/**
 * Interface Elements for jQuery
 * Draggable
 * 
 * http://interface.eyecon.ro
 * 
 * Copyright (c) 2006 Stefan Petre
 * Dual licensed under the MIT (MIT-LICENSE.txt) 
 * and GPL (GPL-LICENSE.txt) licenses.
 *   
 *
 */

jQuery.iDrag =	{
	helper : null,
	dragged: null,
	destroy : function()
	{
		return this.each(
			function ()
			{
				if (this.isDraggable) {
					this.dragElem = null;
					this.isDraggable=false;
					jQuery(this).unbind('mousedown', jQuery.iDrag.dragstart);
				}
			}
		);
	},
	draginit : function (e)
	{
		if (jQuery.iDrag.dragged != null) {
			jQuery.iDrag.dragstop(e);
			return false;
		}
		var elm = this.dragElem;
		jQuery(document)
			.bind('mousemove', jQuery.iDrag.dragmove)
			.bind('mouseup', jQuery.iDrag.dragstop);
		elm.dragCfg.pointer = jQuery.iUtil.getPointer(e);
		elm.dragCfg.currentPointer = elm.dragCfg.pointer;
		elm.dragCfg.init = false;
		elm.dragCfg.fromHandler = this != this.dragElem;
		jQuery.iDrag.dragged = elm;
		if (elm.dragCfg.si && this != this.dragElem) {
				parentPos = jQuery.iUtil.getPosition(elm.parentNode);
				sliderSize = jQuery.iUtil.getSize(elm);
				sliderPos = {
					x : parseInt(jQuery.css(elm,'left')) || 0,
					y : parseInt(jQuery.css(elm,'top')) || 0
				};
				dx = elm.dragCfg.currentPointer.x - parentPos.x - sliderSize.wb/2 - sliderPos.x;
				dy = elm.dragCfg.currentPointer.y - parentPos.y - sliderSize.hb/2 - sliderPos.y;
				jQuery.iSlider.dragmoveBy(elm, [dx, dy]);
		}
		return false;
	},
	
	dragstart : function(e)
	{
		elm = jQuery.iDrag.dragged;
		elm.dragCfg.init = true;
		
		dEs = elm.style;
		
		elm.dragCfg.oD = jQuery.css(elm,'display');
		elm.dragCfg.oP = jQuery.css(elm,'position');
		if (!elm.dragCfg.initialPosition)
			elm.dragCfg.initialPosition = elm.dragCfg.oP;

		elm.dragCfg.oR = {
			x : parseInt(jQuery.css(elm,'left')) || 0,
			y : parseInt(jQuery.css(elm,'top')) || 0
		};
		elm.dragCfg.diffX = 0;
		elm.dragCfg.diffY = 0;
		if (jQuery.browser.msie) {
			oldBorder = jQuery.iUtil.getBorder(elm, true);
			elm.dragCfg.diffX = oldBorder.l||0;
			elm.dragCfg.diffY = oldBorder.t||0;
		}
		
		elm.dragCfg.oC = jQuery.extend(
			jQuery.iUtil.getPosition(elm),
			jQuery.iUtil.getSize(elm)
		);
		if (elm.dragCfg.oP != 'relative' && elm.dragCfg.oP != 'absolute') {
			dEs.position = 'relative';
		}
		
		jQuery.iDrag.helper.empty();
		
		clonedEl = elm.cloneNode(true);
	
		jQuery(clonedEl).css(
			{
				display:	'block',
				left:		'0px',
				top: 		'0px'
			}
		);
		clonedEl.style.marginTop = '0';
		clonedEl.style.marginRight = '0';
		clonedEl.style.marginBottom = '0';
		clonedEl.style.marginLeft = '0';
		jQuery.iDrag.helper.append(clonedEl);
		
		if (elm.dragCfg.onStart)
			elm.dragCfg.onStart.apply(elm, [clonedEl]);
		
		dhs = jQuery.iDrag.helper.get(0).style;

		if (elm.dragCfg.autoSize) {
			dhs.width = 'auto';
			dhs.height = 'auto';
		} else {
			dhs.height = elm.dragCfg.oC.hb + 'px';
			dhs.width = elm.dragCfg.oC.wb + 'px';
		}
		
		dhs.display = 'block';
		dhs.marginTop = '0px';
		dhs.marginRight = '0px';
		dhs.marginBottom = '0px';
		dhs.marginLeft = '0px';
		
