import {
  Controller,
  Get,
  Put,
  Param,
  Body,
  UseGuards,
  Request,
  HttpStatus,
  BadRequestException,
  ForbiddenException,
  NotFoundException,
} from '@nestjs/common';
import { ApiTags, ApiOperation, ApiResponse, ApiBearerAuth } from '@nestjs/swagger';
import { JwtAuthGuard } from '../auth/auth.guard';
import { ImagesService } from './images.service';
import { UpdateFilenameDto, UpdateFilenameResponseDto } from './dto/update-filename.dto';
import { ImageResponseDto, BatchImagesResponseDto } from './dto/image-response.dto';

@ApiTags('images')
@Controller('api/image')
@UseGuards(JwtAuthGuard)
@ApiBearerAuth()
export class ImagesController {
  constructor(private readonly imagesService: ImagesService) {}

  @Put(':imageId/filename')
  @ApiOperation({
    summary: 'Update image filename',
    description: 'Updates the proposed filename for a specific image',
  })
  @ApiResponse({
    status: HttpStatus.OK,
    description: 'Filename updated successfully',
    type: UpdateFilenameResponseDto,
  })
  @ApiResponse({
    status: HttpStatus.BAD_REQUEST,
    description: 'Invalid filename or request data',
  })
  @ApiResponse({
    status: HttpStatus.NOT_FOUND,
    description: 'Image not found',
  })
  @ApiResponse({
    status: HttpStatus.FORBIDDEN,
    description: 'Not authorized to update this image',
  })
  async updateImageFilename(
    @Param('imageId') imageId: string,
    @Body() updateFilenameDto: UpdateFilenameDto,
    @Request() req: any,
  ): Promise<UpdateFilenameResponseDto> {
    try {
      const userId = req.user?.id;
      if (!userId) {
        throw new BadRequestException('User not authenticated');
      }

      const result = await this.imagesService.updateFilename(
        imageId,
        userId,
        updateFilenameDto.new_name
      );

      return result;
    } catch (error) {
      if (
        error instanceof BadRequestException ||
        error instanceof ForbiddenException ||
        error instanceof NotFoundException
      ) {
        throw error;
      }
      throw new BadRequestException('Failed to update image filename');
    }
  }

  @Get(':imageId')
  @ApiOperation({
    summary: 'Get image details',
    description: 'Returns detailed information about a specific image',
  })
  @ApiResponse({
    status: HttpStatus.OK,
    description: 'Image details retrieved successfully',
    type: ImageResponseDto,
  })
  @ApiResponse({
    status: HttpStatus.NOT_FOUND,
    description: 'Image not found',
  })
  @ApiResponse({
    status: HttpStatus.FORBIDDEN,
    description: 'Not authorized to access this image',
  })
  async getImage(
    @Param('imageId') imageId: string,
    @Request() req: any,
  ): Promise<ImageResponseDto> {
    try {
      const userId = req.user?.id;
      if (!userId) {
        throw new BadRequestException('User not authenticated');
      }

      const image = await this.imagesService.getImage(imageId, userId);
      return image;
    } catch (error) {
      if (
        error instanceof BadRequestException ||
        error instanceof ForbiddenException ||
        error instanceof NotFoundException
      ) {
        throw error;
      }
      throw new BadRequestException('Failed to get image details');
    }
  }

  @Get('batch/:batchId')
  @ApiOperation({
    summary: 'Get all images in a batch',
    description: 'Returns all images belonging to a specific batch',
  })
  @ApiResponse({
    status: HttpStatus.OK,
    description: 'Batch images retrieved successfully',
    type: BatchImagesResponseDto,
  })
  @ApiResponse({
    status: HttpStatus.NOT_FOUND,
    description: 'Batch not found',
  })
  @ApiResponse({
    status: HttpStatus.FORBIDDEN,
    description: 'Not authorized to access this batch',
  })
  async getBatchImages(
    @Param('batchId') batchId: string,
    @Request() req: any,
  ): Promise<BatchImagesResponseDto> {
    try {
      const userId = req.user?.id;
      if (!userId) {
        throw new BadRequestException('User not authenticated');
      }

      const batchImages = await this.imagesService.getBatchImages(batchId, userId);
      return batchImages;
    } catch (error) {
      if (
        error instanceof BadRequestException ||
        error instanceof ForbiddenException ||
        error instanceof NotFoundException
      ) {
        throw error;
      }
      throw new BadRequestException('Failed to get batch images');
    }
  }

