// 加载环境变量配置
require('dotenv').config();

const express = require('express');
const cors = require('cors');
const bodyParser = require('body-parser');
const path = require('path');
const rateLimit = require('express-rate-limit');
const helmet = require('helmet');
const { initDB, getDB, dbConfig } = require('./database');
const { logger } = require('./config/logger');
const { errorHandler, notFound } = require('./middleware/errorHandler');
const fs = require('fs');


const app = express();
const PORT = process.env.PORT || 3000;

// 确保日志目录存在
const logDir = path.join(__dirname, 'logs');
if (!fs.existsSync(logDir)) {
  fs.mkdirSync(logDir, { recursive: true });
}

// 安全中间件
app.use(helmet({
  contentSecurityPolicy: false, // 为了支持前端应用
  crossOriginEmbedderPolicy: false,
  crossOriginOpenerPolicy: false, // 禁用 COOP 头部以避免非 HTTPS 环境的警告
  originAgentCluster: false // 禁用Origin-Agent-Cluster头部
}));

// 中间件配置
// CORS配置 - 允许前端访问静态资源
app.use(cors({
  origin: [
    'http://localhost:5173', 
    'http://localhost:5176', 
    'http://localhost:5175', 
    'http://localhost:5174', 
    'http://localhost:3001',
    'https://www.zrbjr.com',
    'https://zrbjr.com'
  ],
  credentials: true,
  methods: ['GET', 'POST', 'PUT', 'DELETE', 'OPTIONS'],
  allowedHeaders: ['Content-Type', 'Authorization', 'X-Requested-With']
}));
app.use(bodyParser.json({ limit: '10mb' }));
app.use(bodyParser.urlencoded({ extended: true, limit: '10mb' }));



// 请求日志中间件
app.use((req, res, next) => {
  const start = Date.now();
  
  res.on('finish', () => {
    const duration = Date.now() - start;
    
    // 只记录非正常状态码的请求日志（过滤掉200、304等正常返回）
    if (res.statusCode >= 400 || res.statusCode < 200) {
      logger.info('HTTP Request', {
        method: req.method,
        url: req.originalUrl,
        statusCode: res.statusCode,
        duration: `${duration}ms`,
        ip: req.ip,
        userAgent: req.get('User-Agent')
      });
    }
  });
  
  next();
});

// 限流中间件
const limiter = rateLimit({
  windowMs: 15 * 60 * 1000, // 15分钟
  max: 1000, // 限制每个IP 15分钟内最多100个请求
  message: {
    success: false,
    error: {
      code: 'RATE_LIMIT_EXCEEDED',
      message: '请求过于频繁，请稍后再试'
    }
  }
});
app.use('/', limiter);

// 引入数据库初始化模块
const { initDatabase } = require('./config/database-init');


// 商城后台相关接口
app.use('/shopbackend', require('./routes/shopbackend'));
//订单管理接口
app.use('/orders', require('./routes/orders'))
//商品列表
app.use('/products', require('./routes/products'))
//供应商接口
app.use('/supplier',require('./routes/supplier'))
//规格处理
app.use('/specifications', require('./routes/specifications'));
// 优惠券商品接口
app.use('/couponproducts', require('./routes/couponproducts'));

// 提现管理接口
app.use('/withdrawals', require('./routes/withdrawals'));

// 商品分类接口
app.use('/category', require('./routes/category'));

// 认证接口
app.use('/auth', require('./routes/auth'));

// 用户接口
app.use('/users', require('./routes/users'));



// 404处理
app.use(notFound);

// 全局错误处理中间件
app.use(errorHandler);

// 导出数据库连接供路由使用
module.exports = { 
  get db() { return getDB(); }
};

// 启动服务器
app.listen(PORT, async () => {
  try {
    logger.info('Server starting', { port: PORT });
    console.log(`服务器运行在 http://localhost:${PORT}`);
    
    await initDatabase();
    global.captchaStore = new Map();
    logger.info('Server started successfully', {
      port: PORT,
      environment: process.env.NODE_ENV || 'development'
    });
  } catch (error) {
    logger.error('Failed to start server', { error: error.message });
    process.exit(1);
  }
});

// 优雅关闭
process.on('SIGTERM', async () => {
  logger.info('SIGTERM received, shutting down gracefully');
  try {
    const { closeDB } = require('./database');
    await closeDB();
  } catch (error) {
    logger.error('Error closing database', { error: error.message });
  }
  process.exit(0);
});

process.on('SIGINT', async () => {
  logger.info('SIGINT received, shutting down gracefully');
  try {
    const { closeDB } = require('./database');
    await closeDB();
  } catch (error) {
    logger.error('Error closing database', { error: error.message });
  }
  process.exit(0);
});

process.on('unhandledRejection', (reason, promise) => {
  logger.error('Unhandled Rejection', { reason, promise });
});

process.on('uncaughtException', (error) => {
  logger.error('Uncaught Exception', { error: error.message, stack: error.stack });
  process.exit(1);
});