const express = require('express')
const db = require('./db/mysql')

const app = express()

// 解析 JSON 请求体
app.use(express.json())

app.get('/api/test-db', (req, res) => {
  db.query('SELECT 1 + 1 AS result', (error, results) => {
    if (error) {
      console.error('数据库查询失败：', error)

      return res.status(500).json({
        code: 500,
        message: '数据库查询失败'
      })
    }

    res.json({
      code: 200,
      message: '数据库连接成功',
      data: results
    })
  })
})

app.post('/api/login', (req, res) => {
    const { username, password } = req.body

    const sql = `
    SELECT * FROM chat_mysql.users
    WHERE username = ? AND password = ?;
  `
    db.query(sql, [username, password], (error, results) => {
      if (error) {
        console.error('数据库查询失败：', error)

        return res.status(500).json({
            code: 500,
            message: '登录失败'
        })
      }

      if (results.length > 0) {
        res.json({
          code: 200,
          message: '登录成功',
          data: {
            token: 'this_is_a_mock_token',
            username: results[0].username
          }
        })
      } else {
        res.json({
          code: 401,
          message: '用户名或密码错误',
          data: null
        })
      }
    })
})

app.post('/api/register', (req, res) => {
  const { username, password } = req.body

  const sql = `
    INSERT INTO users (username, password)
    VALUES (?, ?)
  `

  db.query(sql, [username, password], (error, result) => {
    if (error) {
      console.error(error)

      return res.status(500).json({
        code: 500,
        message: '注册失败'
      })
    }

    res.json({
      code: 200,
      message: '注册成功',
      data: {
        id: result.insertId
      }
    })
  })
})

app.listen(3000, () => {
  console.log('服务器启动成功：http://localhost:3000')
})