/*
 * jQuery UI Selectable
 *
 * Copyright (c) 2008 Richard D. Worth (rdworth.org)
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 * 
 * http://docs.jquery.com/UI/Selectables
 *
 * Depends:
 *	ui.core.js
 */
(function($) {

$.widget("ui.selectable", $.extend({}, $.ui.mouse, {
	init: function() {
		var self = this;
		
		this.element.addClass("ui-selectable");
		
		this.dragged = false;

		// cache selectee children based on filter
		var selectees;
		this.refresh = function() {
			selectees = $(self.options.filter, self.element[0]);
			selectees.each(function() {
				var $this = $(this);
				var pos = $this.offset();
				$.data(this, "selectable-item", {
					element: this,
					$element: $this,
					left: pos.left,
					top: pos.top,
					right: pos.left + $this.width(),
					bottom: pos.top + $this.height(),
					startselected: false,
					selected: $this.hasClass('ui-selected'),
					selecting: $this.hasClass('ui-selecting'),
					unselecting: $this.hasClass('ui-unselecting')
				});
			});
		};
		this.refresh();

		this.selectees = selectees.addClass("ui-selectee");
		
		this.mouseInit();
		
		this.helper = $(document.createElement('div')).css({border:'1px dotted black'});
	},
	toggle: function() {
		if(this.options.disabled){
			this.enable();
		} else {
			this.disable();
		}
	},
	destroy: function() {
		this.element
			.removeClass("ui-selectable ui-selectable-disabled")
			.removeData("selectable")
			.unbind(".selectable");
		this.mouseDestroy();
	},
	mouseStart: function(e) {
		var self = this;
		
		this.opos = [e.pageX, e.pageY];
		
		if (this.options.disabled)
			return;

		var options = this.options;

		this.selectees = $(options.filter, this.element[0]);

		// selectable START callback
		this.element.triggerHandler("selectablestart", [e, {
			"selectable": this.element[0],
			"options": options
		}], options.start);

		$('body').append(this.helper);
		// position helper (lasso)
		this.helper.css({
			"z-index": 100,
			"position": "absolute",
			"left": e.clientX,
			"top": e.clientY,
			"width": 0,
			"height": 0
		});

		if (options.autoRefresh) {
			this.refresh();
		}

		this.selectees.filter('.ui-selected').each(function() {
			var selectee = $.data(this, "selectable-item");
			selectee.startselected = true;
			if (!e.ctrlKey) {
				selectee.$element.removeClass('ui-selected');
				selectee.selected = false;
				selectee.$element.addClass('ui-unselecting');
				selectee.unselecting = true;
				// selectable UNSELECTING callback
				self.element.triggerHandler("selectableunselecting", [e, {
					selectable: self.element[0],
					unselecting: selectee.element,
					options: options
				}], options.unselecting);
			}
		});
		
		var isSelectee = false;
		$(e.target).parents().andSelf().each(function() {
			if($.data(this, "selectable-item")) isSelectee = true;
		});
		return this.options.keyboard ? !isSelectee : true;
	},
	mouseDrag: function(e) {
		var self = this;
		this.dragged = true;
		
		if (this.options.disabled)
			return;

		var options = this.options;

		var x1 = this.opos[0], y1 = this.opos[1], x2 = e.pageX, y2 = e.pageY;
		if (x1 > x2) { var tmp = x2; x2 = x1; x1 = tmp; }
		if (y1 > y2) { var tmp = y2; y2 = y1; y1 = tmp; }
		this.helper.css({left: x1, top: y1, width: x2-x1, height: y2-y1});

		this.selectees.each(function() {
			var selectee = $.data(this, "selectable-item");
			//prevent helper from being selected if appendTo: selectable
			if (!selectee || selectee.element == self.element[0])
				return;
			var hit = false;
			if (options.tolerance == 'touch') {
				hit = ( !(selectee.left > x2 || selectee.right < x1 || selectee.top > y2 || selectee.bottom < y1) );
			} else if (options.tolerance == 'fit') {
				hit = (selectee.left > x1 && selectee.right < x2 && selectee.top > y1 && selectee.bottom < y2);
			}

			if (hit) {
				// SELECT
				if (selectee.selected) {
					selectee.$element.removeClass('ui-selected');
					selectee.selected = false;
				}
				if (selectee.unselecting) {
					selectee.$element.removeClass('ui-unselecting');
					selectee.unselecting = false;
				}
				if (!selectee.selecting) {
					selectee.$element.addClass('ui-selecting');
					selectee.selecting = true;
					// selectable SELECTING callback
					self.element.triggerHandler("selectableselecting", [e, {
						selectable: self.element[0],
						selecting: selectee.element,
						options: options
					}], options.selecting);
				}
			} else {
				// UNSELECT
				if (selectee.selecting) {
					if (e.ctrlKey && selectee.startselected) {
						selectee.$element.removeClass('ui-selecting');
						selectee.selecting = false;
						selectee.$element.addClass('ui-selected');
						selectee.selected = true;
					} else {
						selectee.$element.removeClass('ui-selecting');
						selectee.selecting = false;
						if (selectee.startselected) {
							selectee.$element.addClass('ui-unselecting');
							selectee.unselecting = true;
						}
						// selectable UNSELECTING callback
						self.element.triggerHandler("selectableunselecting", [e, {
							selectable: self.element[0],
							unselecting: selectee.element,
							options: options
						}], options.unselecting);
					}
				}
				if (selectee.selected) {
					if (!e.ctrlKey && !selectee.startselected) {
						selectee.$element.removeClass('ui-selected');
						selectee.selected = false;

						selectee.$element.addClass('ui-unselecting');
						selectee.unselecting = true;
						// selectable UNSELECTING callback
						self.element.triggerHandler("selectableunselecting", [e, {
							selectable: self.element[0],
							unselecting: selectee.element,
							options: options
						}], options.unselecting);
					}
				}
			}
		});
		
		return false;
	},
	mouseStop: function(e) {
		var self = this;
		
		this.dragged = false;
		
		var options = this.options;

		$('.ui-unselecting', this.element[0]).each(function() {
			var selectee = $.data(this, "selectable-item");
			selectee.$element.removeClass('ui-unselecting');
			selectee.unselecting = false;
			selectee.startselected = false;
			self.element.triggerHandler("selectableunselected", [e, {
				selectable: self.element[0],
				unselected: selectee.element,
				options: options
			}], options.unselected);
		});
		$('.ui-selecting', this.element[0]).each(function() {
			var selectee = $.data(this, "selectable-item");
			selectee.$element.removeClass('ui-selecting').addClass('ui-selected');
			selectee.selecting = false;
			selectee.selected = true;
			selectee.startselected = true;
			self.element.triggerHandler("selectableselected", [e, {
				selectable: self.element[0],
				selected: selectee.element,
				options: options
			}], options.selected);
		});
		this.element.triggerHandler("selectablestop", [e, {
			selectable: self.element[0],
			options: this.options
		}], this.options.stop);
		
		this.helper.remove();
		
		return false;
	}
}));

$.extend($.ui.selectable, {
	defaults: {
		distance: 1,
		delay: 0,
		cancel: ":input",
		appendTo: 'body',
		autoRefresh: true,
		filter: '*',
		tolerance: 'touch'
	}
});

})(jQuery);