/*
 * Copyright (C) 2016 Bilibili. All Rights Reserved.
 *
 * @author zheng qian <xqq@xqq.im>
 *
 * 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 SeekRange from '../Interfaces/SeekRange';
import Headers from '../Interfaces/UserHeaders';

class RangeSeekHandler {
    _zeroStart: boolean | number

    constructor(zeroStart: number | boolean) {
        this._zeroStart = zeroStart || false;
    }

    getConfig(url: string, range: SeekRange): { url: string; headers: Headers } {
        const headers: Headers = { Range: '' };

        if(range.from !== 0 || range.to !== -1) {
            let param;
            if(range.to !== -1) {
                param = `bytes=${range.from.toString()}-${range.to.toString()}`;
            } else {
                param = `bytes=${range.from.toString()}-`;
            }
            headers.Range = param;
        } else if(this._zeroStart) {
            headers.Range = 'bytes=0-';
        }

        return {
            url,
            headers
        };
    }

    removeURLParameters(seekedURL: string): string {
        return seekedURL;
    }
}

export default RangeSeekHandler;