import { InjectQueue } from '@nestjs/bull';
import { Body, Controller, Get, NotFoundException, Param, Post } from '@nestjs/common';
import { ApiResponse } from '@nestjs/swagger';
import { CreateJobRequestDto, GetJobResponseDto, JobStatusDto } from './screenshots.dto'
import { QUEUE_NAME, ScreenshotsQueue } from './shared';

@Controller('screenshots')
export class ScreenshotsController {
  constructor(@InjectQueue(QUEUE_NAME) private readonly screenshotsQueue: ScreenshotsQueue) {}

  @Post()
  async createScreenshotJob(@Body() createScreenshotJobDto: CreateJobRequestDto): Promise<{ jobId: string }> {
    const result = await this.screenshotsQueue.add({
      pageUrl: new URL(createScreenshotJobDto.pageUrl),
      imageType: createScreenshotJobDto.imageType,
    })
    return {
      jobId: result.id.toString()
    }
  }

  @Get(':id')
  @ApiResponse({ status: 404 })
  async getJob(@Param('id') id: string): Promise<GetJobResponseDto> {
    const jobInfo = await this.screenshotsQueue.getJob(id)

    if (!jobInfo) {
      throw new NotFoundException()
    }

    switch (await jobInfo.getState()) {
      case 'completed':
        return { status: JobStatusDto.Completed }
      case 'failed':
        return { status: JobStatusDto.Failed }
      default:
        return { status: JobStatusDto.Queued }
    }
  }

  @Get(':id/result')
  @ApiResponse({ status: 404 })
  async getScreenshot(@Param('id') id: string) {
    const jobInfo = await this.screenshotsQueue.getJob(id)

    if (!jobInfo) {
      throw new NotFoundException()
    }

    if (!await jobInfo.isCompleted()) {
      throw new NotFoundException()
    }

    return await jobInfo.returnvalue
  }
}