/*!
 * dragtable
 *
 * @Version 2.0.15
 *
 * Copyright (c) 2010-2013, Andres akottr@gmail.com
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 *
 * Inspired by the the dragtable from Dan Vanderkam (danvk.org/dragtable/)
 * Thanks to the jquery and jqueryui comitters
 *
 * Any comment, bug report, feature-request is welcome
 * Feel free to contact me.
 *
 * sabello : Updated to remove .attr('checked') in order to comply with jQuery deprecation of this use of .attr
 *
 */

/* TOKNOW:
 * For IE7 you need this css rule:
 * table {
 *   border-collapse: collapse;
 * }
 * Or take a clean reset.css (see http://meyerweb.com/eric/tools/css/reset/)
 */

/* TODO: investigate
 * Does not work properly with css rule:
 * html {
 *      overflow: -moz-scrollbars-vertical;
 *  }
 * Workaround:
 * Fixing Firefox issues by scrolling down the page
 * http://stackoverflow.com/questions/2451528/jquery-ui-sortable-scroll-helper-element-offset-firefox-issue
 *
 * var start = $.noop;
 * var beforeStop = $.noop;
 * if($.browser.mozilla) {
 * var start = function (event, ui) {
 *               if( ui.helper !== undefined )
 *                 ui.helper.css('position','absolute').css('margin-top', $(window).scrollTop() );
 *               }
 * var beforeStop = function (event, ui) {
 *              if( ui.offset !== undefined )
 *                ui.helper.css('margin-top', 0);
 *              }
 * }
 *
 * and pass this as start and stop function to the sortable initialisation
 * start: start,
 * beforeStop: beforeStop
 */
/*
 * Special thx to all pull requests comitters
 */

