/**
 * Copyright 2014 Facebook, Inc.
 *
 * 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.
 *
 * @providesModule LocalEventTrapMixin
 */

"use strict";

var ReactEventEmitter = require('ReactEventEmitter');

var accumulate = require('accumulate');
var forEachAccumulated = require('forEachAccumulated');
var invariant = require('invariant');

function remove(event) {
  event.remove();
}

var LocalEventTrapMixin = {
  trapBubbledEvent(topLevelType, handlerBaseName) {
    invariant(this.isMounted(), 'Must be mounted to trap events');
    var listener = ReactEventEmitter.trapBubbledEvent(
      topLevelType,
      handlerBaseName,
      this.getDOMNode()
    );
    this._localEventListeners = accumulate(this._localEventListeners, listener);
  },

  // trapCapturedEvent would look nearly identical. We don't implement that
  // method because it isn't currently needed.

  componentWillUnmount() {
    if (this._localEventListeners) {
      forEachAccumulated(this._localEventListeners, remove);
    }
  }
};

module.exports = LocalEventTrapMixin;
