/*
 * Copyright (c) 2014
 *
 * @author Vincent Petry
 * @copyright 2014 Vincent Petry <pvince81@owncloud.com>
 *
 * Edited by: Felix Nüsse <felix.nuesse@t-online.de> 2018
 *
 * This file is licensed under the Affero General Public License version 3
 * or later.
 *
 * See the COPYING-README file.
 *
 */

(function() {

	/**
	 * @class OCA.Files.Navigation
	 * @classdesc Navigation control for the files app sidebar.
	 *
	 * @param $el element containing the navigation
	 */
	var Navigation = function($el) {
		this.initialize($el);
	};

	/**
	 * @memberof OCA.Files
	 */
	Navigation.prototype = {

		/**
		 * Currently selected item in the list
		 */
		_activeItem: null,

		/**
		 * Currently selected container
		 */
		$currentContent: null,

		/**
		 * Strategy by which the quickaccesslist is sorted
		 */
		$sortingStrategy: 'alphabet',
		/**
		 * Initializes the navigation from the given container
		 *
		 * @private
		 * @param $el element containing the navigation
		 */
		initialize: function($el) {
			this.$el = $el;
			this._activeItem = null;
			this.$currentContent = null;
			this._setupEvents();
			this.initialSort();
		},

		/**
		 * Setup UI events
		 */
		_setupEvents: function() {
			this.$el.on('click', 'li a', _.bind(this._onClickItem, this))
			this.$el.on('click', 'li button', _.bind(this._onClickMenuButton, this));
			this.$el.on('click', 'li input', _.bind(this._onClickMenuItem, this));
		},

		/**
		 * Returns the container of the currently active app.
		 *
		 * @return app container
		 */
		getActiveContainer: function() {
			return this.$currentContent;
		},

		/**
		 * Returns the currently active item
		 * 
		 * @return item ID
		 */
		getActiveItem: function() {
			return this._activeItem;
		},

		/**
		 * Switch the currently selected item, mark it as selected and
		 * make the content container visible, if any.
		 *
		 * @param string itemId id of the navigation item to select
		 * @param array options "silent" to not trigger event
		 */
		setActiveItem: function(itemId, options) {
			var oldItemId = this._activeItem;
			if (itemId === this._activeItem) {
				if (!options || !options.silent) {
					this.$el.trigger(
						new $.Event('itemChanged', {itemId: itemId, previousItemId: oldItemId})
					);
				}
				return;
			}
			this.$el.find('li').removeClass('active');
			if (this.$currentContent) {
				this.$currentContent.addClass('hidden');
				this.$currentContent.trigger(jQuery.Event('hide'));
			}
			this._activeItem = itemId;
			this.$el.find('li[data-id=' + itemId + ']').addClass('active');
			this.$currentContent = $('#app-content-' + itemId);
			this.$currentContent.removeClass('hidden');
			if (!options || !options.silent) {
				this.$currentContent.trigger(jQuery.Event('show'));
				this.$el.trigger(
					new $.Event('itemChanged', {itemId: itemId, previousItemId: oldItemId})
				);
			}
		},

		/**
		 * Returns whether a given item exists
		 */
		itemExists: function(itemId) {
			return this.$el.find('li[data-id=' + itemId + ']').length;
		},

		/**
		 * Event handler for when clicking on an item.
		 */
		_onClickItem: function(ev) {
			var $target = $(ev.target);
			var itemId = $target.closest('li').attr('data-id');
			if (!_.isUndefined(itemId)) {
				this.setActiveItem(itemId);
			}
			ev.preventDefault();
		},
		/**
		 * Event handler for when clicking on an three-dot-menu.
		 */
		_onClickMenuButton: function(ev) {
			var $target = $(ev.target);
			var itemId = $target.closest('button').attr('id');
			var qaSelector= '#quickaccess-list';

			if(itemId==='button-collapseQuickAccess'){

				document.getElementById('enableQuickAccess').checked=!document.getElementById('enableQuickAccess').checked;
				$.get(OC.generateUrl("/apps/files/api/v1/showquickaccess"),  {show: document.getElementById('enableQuickAccess').checked}, function(data, status){
				});

				$("#favorites-toggle" ).toggleClass('open');

			}

			if(itemId==='button-favorites'){
				document.getElementById('menu-favorites').classList.toggle('open');
			}
			ev.preventDefault();
		},

