import {
  BadRequestException,
  Body,
  Controller,
  Get,
  Param,
  ParseIntPipe,
  Post,
  Query,
  UseInterceptors,
  ValidationPipe,
  NotFoundException,
  InternalServerErrorException,
  UploadedFile,
  Logger,
  Inject,
  ForbiddenException
} from '@nestjs/common';
import { ApiResponse } from '@nestjs/swagger';

import { CloneImageDto, CloneImageResponseDto, ImageDetailDto, ImageListOptions, ImageListItemResponse } from '.';
import { ResponseDto } from '@lxdhub/interfaces';
import { ImageService } from './image.service';
import { ImageListItemInterceptor } from './interceptors/image-list-item.interceptor';
import { FileInterceptor } from '@nestjs/platform-express';
import { LXDHubAPISettings } from '../main';
import { ImportImageDto } from './dtos/import-image.dto';

/**
 * The Image Controller, which is the API
 * interface for Image-Operations.
 */
@Controller('/api/v1/image')
export class ImageController {
  private logger;
  constructor(
    private readonly imageService: ImageService,
    @Inject('LXDHubAPISettings')
    private settings: LXDHubAPISettings
  ) {
    this.logger = new Logger('image.controller');
  }

  /**
   * Returns images, limited by the given pagination options and
   * filters it by the given remoteId.
   * If remoteId is not given, it takes the first remote.
   * @param options The options to paginate through the requested data
   */
  @Get('/')
  @UseInterceptors(ImageListItemInterceptor)
  @ApiResponse({ status: 200, description: 'The images have been successfully requested' })
  @ApiResponse({ status: 400, description: 'Bad Request' })
  @ApiResponse({ status: 404, description: 'Remote not found' })
  async findByRemote(
    @Query(new ValidationPipe({ transform: true }))
    options: ImageListOptions
  ): Promise<ImageListItemResponse> {
    try {
      // Fetches the images
      return await this.imageService
        .findByRemote(options.remote, options, options.query ? options.query.trim() : null);
    }
    catch (err) {
      if (err instanceof TypeError) {
        // Is a search query error
        throw new BadRequestException(err.message);
      } else if (err instanceof NotFoundException) {
        // Not found
        throw err;
      } else {
        // Unknwon error. Should not occur
        throw new InternalServerErrorException('Internal Server Error');
      }
    }
  }

  /**
   * Returns a detail image with the given id
   * @param {number} fingerprint The fingerprint of the image
   */
  @Get('/:fingerprint')
  @ApiResponse({ status: 200, description: 'The image have been successfully requested' })
  @ApiResponse({ status: 400, description: 'Bad Request' })
  async findOne(
    @Param('fingerprint')
    fingerprint: string
  ): Promise<ResponseDto<ImageDetailDto>> {
    return await this.imageService.findOne(fingerprint);
  }

  /**
   * Clones the image with the given id
   * @param {number} id The id of the image
   */
  @Post('/:id/clone')
  @ApiResponse({ status: 200, description: 'The image have been successfully cloned' })
  @ApiResponse({ status: 404, description: 'Not Found' })
  @ApiResponse({ status: 403, description: 'Not Authorized' })
  @ApiResponse({ status: 500, description: 'The destination LXD remote is not reachable' })
  async clone(
    // Convert id to an integer
    @Param('id', new ParseIntPipe())
    id: number,
    @Body()
    cloneImageDto: CloneImageDto
  )
    : Promise<ResponseDto<CloneImageResponseDto>> {
    return await this.imageService.cloneImage(id, cloneImageDto);
  }

  @Post('/')
  @ApiResponse({ status: 200, description: 'The image was imported successfully' })
  @UseInterceptors(FileInterceptor('image'))
  async import(
    @UploadedFile()
    image,
    @Body()
    body: ImportImageDto
  ) {
    if (this.settings.upload) {
      return await this.imageService.importImage(image, body.remote, body.aliases);
    } else {
      throw new ForbiddenException('Image upload is disabled!');
    }
  }
}