import { MediaRequestStatus, MediaStatus } from '@server/constants/media';
import { getRepository } from '@server/datasource';
import Media from '@server/entity/Media';
import { MediaRequest } from '@server/entity/MediaRequest';
import type { EntitySubscriberInterface, UpdateEvent } from 'typeorm';
import { EventSubscriber } from 'typeorm';

@EventSubscriber()
export class MediaSubscriber implements EntitySubscriberInterface<Media> {
  private async updateChildRequestStatus(event: Media, is4k: boolean) {
    const requestRepository = getRepository(MediaRequest);

    const requests = await requestRepository.find({
      where: { media: { id: event.id } },
    });

    for (const request of requests) {
      if (
        request.is4k === is4k &&
        request.status === MediaRequestStatus.PENDING
      ) {
        request.status = MediaRequestStatus.APPROVED;
        await requestRepository.save(request);
      }
    }
  }

  public beforeUpdate(event: UpdateEvent<Media>): void {
    if (!event.entity) {
      return;
    }

    if (
      event.entity.status === MediaStatus.AVAILABLE &&
      event.databaseEntity.status === MediaStatus.PENDING
    ) {
      this.updateChildRequestStatus(event.entity as Media, false);
    }

    if (
      event.entity.status4k === MediaStatus.AVAILABLE &&
      event.databaseEntity.status4k === MediaStatus.PENDING
    ) {
      this.updateChildRequestStatus(event.entity as Media, true);
    }
  }

  public listenTo(): typeof Media {
    return Media;
  }
}