(function($) {
	$.widget("akottr.dragtable", {
		options: {
			revert: false,               // smooth revert
			dragHandle: '.table-handle', // handle for moving cols, if not exists the whole 'th' is the handle
			maxMovingRows: 40,           // 1 -> only header. 40 row should be enough, the rest is usually not in the viewport
			excludeFooter: false,        // excludes the footer row(s) while moving other columns. Make sense if there is a footer with a colspan. */
			onlyHeaderThreshold: 100,    // TODO:  not implemented yet, switch automatically between entire col moving / only header moving
			dragaccept: null,            // draggable cols -> default all
			persistState: null,          // url or function -> plug in your custom persistState function right here. function call is persistState(originalTable)
			restoreState: null,          // JSON-Object or function:  some kind of experimental aka Quick-Hack TODO: do it better
			exact: true,                 // removes pixels, so that the overlay table width fits exactly the original table width
			clickDelay: 10,              // ms to wait before rendering sortable list and delegating click event
			containment: null,           // @see http://api.jqueryui.com/sortable/#option-containment, use it if you want to move in 2 dimesnions (together with axis: null)
			cursor: 'move',              // @see http://api.jqueryui.com/sortable/#option-cursor
			cursorAt: false,             // @see http://api.jqueryui.com/sortable/#option-cursorAt
			distance: 0,                 // @see http://api.jqueryui.com/sortable/#option-distance, for immediate feedback use "0"
			tolerance: 'pointer',        // @see http://api.jqueryui.com/sortable/#option-tolerance
			axis: 'x',                   // @see http://api.jqueryui.com/sortable/#option-axis, Only vertical moving is allowed. Use 'x' or null. Use this in conjunction with the 'containment' setting
			beforeStart: $.noop,         // returning FALSE will stop the execution chain.
			beforeMoving: $.noop,
			beforeReorganize: $.noop,
			beforeStop: $.noop
		},
		originalTable: {
			el: null,
			selectedHandle: null,
			sortOrder: null,
			startIndex: 0,
			endIndex: 0
		},
		sortableTable: {
			el: $(),
			selectedHandle: $(),
			movingRow: $()
		},
		persistState: function() {
			var _this = this;
			this.originalTable.el.find('th').each(function(i) {
				if (this.id !== '') {
					_this.originalTable.sortOrder[this.id] = i;
				}
			});
			$.ajax({
				url: this.options.persistState,
				data: this.originalTable.sortOrder
			});
		},
		/*
		 * persistObj looks like
		 * {'id1':'2','id3':'3','id2':'1'}
		 * table looks like
		 * |   id2  |   id1   |   id3   |
		 */
		_restoreState: function(persistObj) {
			for (var n in persistObj) {
				this.originalTable.startIndex = $('#' + n).closest('th').prevAll().length + 1;
				this.originalTable.endIndex = parseInt(persistObj[n], 10) + 1;
				this._bubbleCols();
			}
		},
		// bubble the moved col left or right
		_bubbleCols: function() {
			var i, j, col1, col2;
			var from = this.originalTable.startIndex;
			var to = this.originalTable.endIndex;
			/* Find children thead and tbody.
			 * Only to process the immediate tr-children. Bugfix for inner tables
			 */
			var thtb = this.originalTable.el.children();
			if (this.options.excludeFooter) {
				thtb = thtb.not('tfoot');
			}
			if (from < to) {
				for (i = from; i < to; i++) {
					col1 = thtb.find('> tr > td:nth-child(' + i + ')')
						.add(thtb.find('> tr > th:nth-child(' + i + ')'));
					col2 = thtb.find('> tr > td:nth-child(' + (i + 1) + ')')
						.add(thtb.find('> tr > th:nth-child(' + (i + 1) + ')'));
					for (j = 0; j < col1.length; j++) {
						swapNodes(col1[j], col2[j]);
					}
				}
			} else {
				for (i = from; i > to; i--) {
					col1 = thtb.find('> tr > td:nth-child(' + i + ')')
						.add(thtb.find('> tr > th:nth-child(' + i + ')'));
					col2 = thtb.find('> tr > td:nth-child(' + (i - 1) + ')')
						.add(thtb.find('> tr > th:nth-child(' + (i - 1) + ')'));
					for (j = 0; j < col1.length; j++) {
						swapNodes(col1[j], col2[j]);
					}
				}
			}
		},
		_rearrangeTableBackroundProcessing: function() {
			var _this = this;
			return function() {
				_this._bubbleCols();
				_this.options.beforeStop(_this.originalTable);
				_this.sortableTable.el.remove();
				restoreTextSelection();
				// persist state if necessary
				if (_this.options.persistState !== null) {
					(typeof( _this.options.persistState) === 'function') ? _this.options.persistState(_this.originalTable) : _this.persistState();
				}
			};
		},
		_rearrangeTable: function() {
			var _this = this;
			return function() {
				// remove handler-class -> handler is now finished
				_this.originalTable.selectedHandle.removeClass('dragtable-handle-selected');
				// add disabled class -> reorgorganisation starts soon
				_this.sortableTable.el.sortable("disable");
				_this.sortableTable.el.addClass('dragtable-disabled');
				_this.options.beforeReorganize(_this.originalTable, _this.sortableTable);
				// do reorganisation asynchronous
				// for chrome a little bit more than 1 ms because we want to force a rerender
				_this.originalTable.endIndex = _this.sortableTable.movingRow.prevAll().length + 1;
				setTimeout(_this._rearrangeTableBackroundProcessing(), 50);
			};
		},
		/*
		 * Disrupts the table. The original table stays the same.
		 * But on a layer above the original table we are constructing a list (ul > li)
		 * each li with a separate table representig a single col of the original table.
		 */
		_generateSortable: function(e) {
			!e.cancelBubble && (e.cancelBubble = true);
			var _this = this;
			// table attributes
			var attrs = this.originalTable.el[0].attributes;
			var attrsString = '';
			for (var i = 0; i < attrs.length; i++) {
				if (attrs[i].nodeValue && attrs[i].nodeName != 'id' && attrs[i].nodeName != 'width') {
					attrsString += attrs[i].nodeName + '="' + attrs[i].nodeValue + '" ';
				}
			}

