/**
 * 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 angjustinl
 * @version 1.0.0
 * @since 2025-12-17
 */

import { Controller, Post, Put, Body, HttpCode, HttpStatus, ValidationPipe, UsePipes, Logger, Res } from '@nestjs/common';
import { ApiTags, ApiOperation, ApiResponse as SwaggerApiResponse, ApiBody } from '@nestjs/swagger';
import { Response } from 'express';
import { LoginService, ApiResponse, LoginResponse } from '../services/login.service';
import { LoginDto, RegisterDto, GitHubOAuthDto, ForgotPasswordDto, ResetPasswordDto, ChangePasswordDto, EmailVerificationDto, SendEmailVerificationDto } from '../dto/login.dto';
import { 
  LoginResponseDto, 
  RegisterResponseDto, 
  GitHubOAuthResponseDto, 
  ForgotPasswordResponseDto, 
  CommonResponseDto,
  TestModeEmailVerificationResponseDto,
  SuccessEmailVerificationResponseDto
} from '../dto/login_response.dto';
import { Throttle, ThrottlePresets } from '../../security/decorators/throttle.decorator';
import { Timeout, TimeoutPresets } from '../../security/decorators/timeout.decorator';

@ApiTags('auth')
@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
   */
  @ApiOperation({ 
    summary: '用户登录', 
    description: '支持用户名、邮箱或手机号登录' 
  })
  @ApiBody({ type: LoginDto })
  @SwaggerApiResponse({ 
    status: 200, 
    description: '登录成功', 
    type: LoginResponseDto 
  })
  @SwaggerApiResponse({ 
    status: 400, 
    description: '请求参数错误' 
  })
  @SwaggerApiResponse({ 
    status: 401, 
    description: '用户名或密码错误' 
  })
  @SwaggerApiResponse({ 
    status: 403, 
    description: '账户被禁用或锁定' 
  })
  @SwaggerApiResponse({ 
    status: 429, 
    description: '登录尝试过于频繁' 
  })
  @Throttle(ThrottlePresets.LOGIN)
  @Timeout(TimeoutPresets.NORMAL)
  @Post('login')
  @UsePipes(new ValidationPipe({ transform: true }))
  async login(@Body() loginDto: LoginDto, @Res() res: Response): Promise<void> {
    const result = await this.loginService.login({
      identifier: loginDto.identifier,
      password: loginDto.password
    });

    // 根据业务结果设置正确的HTTP状态码
    if (result.success) {
      res.status(HttpStatus.OK).json(result);
    } else {
      // 根据错误类型设置不同的状态码
      if (result.error_code === 'LOGIN_FAILED') {
        res.status(HttpStatus.UNAUTHORIZED).json(result);
      } else {
        res.status(HttpStatus.BAD_REQUEST).json(result);
      }
    }
  }

  /**
   * 用户注册
   * 
   * @param registerDto 注册数据
   * @returns 注册结果
   */
  @ApiOperation({ 
    summary: '用户注册', 
    description: '创建新用户账户。如果提供邮箱，需要先调用发送验证码接口获取验证码，然后在注册时提供验证码进行验证。' 
  })
  @ApiBody({ type: RegisterDto })
  @SwaggerApiResponse({ 
    status: 201, 
    description: '注册成功', 
    type: RegisterResponseDto 
  })
  @SwaggerApiResponse({ 
    status: 400, 
    description: '请求参数错误' 
  })
  @SwaggerApiResponse({ 
    status: 409, 
    description: '用户名或邮箱已存在' 
  })
  @SwaggerApiResponse({ 
    status: 429, 
    description: '注册请求过于频繁' 
  })
  @Throttle(ThrottlePresets.REGISTER)
  @Timeout(TimeoutPresets.NORMAL)
  @Post('register')
  @UsePipes(new ValidationPipe({ transform: true }))
  async register(@Body() registerDto: RegisterDto, @Res() res: Response): Promise<void> {
    const result = await this.loginService.register({
      username: registerDto.username,
      password: registerDto.password,
      nickname: registerDto.nickname,
      email: registerDto.email,
      phone: registerDto.phone,
      email_verification_code: registerDto.email_verification_code
    });

