/* Copyright 2017 Mozilla Foundation
 *
 * 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 { CMapCompressionType } from '../../src/shared/util';

class NodeCMapReaderFactory {
  constructor({ baseUrl = null, isCompressed = false, }) {
    this.baseUrl = baseUrl;
    this.isCompressed = isCompressed;
  }

  fetch({ name, }) {
    if (!name) {
      return Promise.reject(new Error('CMap name must be specified.'));
    }
    return new Promise((resolve, reject) => {
      let url = this.baseUrl + name + (this.isCompressed ? '.bcmap' : '');

      let fs = require('fs');
      fs.readFile(url, (error, data) => {
        if (error || !data) {
          reject(new Error('Unable to load ' +
                           (this.isCompressed ? 'binary ' : '') +
                           'CMap at: ' + url));
          return;
        }
        resolve({
          cMapData: new Uint8Array(data),
          compressionType: this.isCompressed ?
            CMapCompressionType.BINARY : CMapCompressionType.NONE,
        });
      });
    });
  }
}

export {
  NodeCMapReaderFactory,
};