/********************************************************************************
 * Copyright (c) 2015-2018 Contributors to the Eclipse Foundation
 *
 * See the NOTICE file(s) distributed with this work for additional
 * information regarding copyright ownership.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 ********************************************************************************/

import { Pipe, PipeTransform } from '@angular/core';
// this projects imports
import { FormatSize } from '../model/file-explorer.model';

@Pipe({name: 'fileSize'})
export class FileSizePipe implements PipeTransform {

    constructor() {}

    public transform(bytes: number | string, format?: FormatSize) {
      let result = '-';
      if (typeof(bytes) === 'string') {
        result = bytes;
      } else {
        if (bytes == undefined) {
          result = '-';
        }
        if (format == undefined) {
            format = FormatSize.BINARY;
        }
        if (Math.abs(bytes) < format) {
          result =  bytes + ' B';
        }
        let units: string[];
        switch (format) {
            case FormatSize.DECIMAL:
            units = ['kB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];
            break;
            case FormatSize.BINARY:
            units = ['KiB', 'MiB', 'GiB', 'TiB', 'PiB', 'EiB', 'ZiB', 'YiB'];
        }
        let u = -1;
        do {
            bytes /= format;
            ++u;
        } while (Math.abs(bytes) >= format && u < units.length - 1);
        result = bytes.toFixed(1) + ' ' + units[u];
      }
      return result;
    }
}