/*
 * Copyright (c) 2016 Internap.
 *
 * 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 AbstractService from './util/abstractService'

/**
 * A list of all supported versions. Please keep this array sorted by most recent.
 *
 * @type {Array}
 * @ignore
 */
const supportedNeutronVersions = [
  'v2.0'
]

export default class Neutron extends AbstractService {
  /**
   * This class provides direct, idempotent, low-level access to the Neutron API of a specific
   * cloud. The constructor requires that you provide a specific neutron interface endpoint
   * descriptor, as received from keystone's catalog list.
   *
   * @example
   * {
   *   region_id: "RegionOne",
   *   url: "http://127.0.0.1:9696",
   *   region: "RegionOne",
   *   interface: "admin",
   *   id: "4f08823e667345478b6e40fab8373c0f"
   * }
   * @param {{}} endpointConfig The configuration element for a specific glance endpoint.
   */
  constructor (endpointConfig) {
    // Sanity checks.
    if (!endpointConfig || !endpointConfig.url) {
      throw new Error('An endpoint configuration is required.')
    }
    // Clone the config, so that this instance is immutable
    // at runtime (no modifying the config after the fact).
    endpointConfig = Object.assign({}, endpointConfig)

    super(endpointConfig.url, supportedNeutronVersions)
  }

  /**
   * List the networks available on neutron.
   *
   * @param {String} token An authorization token, or a promise which will resolve into one.
   * @returns {Promise.<T>} A promise which will resolve with the list of networks.
   */
  networkList (token = null) {
    return this
      ._requestComponents(token)
      .then(([url, headers]) => this.http.httpRequest('GET', `${url}/networks`, headers))
      .then((response) => response.json())
      .then((body) => body.networks)
  }
}