		//remeasure the clone to check if the size was changed by user's functions
		jQuery.extend(
			elm.dragCfg.oC,
			jQuery.iUtil.getSize(clonedEl)
		);
		
		if (elm.dragCfg.cursorAt) {
			if (elm.dragCfg.cursorAt.left) {
				elm.dragCfg.oR.x += elm.dragCfg.pointer.x - elm.dragCfg.oC.x - elm.dragCfg.cursorAt.left;
				elm.dragCfg.oC.x = elm.dragCfg.pointer.x - elm.dragCfg.cursorAt.left;
			}
			if (elm.dragCfg.cursorAt.top) {
				elm.dragCfg.oR.y += elm.dragCfg.pointer.y - elm.dragCfg.oC.y - elm.dragCfg.cursorAt.top;
				elm.dragCfg.oC.y = elm.dragCfg.pointer.y - elm.dragCfg.cursorAt.top;
			}
			if (elm.dragCfg.cursorAt.right) {
				elm.dragCfg.oR.x += elm.dragCfg.pointer.x - elm.dragCfg.oC.x -elm.dragCfg.oC.hb + elm.dragCfg.cursorAt.right;
				elm.dragCfg.oC.x = elm.dragCfg.pointer.x - elm.dragCfg.oC.wb + elm.dragCfg.cursorAt.right;
			}
			if (elm.dragCfg.cursorAt.bottom) {
				elm.dragCfg.oR.y += elm.dragCfg.pointer.y - elm.dragCfg.oC.y - elm.dragCfg.oC.hb + elm.dragCfg.cursorAt.bottom;
				elm.dragCfg.oC.y = elm.dragCfg.pointer.y - elm.dragCfg.oC.hb + elm.dragCfg.cursorAt.bottom;
			}
		}
		elm.dragCfg.nx = elm.dragCfg.oR.x;
		elm.dragCfg.ny = elm.dragCfg.oR.y;
		
		if (elm.dragCfg.insideParent || elm.dragCfg.containment == 'parent') {
			parentBorders = jQuery.iUtil.getBorder(elm.parentNode, true);
			elm.dragCfg.oC.x = elm.offsetLeft + (jQuery.browser.msie ? 0 : jQuery.browser.opera ? -parentBorders.l : parentBorders.l);
			elm.dragCfg.oC.y = elm.offsetTop + (jQuery.browser.msie ? 0 : jQuery.browser.opera ? -parentBorders.t : parentBorders.t);
			jQuery(elm.parentNode).append(jQuery.iDrag.helper.get(0));
		}
		if (elm.dragCfg.containment) {
			jQuery.iDrag.getContainment(elm);
			elm.dragCfg.onDrag.containment = jQuery.iDrag.fitToContainer;
		}
		
		if (elm.dragCfg.si) {
			jQuery.iSlider.modifyContainer(elm);
		}
			
		dhs.left = elm.dragCfg.oC.x - elm.dragCfg.diffX + 'px';
		dhs.top = elm.dragCfg.oC.y - elm.dragCfg.diffY + 'px';
		//resize the helper to fit the clone
		dhs.width = elm.dragCfg.oC.wb + 'px';
		dhs.height = elm.dragCfg.oC.hb + 'px';
		
		jQuery.iDrag.dragged.dragCfg.prot = false;
		
		if (elm.dragCfg.gx) {
			elm.dragCfg.onDrag.grid = jQuery.iDrag.snapToGrid;
		}
		if (elm.dragCfg.zIndex != false) {
			jQuery.iDrag.helper.css('zIndex', elm.dragCfg.zIndex);
		}
		if (elm.dragCfg.opacity) {
			jQuery.iDrag.helper.css('opacity', elm.dragCfg.opacity);
			if (window.ActiveXObject) {
				jQuery.iDrag.helper.css('filter', 'alpha(opacity=' + elm.dragCfg.opacity * 100 + ')');
			}
		}
		if (elm.dragCfg.ghosting == false) {
			dEs.display = 'none';
		}
		if (jQuery.iDrop && jQuery.iDrop.count > 0 ){
			jQuery.iDrop.highlight(elm);
		}
		return false;
	},
	
