const express = require('express');
const path = require('path')
const cors = require('cors');
const bodyParser = require('body-parser');
const session = require('express-session');

const host = '0.0.0.0'; // 服务器的 IP 地址
const port = 3000;
const app = express();
app.use(cors());

// 模拟用户数据库
const users = {
    "user1": "user1",
    "user2": "user2",
}

app.use(bodyParser.json());
app.use(session({
    secret: 'yourSecretKey',
    resave: false,
    saveUninitialized: true,
    cookie: {
        maxAge: 30 * 60 * 1000, // 30 分钟
    }
}));

function isAuthenticated(req, res, next) {
    if (req.path.endsWith('.css') || req.path.endsWith('.js')) {
        return next();
    }
    if (req.path === '/login.html' || req.path === '/login') {
        return next();
    }
    if (req.session.username) {
        return next(); // 已登录
    } else {
        res.redirect('/login.html'); // 未登录
    }
}

app.use(isAuthenticated);

app.use(express.static(path.join(__dirname, './html/')));
app.get('*', (req, res) => {
    res.sendFile(path.join(__dirname, './html/gm3.html'));
});


// 登录接口
app.post('/login', (req, res) => {
    const {username, password } = req.body;
    console.log(req.body)
    if (users[username] && users[username]==password) {
        req.session.username = username;
        res.status(200).json({ message: 'Login successful' });
    } else {
        res.status(401).json({ message: 'Invalid username' });
    }
});

// 检查登录状态接口
app.get('/check-auth', (req, res) => {
    if (req.session.username) {
        res.status(200).json({ loggedIn: true });
    } else {
        res.status(401).json({ loggedIn: false });
    }
});

app.listen(port, host, () => {
  console.log(`Server is running at http://${host}:${port}`);
});