import BaseEntityService from '../../common/services/BaseEntityService/BaseEntityService';
import FileServiceInterface from './FileServiceInterface';
import FileClientInterface from '../clients/FileClientInterface';
import RequestPromise from '../../common/DTO/RequestPromise';
import HTTPRequest from '../../Request/entity/HTTPRequest';
import FileFactoryInterface from '../factories/FileFactoryInterface';
import DigitalFile from '../entity/File';

export default abstract class FileService extends BaseEntityService<DigitalFile> implements FileServiceInterface {
  constructor(client: FileClientInterface, transformer: FileFactoryInterface) {
    super(client, transformer);
  }
  
  protected uploadFile(file: File, instance: DigitalFile): RequestPromise {
    let formData = new FormData();
    formData.append('file', file, file.name);
    formData.append('data', JSON.stringify(this.transformer.transformToPayload(instance)));

    const httpRequest = new HTTPRequest();
    httpRequest.data = formData;
    const requestPromise = (<FileClientInterface>this.client).upload(httpRequest);

    return new RequestPromise(
      requestPromise.requestId,
      new Promise(resolve => {
        requestPromise.promise.then(response => {
          resolve(instance.id)
        });
      })
    );
  }
}