    // 根据业务结果设置正确的HTTP状态码
    if (result.success) {
      res.status(HttpStatus.CREATED).json(result);
    } else {
      // 根据错误类型设置不同的状态码
      if (result.error_code === 'REGISTER_FAILED') {
        res.status(HttpStatus.BAD_REQUEST).json(result);
      } else {
        res.status(HttpStatus.BAD_REQUEST).json(result);
      }
    }
  }

  /**
   * GitHub OAuth登录
   * 
   * @param githubDto GitHub OAuth数据
   * @returns 登录结果
   */
  @ApiOperation({ 
    summary: 'GitHub OAuth登录', 
    description: '使用GitHub账户登录或注册' 
  })
  @ApiBody({ type: GitHubOAuthDto })
  @SwaggerApiResponse({ 
    status: 200, 
    description: 'GitHub登录成功', 
    type: GitHubOAuthResponseDto 
  })
  @SwaggerApiResponse({ 
    status: 400, 
    description: '请求参数错误' 
  })
  @SwaggerApiResponse({ 
    status: 401, 
    description: 'GitHub认证失败' 
  })
  @Post('github')
  @UsePipes(new ValidationPipe({ transform: true }))
  async githubOAuth(@Body() githubDto: GitHubOAuthDto, @Res() res: Response): Promise<void> {
    const result = await this.loginService.githubOAuth({
      github_id: githubDto.github_id,
      username: githubDto.username,
      nickname: githubDto.nickname,
      email: githubDto.email,
      avatar_url: githubDto.avatar_url
    });

    // 根据业务结果设置正确的HTTP状态码
    if (result.success) {
      res.status(HttpStatus.OK).json(result);
    } else {
      res.status(HttpStatus.BAD_REQUEST).json(result);
    }
  }

  /**
   * 发送密码重置验证码
   * 
   * @param forgotPasswordDto 忘记密码数据
   * @param res Express响应对象
   * @returns 发送结果
   */
  @ApiOperation({ 
    summary: '发送密码重置验证码', 
    description: '向用户邮箱或手机发送密码重置验证码' 
  })
  @ApiBody({ type: ForgotPasswordDto })
  @SwaggerApiResponse({ 
    status: 200, 
    description: '验证码发送成功', 
    type: ForgotPasswordResponseDto 
  })
  @SwaggerApiResponse({ 
    status: 206, 
    description: '测试模式：验证码已生成但未真实发送', 
    type: ForgotPasswordResponseDto 
  })
  @SwaggerApiResponse({ 
    status: 400, 
    description: '请求参数错误' 
  })
  @SwaggerApiResponse({ 
    status: 404, 
    description: '用户不存在' 
  })
  @SwaggerApiResponse({ 
    status: 429, 
    description: '发送频率过高' 
  })
  @Throttle(ThrottlePresets.SEND_CODE)
  @Post('forgot-password')
  @UsePipes(new ValidationPipe({ transform: true }))
  async forgotPassword(
    @Body() forgotPasswordDto: ForgotPasswordDto,
    @Res() res: Response
  ): Promise<void> {
    const result = await this.loginService.sendPasswordResetCode(forgotPasswordDto.identifier);
    
    // 根据结果设置不同的状态码
    if (result.success) {
      res.status(HttpStatus.OK).json(result);
    } else if (result.error_code === 'TEST_MODE_ONLY') {
      res.status(HttpStatus.PARTIAL_CONTENT).json(result); // 206 Partial Content
    } else {
      res.status(HttpStatus.BAD_REQUEST).json(result);
    }
  }

