import { NextApiRequest, NextApiResponse } from 'next';
import jwt from 'jsonwebtoken';

interface LoginRequest {
  email: string;
  password: string;
}

// 硬编码的管理员凭据（用于演示）
const ADMIN_CREDENTIALS = {
  email: 'admin@example.com',
  password: 'admin123',
  user: {
    id: 'admin-001',
    email: 'admin@example.com',
    name: '系统管理员',
    userType: 'admin',
    phone: '13800138000',
    avatarUrl: null
  }
};

export default async function handler(
  req: NextApiRequest,
  res: NextApiResponse
) {
  if (req.method !== 'POST') {
    return res.status(405).json({ success: false, error: '方法不允许' });
  }

  try {
    const { email, password }: LoginRequest = req.body;

    console.log('收到登录请求:', { email, password: '***' });

    // 验证必填字段
    if (!email || !password) {
      console.log('缺少必填字段');
      return res.status(400).json({ 
        success: false, 
        error: '邮箱和密码不能为空' 
      });
    }

    // 验证邮箱格式
    const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
    if (!emailRegex.test(email)) {
      console.log('邮箱格式不正确:', email);
      return res.status(400).json({ 
        success: false, 
        error: '邮箱格式不正确' 
      });
    }

    console.log('验证管理员凭据...');

    // 验证管理员凭据
    if (email !== ADMIN_CREDENTIALS.email || password !== ADMIN_CREDENTIALS.password) {
      console.log('管理员凭据不正确');
      return res.status(401).json({ 
        success: false, 
        error: '邮箱或密码错误' 
      });
    }

    console.log('管理员凭据验证通过');

    // 生成JWT令牌
    const jwtSecret = process.env.JWT_SECRET || 'your-secret-key';
    const token = jwt.sign(
      { 
        userId: ADMIN_CREDENTIALS.user.id, 
        email: ADMIN_CREDENTIALS.user.email, 
        userType: ADMIN_CREDENTIALS.user.userType,
        name: ADMIN_CREDENTIALS.user.name 
      },
      jwtSecret,
      { expiresIn: '24h' }
    );

    console.log('JWT令牌生成成功');
    console.log('登录成功，返回用户信息');

    // 返回成功响应
    res.status(200).json({
      success: true,
      message: '登录成功',
      user: ADMIN_CREDENTIALS.user,
      token,
      expiresIn: '24h'
    });

  } catch (error) {
    console.error('登录错误:', error);
    res.status(500).json({ 
      success: false, 
      error: process.env.NODE_ENV === 'development' 
        ? `服务器错误: ${error}` 
        : '服务器内部错误' 
    });
  }
}