// 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.AGENT_PORT || 3002;

// 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 - 允许代理前端访问
app.use(cors({
    origin: [
        'http://192.168.1.43:5175',
        'http://localhost:5173',
        'http://localhost:5176',
        'http://localhost:5175',
        'http://localhost:5174',
        'http://localhost:3002',
        'https://agent.zrbjr.com',
        '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1000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('/api', limiter);
// 上传文件静态服务
app.use('/uploads', express.static(path.join(__dirname, 'uploads'), {
    setHeaders: (res, filePath) => {
        res.setHeader('Access-Control-Allow-Origin', '*');
        res.setHeader('Access-Control-Allow-Methods', 'GET, OPTIONS');
        res.setHeader('Access-Control-Allow-Headers', 'Content-Type, Authorization');
    }
}));
// API路由 - 代理专用路由
app.use('/api/auth', require('./routes/auth'));
// 添加代理认证路由别名，兼容前端请求
app.use('/api/agents/auth', require('./routes/auth'));
app.use('/api/agent', require('./routes/agent'));
app.use('/api/users', require('./routes/users'));
app.use('/api/transfers', require('./routes/transfers'));
app.use('/api/commissions', require('./routes/commissions'));
app.use('/api/upload', require('./routes/upload'));
app.use('/api/captcha', require('./routes/captcha')); // 验证码路由


// 404处理
app.use(notFound);

// 错误处理
app.use(errorHandler);

// 导出app供测试使用
module.exports = {
    app, getDB
};

// 初始化全局验证码存储
global.captchaStore = new Map();

// 启动服务器
app.listen(PORT, async () => {
    try {
        // 初始化数据库连接
        await initDB();
        console.log(`代理后台API服务器运行在端口 ${PORT}`);
    } catch (error) {
        console.error('服务器启动失败:', error);
        process.exit(1);
    }
});

// 优雅关闭处理
process.on('SIGTERM', async () => {
    console.log('收到SIGTERM信号，正在关闭服务器...');
    try {
        await closeDB();
        console.log('数据库连接已关闭');
    } catch (error) {
        console.error('关闭数据库连接时出错:', error);
    }
    process.exit(0);
});

process.on('SIGINT', async () => {
    console.log('收到SIGINT信号，正在关闭服务器...');
    try {
        await closeDB();
        console.log('数据库连接已关闭');
    } catch (error) {
        console.error('关闭数据库连接时出错:', error);
    }
    process.exit(0);
});

process.on('unhandledRejection', (reason, promise) => {
    console.error('未处理的Promise拒绝:', reason);
});

process.on('uncaughtException', (error) => {
    console.error('未捕获的异常:', error);
    process.exit(1);
});