/* Copyright 2017 Mozilla Foundation
 *
 * 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';
var OverlayManager = {
 overlays: {},
 active: null,
 register: function overlayManagerRegister(name, element, callerCloseMethod, canForceClose) {
  return new Promise(function (resolve) {
   var container;
   if (!name || !element || !(container = element.parentNode)) {
    throw new Error('Not enough parameters.');
   } else if (this.overlays[name]) {
    throw new Error('The overlay is already registered.');
   }
   this.overlays[name] = {
    element: element,
    container: container,
    callerCloseMethod: callerCloseMethod || null,
    canForceClose: canForceClose || false
   };
   resolve();
  }.bind(this));
 },
 unregister: function overlayManagerUnregister(name) {
  return new Promise(function (resolve) {
   if (!this.overlays[name]) {
    throw new Error('The overlay does not exist.');
   } else if (this.active === name) {
    throw new Error('The overlay cannot be removed while it is active.');
   }
   delete this.overlays[name];
   resolve();
  }.bind(this));
 },
 open: function overlayManagerOpen(name) {
  return new Promise(function (resolve) {
   if (!this.overlays[name]) {
    throw new Error('The overlay does not exist.');
   } else if (this.active) {
    if (this.overlays[name].canForceClose) {
     this._closeThroughCaller();
    } else if (this.active === name) {
     throw new Error('The overlay is already active.');
    } else {
     throw new Error('Another overlay is currently active.');
    }
   }
   this.active = name;
   this.overlays[this.active].element.classList.remove('hidden');
   this.overlays[this.active].container.classList.remove('hidden');
   window.addEventListener('keydown', this._keyDown);
   resolve();
  }.bind(this));
 },
 close: function overlayManagerClose(name) {
  return new Promise(function (resolve) {
   if (!this.overlays[name]) {
    throw new Error('The overlay does not exist.');
   } else if (!this.active) {
    throw new Error('The overlay is currently not active.');
   } else if (this.active !== name) {
    throw new Error('Another overlay is currently active.');
   }
   this.overlays[this.active].container.classList.add('hidden');
   this.overlays[this.active].element.classList.add('hidden');
   this.active = null;
   window.removeEventListener('keydown', this._keyDown);
   resolve();
  }.bind(this));
 },
 _keyDown: function overlayManager_keyDown(evt) {
  var self = OverlayManager;
  if (self.active && evt.keyCode === 27) {
   self._closeThroughCaller();
   evt.preventDefault();
  }
 },
 _closeThroughCaller: function overlayManager_closeThroughCaller() {
  if (this.overlays[this.active].callerCloseMethod) {
   this.overlays[this.active].callerCloseMethod();
  }
  if (this.active) {
   this.close(this.active);
  }
 }
};
exports.OverlayManager = OverlayManager;