import {
  Controller,
  Post,
  Get,
  Body,
  UseGuards,
  Req,
  HttpCode,
  HttpStatus,
} from '@nestjs/common';
import {
  ApiTags,
  ApiOperation,
  ApiResponse,
  ApiBearerAuth,
  ApiBody,
} from '@nestjs/swagger';
import type { Request } from 'express';

import { AuthService } from './auth.service';
import { TwoFactorService } from './two-factor/two-factor.service';
import {
  RegisterDto,
  LoginDto,
  SocialAuthDto,
  ForgotPasswordDto,
  ResetPasswordDto,
  RefreshTokenDto,
  VerifyEmailDto,
} from './dto';
import {
  VerifyTwoFactorDto,
  VerifyTwoFactorLoginDto,
  VerifyBackupCodeDto,
  DisableTwoFactorDto,
  RegenerateBackupCodesDto,
} from './two-factor/dto';
import { JwtAuthGuard } from './guards';
import { Public, CurrentUser } from './decorators';

@ApiTags('Auth')
@Controller('auth')
export class AuthController {
  constructor(
    private readonly authService: AuthService,
    private readonly twoFactorService: TwoFactorService,
  ) {}

  // ==========================================
  // REGISTER
  // ==========================================
  @Public()
  @Post('register')
  @HttpCode(HttpStatus.CREATED)
  @ApiOperation({ summary: 'Register a new user' })
  @ApiBody({ type: RegisterDto })
  @ApiResponse({
    status: 201,
    description: 'User registered successfully',
    schema: {
      example: {
        success: true,
        data: {
          user: {
            id: 'uuid',
            email: 'john@example.com',
            role: 'USER',
            firstName: 'John',
            lastName: 'Doe',
          },
          accessToken: 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...',
          refreshToken: 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...',
        },
      },
    },
  })
  @ApiResponse({ status: 400, description: 'Validation error' })
  @ApiResponse({ status: 409, description: 'Email already registered' })
  async register(@Body() dto: RegisterDto) {
    return this.authService.register(dto);
  }

  // ==========================================
  // LOGIN
  // ==========================================
  @Public()
  @Post('login')
  @HttpCode(HttpStatus.OK)
  @ApiOperation({ summary: 'Login with email and password' })
  @ApiBody({ type: LoginDto })
  @ApiResponse({
    status: 200,
    description: 'Login successful',
    schema: {
      example: {
        success: true,
        data: {
          user: {
            id: 'uuid',
            email: 'john@example.com',
            role: 'USER',
            firstName: 'John',
            lastName: 'Doe',
            avatar: null,
          },
          accessToken: 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...',
          refreshToken: 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...',
        },
      },
    },
  })
  @ApiResponse({ status: 401, description: 'Invalid credentials' })
  async login(@Body() dto: LoginDto, @Req() req: Request) {
    const userAgent = req.headers['user-agent'];
    const ipAddress =
      req.ip || req.headers['x-forwarded-for']?.toString() || 'unknown';

    return this.authService.login(dto, userAgent, ipAddress);
  }

  // ==========================================
  // SOCIAL AUTH
  // ==========================================
  @Public()
  @Post('social')
  @HttpCode(HttpStatus.OK)
  @ApiOperation({ summary: 'Login or register with social provider' })
  @ApiBody({ type: SocialAuthDto })
  @ApiResponse({
    status: 200,
    description: 'Social auth successful',
    schema: {
      example: {
        success: true,
        data: {
          user: {
            id: 'uuid',
            email: 'john@example.com',
            role: 'USER',
            firstName: 'John',
            lastName: 'Doe',
            avatar: 'https://example.com/avatar.jpg',
          },
          accessToken: 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...',
          refreshToken: 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...',
        },
      },
    },
  })
  @ApiResponse({ status: 400, description: 'Invalid provider data' })
  async socialAuth(@Body() dto: SocialAuthDto) {
    return this.authService.socialAuth(dto);
  }

  // ==========================================
  // FORGOT PASSWORD
  // ==========================================
  @Public()
  @Post('forgot-password')
  @HttpCode(HttpStatus.OK)
  @ApiOperation({ summary: 'Request password reset email' })
  @ApiBody({ type: ForgotPasswordDto })
  @ApiResponse({
    status: 200,
    description: 'Password reset email sent (if email exists)',
    schema: {
      example: {
        success: true,
        data: {
          message: 'If the email exists, a password reset link will be sent',
        },
      },
    },
  })
  async forgotPassword(@Body() dto: ForgotPasswordDto) {
    return this.authService.forgotPassword(dto);
  }

  // ==========================================
  // RESET PASSWORD
  // ==========================================
  @Public()
  @Post('reset-password')
  @HttpCode(HttpStatus.OK)
  @ApiOperation({ summary: 'Reset password with token' })
  @ApiBody({ type: ResetPasswordDto })
  @ApiResponse({
    status: 200,
    description: 'Password reset successful',
    schema: {
      example: {
        success: true,
        data: {
          message: 'Password reset successful. Please login with your new password.',
        },
      },
    },
  })
  @ApiResponse({ status: 400, description: 'Invalid or expired token' })
  async resetPassword(@Body() dto: ResetPasswordDto) {
    return this.authService.resetPassword(dto);
  }

