/**
 * 登录控制器
 * 
 * 功能描述：
 * - 处理登录相关的HTTP请求和响应
 * - 提供RESTful API接口
 * - 数据验证和格式化
 * 
 * API端点：
 * - POST /auth/login - 用户登录
 * - POST /auth/register - 用户注册
 * - POST /auth/github - GitHub OAuth登录
 * - POST /auth/forgot-password - 发送密码重置验证码
 * - POST /auth/reset-password - 重置密码
 * - PUT /auth/change-password - 修改密码
 * 
 * @author moyin
 * @version 1.0.0
 * @since 2025-12-17
 */

import { Controller, Post, Put, Body, HttpCode, HttpStatus, ValidationPipe, UsePipes, Logger } from '@nestjs/common';
import { LoginService, ApiResponse, LoginResponse } from './login.service';
import { LoginDto, RegisterDto, GitHubOAuthDto, ForgotPasswordDto, ResetPasswordDto, ChangePasswordDto } from './login.dto';

@Controller('auth')
export class LoginController {
  private readonly logger = new Logger(LoginController.name);

  constructor(private readonly loginService: LoginService) {}

  /**
   * 用户登录
   * 
   * @param loginDto 登录数据
   * @returns 登录结果
   */
  @Post('login')
  @HttpCode(HttpStatus.OK)
  @UsePipes(new ValidationPipe({ transform: true }))
  async login(@Body() loginDto: LoginDto): Promise<ApiResponse<LoginResponse>> {
    return await this.loginService.login({
      identifier: loginDto.identifier,
      password: loginDto.password
    });
  }

  /**
   * 用户注册
   * 
   * @param registerDto 注册数据
   * @returns 注册结果
   */
  @Post('register')
  @HttpCode(HttpStatus.CREATED)
  @UsePipes(new ValidationPipe({ transform: true }))
  async register(@Body() registerDto: RegisterDto): Promise<ApiResponse<LoginResponse>> {
    return await this.loginService.register({
      username: registerDto.username,
      password: registerDto.password,
      nickname: registerDto.nickname,
      email: registerDto.email,
      phone: registerDto.phone
    });
  }

  /**
   * GitHub OAuth登录
   * 
   * @param githubDto GitHub OAuth数据
   * @returns 登录结果
   */
  @Post('github')
  @HttpCode(HttpStatus.OK)
  @UsePipes(new ValidationPipe({ transform: true }))
  async githubOAuth(@Body() githubDto: GitHubOAuthDto): Promise<ApiResponse<LoginResponse>> {
    return await this.loginService.githubOAuth({
      github_id: githubDto.github_id,
      username: githubDto.username,
      nickname: githubDto.nickname,
      email: githubDto.email,
      avatar_url: githubDto.avatar_url
    });
  }

  /**
   * 发送密码重置验证码
   * 
   * @param forgotPasswordDto 忘记密码数据
   * @returns 发送结果
   */
  @Post('forgot-password')
  @HttpCode(HttpStatus.OK)
  @UsePipes(new ValidationPipe({ transform: true }))
  async forgotPassword(@Body() forgotPasswordDto: ForgotPasswordDto): Promise<ApiResponse<{ verification_code?: string }>> {
    return await this.loginService.sendPasswordResetCode(forgotPasswordDto.identifier);
  }

  /**
   * 重置密码
   * 
   * @param resetPasswordDto 重置密码数据
   * @returns 重置结果
   */
  @Post('reset-password')
  @HttpCode(HttpStatus.OK)
  @UsePipes(new ValidationPipe({ transform: true }))
  async resetPassword(@Body() resetPasswordDto: ResetPasswordDto): Promise<ApiResponse> {
    return await this.loginService.resetPassword({
      identifier: resetPasswordDto.identifier,
      verificationCode: resetPasswordDto.verification_code,
      newPassword: resetPasswordDto.new_password
    });
  }

  /**
   * 修改密码
   * 
   * @param changePasswordDto 修改密码数据
   * @returns 修改结果
   */
  @Put('change-password')
  @HttpCode(HttpStatus.OK)
  @UsePipes(new ValidationPipe({ transform: true }))
  async changePassword(@Body() changePasswordDto: ChangePasswordDto): Promise<ApiResponse> {
    // 实际应用中应从JWT令牌中获取用户ID
    // 这里为了演示，使用请求体中的用户ID
    const userId = BigInt(changePasswordDto.user_id);
    
    return await this.loginService.changePassword(
      userId,
      changePasswordDto.old_password,
      changePasswordDto.new_password
    );
  }
}