'use strict';

/**
 * Licensed Materials - Property of IBM
 * IBM Cognos Products: Storytelling
 * (C) Copyright IBM Corp. 2014, 2018
 * US Government Users Restricted Rights - Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
 */

define(['baglass/core-client/js/core-client/ui/core/Class', 'underscore'], function (Class, _) {

	/**
  * Base controller for scene transitions.
  * Rejects calls while transitions are in progress.
  * Subclasses override '_next' and '_previous' to perform transitions
  */
	var TransitionController = Class.extend({

		_deck: [],

		init: function init() {
			TransitionController.inherited('init', this, arguments);
		},

		jumpTo: function jumpTo(from, to) {
			var _this = this;

			return this._beforeJump(from, to).then(function () {
				return _this._jump(from, to);
			}).then(function () {
				return _this._afterJump(from, to);
			}).then(function () {
				return { overview: to.id === 'end' || to.id === 'start' };
			}).catch(function (err) {
				return _this._afterJump(from, to).then(function () {
					return Promise.reject(err);
				});
			});
		},

		forward: function forward(from, to) {
			var _this2 = this;

			return this._beforeNext(from, to).then(function () {
				return _this2._next(from, to);
			}).then(function () {
				return _this2._afterNext(from, to);
			}).then(function () {
				return { overview: false };
			});
		},

		backward: function backward(from, to) {
			var _this3 = this;

			return this._beforePrevious(from, to).then(function () {
				return _this3._previous(from, to);
			}).then(function () {
				return _this3._afterPrevious(from, to);
			}).then(function () {
				return { overview: false };
			});
		},

		_beforeJump: function _beforeJump(from, to) {
			this._setNextSceneScrollPosition(from, to);
			return Promise.resolve();
		},

		_jump: function _jump() {
			return Promise.resolve();
		},

		_afterJump: function _afterJump() {
			return Promise.resolve();
		},

		_beforeNext: function _beforeNext(from, to) {
			this._setNextSceneScrollPosition(from, to);
			return Promise.resolve();
		},

		_next: function _next() {
			return Promise.resolve();
		},

		_afterNext: function _afterNext() {
			return Promise.resolve();
		},

		_beforePrevious: function _beforePrevious(from, to) {
			this._setNextSceneScrollPosition(from, to);
			return Promise.resolve();
		},

		_previous: function _previous() {
			return Promise.resolve();
		},

		_afterPrevious: function _afterPrevious() {
			return Promise.resolve();
		},

		_setNextSceneScrollPosition: function _setNextSceneScrollPosition(from, to) {
			if (from && to && from.getLayoutView && to.getLayoutView) {
				var fromSceneScrollPosition = from.getLayoutView().$el.scrollTop();
				to.getLayoutView().$el.scrollTop(fromSceneScrollPosition);
			}
		},

		deckScenes: function deckScenes(scenes) {
			var _this4 = this;

			var setOnDeck = function setOnDeck($el) {
				if ($el.length) {
					$el.addClass('onDeck');
					$el.removeClass('hiddenScene');
				}
			};
			_.each(scenes, function (scene) {
				setOnDeck(scene.$el);
				_this4._showWidgets(scene);
				_this4._hideWidgets(scene);
			});
			this._deck = scenes;
		},

		undeckScenes: function undeckScenes(scenes) {
			var _this5 = this;

			var setOffDeck = function setOffDeck($el) {
				if ($el.length) {
					$el.removeClass('onDeck');
					$el.addClass('hiddenScene');
					$el.attr('aria-hidden', 'true');
				}
			};
			_.each(scenes, function (scene) {
				if (!(_this5._deck.indexOf(scene) !== -1)) {
					setOffDeck(scene.$el);
				}
			});
		},

		_hideWidgets: function _hideWidgets(view) {
			if (view && view.getLayoutView) {
				view.getLayoutView().onHide();
			}
		},

		_showWidgets: function _showWidgets(view) {
			if (view && view.getLayoutView) {
				view.getLayoutView().onShow();
			}
		}
	});

	return TransitionController;
});
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