/*!
 * Copyright 2015 Google Inc. All Rights Reserved.
 *
 * 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.
 */

'use strict';

const common = require('@google-cloud/common');
const {promisifyAll} = require('@google-cloud/promisify');

/**
 * A Firewall object allows you to interact with a Google Compute Engine
 * firewall.
 *
 * @see [Firewalls Overview]{@link https://cloud.google.com/compute/docs/networking#firewalls}
 * @see [Firewall Resource]{@link https://cloud.google.com/compute/docs/reference/v1/firewalls}
 *
 * @class
 * @param {Compute} compute
 * @param {string} name
 *
 * @example
 * const Compute = require('@google-cloud/compute');
 * const compute = new Compute();
 * const firewall = compute.firewall('tcp-3000');
 */
class Firewall extends common.ServiceObject {
  constructor(compute, name) {
    const methods = {
      /**
       * Create a firewall.
       *
       * @method Firewall#create
       * @param {object} config - See {@link Compute#createFirewall}.
       *
       * @example
       * const Compute = require('@google-cloud/compute');
       * const compute = new Compute();
       * const firewall = compute.firewall('tcp-3000');
       *
       * const config = {
       *   // ...
       * };
       *
       * firewall.create(config, function(err, firewall, operation, apiResponse) {
       *   // `firewall` is a Firewall object.
       *
       *   // `operation` is an Operation object that can be used to check the
       *   // status of the request.
       * });
       *
       * //-
       * // If the callback is omitted, we'll return a Promise.
       * //-
       * firewall.create(config).then(function(data) {
       *   const firewall = data[0];
       *   const operation = data[1];
       *   const apiResponse = data[2];
       * });
       */
      create: true,
      /**
       * Check if the firewall exists.
       *
       * @method Firewall#exists
       * @param {function} callback - The callback function.
       * @param {?error} callback.err - An error returned while making this
       *     request.
       * @param {boolean} callback.exists - Whether the firewall exists or not.
       *
       * @example
       * const Compute = require('@google-cloud/compute');
       * const compute = new Compute();
       * const firewall = compute.firewall('tcp-3000');
       *
       * firewall.exists(function(err, exists) {});
       *
       * //-
       * // If the callback is omitted, we'll return a Promise.
       * //-
       * firewall.exists().then(function(data) {
       *   const exists = data[0];
       * });
       */
      exists: true,
      /**
       * Get a firewall if it exists.
       *
       * You may optionally use this to "get or create" an object by providing an
       * object with `autoCreate` set to `true`. Any extra configuration that is
       * normally required for the `create` method must be contained within this
       * object as well.
       *
       * @method Firewall#get
       * @param {options=} options - Configuration object.
       * @param {boolean} options.autoCreate - Automatically create the object if
       *     it does not exist. Default: `false`
       *
       * @example
       * const Compute = require('@google-cloud/compute');
       * const compute = new Compute();
       * const firewall = compute.firewall('tcp-3000');
       *
       * firewall.get(function(err, firewall, apiResponse) {
       *   // `firewall` is a Firewall object.
       * });
       *
       * //-
       * // If the callback is omitted, we'll return a Promise.
       * //-
       * firewall.get().then(function(data) {
       *   const firewall = data[0];
       *   const apiResponse = data[1];
       * });
       */
      get: true,
      /**
       * Get the firewall's metadata.
       *
       * @see [Firewalls: get API Documentation]{@link https://cloud.google.com/compute/docs/reference/v1/firewalls/get}
       * @see [Firewall Resource]{@link https://cloud.google.com/compute/docs/reference/v1/firewalls}
       *
       * @method Firewall#getMetadata
       * @param {function=} callback - The callback function.
       * @param {?error} callback.err - An error returned while making this
       *     request.
       * @param {object} callback.metadata - The firewall's metadata.
       * @param {object} callback.apiResponse - The full API response.
       *
       * @example
       * const Compute = require('@google-cloud/compute');
       * const compute = new Compute();
       * const firewall = compute.firewall('tcp-3000');
       *
