const express = require('express')
const bodyParser = require('body-parser')
const app = express()

app.use(bodyParser.json())

// 模拟数据库
let users = []

app.post('/api/register', (req, res) => {
  const { username, password } = req.body
  if (users.some(u => u.username === username)) {
    return res.status(400).json({ message: '用户已存在' })
  }
  
  const newUser = {
    id: Date.now(),
    username,
    password, // 实际项目需要加密存储
    createdAt: new Date().toISOString()
  }
  
  users.push(newUser)
  res.json({ 
    token: 'mock-jwt-token',
    user: newUser
  })
})

app.post('/api/login', (req, res) => {
  const { username, password } = req.body
  const user = users.find(u => u.username === username)
  
  if (!user || user.password !== password) {
    return res.status(401).json({ message: '用户名或密码错误' })
  }
  
  res.json({
    token: 'mock-jwt-token',
    user
  })
})

app.get('/api/user', (req, res) => {
  // 实际需要验证token
  res.json(users[0] || {})
})

app.listen(3000, () => {
  console.log('Mock API服务器运行在 http://localhost:8080')
})