  // ==========================================
  // VERIFY EMAIL
  // ==========================================
  @Public()
  @Post('verify-email')
  @HttpCode(HttpStatus.OK)
  @ApiOperation({ summary: 'Verify email with token' })
  @ApiBody({ type: VerifyEmailDto })
  @ApiResponse({
    status: 200,
    description: 'Email verified successfully',
    schema: {
      example: {
        success: true,
        data: {
          message: 'Email verified successfully',
        },
      },
    },
  })
  @ApiResponse({ status: 400, description: 'Invalid or expired token' })
  async verifyEmail(@Body() dto: VerifyEmailDto) {
    return this.authService.verifyEmail(dto);
  }

  // ==========================================
  // RESEND VERIFICATION EMAIL
  // ==========================================
  @Post('resend-verification')
  @UseGuards(JwtAuthGuard)
  @HttpCode(HttpStatus.OK)
  @ApiBearerAuth('JWT-auth')
  @ApiOperation({ summary: 'Resend email verification' })
  @ApiResponse({
    status: 200,
    description: 'Verification email sent',
    schema: {
      example: {
        success: true,
        data: {
          message: 'Verification email sent',
        },
      },
    },
  })
  @ApiResponse({ status: 401, description: 'Unauthorized' })
  async resendVerification(@CurrentUser('id') userId: string) {
    return this.authService.resendVerificationEmail(userId);
  }

  // ==========================================
  // REFRESH TOKEN
  // ==========================================
  @Public()
  @Post('refresh')
  @HttpCode(HttpStatus.OK)
  @ApiOperation({ summary: 'Refresh access token' })
  @ApiBody({ type: RefreshTokenDto })
  @ApiResponse({
    status: 200,
    description: 'Tokens refreshed successfully',
    schema: {
      example: {
        success: true,
        data: {
          accessToken: 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...',
          refreshToken: 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...',
        },
      },
    },
  })
  @ApiResponse({ status: 401, description: 'Invalid refresh token' })
  async refreshToken(@Body() dto: RefreshTokenDto) {
    return this.authService.refreshToken(dto);
  }

  // ==========================================
  // GET CURRENT USER
  // ==========================================
  @Get('me')
  @UseGuards(JwtAuthGuard)
  @ApiBearerAuth('JWT-auth')
  @ApiOperation({ summary: 'Get current user profile' })
  @ApiResponse({
    status: 200,
    description: 'Current user profile',
    schema: {
      example: {
        success: true,
        data: {
          id: 'uuid',
          email: 'john@example.com',
          role: 'USER',
          status: 'ACTIVE',
          emailVerified: true,
          authProvider: 'LOCAL',
          firstName: 'John',
          lastName: 'Doe',
          avatar: null,
          phone: null,
          city: null,
          state: null,
          country: null,
          createdAt: '2024-01-01T00:00:00.000Z',
          lastLoginAt: '2024-01-01T00:00:00.000Z',
        },
      },
    },
  })
  @ApiResponse({ status: 401, description: 'Unauthorized' })
  async getCurrentUser(@CurrentUser('id') userId: string) {
    return this.authService.getCurrentUser(userId);
  }

  // ==========================================
  // LOGOUT
  // ==========================================
  @Post('logout')
  @UseGuards(JwtAuthGuard)
  @HttpCode(HttpStatus.OK)
  @ApiBearerAuth('JWT-auth')
  @ApiOperation({ summary: 'Logout current session' })
  @ApiResponse({
    status: 200,
    description: 'Logged out successfully',
    schema: {
      example: {
        success: true,
        data: {
          message: 'Logged out successfully',
        },
      },
    },
  })
  @ApiResponse({ status: 401, description: 'Unauthorized' })
  async logout(@CurrentUser('id') userId: string, @Req() req: Request) {
    const authHeader = req.headers.authorization;
    const accessToken = authHeader?.replace('Bearer ', '');

    return this.authService.logout(userId, accessToken);
  }

  // ==========================================
  // LOGOUT ALL SESSIONS
  // ==========================================
  @Post('logout-all')
  @UseGuards(JwtAuthGuard)
  @HttpCode(HttpStatus.OK)
  @ApiBearerAuth('JWT-auth')
  @ApiOperation({ summary: 'Logout all sessions' })
  @ApiResponse({
    status: 200,
    description: 'All sessions logged out',
    schema: {
      example: {
        success: true,
        data: {
          message: 'Logged out successfully',
        },
      },
    },
  })
  @ApiResponse({ status: 401, description: 'Unauthorized' })
  async logoutAll(@CurrentUser('id') userId: string) {
    return this.authService.logout(userId);
  }

  // ==========================================
  // TWO-FACTOR AUTHENTICATION ENDPOINTS
  // ==========================================

