/**
 * 生成产品管理和订单管理测试数据
 * @file generate-test-data.js
 * @description 为产品和订单模块生成测试数据并插入数据库
 */

const { sequelize } = require('./config/database-simple');
const { Product, Order, OrderItem, User } = require('./models');

// 产品测试数据
const productData = [
  {
    name: '有机苹果',
    description: '新鲜有机苹果，来自山东烟台，口感甜脆，营养丰富',
    price: 1200, // 12.00元，以分为单位
    stock: 500,
    image_url: '/images/products/apple.jpg',
    is_active: true
  },
  {
    name: '优质大米',
    description: '东北优质大米，粒粒饱满，口感香甜，5kg装',
    price: 3500, // 35.00元
    stock: 200,
    image_url: '/images/products/rice.jpg',
    is_active: true
  },
  {
    name: '新鲜鸡蛋',
    description: '农场散养鸡蛋，30枚装，营养价值高',
    price: 2800, // 28.00元
    stock: 150,
    image_url: '/images/products/eggs.jpg',
    is_active: true
  },
  {
    name: '有机蔬菜礼盒',
    description: '精选有机蔬菜组合，包含白菜、萝卜、青菜等',
    price: 4500, // 45.00元
    stock: 80,
    image_url: '/images/products/vegetable-box.jpg',
    is_active: true
  },
  {
    name: '纯天然蜂蜜',
    description: '纯天然野花蜜，500g装，无添加剂',
    price: 6800, // 68.00元
    stock: 120,
    image_url: '/images/products/honey.jpg',
    is_active: true
  },
  {
    name: '有机牛奶',
    description: '有机牧场牛奶，1L装，营养丰富',
    price: 1800, // 18.00元
    stock: 300,
    image_url: '/images/products/milk.jpg',
    is_active: true
  },
  {
    name: '农家土鸡',
    description: '农家散养土鸡，约2kg，肉质鲜美',
    price: 8500, // 85.00元
    stock: 50,
    image_url: '/images/products/chicken.jpg',
    is_active: true
  },
  {
    name: '新鲜玉米',
    description: '甜玉米，10根装，口感甜嫩',
    price: 1500, // 15.00元
    stock: 200,
    image_url: '/images/products/corn.jpg',
    is_active: true
  },
  {
    name: '有机胡萝卜',
    description: '有机胡萝卜，2kg装，营养丰富',
    price: 1200, // 12.00元
    stock: 180,
    image_url: '/images/products/carrot.jpg',
    is_active: true
  },
  {
    name: '精品茶叶',
    description: '高山绿茶，250g装，香气清雅',
    price: 12800, // 128.00元
    stock: 60,
    image_url: '/images/products/tea.jpg',
    is_active: true
  }
];

// 生成随机订单数据的辅助函数
function generateRandomOrders(users, products, orderCount = 20) {
  const orders = [];
  const orderStatuses = ['pending', 'processing', 'shipped', 'delivered', 'cancelled'];
  const paymentStatuses = ['unpaid', 'paid', 'refunded'];
  const addresses = [
    '北京市朝阳区建国路88号',
    '上海市浦东新区陆家嘴环路1000号',
    '广州市天河区珠江新城花城大道123号',
    '深圳市南山区科技园南区456号',
    '杭州市西湖区文三路789号',
    '成都市锦江区春熙路321号',
    '武汉市江汉区中山大道654号',
    '西安市雁塔区高新路987号'
  ];

  for (let i = 0; i < orderCount; i++) {
    const user = users[Math.floor(Math.random() * users.length)];
    const status = orderStatuses[Math.floor(Math.random() * orderStatuses.length)];
    const paymentStatus = paymentStatuses[Math.floor(Math.random() * paymentStatuses.length)];
    const address = addresses[Math.floor(Math.random() * addresses.length)];
    
    // 创建订单基本信息
    const order = {
      user_id: user.id,
      total_amount: 0, // 稍后计算
      status: status,
      payment_status: paymentStatus,
      shipping_address: address,
      created_at: new Date(Date.now() - Math.random() * 30 * 24 * 60 * 60 * 1000) // 最近30天内的随机时间
    };