			// row attributes
			var rowAttrsArr = [];
			//compute height, special handling for ie needed :-(
			var heightArr = [];
			this.originalTable.el.find('tr').slice(0, this.options.maxMovingRows).each(function(i, v) {
				// row attributes
				var attrs = this.attributes;
				var attrsString = "";
				for (var j = 0; j < attrs.length; j++) {
					if (attrs[j].nodeValue && attrs[j].nodeName != 'id') {
						attrsString += " " + attrs[j].nodeName + '="' + attrs[j].nodeValue + '"';
					}
				}
				rowAttrsArr.push(attrsString);
				heightArr.push($(this).height());
			});

			// compute width, no special handling for ie needed :-)
			var widthArr = [];
			// compute total width, needed for not wrapping around after the screen ends (floating)
			var totalWidth = 0;
			/* Find children thead and tbody.
			 * Only to process the immediate tr-children. Bugfix for inner tables
			 */
			var thtb = _this.originalTable.el.children();
			if (this.options.excludeFooter) {
				thtb = thtb.not('tfoot');
			}
			thtb.find('> tr > th').each(function(i, v) {
				var w = $(this).is(':visible') ? $(this).outerWidth() : 0;
				widthArr.push(w);
				totalWidth += w;
			});
			if(_this.options.exact) {
				var difference = totalWidth - _this.originalTable.el.outerWidth();
				widthArr[0] -= difference;
			}
			// one extra px on right and left side
			totalWidth += 2

			var sortableHtml = '<ul class="dragtable-sortable" style="position:absolute; width:' + totalWidth + 'px;">';
			// assemble the needed html
			thtb.find('> tr > th').each(function(i, v) {
				var width_li = $(this).is(':visible') ? $(this).outerWidth() : 0;
				sortableHtml += '<li style="width:' + width_li + 'px;">';
				sortableHtml += '<table ' + attrsString + '>';
				var row = thtb.find('> tr > th:nth-child(' + (i + 1) + ')');
				if (_this.options.maxMovingRows > 1) {
					row = row.add(thtb.find('> tr > td:nth-child(' + (i + 1) + ')').slice(0, _this.options.maxMovingRows - 1));
				}
				row.each(function(j) {
					// TODO: May cause duplicate style-Attribute
					var row_content = $(this).clone().wrap('<div></div>').parent().html();
					if (row_content.toLowerCase().indexOf('<th') === 0) sortableHtml += "<thead>";
					sortableHtml += '<tr ' + rowAttrsArr[j] + '" style="height:' + heightArr[j] + 'px;">';
					sortableHtml += row_content;
					if (row_content.toLowerCase().indexOf('<th') === 0) sortableHtml += "</thead>";
					sortableHtml += '</tr>';
				});
				sortableHtml += '</table>';
				sortableHtml += '</li>';
			});
			sortableHtml += '</ul>';
			this.sortableTable.el = this.originalTable.el.before(sortableHtml).prev();
			// set width if necessary
			this.sortableTable.el.find('> li > table').each(function(i, v) {
				$(this).css('width', widthArr[i] + 'px');
			});

			// assign this.sortableTable.selectedHandle
			this.sortableTable.selectedHandle = this.sortableTable.el.find('th .dragtable-handle-selected');

			var items = !this.options.dragaccept ? 'li' : 'li:has(' + this.options.dragaccept + ')';
			this.sortableTable.el.sortable({
				items: items,
				stop: this._rearrangeTable(),
				// pass thru options for sortable widget
				revert: this.options.revert,
				tolerance: this.options.tolerance,
				containment: this.options.containment,
				cursor: this.options.cursor,
				cursorAt: this.options.cursorAt,
				distance: this.options.distance,
				axis: this.options.axis
			});

			// assign start index
			this.originalTable.startIndex = $(e.target).closest('th').prevAll().length + 1;

			this.options.beforeMoving(this.originalTable, this.sortableTable);
			// Start moving by delegating the original event to the new sortable table
			this.sortableTable.movingRow = this.sortableTable.el.find('> li:nth-child(' + this.originalTable.startIndex + ')');

			// prevent the user from drag selecting "highlighting" surrounding page elements
			disableTextSelection();
			// clone the initial event and trigger the sort with it
			this.sortableTable.movingRow.trigger($.extend($.Event(e.type), {
				which: 1,
				clientX: e.clientX,
				clientY: e.clientY,
				pageX: e.pageX,
				pageY: e.pageY,
				screenX: e.screenX,
				screenY: e.screenY
			}));