	getContainment : function(elm)
	{
		if (elm.dragCfg.containment.constructor == String) {
			if (elm.dragCfg.containment == 'parent') {
				elm.dragCfg.cont = jQuery.extend(
					{x:0,y:0},
					jQuery.iUtil.getSize(elm.parentNode)
				);
				contBorders = jQuery.iUtil.getBorder(elm.parentNode, true);
				elm.dragCfg.cont.w = elm.dragCfg.cont.wb - contBorders.l - contBorders.r;
				elm.dragCfg.cont.h = elm.dragCfg.cont.hb - contBorders.t - contBorders.b;
			} else if (elm.dragCfg.containment == 'document') {
				clnt = jQuery.iUtil.getClient();
				elm.dragCfg.cont = {
					x : 0,
					y : 0,
					w : clnt.w,
					h : clnt.h
				};
			}
		} else if (elm.dragCfg.containment.constructor == Array) {
			elm.dragCfg.cont = {
				x : parseInt(elm.dragCfg.containment[0])||0,
				y : parseInt(elm.dragCfg.containment[1])||0,
				w : parseInt(elm.dragCfg.containment[2])||0,
				h : parseInt(elm.dragCfg.containment[3])||0
			};
		}
		elm.dragCfg.cont.dx = elm.dragCfg.cont.x - elm.dragCfg.oC.x;
		elm.dragCfg.cont.dy = elm.dragCfg.cont.y - elm.dragCfg.oC.y;
	},
	
	hidehelper : function(dragged)
	{
		if (dragged.dragCfg.insideParent || dragged.dragCfg.containment == 'parent') {
			jQuery('body', document).append(jQuery.iDrag.helper.get(0));
		}
		jQuery.iDrag.helper.empty().hide().css('opacity', 1);
		if (window.ActiveXObject) {
			jQuery.iDrag.helper.css('filter', 'alpha(opacity=100)');
		}
	},
	
	dragstop : function(e)
	{
		
		jQuery(document)
			.unbind('mousemove', jQuery.iDrag.dragmove)
			.unbind('mouseup', jQuery.iDrag.dragstop);
			
		if (jQuery.iDrag.dragged == null) {
			return;
		}
		dragged = jQuery.iDrag.dragged;
		
		jQuery.iDrag.dragged = null;

		if (dragged.dragCfg.init == false) {
			return false;	
		}
		if (dragged.dragCfg.so == true) {
			jQuery(dragged).css('position', dragged.dragCfg.oP);
		}
		dEs = dragged.style;
		
		if (dragged.si) {
			jQuery.iDrag.helper.css('cursor', 'move');
		}
		
		if (dragged.dragCfg.revert == false) {
			if (dragged.dragCfg.fx > 0) {
				if (!dragged.dragCfg.axis || dragged.dragCfg.axis == 'horizontally') {
					x = new jQuery.fx(dragged,dragged.dragCfg.fx, 'left');
					x.custom(dragged.dragCfg.oR.x,dragged.dragCfg.nRx);
				}
				if (!dragged.dragCfg.axis || dragged.dragCfg.axis == 'vertically') {
					y = new jQuery.fx(dragged,dragged.dragCfg.fx, 'top');
					y.custom(dragged.dragCfg.oR.y,dragged.dragCfg.nRy);
				}
			} else {
				if (!dragged.dragCfg.axis || dragged.dragCfg.axis == 'horizontally') 
					dragged.style.left = dragged.dragCfg.nRx + 'px';
				if (!dragged.dragCfg.axis || dragged.dragCfg.axis == 'vertically')
					dragged.style.top = dragged.dragCfg.nRy + 'px';
			}
			jQuery.iDrag.hidehelper(dragged);
			if (dragged.dragCfg.ghosting == false) {
				jQuery(dragged).css('display', dragged.dragCfg.oD);
			}
		} else if (dragged.dragCfg.fx > 0) {
			dragged.dragCfg.prot = true;
			if(jQuery.iDrop && jQuery.iDrop.overzone && jQuery.iSort) {
				dh = jQuery.iUtil.getPosition(jQuery.iSort.helper.get(0));
			} else {
				dh = false;
			}
			jQuery.iDrag.helper.animate(
				{
					left : dh ? dh.x : dragged.dragCfg.oC.x,
					top : dh ? dh.y : dragged.dragCfg.oC.y
				},
				dragged.dragCfg.fx,
				function()
				{
					dragged.dragCfg.prot = false;
					if (dragged.dragCfg.ghosting == false) {
						dragged.style.display = dragged.dragCfg.oD;
					}
					jQuery.iDrag.hidehelper(dragged);
				}
			);
		} else {
			jQuery.iDrag.hidehelper(dragged);
			if (dragged.dragCfg.ghosting == false) {
				jQuery(dragged).css('display', dragged.dragCfg.oD);
			}
		}