  @Get(':imageId/download')
  @ApiOperation({
    summary: 'Get image download URL',
    description: 'Returns a presigned URL for downloading the original or processed image',
  })
  @ApiResponse({
    status: HttpStatus.OK,
    description: 'Download URL generated successfully',
    schema: {
      type: 'object',
      properties: {
        download_url: {
          type: 'string',
          example: 'https://storage.example.com/images/processed/image.jpg?expires=...',
        },
        expires_at: {
          type: 'string',
          example: '2024-01-01T13:00:00.000Z',
        },
        filename: {
          type: 'string',
          example: 'modern-kitchen-renovation.jpg',
        },
      },
    },
  })
  @ApiResponse({
    status: HttpStatus.NOT_FOUND,
    description: 'Image not found',
  })
  @ApiResponse({
    status: HttpStatus.FORBIDDEN,
    description: 'Not authorized to download this image',
  })
  async getImageDownloadUrl(
    @Param('imageId') imageId: string,
    @Request() req: any,
  ): Promise<{
    download_url: string;
    expires_at: string;
    filename: string;
  }> {
    try {
      const userId = req.user?.id;
      if (!userId) {
        throw new BadRequestException('User not authenticated');
      }

      const downloadInfo = await this.imagesService.getImageDownloadUrl(imageId, userId);
      return downloadInfo;
    } catch (error) {
      if (
        error instanceof BadRequestException ||
        error instanceof ForbiddenException ||
        error instanceof NotFoundException
      ) {
        throw error;
      }
      throw new BadRequestException('Failed to generate download URL');
    }
  }

  @Put(':imageId/approve')
  @ApiOperation({
    summary: 'Approve proposed filename',
    description: 'Approves the AI-generated proposed filename as the final filename',
  })
  @ApiResponse({
    status: HttpStatus.OK,
    description: 'Filename approved successfully',
    type: UpdateFilenameResponseDto,
  })
  @ApiResponse({
    status: HttpStatus.NOT_FOUND,
    description: 'Image not found',
  })
  @ApiResponse({
    status: HttpStatus.BAD_REQUEST,
    description: 'No proposed filename to approve',
  })
  async approveFilename(
    @Param('imageId') imageId: string,
    @Request() req: any,
  ): Promise<UpdateFilenameResponseDto> {
    try {
      const userId = req.user?.id;
      if (!userId) {
        throw new BadRequestException('User not authenticated');
      }

      const result = await this.imagesService.approveProposedFilename(imageId, userId);
      return result;
    } catch (error) {
      if (
        error instanceof BadRequestException ||
        error instanceof ForbiddenException ||
        error instanceof NotFoundException
      ) {
        throw error;
      }
      throw new BadRequestException('Failed to approve filename');
    }
  }

  @Put(':imageId/revert')
  @ApiOperation({
    summary: 'Revert to original filename',
    description: 'Reverts the image filename back to the original uploaded filename',
  })
  @ApiResponse({
    status: HttpStatus.OK,
    description: 'Filename reverted successfully',
    type: UpdateFilenameResponseDto,
  })
  @ApiResponse({
    status: HttpStatus.NOT_FOUND,
    description: 'Image not found',
  })
  async revertFilename(
    @Param('imageId') imageId: string,
    @Request() req: any,
  ): Promise<UpdateFilenameResponseDto> {
    try {
      const userId = req.user?.id;
      if (!userId) {
        throw new BadRequestException('User not authenticated');
      }

      const result = await this.imagesService.revertToOriginalFilename(imageId, userId);
      return result;
    } catch (error) {
      if (
        error instanceof BadRequestException ||
        error instanceof ForbiddenException ||
        error instanceof NotFoundException
      ) {
        throw error;
      }
      throw new BadRequestException('Failed to revert filename');
    }
  }
}