		/**
		 * Event handler for when clicking on a menuitem.
		 */
		_onClickMenuItem: function(ev) {

			var qaSelector= '#quickaccess-list';
			var qaKey= 'quickaccess-list';

			var itemId = $(ev.target).closest('input').attr('id');
			var list = document.getElementById(qaKey).getElementsByTagName('li');

			if(itemId==='enableQuickAccess' ){
				$.get(OC.generateUrl("/apps/files/api/v1/showquickaccess"),  {show: document.getElementById('enableQuickAccess').checked}, function(data, status){
				});
				$("#favorites-toggle" ).toggleClass('open');
				document.getElementById('menu-favorites').classList.toggle('open');
			}

			if(itemId==='sortByAlphabet'){
				//Prevents deselecting Group-Item
				if(!document.getElementById('sortByAlphabet').checked){
					ev.preventDefault();
					return;
				}
				this.sortingStrategy='alphabet';
				document.getElementById('sortByDate').checked=false;
				$.get(OC.generateUrl("/apps/files/api/v1/setsortingstrategy"), {strategy: this.sortingStrategy}, function(data, status){});
				this.QuickSort(list, 0, list.length - 1);
				document.getElementById('menu-favorites').classList.toggle('open');
			}

			if(itemId==='sortByDate'){
				//Prevents deselecting Group-Item
				if(!document.getElementById('sortByDate').checked){
					ev.preventDefault();
					return;
				}
				this.sortingStrategy='date';
				document.getElementById('sortByAlphabet').checked=false;
				$.get(OC.generateUrl("/apps/files/api/v1/setsortingstrategy"), {strategy: this.sortingStrategy}, function(data, status){});
				this.QuickSort(list, 0, list.length - 1);
				document.getElementById('menu-favorites').classList.toggle('open');
			}

			if(itemId==='enableReverse'){
				this.reverse(list);
				var state = document.getElementById('enableReverse').checked;
				$.get(OC.generateUrl("/apps/files/api/v1/setreversequickaccess"), {reverse: state}, function(data, status){});
				document.getElementById('menu-favorites').classList.toggle('open');
			}
			//ev.preventDefault();
		},

		/**
		 * Sort initially as setup of sidebar for QuickAccess
		 */
		initialSort: function() {

			var domRevState=document.getElementById('enableReverse').checked;
			var domSortAlphabetState=document.getElementById('sortByAlphabet').checked;
			var domSortDateState=document.getElementById('sortByDate').checked;

			var qaKey= 'quickaccess-list';
			var list = document.getElementById(qaKey).getElementsByTagName('li');

			if(domSortAlphabetState){
				this.sortingStrategy='alphabet';
			}
			if(domSortDateState){
				this.sortingStrategy='date';
			}

			this.QuickSort(list, 0, list.length - 1);

			if(domRevState){
				this.reverse(list);
			}

			/*This creates flashes the UI, which is bad userexperience. It is the cleaner way to do it, that is why i haven't deleted it yet.
			var scope=this;
			$.get(OC.generateUrl("/apps/files/api/v1/getsortingstrategy"), function(data, status){
				scope.sortingStrategy=data;
				scope.QuickSort(list, 0, list.length - 1);

			});

			$.get(OC.generateUrl("/apps/files/api/v1/getreversequickaccess"), function(data, status){
				if(data){
					scope.reverse(list);
				}
			});
			*/
		},

		/**
		 * Sorting-Algorithm for QuickAccess
		 */
		QuickSort: function(list, start, end) {
			var lastmatch;
			if(list.length > 1){
				lastmatch = this.quicksort_helper(list, start, end);
				if(start < lastmatch - 1){
					this.QuickSort(list, start, lastmatch - 1);
				}
				if(lastmatch < end){
					this.QuickSort(list, lastmatch, end);
				}
			}
		},

		/**
		 * Sorting-Algorithm-Helper for QuickAccess
		 */
		quicksort_helper: function(list, start, end) {
			var pivot = Math.floor((end + start) / 2);
			var pivotelem = this.getCompareValue(list,pivot);
			var	i = start;
			var	j = end;

			while(i <= j){
				while(this.getCompareValue(list,i) < pivotelem){
					i++;
				}
				while(this.getCompareValue(list,j) > pivotelem){
					j--;
				}
				if(i <= j){
					this.swap(list, i, j);
					i++;
					j--;
				}
			}
			return i;
		},

		/**
		 * Sorting-Algorithm-Helper for QuickAccess
		 * This method allows easy access to the element which is sorted by.
		 */
		getCompareValue: function(nodes, int){
			if(this.sortingStrategy==='alphabet'){
				return nodes[int].getElementsByTagName('a')[0].innerHTML.toLowerCase();
			}else if(this.sortingStrategy==='date'){
				return nodes[int].getAttribute('folderPos').toLowerCase();
			}
			return nodes[int].getElementsByTagName('a')[0].innerHTML.toLowerCase();
		},

		/**
		 * Sorting-Algorithm-Helper for QuickAccess
		 * This method allows easy swapping of elements.
		 */
		swap: function(list, j, i){
			list[i].before(list[j]);
			list[j].before(list[i]);
		},

		/**
		 * Reverse QuickAccess-List
		 */
		reverse: function(list){
			var len=list.length-1;
			for(var i = 0; i < len/2; i++) {
				this.swap(list, i, len-i);
			}
		}

	};

	OCA.Files.Navigation = Navigation;

})();