		if (jQuery.iDrop && jQuery.iDrop.count > 0 ){
			jQuery.iDrop.checkdrop(dragged);
		}
		if (jQuery.iSort && jQuery.iDrop.overzone) {
			jQuery.iSort.check(dragged);
		}
		if (dragged.dragCfg.onChange && (dragged.dragCfg.nRx != dragged.dragCfg.oR.x || dragged.dragCfg.nRy != dragged.dragCfg.oR.y)){
			dragged.dragCfg.onChange.apply(dragged, dragged.dragCfg.lastSi||[0,0,dragged.dragCfg.nRx,dragged.dragCfg.nRy]);
		}
		if (dragged.dragCfg.onStop)
			dragged.dragCfg.onStop.apply(dragged);
		return false;
	},
	
	snapToGrid : function(x, y, dx, dy)
	{
		if (dx != 0)
			dx = parseInt((dx + (this.dragCfg.gx * dx/Math.abs(dx))/2)/this.dragCfg.gx) * this.dragCfg.gx;
		if (dy != 0)
			dy = parseInt((dy + (this.dragCfg.gy * dy/Math.abs(dy))/2)/this.dragCfg.gy) * this.dragCfg.gy;
		return {
			dx : dx,
			dy : dy,
			x: 0,
			y: 0
		};
	},
	
	fitToContainer : function(x, y, dx, dy)
	{
		dx = Math.min(
				Math.max(dx,this.dragCfg.cont.dx),
				this.dragCfg.cont.w + this.dragCfg.cont.dx - this.dragCfg.oC.wb
			);
		dy = Math.min(
				Math.max(dy,this.dragCfg.cont.dy),
				this.dragCfg.cont.h + this.dragCfg.cont.dy - this.dragCfg.oC.hb
			);
		
		return {
			dx : dx,
			dy : dy,
			x: 0,
			y: 0
		}
	},
	
	dragmove : function(e)
	{
		if (jQuery.iDrag.dragged == null || jQuery.iDrag.dragged.dragCfg.prot == true) {
			return;
		}
		
		var dragged = jQuery.iDrag.dragged;
		
		dragged.dragCfg.currentPointer = jQuery.iUtil.getPointer(e);
		if (dragged.dragCfg.init == false) {
			distance = Math.sqrt(Math.pow(dragged.dragCfg.pointer.x - dragged.dragCfg.currentPointer.x, 2) + Math.pow(dragged.dragCfg.pointer.y - dragged.dragCfg.currentPointer.y, 2));
			if (distance < dragged.dragCfg.snapDistance){
				return;
			} else {
				jQuery.iDrag.dragstart(e);
			}
		}
		
		dx = dragged.dragCfg.currentPointer.x - dragged.dragCfg.pointer.x;
		dy = dragged.dragCfg.currentPointer.y - dragged.dragCfg.pointer.y;
		
		for (i in dragged.dragCfg.onDrag) {
			newCoords = dragged.dragCfg.onDrag[i].apply(dragged, [dragged.dragCfg.oR.x + dx, dragged.dragCfg.oR.y + dy, dx, dy]);
			if (newCoords && newCoords.constructor == Object) {
				dx = i != 'user' ? newCoords.dx : (newCoords.x - dragged.dragCfg.oR.x);
				dy = i != 'user' ? newCoords.dy : (newCoords.y - dragged.dragCfg.oR.y);
			}
		}
		
		dragged.dragCfg.nx = dragged.dragCfg.oC.x + dx - dragged.dragCfg.diffX;
		dragged.dragCfg.ny = dragged.dragCfg.oC.y + dy - dragged.dragCfg.diffY;
		
		if (dragged.dragCfg.si && (dragged.dragCfg.onSlide || dragged.dragCfg.onChange)) {
			jQuery.iSlider.onSlide(dragged, dragged.dragCfg.nx, dragged.dragCfg.ny);
		}
		
		if (!dragged.dragCfg.axis || dragged.dragCfg.axis == 'horizontally') {
			dragged.dragCfg.nRx = dragged.dragCfg.oR.x + dx;
			jQuery.iDrag.helper.get(0).style.left = dragged.dragCfg.nx + 'px';
		}
		if (!dragged.dragCfg.axis || dragged.dragCfg.axis == 'vertically') {
			dragged.dragCfg.nRy = dragged.dragCfg.oR.y + dy;
			jQuery.iDrag.helper.get(0).style.top = dragged.dragCfg.ny + 'px';
		}
			
