const express = require('express');
const router = express.Router();
const Joi = require('joi');
const User = require('../models/User');
const { generateToken, refreshToken, authenticateToken } = require('../middleware/auth');

// 验证schema
const loginSchema = Joi.object({
  username: Joi.string().min(2).max(50).required(),
  password: Joi.string().min(6).max(100).required()
});

const passwordResetRequestSchema = Joi.object({
  phone: Joi.string().pattern(/^1[3-9]\d{9}$/).required()
});

const passwordResetConfirmSchema = Joi.object({
  phone: Joi.string().pattern(/^1[3-9]\d{9}$/).required(),
  resetCode: Joi.string().required(),
  newPassword: Joi.string().min(6).max(100).required()
});

const changePasswordSchema = Joi.object({
  oldPassword: Joi.string().required(),
  newPassword: Joi.string().min(6).max(100).required()
});

// 用户登录
router.post('/login', async (req, res) => {
  try {
    const { error, value } = loginSchema.validate(req.body);
    if (error) {
      return res.status(400).json({
        success: false,
        message: '参数验证失败',
        errors: error.details.map(detail => detail.message)
      });
    }

    const { username, password } = value;
    
    // 查找用户
    const user = await User.findByLoginIdentifier(username);

    if (!user) {
      return res.status(401).json({
        success: false,
        message: '用户名或密码错误',
        code: 'INVALID_CREDENTIALS'
      });
    }

    // 验证密码
    const isValidPassword = await user.validatePassword(password);
    if (!isValidPassword) {
      return res.status(401).json({
        success: false,
        message: '用户名或密码错误',
        code: 'INVALID_CREDENTIALS'
      });
    }

    if (user.status !== 'active') {
      return res.status(401).json({
        success: false,
        message: '账号已被禁用，请联系管理员',
        code: 'ACCOUNT_DISABLED'
      });
    }

    // 更新登录信息
    await user.updateLoginInfo();

    // 生成JWT token
    const tokens = generateToken(user);
    
    res.json({
      success: true,
      message: '登录成功',
      data: {
        ...tokens,
        user: {
          id: user.id,
          uuid: user.uuid,
          username: user.username,
          phone: user.phone,
          email: user.email,
          real_name: user.real_name,
          avatar_url: user.avatar_url,
          user_type: user.user_type,
          status: user.status,
          last_login_at: user.last_login_at,
          login_count: user.login_count
        }
      }
    });
  } catch (error) {
    console.error('登录错误:', error);
    res.status(500).json({
      success: false,
      message: '登录失败',
      error: error.message
    });
  }
});

// 获取用户信息
router.get('/me', authenticateToken, async (req, res) => {
  try {
    // req.user 已经通过中间件注入
    res.json({
      success: true,
      data: {
        id: req.user.id,
        uuid: req.user.uuid,
        username: req.user.username,
        phone: req.user.phone,
        email: req.user.email,
        real_name: req.user.real_name,
        avatar_url: req.user.avatar_url,
        user_type: req.user.user_type,
        status: req.user.status,
        last_login_at: req.user.last_login_at,
        login_count: req.user.login_count,
        created_at: req.user.created_at,
        updated_at: req.user.updated_at
      }
    });
  } catch (error) {
    console.error('获取用户信息错误:', error);
    res.status(500).json({
      success: false,
      message: '获取用户信息失败',
      error: error.message
    });
  }
});

// 用户登出
router.post('/logout', authenticateToken, async (req, res) => {
  try {
    // TODO: 实际项目中可以将token加入黑名单或Redis
    res.json({
      success: true,
      message: '退出登录成功'
    });
  } catch (error) {
    console.error('退出登录错误:', error);
    res.status(500).json({
      success: false,
      message: '退出登录失败',
      error: error.message
    });
  }
});

// 刷新token
router.post('/refresh', refreshToken);

// 验证token有效性
router.post('/verify', authenticateToken, (req, res) => {
  try {
    // 如果通过认证中间件，说明token有效
    res.json({
      success: true,
      message: 'Token有效',
      data: {
        valid: true,
        user: {
          id: req.user.id,
          username: req.user.username,
          user_type: req.user.user_type
        }
      }
    });
  } catch (error) {
    console.error('Token验证错误:', error);
    res.status(500).json({
      success: false,
      message: 'Token验证失败',
      error: error.message
    });
  }
});

module.exports = router;