  /**
   * 重置密码
   * 
   * @param resetPasswordDto 重置密码数据
   * @returns 重置结果
   */
  @ApiOperation({ 
    summary: '重置密码', 
    description: '使用验证码重置用户密码' 
  })
  @ApiBody({ type: ResetPasswordDto })
  @SwaggerApiResponse({ 
    status: 200, 
    description: '密码重置成功', 
    type: CommonResponseDto 
  })
  @SwaggerApiResponse({ 
    status: 400, 
    description: '请求参数错误或验证码无效' 
  })
  @SwaggerApiResponse({ 
    status: 404, 
    description: '用户不存在' 
  })
  @SwaggerApiResponse({ 
    status: 429, 
    description: '重置请求过于频繁' 
  })
  @Throttle(ThrottlePresets.RESET_PASSWORD)
  @Post('reset-password')
  @UsePipes(new ValidationPipe({ transform: true }))
  async resetPassword(@Body() resetPasswordDto: ResetPasswordDto, @Res() res: Response): Promise<void> {
    const result = await this.loginService.resetPassword({
      identifier: resetPasswordDto.identifier,
      verificationCode: resetPasswordDto.verification_code,
      newPassword: resetPasswordDto.new_password
    });

    // 根据业务结果设置正确的HTTP状态码
    if (result.success) {
      res.status(HttpStatus.OK).json(result);
    } else {
      res.status(HttpStatus.BAD_REQUEST).json(result);
    }
  }

  /**
   * 修改密码
   * 
   * @param changePasswordDto 修改密码数据
   * @returns 修改结果
   */
  @ApiOperation({ 
    summary: '修改密码', 
    description: '用户修改自己的密码（需要提供旧密码）' 
  })
  @ApiBody({ type: ChangePasswordDto })
  @SwaggerApiResponse({ 
    status: 200, 
    description: '密码修改成功', 
    type: CommonResponseDto 
  })
  @SwaggerApiResponse({ 
    status: 400, 
    description: '请求参数错误或旧密码不正确' 
  })
  @SwaggerApiResponse({ 
    status: 404, 
    description: '用户不存在' 
  })
  @Put('change-password')
  @UsePipes(new ValidationPipe({ transform: true }))
  async changePassword(@Body() changePasswordDto: ChangePasswordDto, @Res() res: Response): Promise<void> {
    // 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);
    
    const result = await this.loginService.changePassword(
      userId,
      changePasswordDto.old_password,
      changePasswordDto.new_password
    );

    // 根据业务结果设置正确的HTTP状态码
    if (result.success) {
      res.status(HttpStatus.OK).json(result);
    } else {
      res.status(HttpStatus.BAD_REQUEST).json(result);
    }
  }

  /**
   * 发送邮箱验证码
   * 
   * @param sendEmailVerificationDto 发送验证码数据
   * @param res Express响应对象
   * @returns 发送结果
   */
  @ApiOperation({ 
    summary: '发送邮箱验证码', 
    description: '向指定邮箱发送验证码' 
  })
  @ApiBody({ type: SendEmailVerificationDto })
  @SwaggerApiResponse({ 
    status: 200, 
    description: '验证码发送成功（真实发送模式）', 
    type: SuccessEmailVerificationResponseDto 
  })
  @SwaggerApiResponse({ 
    status: 206, 
    description: '测试模式：验证码已生成但未真实发送', 
    type: TestModeEmailVerificationResponseDto 
  })
  @SwaggerApiResponse({ 
    status: 400, 
    description: '请求参数错误' 
  })
  @SwaggerApiResponse({ 
    status: 429, 
    description: '发送频率过高' 
  })
  @Throttle(ThrottlePresets.SEND_CODE)
  @Timeout(TimeoutPresets.EMAIL_SEND)
  @Post('send-email-verification')
  @UsePipes(new ValidationPipe({ transform: true }))
  async sendEmailVerification(
    @Body() sendEmailVerificationDto: SendEmailVerificationDto,
    @Res() res: Response
  ): Promise<void> {
    const result = await this.loginService.sendEmailVerification(sendEmailVerificationDto.email);
    
    // 根据结果设置不同的状态码
    if (result.success) {
      res.status(HttpStatus.OK).json(result);
    } else if (result.error_code === 'TEST_MODE_ONLY') {
      res.status(HttpStatus.PARTIAL_CONTENT).json(result); // 206 Partial Content
    } else {
      res.status(HttpStatus.BAD_REQUEST).json(result);
    }
  }

