import type { IGetMediaPresenter, GetMediaResult } from '@core/media/application/presenters/IGetMediaPresenter';
import type { GetMediaOutputDTO } from '../dtos/GetMediaOutputDTO';

// The HTTP-facing DTO (or null when not found)
export type GetMediaViewModel = GetMediaOutputDTO | null;

export class GetMediaPresenter implements IGetMediaPresenter {
  private result: GetMediaResult | null = null;

  present(result: GetMediaResult) {
    this.result = result;
  }

  get viewModel(): GetMediaViewModel {
    if (!this.result || !this.result.success || !this.result.media) {
      return null;
    }

    const media = this.result.media;

    return {
      id: media.id,
      url: media.url,
      type: media.type,
      // Best-effort mapping from arbitrary metadata
      category: (media.metadata as { category?: string } | undefined)?.category,
      uploadedAt: media.uploadedAt,
      size: media.size,
    };
  }
}