require('dotenv').config();
const express = require('express');
const mongoose = require('mongoose');
const cors = require('cors');
const morgan = require('morgan');

// 导入路由
const authRoutes = require('./routes/auth');
const examRoutes = require('./routes/exams');
const resultRoutes = require('./routes/results');

// 初始化应用
const app = express();

// 中间件
app.use(cors());
app.use(morgan('dev'));
app.use(express.json());

// 数据库连接
mongoose.connect(process.env.MONGODB_URI)
    .then(() => console.log('Connected to MongoDB'))
    .catch(err => console.error('MongoDB connection error:', err));

// 路由
app.use('/api/auth', authRoutes);
app.use('/api/exams', examRoutes);
app.use('/api/results', resultRoutes);

// 错误处理中间件
app.use((err, req, res, next) => {
    console.error(err.stack);
    res.status(500).json({ message: 'Something went wrong!' });
});

// 启动服务器
const PORT = process.env.PORT || 5000;
app.listen(PORT, () => {
    console.log(`Server running on port ${PORT}`);
});
// 在app.js中添加更详细的CORS配置
app.use(cors({
    origin: 'http://localhost', // 或你的前端实际域名
    methods: ['GET', 'POST', 'PUT', 'DELETE'],
    allowedHeaders: ['Content-Type', 'Authorization']
}));