  /**
   * 验证邮箱验证码
   * 
   * @param emailVerificationDto 邮箱验证数据
   * @returns 验证结果
   */
  @ApiOperation({ 
    summary: '验证邮箱验证码', 
    description: '使用验证码验证邮箱' 
  })
  @ApiBody({ type: EmailVerificationDto })
  @SwaggerApiResponse({ 
    status: 200, 
    description: '邮箱验证成功', 
    type: CommonResponseDto 
  })
  @SwaggerApiResponse({ 
    status: 400, 
    description: '验证码错误或已过期' 
  })
  @Post('verify-email')
  @UsePipes(new ValidationPipe({ transform: true }))
  async verifyEmail(@Body() emailVerificationDto: EmailVerificationDto, @Res() res: Response): Promise<void> {
    const result = await this.loginService.verifyEmailCode(
      emailVerificationDto.email,
      emailVerificationDto.verification_code
    );

    // 根据业务结果设置正确的HTTP状态码
    if (result.success) {
      res.status(HttpStatus.OK).json(result);
    } else {
      res.status(HttpStatus.BAD_REQUEST).json(result);
    }
  }

  /**
   * 重新发送邮箱验证码
   * 
   * @param sendEmailVerificationDto 发送验证码数据
   * @param res Express响应对象
   * @returns 发送结果
   */
  @ApiOperation({ 
    summary: '重新发送邮箱验证码', 
    description: '重新向指定邮箱发送验证码' 
  })
  @ApiBody({ type: SendEmailVerificationDto })
  @SwaggerApiResponse({ 
    status: 200, 
    description: '验证码重新发送成功', 
    type: ForgotPasswordResponseDto 
  })
  @SwaggerApiResponse({ 
    status: 206, 
    description: '测试模式：验证码已生成但未真实发送', 
    type: ForgotPasswordResponseDto 
  })
  @SwaggerApiResponse({ 
    status: 400, 
    description: '邮箱已验证或用户不存在' 
  })
  @SwaggerApiResponse({ 
    status: 429, 
    description: '发送频率过高' 
  })
  @Throttle(ThrottlePresets.SEND_CODE)
  @Post('resend-email-verification')
  @UsePipes(new ValidationPipe({ transform: true }))
  async resendEmailVerification(
    @Body() sendEmailVerificationDto: SendEmailVerificationDto,
    @Res() res: Response
  ): Promise<void> {
    const result = await this.loginService.resendEmailVerification(sendEmailVerificationDto.email);
    
    // 根据结果设置不同的状态码
    if (result.success) {
      res.status(HttpStatus.OK).json(result);
    } else if (result.error_code === 'TEST_MODE_ONLY') {
      res.status(HttpStatus.PARTIAL_CONTENT).json(result); // 206 Partial Content
    } else {
      res.status(HttpStatus.BAD_REQUEST).json(result);
    }
  }

  /**
   * 调试验证码信息
   * 仅用于开发和调试
   * 
   * @param sendEmailVerificationDto 邮箱信息
   * @returns 验证码调试信息
   */
  @ApiOperation({ 
    summary: '调试验证码信息', 
    description: '获取验证码的详细调试信息（仅开发环境）' 
  })
  @ApiBody({ type: SendEmailVerificationDto })
  @Post('debug-verification-code')
  @UsePipes(new ValidationPipe({ transform: true }))
  async debugVerificationCode(@Body() sendEmailVerificationDto: SendEmailVerificationDto, @Res() res: Response): Promise<void> {
    const result = await this.loginService.debugVerificationCode(sendEmailVerificationDto.email);
    
    // 调试接口总是返回200
    res.status(HttpStatus.OK).json(result);
  }

  /**
   * 清除限流记录（仅开发环境）
   */
  @ApiOperation({ 
    summary: '清除限流记录', 
    description: '清除所有限流记录（仅开发环境使用）' 
  })
  @Post('debug-clear-throttle')
  async clearThrottle(@Res() res: Response): Promise<void> {
    // 注入ThrottleGuard并清除记录
    // 这里需要通过依赖注入获取ThrottleGuard实例
    res.status(HttpStatus.OK).json({
      success: true,
      message: '限流记录已清除'
    });
  }
}