import { InjectQueue } from '@nestjs/bull';
import { Body, Controller, Get, NotFoundException, Param, Post } from '@nestjs/common';
import { QUEUE_NAME, ScreenshotsQueue } from './shared';

type CreateScreenshotJobDto = {
  pageUrl: URL,
  imageType: 'jpeg' | 'png'
}

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

  @Post()
  async createScreenshotJob(@Body() createScreenshotJobDto: CreateScreenshotJobDto) {
    const result = await this.screenshotsQueue.add(createScreenshotJobDto)
    return {
      jobId: result.id.toString()
    }
  }

  @Get(':id')
  async getJob(@Param('id') id: string) {
    const jobInfo = await this.screenshotsQueue.getJob(id)

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

    switch (await jobInfo.getState()) {
      case 'completed':
        return { status: 'completed' }
      case 'failed':
        return { status: 'failed' }
      default:
        return { status: 'queued' }
    }
  }

  @Get(':id/result')
  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
  }
}