/**
 * Copyright 2013-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 * @providesModule CallbackQueue
 */

'use strict';

var _prodInvariant = require('./reactProdInvariant'),
    _assign = require('object-assign');

var PooledClass = require('./PooledClass');

var invariant = require('fbjs/lib/invariant');

/**
 * A specialized pseudo-event module to help keep track of components waiting to
 * be notified when their DOM representations are available for use.
 *
 * This implements `PooledClass`, so you should never need to instantiate this.
 * Instead, use `CallbackQueue.getPooled()`.
 *
 * @class ReactMountReady
 * @implements PooledClass
 * @internal
 */
function CallbackQueue() {
  this._callbacks = null;
  this._contexts = null;
}

_assign(CallbackQueue.prototype, {

  /**
   * Enqueues a callback to be invoked when `notifyAll` is invoked.
   *
   * @param {function} callback Invoked when `notifyAll` is invoked.
   * @param {?object} context Context to call `callback` with.
   * @internal
   */
  enqueue: function (callback, context) {
    this._callbacks = this._callbacks || [];
    this._contexts = this._contexts || [];
    this._callbacks.push(callback);
    this._contexts.push(context);
  },

  /**
   * Invokes all enqueued callbacks and clears the queue. This is invoked after
   * the DOM representation of a component has been created or updated.
   *
   * @internal
   */
  notifyAll: function () {
    var callbacks = this._callbacks;
    var contexts = this._contexts;
    if (callbacks) {
      !(callbacks.length === contexts.length) ? process.env.NODE_ENV !== 'production' ? invariant(false, 'Mismatched list of contexts in callback queue') : _prodInvariant('24') : void 0;
      this._callbacks = null;
      this._contexts = null;
      for (var i = 0; i < callbacks.length; i++) {
        callbacks[i].call(contexts[i]);
      }
      callbacks.length = 0;
      contexts.length = 0;
    }
  },

  checkpoint: function () {
    return this._callbacks ? this._callbacks.length : 0;
  },

  rollback: function (len) {
    if (this._callbacks) {
      this._callbacks.length = len;
      this._contexts.length = len;
    }
  },

  /**
   * Resets the internal queue.
   *
   * @internal
   */
  reset: function () {
    this._callbacks = null;
    this._contexts = null;
  },

  /**
   * `PooledClass` looks for this.
   */
  destructor: function () {
    this.reset();
  }

});

PooledClass.addPoolingTo(CallbackQueue);

module.exports = CallbackQueue;