  // Setup 2FA - Generate secret and QR code
  @Post('2fa/setup')
  @UseGuards(JwtAuthGuard)
  @HttpCode(HttpStatus.OK)
  @ApiBearerAuth('JWT-auth')
  @ApiOperation({ summary: 'Setup two-factor authentication' })
  @ApiResponse({
    status: 200,
    description: 'Returns secret and QR code for 2FA setup',
    schema: {
      example: {
        secret: 'JBSWY3DPEHPK3PXP',
        qrCode: 'data:image/png;base64,...',
        manualEntry: 'JBSWY3DPEHPK3PXP',
      },
    },
  })
  async setupTwoFactor(@CurrentUser('id') userId: string) {
    return this.twoFactorService.setupTwoFactor(userId);
  }

  // Enable 2FA - Verify token and enable
  @Post('2fa/enable')
  @UseGuards(JwtAuthGuard)
  @HttpCode(HttpStatus.OK)
  @ApiBearerAuth('JWT-auth')
  @ApiOperation({ summary: 'Enable two-factor authentication' })
  @ApiBody({ type: VerifyTwoFactorDto })
  @ApiResponse({
    status: 200,
    description: '2FA enabled successfully with backup codes',
    schema: {
      example: {
        backupCodes: ['ABC12345', 'DEF67890', '...'],
      },
    },
  })
  async enableTwoFactor(
    @CurrentUser('id') userId: string,
    @Body() dto: VerifyTwoFactorDto,
  ) {
    return this.twoFactorService.enableTwoFactor(userId, dto.token);
  }

  // Disable 2FA
  @Post('2fa/disable')
  @UseGuards(JwtAuthGuard)
  @HttpCode(HttpStatus.OK)
  @ApiBearerAuth('JWT-auth')
  @ApiOperation({ summary: 'Disable two-factor authentication' })
  @ApiBody({ type: DisableTwoFactorDto })
  @ApiResponse({
    status: 200,
    description: '2FA disabled successfully',
  })
  async disableTwoFactor(
    @CurrentUser('id') userId: string,
    @Body() dto: DisableTwoFactorDto,
  ) {
    await this.twoFactorService.disableTwoFactor(userId, dto.password);
    return { message: 'Two-factor authentication disabled successfully' };
  }

  // Verify 2FA token during login
  @Public()
  @Post('2fa/verify')
  @HttpCode(HttpStatus.OK)
  @ApiOperation({ summary: 'Verify 2FA token during login' })
  @ApiBody({ type: VerifyTwoFactorLoginDto })
  @ApiResponse({
    status: 200,
    description: 'Login successful with 2FA verification',
    schema: {
      example: {
        user: {
          id: 'uuid',
          email: 'john@example.com',
          role: 'USER',
        },
        accessToken: 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...',
        refreshToken: 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...',
      },
    },
  })
  async verifyTwoFactorLogin(@Body() dto: VerifyTwoFactorLoginDto) {
    return this.authService.verifyTwoFactorLogin(
      dto.tempToken,
      dto.token,
      dto.userAgent,
      dto.ipAddress,
    );
  }

  // Verify backup code during login
  @Public()
  @Post('2fa/verify-backup')
  @HttpCode(HttpStatus.OK)
  @ApiOperation({ summary: 'Verify backup code during login' })
  @ApiBody({ type: VerifyBackupCodeDto })
  @ApiResponse({
    status: 200,
    description: 'Login successful with backup code verification',
  })
  async verifyBackupCode(@Body() dto: VerifyBackupCodeDto) {
    return this.authService.verifyBackupCodeLogin(
      dto.tempToken,
      dto.backupCode,
      dto.userAgent,
      dto.ipAddress,
    );
  }

  // Get 2FA status
  @Get('2fa/status')
  @UseGuards(JwtAuthGuard)
  @ApiBearerAuth('JWT-auth')
  @ApiOperation({ summary: 'Get 2FA status' })
  @ApiResponse({
    status: 200,
    description: '2FA status',
    schema: {
      example: {
        enabled: true,
        verifiedAt: '2024-01-01T00:00:00.000Z',
      },
    },
  })
  async getTwoFactorStatus(@CurrentUser('id') userId: string) {
    return this.twoFactorService.getStatus(userId);
  }

  // Regenerate backup codes
  @Post('2fa/backup-codes')
  @UseGuards(JwtAuthGuard)
  @HttpCode(HttpStatus.OK)
  @ApiBearerAuth('JWT-auth')
  @ApiOperation({ summary: 'Regenerate backup codes' })
  @ApiBody({ type: RegenerateBackupCodesDto })
  @ApiResponse({
    status: 200,
    description: 'New backup codes generated',
    schema: {
      example: {
        backupCodes: ['ABC12345', 'DEF67890', '...'],
      },
    },
  })
  async regenerateBackupCodes(
    @CurrentUser('id') userId: string,
    @Body() dto: RegenerateBackupCodesDto,
  ) {
    return this.twoFactorService.regenerateBackupCodes(userId, dto.password);
  }
}