenticate, async (req, res) => {
    try {
      const templateResult = await db.query('SELECT id, name, category_id, unit, price, stock, min_stock, created_at, updated_at FROM products WHERE id = 1');
      const template = templateResult.rows[0];
      res.json({ success: true, data: template });
    } catch (error) {
      console.error('获取商品模板失败:', error);
      res.status(500).json({ success: false, message: '获取商品模板失败' });
    }
  });

  router.get('/:id', authenticate, async (req, res) => {
    try {
      const { id } = req.params;
      const productResult = await db.query('SELECT id, name, category_id, unit, price, stock, min_stock, created_at, updated_at FROM products WHERE id = ?', [id]);
      
      if (productResult.rows.length === 0) {
        return res.status(404).json({ success: false, message: '商品不存在' });
      }
      
      const product = productResult.rows[0];
      res.json({ success: true, data: product });
    } 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' });
    }
  });

  router.post('/', authenticate, async (req, res) => {
    try {
      const { name, category_id, unit, price, stock, min_stock } = req.body;
      
      if (!name) {
        return res.status(400).json({ success: false, message: '商品名称为必填项' });
      }
      
      const result = await db.query(
        'INSERT INTO products (name, category_id, unit, price, stock, min_stock, 
         created_at, updated_at) VALUES (?, ?, ?, ?, ?, ?, CURRENT_TIMESTAMP, CURRENT_TIMESTAMP)',
        [name, category_id, unit, price, stock, min_stock]
      );
      
      const newProductResult = await db.query('SELECT id, name, category_id, unit, price, stock, min_stock, created_at, updated_at FROM products WHERE id = ?', [result.lastID]);
      const newProduct = newProductResult.rows[0];
      
      console.log(`商品 ${name} 创建成功后端，由 ${req.user.username} 操作`);
      res.json({ success: true, data: newProduct });
    } catch (error) {
      console.error('创建商品失败:', error);
      res.status(500).json({ success: false, message: '创建商品失败' });
    }
  });

  router.put('/:id', authenticate, async (req, res) => {
    try {
      const { id } = req.params;
      const { name, category_id, unit, price, stock, min_stock } = req.body;
      
      await db.query(
        'UPDATE products SET name = ?, category_id = ?, unit = ?, price = ?, stock = ?, min_stock = ?, updated_at = CURRENT_TIMESTAMP WHERE id = ?',
        [name, category_id, unit, price, stock, min_stock, id]
      );
      
      const updatedProductResult = await db.query('SELECT id, name, category_id, unit, price, stock, min_stock, created_at, updated_at FROM products WHERE id = ?', [id]);
      const updatedProduct = updatedProductResult.rows[0];
      
      res.json({ success: true, data: updatedProduct });
    } catch (error) {
      console.error('更新商品信息失败:', error);
      res.status(500).json({ success: false, message: '更新商品信息失败' });
    }
  });

  router.delete('/:id', authenticate, async (req, res) => {
    try {
      const { id } = req.params;
      
      const existingProduct = await db.query('SELECT id FROM products WHERE id = ?', [id]);
      if (existingProduct.rows.length === 0) {
        return res.status(404).json({ success: false, message: '商品不存在' });
      }
      
      await db.query('DELETE FROM products WHERE id = ?', [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' });
    }
  });

  app.use('/api/products', router);
};