		if (jQuery.iDrop && jQuery.iDrop.count > 0 ){
			jQuery.iDrop.checkhover(dragged, clonedEl);
		}
		return false;
	},
		
	build : function(o)
	{
			/*if (jQuery.browser.msie) {
				jQuery(window)
					.bind(
						'unload', 
						function()
						{
							jQuery('body')
								.unbind('mousemove', jQuery.iDrag.dragmove)
								.unbind('mouseup', jQuery.iDrag.dragstop);
							jQuery.iDrag.helper = null;
							jQuery.iDrag.dragged = null;
							jQuery('*').each(
								function()
								{
									if (this.dragElem) {
										jQuery(this).unbind('mousedown', jQuery.iDrag.dragstart);
										this.dragElem = null;
										this.onselectstart = null;
										this.ondragstart = null;
									}
								}
							);
						}
					);
			}*/
		if (!jQuery.iDrag.helper) {
			jQuery('body',document).append('<div id="dragHelper"></div>');
			jQuery.iDrag.helper = jQuery('#dragHelper');
			el = jQuery.iDrag.helper.get(0);
			els = el.style;
			els.position = 'absolute';
			els.display = 'none';
			els.cursor = 'move';
			els.listStyle = 'none';
			els.overflow = 'hidden';
			if (window.ActiveXObject) {
				el.onselectstart = function(){return false;};
				el.ondragstart = function(){return false;};
			} else {
				els.mozUserSelect = 'none';
				els.userSelect = 'none';
			}
		}
		if (!o) {
			o = {};
		}
		return this.each(
			function()
			{
				if (this.isDraggable || !jQuery.iUtil)
					return;
				if (window.ActiveXObject) {
					this.onselectstart = function(){return false;};
					this.ondragstart = function(){return false;};
				}
				var dhe = o.handle ? jQuery(this).find(o.handle) : jQuery(this);
				this.dragCfg = {
					revert : o.revert ? true : false,
					ghosting : o.ghosting ? true : false,
					so : o.so ? o.so : false,
					si : o.si ? o.si : false,
					insideParent : o.insideParent ? o.insideParent : false,
					zIndex : o.zIndex ? parseInt(o.zIndex)||0 : false,
					opacity : o.opacity ? parseFloat(o.opacity) : false,
					fx : parseInt(o.fx)||null,
					hpc : o.hpc ? o.hpc : false,
					onDrag : {},
					pointer : {},
					onStart : o.onStart && o.onStart.constructor == Function ? o.onStart : false,
					onStop : o.onStop && o.onStop.constructor == Function ? o.onStop : false,
					onChange : o.onChange && o.onChange.constructor == Function ? o.onChange : false,
					axis : /vertically|horizontally/.test(o.axis) ? o.axis : false,
					snapDistance : o.snapDistance ? parseInt(o.snapDistance)||0 : 0,
					cursorAt: o.cursorAt ? o.cursorAt : false,
					autoSize : o.autoSize ? true : false
				};
				if (o.onDrag && o.onDrag.constructor == Function)
					this.dragCfg.onDrag.user = o.onDrag;
				if (o.containment && ((o.containment.constructor == String && (o.containment == 'parent' || o.containment == 'document')) || (o.containment.constructor == Array && o.containment.length == 4) )) {
					this.dragCfg.containment = o.containment;
				}
				if(o.fractions) {
					this.dragCfg.fractions = o.fractions;
				}
				if(o.grid){
					if(typeof o.grid == 'number'){
						this.dragCfg.gx = parseInt(o.grid)||1;
						this.dragCfg.gy = parseInt(o.grid)||1;
					} else if (o.grid.length == 2) {
						this.dragCfg.gx = parseInt(o.grid[0])||1;
						this.dragCfg.gy = parseInt(o.grid[1])||1;
					}
				}
				if (o.onSlide && o.onSlide.constructor == Function) {
					this.dragCfg.onSlide = o.onSlide;
				}
				
				this.isDraggable = true;
				dhe.get(0).dragElem = this;
				dhe.bind('mousedown', jQuery.iDrag.draginit);
			}
		)
	}
};

jQuery.fn.extend(
	{
		DraggableDestroy : jQuery.iDrag.destroy,
		Draggable : jQuery.iDrag.build
	}
);