import { NextRequest, NextResponse } from 'next/server';
import crypto from 'crypto';
import pool from '@/lib/db';

function hashPassword(password: string): string {
  return crypto.createHash('sha256').update(password).digest('hex');
}

function generateToken(): string {
  return crypto.randomBytes(32).toString('hex');
}

export async function POST(request: NextRequest) {
  let connection;
  try {
    const { username, password } = await request.json();
    
    if (!username || !password) {
      return NextResponse.json({ error: '用户名和密码不能为空' }, { status: 400 });
    }
    
    connection = await pool.getConnection();
    
    const [rows] = await connection.query<any[]>('SELECT * FROM users WHERE username = ?', [username]);
    
    if (rows.length === 0 || rows[0].password_hash !== hashPassword(password)) {
      return NextResponse.json({ error: '用户名或密码错误' }, { status: 401 });
    }
    
    const newToken = generateToken();
    await connection.query('UPDATE users SET token = ? WHERE id = ?', [newToken, rows[0].id]);
    
    const response = NextResponse.json({ success: true, username });
    response.cookies.set('auth_token', newToken, {
      httpOnly: true,
      secure: false,
      sameSite: 'lax',
      maxAge: 60 * 60 * 24 * 7,
      path: '/'
    });
    
    return response;
  } catch (error) {
    console.error('Login error:', error);
    return NextResponse.json({ error: '登录失败' }, { status: 500 });
  } finally {
    if (connection) connection.release();
  }
}