# all files / src/gatherers/ offline.js

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     /**
     * @license
     * Copyright 2016 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.
     */

    /* global XMLHttpRequest, __returnResults */

    'use strict';

    const Gather = require('./gather');

    // *WARNING* do not use fetch.. due to it requiring window focus to fire.
    // Request the current page by issuing a XMLHttpRequest request to ''
    // and storing the status code on the window.
    const requestPage = function() {
      const oReq = new XMLHttpRequest();
      oReq.onload = oReq.onerror = e => {
        // __returnResults is injected by driver.evaluateAsync
        __returnResults(e.currentTarget.status);
      };
      oReq.open('GET', '');
      oReq.send();
    };

    class Offline extends Gather {
      get name() {
        return 'offlineResponseCode';
      }

      static goOffline(driver) {
        return driver.sendCommand('Network.emulateNetworkConditions', {
          offline: true,
          // values of 0 remove any active throttling. crbug.com/456324#c9
          latency: 0,
          downloadThroughput: 0,
          uploadThroughput: 0
        });
      }

      static goOnline(driver) {
        return driver.sendCommand('Network.emulateNetworkConditions', {
          offline: false,
          latency: 0,
          downloadThroughput: 0,
          uploadThroughput: 0
        });
      }

      afterReloadPageLoad(options) {
        const driver = options.driver;

        // TODO eventually we will want to walk all network
        // requests that the page initially made and retry them.
        return Offline
            .goOffline(driver)
            .then(_ => driver.evaluateAsync(`(${requestPage.toString()}())`))
            .then(offlineResponseCode => {
              this.artifact = offlineResponseCode;
            })
            .then(_ => Offline.goOnline(driver));
      }
    }

    module.exports = Offline;