/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

'use strict';

add_task(function* () {
  info('Creating a service');
  // Create a11y service.
  let a11yInit = initPromise();
  let accService1 = Cc['@mozilla.org/accessibilityService;1'].getService(
    Ci.nsIAccessibilityService);
  yield a11yInit;
  ok(accService1, 'Service initialized');

  // Add another reference to a11y service. This will not trigger
  // 'a11y-init-or-shutdown' event
  let accService2 = Cc['@mozilla.org/accessibilityService;1'].getService(
    Ci.nsIAccessibilityService);
  ok(accService2, 'Service initialized');

  info('Removing all service references');
  let canShutdown = false;
  // This promise will resolve only if canShutdonw flag is set to true. If
  // 'a11y-init-or-shutdown' event with '0' flag comes before it can be shut
  // down, the promise will reject.
  let a11yShutdown = new Promise((resolve, reject) =>
    shutdownPromise().then(flag => canShutdown ?
      resolve() : reject('Accessible service was shut down incorrectly')));
  // Remove first a11y service reference.
  accService1 = null;
  ok(!accService1, 'Service is removed');
  // Force garbage collection that should not trigger shutdown because there is
  // another reference.
  forceGC();

  // Have some breathing room when removing a11y service references.
  yield new Promise(resolve => executeSoon(resolve));

  // Now allow a11y service to shutdown.
  canShutdown = true;
  // Remove last a11y service reference.
  accService2 = null;
  ok(!accService2, 'Service is removed');
  // Force garbage collection that should trigger shutdown.
  forceGC();
  yield a11yShutdown;
});