/*
 * Copyright 2020 Spotify AB
 *
 * 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 fs from 'fs-extra';
import { ReaderOutput } from '../types';
import { LocationSource } from './types';
import { readDescriptorYaml } from './util';

export class FileLocationSource implements LocationSource {
  async read(target: string): Promise<ReaderOutput[]> {
    let rawYaml;
    try {
      rawYaml = await fs.readFile(target, 'utf8');
    } catch (e) {
      throw new Error(`Unable to read "${target}", ${e}`);
    }

    try {
      return readDescriptorYaml(rawYaml);
    } catch (e) {
      throw new Error(`Malformed descriptor at "${target}", ${e}`);
    }
  }
}