    // 为每个订单生成1-5个订单项
    const itemCount = Math.floor(Math.random() * 5) + 1;
    const orderItems = [];
    let totalAmount = 0;

    for (let j = 0; j < itemCount; j++) {
      const product = products[Math.floor(Math.random() * products.length)];
      const quantity = Math.floor(Math.random() * 3) + 1; // 1-3个
      const price = product.price;
      
      orderItems.push({
        product_id: product.id,
        quantity: quantity,
        price: price
      });
      
      totalAmount += price * quantity;
    }

    order.total_amount = totalAmount;
    order.items = orderItems;
    orders.push(order);
  }

  return orders;
}

// 主函数：生成并插入测试数据
async function generateTestData() {
  try {
    console.log('开始生成测试数据...');
    
    // 连接数据库
    await sequelize.authenticate();
    console.log('数据库连接成功');

    // 获取现有用户
    const users = await User.findAll();
    if (users.length === 0) {
      console.log('警告：数据库中没有用户数据，请先创建用户');
      return;
    }
    console.log(`找到 ${users.length} 个用户`);

    // 清理现有的测试数据（可选）
    console.log('清理现有测试数据...');
    await OrderItem.destroy({ where: {} });
    await Order.destroy({ where: {} });
    await Product.destroy({ where: {} });
    console.log('清理完成');

    // 插入产品数据
    console.log('插入产品数据...');
    const createdProducts = await Product.bulkCreate(productData);
    console.log(`成功插入 ${createdProducts.length} 个产品`);

    // 生成订单数据
    console.log('生成订单数据...');
    const orderData = generateRandomOrders(users, createdProducts, 25);
    
    // 使用事务插入订单和订单项
    console.log('插入订单和订单项数据...');
    let orderCount = 0;
    let orderItemCount = 0;

    for (const orderInfo of orderData) {
      await sequelize.transaction(async (t) => {
        // 创建订单
        const order = await Order.create({
          user_id: orderInfo.user_id,
          total_amount: orderInfo.total_amount,
          status: orderInfo.status,
          payment_status: orderInfo.payment_status,
          shipping_address: orderInfo.shipping_address,
          created_at: orderInfo.created_at
        }, { transaction: t });

        // 创建订单项
        const orderItems = orderInfo.items.map(item => ({
          order_id: order.id,
          product_id: item.product_id,
          quantity: item.quantity,
          price: item.price
        }));

        await OrderItem.bulkCreate(orderItems, { transaction: t });
        
        orderCount++;
        orderItemCount += orderItems.length;
      });
    }

    console.log(`成功插入 ${orderCount} 个订单`);
    console.log(`成功插入 ${orderItemCount} 个订单项`);

    // 显示统计信息
    console.log('\n=== 数据统计 ===');
    const productCount = await Product.count();
    const totalOrderCount = await Order.count();
    const totalOrderItemCount = await OrderItem.count();
    
    console.log(`产品总数: ${productCount}`);
    console.log(`订单总数: ${totalOrderCount}`);
    console.log(`订单项总数: ${totalOrderItemCount}`);

    // 显示一些示例数据
    console.log('\n=== 示例产品 ===');
    const sampleProducts = await Product.findAll({ limit: 3 });
    sampleProducts.forEach(product => {
      console.log(`${product.name} - ¥${(product.price / 100).toFixed(2)} - 库存: ${product.stock}`);
    });

    console.log('\n=== 示例订单 ===');
    const sampleOrders = await Order.findAll({ 
      limit: 3,
      include: [
        { model: User, as: 'user', attributes: ['username'] },
        { 
          model: OrderItem, 
          as: 'orderItems',
          include: [{ model: Product, as: 'product', attributes: ['name'] }]
        }
      ]
    });
    
    sampleOrders.forEach(order => {
      console.log(`订单 #${order.id} - 用户: ${order.user.username} - 总额: ¥${(order.total_amount / 100).toFixed(2)} - 状态: ${order.status}`);
      order.orderItems.forEach(item => {
        console.log(`  - ${item.product.name} x ${item.quantity}`);
      });
    });

    console.log('\n测试数据生成完成！');
    
  } catch (error) {
    console.error('生成测试数据失败:', error);
  } finally {
    await sequelize.close();
  }
}

// 运行脚本
if (require.main === module) {
  generateTestData();
}

module.exports = { generateTestData, productData };