       * firewall.getMetadata(function(err, metadata, apiResponse) {});
       *
       * //-
       * // If the callback is omitted, we'll return a Promise.
       * //-
       * firewall.getMetadata().then(function(data) {
       *   const metadata = data[0];
       *   const apiResponse = data[1];
       * });
       */
      getMetadata: true,
    };
    super({
      parent: compute,
      baseUrl: '/global/firewalls',
      /**
       * @name Firewall#id
       * @type {string}
       */
      id: name,
      createMethod: compute.createFirewall.bind(compute),
      methods: methods,
    });
    /**
     * The parent {@link Compute} instance of this {@link Firewall} instance.
     * @name Firewall#compute
     * @type {Compute}
     */
    this.compute = compute;
    /**
     * @name Firewall#name
     * @type {string}
     */
    this.name = name;
    /**
     * @name Firewall#metadata
     * @type {object}
     */
    this.metadata.network = 'global/networks/default';
  }
  /**
   * Delete the firewall.
   *
   * @see [Firewalls: delete API Documentation]{@link https://cloud.google.com/compute/docs/reference/v1/firewalls/delete}
   *
   * @param {function=} callback - The callback function.
   * @param {?error} callback.err - An error returned while making this request.
   * @param {Operation} callback.operation - An operation object
   *     that can be used to check the status of the request.
   * @param {object} callback.apiResponse - The full API response.
   *
   * @example
   * const Compute = require('@google-cloud/compute');
   * const compute = new Compute();
   * const firewall = compute.firewall('tcp-3000');
   *
   * firewall.delete(function(err, operation, apiResponse) {
   *   // `operation` is an Operation object that can be used to check the status
   *   // of the request.
   * });
   *
   * //-
   * // If the callback is omitted, we'll return a Promise.
   * //-
   * firewall.delete().then(function(data) {
   *   const operation = data[0];
   *   const apiResponse = data[1];
   * });
   */
  delete(callback) {
    const compute = this.compute;
    callback = callback || common.util.noop;
    super.delete(function(err, resp) {
      if (err) {
        callback(err, null, resp);
        return;
      }
      const operation = compute.operation(resp.name);
      operation.metadata = resp;
      callback(null, operation, resp);
    });
  }
  /**
   * Set the firewall's metadata.
   *
   * @see [Firewall Resource]{@link https://cloud.google.com/compute/docs/reference/v1/firewalls}
   *
   * @param {object} metadata - See a
   *     [Firewall resource](https://cloud.google.com/compute/docs/reference/v1/firewalls).
   * @param {function=} callback - The callback function.
   * @param {?error} callback.err - An error returned while making this request.
   * @param {Operation} callback.operation - An operation object
   *     that can be used to check the status of the request.
   * @param {object} callback.apiResponse - The full API response.
   *
   * @example
   * const Compute = require('@google-cloud/compute');
   * const compute = new Compute();
   * const firewall = compute.firewall('tcp-3000');
   *
   * const metadata = {
   *   description: 'New description'
   * };
   *
   * firewall.setMetadata(metadata, function(err, operation, apiResponse) {
   *   // `operation` is an Operation object that can be used to check the status
   *   // of the request.
   * });
   *
   * //-
   * // If the callback is omitted, we'll return a Promise.
   * //-
   * firewall.setMetadata(metadata).then(function(data) {
   *   const operation = data[0];
   *   const apiResponse = data[1];
   * });
   */
  setMetadata(metadata, callback) {
    const compute = this.compute;
    callback = callback || common.util.noop;
    metadata = metadata || {};
    metadata.name = this.name;
    metadata.network = metadata.network || this.metadata.network;
    this.request(
      {
        method: 'PATCH',
        uri: '',
        json: metadata,
      },
      function(err, resp) {
        if (err) {
          callback(err, null, resp);
          return;
        }
        const operation = compute.operation(resp.name);
        operation.metadata = resp;
        callback(null, operation, resp);
      }
    );
  }
}

/*! Developer Documentation
 *
 * All async methods (except for streams) will return a Promise in the event
 * that a callback is omitted.
 */
promisifyAll(Firewall);

/**
 * Reference to the {@link Firewall} class.
 * @name module:@google-cloud/compute.Firewall
 * @see Firewall
 */
module.exports = Firewall;