import BaseEntity from '../../common/entities/BaseEntity';

export default abstract class File extends BaseEntity {
  static TYPE_IMAGE = 'TYPE_IMAGE';
  
  protected _url: string = null;
  protected _extension: string = null;
  protected _file_size_in_bytes: number = null;
  
  get url(): string {
    return this._url;
  }
  
  set url(value: string) {
    this._url = value;
  }
  
  get extension(): string {
    return this._extension;
  }
  
  set extension(value: string) {
    this._extension = value;
  }
  
  get file_size_in_bytes(): number {
    return this._file_size_in_bytes;
  }
  
  set file_size_in_bytes(value: number) {
    this._file_size_in_bytes = value;
  }
  
  isValid(): boolean {
    return this.invalidFields().length === 0;
  }
  
  invalidFields(): Array<string> {
    let fields = [];
    
    !this.url && fields.push('url');
    
    return fields;
  }
}