// (C) Copyright 2015 Martin Dougiamas
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import { Pipe, PipeTransform } from '@angular/core';
import { CoreLoggerProvider } from '@providers/logger';
import { CoreTextUtilsProvider } from '@providers/utils/text';

/**
 * Pipe to turn a number in bytes to a human readable size (e.g. 5,25 MB).
 */
@Pipe({
    name: 'coreBytesToSize',
})
export class CoreBytesToSizePipe implements PipeTransform {
    protected logger;

    constructor(logger: CoreLoggerProvider, private textUtils: CoreTextUtilsProvider) {
        this.logger = logger.getInstance('CoreBytesToSizePipe');
    }

    /**
     * Takes a number and turns it to a human readable size.
     *
     * @param {number|string} value The bytes to convert.
     * @return {string} Readable bytes.
     */
    transform(value: number | string): string {
        if (typeof value == 'string') {
            // Convert the value to a number.
            const numberValue = parseInt(value, 10);
            if (isNaN(numberValue)) {
                this.logger.error('Invalid value received', value);

                return value;
            }
            value = numberValue;
        }

        return this.textUtils.bytesToSize(value);
    }
}