			// Some inner divs to deliver the posibillity to style the placeholder more sophisticated
			var placeholder = this.sortableTable.el.find('.ui-sortable-placeholder');
			if(!placeholder.height()  <= 0) {
				placeholder.css('height', this.sortableTable.el.find('.ui-sortable-helper').height());
			}

			placeholder.html('<div class="outer" style="height:100%;"><div class="inner" style="height:100%;"></div></div>');
		},
		bindTo: {},
		_create: function() {
			this.originalTable = {
				el: this.element,
				selectedHandle: $(),
				sortOrder: {},
				startIndex: 0,
				endIndex: 0
			};
			// bind draggable to 'th' by default
			this.bindTo = this.originalTable.el.find('th');
			// filter only the cols that are accepted
			if (this.options.dragaccept) {
				this.bindTo = this.bindTo.filter(this.options.dragaccept);
			}
			// bind draggable to handle if exists
			if (this.bindTo.find(this.options.dragHandle).length > 0) {
				this.bindTo = this.bindTo.find(this.options.dragHandle);
			}
			// restore state if necessary
			if (this.options.restoreState !== null) {
				(typeof( _this.options.restoreState) === 'function') ? this.options.restoreState(this.originalTable) : this._restoreState(this.options.restoreState);
			}
			var _this = this;
			this.bindTo.mousedown(function(evt) {
				// listen only to left mouse click
				if(evt.which!==1) return;
				if (_this.options.beforeStart(_this.originalTable) === false) {
					return;
				}
				clearTimeout(this.downTimer);
				this.downTimer = setTimeout(function() {
					_this.originalTable.selectedHandle = $(this);
					_this.originalTable.selectedHandle.addClass('dragtable-handle-selected');
					_this._generateSortable(evt);
				}, _this.options.clickDelay);
			}).mouseup(function(evt) {
				clearTimeout(this.downTimer);
			});
		},
		redraw: function(){
			this.destroy();
			this._create();
		},
		destroy: function() {
			this.bindTo.off('mousedown');
			$.Widget.prototype.destroy.apply(this, arguments); // default destroy
			// now do other stuff particular to this widget
		}
	});

	/** closure-scoped "private" functions **/

	var body_onselectstart_save = $(document.body).attr('onselectstart'),
		body_unselectable_save = $(document.body).attr('unselectable');

	// css properties to disable user-select on the body tag by appending a <style> tag to the <head>
	// remove any current document selections

	function disableTextSelection() {
		// jQuery doesn't support the element.text attribute in MSIE 8
		// http://stackoverflow.com/questions/2692770/style-style-textcss-appendtohead-does-not-work-in-ie
		var $style = $('<style id="__dragtable_disable_text_selection__" type="text/css">body { -ms-user-select:none;-moz-user-select:-moz-none;-khtml-user-select:none;-webkit-user-select:none;user-select:none; }</style>');
		$(document.head).append($style);
		$(document.body).attr('onselectstart', 'return false;').attr('unselectable', 'on');
		if (window.getSelection) {
			window.getSelection().removeAllRanges();
		} else {
			document.selection.empty(); // MSIE http://msdn.microsoft.com/en-us/library/ms535869%28v=VS.85%29.aspx
		}
	}

	// remove the <style> tag, and restore the original <body> onselectstart attribute

	function restoreTextSelection() {
		$('#__dragtable_disable_text_selection__').remove();
		if (body_onselectstart_save) {
			$(document.body).attr('onselectstart', body_onselectstart_save);
		} else {
			$(document.body).removeAttr('onselectstart');
		}
		if (body_unselectable_save) {
			$(document.body).attr('unselectable', body_unselectable_save);
		} else {
			$(document.body).removeAttr('unselectable');
		}
	}

	function swapNodes(a, b) {
		var aparent = a.parentNode;
		var asibling = a.nextSibling === b ? a : a.nextSibling;
		b.parentNode.insertBefore(a, b);
		aparent.insertBefore(b, asibling);
	}
})(jQuery);
