/************************************************************************************************************
	(C) www.dhtmlgoodies.com, December 2005
	
	This is a script from www.dhtmlgoodies.com. You will find this and a lot of other scripts at our website.	
	
	Terms of use:
	You are free to use this script as long as the copyright message is kept intact. However, you may not
	redistribute, sell or repost it without our permission.
	
	Thank you!
	
	www.dhtmlgoodies.com
	Alf Magne Kalleland
	
	************************************************************************************************************/
		
	/* VARIABLES YOU COULD MODIFY */
	var boxSizeArray = [5,5,5,5,5,5,5];	// Array indicating how many items there is rooom for in the right column ULs
	
	var arrow_offsetX = -5;	// Offset X - position of small arrow
	var arrow_offsetY = 0;	// Offset Y - position of small arrow
	
	var arrow_offsetX_firefox = -6;	// Firefox - offset X small arrow
	var arrow_offsetY_firefox = -13; // Firefox - offset Y small arrow
	
	var verticalSpaceBetweenListItems = 3;	// Pixels space between one <li> and next	
											// Same value or higher as margin bottom in CSS for #dhtmlgoodies_dragDropContainer ul li,#dragContent li
	
											
	var initShuffleItems = true;	// Shuffle items before staring

	var indicateDestionationByUseOfArrow = false;	// Display arrow to indicate where object will be dropped(false = use rectangle)
	
	var lockedAfterDrag = false;	/* Lock items after they have been dragged, i.e. the user get's only one shot for the correct answer */
	
	
	/* END VARIABLES YOU COULD MODIFY */
	
	var dragDropTopContainer = false;
	var dragTimer = -1;
	var dragContentObj = false;
	var contentToBeDragged = false;	// Reference to dragged <li>
	var contentToBeDragged_src = false;	// Reference to parent of <li> before drag started
	var contentToBeDragged_next = false; 	// Reference to next sibling of <li> to be dragged
	var destinationObj = false;	// Reference to <UL> or <LI> where element is dropped.
	var dragDropIndicator = false;	// Reference to small arrow indicating where items will be dropped
	var ulPositionArray = new Array();
	var mouseoverObj = false;	// Reference to highlighted DIV
	
	var MSIE = navigator.userAgent.indexOf('MSIE')>=0?true:false;
	var navigatorVersion = navigator.appVersion.replace(/.*?MSIE (\d\.\d).*/g,'$1')/1;
	var destinationBoxes = new Array();
	var indicateDestinationBox = false;
	
	function display(element) {
    if (document.layers && document.layers[element] != null)
        document.layers[element].display = 'block';
    else if (document.all)
        document.all[element].style.display = 'block';
	}
		
	function getTopPos(inputObj)
	{		
	  var returnValue = inputObj.offsetTop;
	  while((inputObj = inputObj.offsetParent) != null){
	  	if(inputObj.tagName!='HTML')returnValue += inputObj.offsetTop;
	  }
	  return returnValue;
	}
	
	function getLeftPos(inputObj)
	{
	  var returnValue = inputObj.offsetLeft;
	  while((inputObj = inputObj.offsetParent) != null){
	  	if(inputObj.tagName!='HTML')returnValue += inputObj.offsetLeft;
	  }
	  return returnValue;
	}
		
	function cancelEvent()
	{
		return false;
	}
	function initDrag(e)	// Mouse button is pressed down on a LI
	{
		if(document.all)e = event;
		if(lockedAfterDrag && this.parentNode.id!='allItems')return;
		
		var st = Math.max(document.body.scrollTop,document.documentElement.scrollTop);
		var sl = Math.max(document.body.scrollLeft,document.documentElement.scrollLeft);
		
		dragTimer = 0;
		dragContentObj.style.left = e.clientX + sl + 'px';
		dragContentObj.style.top = e.clientY + st + 'px';
		contentToBeDragged = this;
		contentToBeDragged_src = this.parentNode;
		contentToBeDragged_next = false;
		if(this.nextSibling){
			contentToBeDragged_next = this.nextSibling;
			if(!this.tagName && contentToBeDragged_next.nextSibling)contentToBeDragged_next = contentToBeDragged_next.nextSibling;
		}
		timerDrag();
		return false;
	}
	
	function everythingIsCorrect()
	{
		alert('Great! Each word is in the appropriate box!');		
	}
	
	
	function timerDrag()
	{
		if(dragTimer>=0 && dragTimer<10){
			dragTimer++;
			setTimeout('timerDrag()',10);
			return;
		}
		if(dragTimer==10){
			dragContentObj.style.display='block';
			dragContentObj.appendChild(contentToBeDragged);
		}
	}
	
	function moveDragContent(e)
	{
		if(dragTimer<10){
			if(contentToBeDragged){
				if(contentToBeDragged_next){
					contentToBeDragged_src.insertBefore(contentToBeDragged,contentToBeDragged_next);
				}else{
					contentToBeDragged_src.appendChild(contentToBeDragged);
				}	
			}
			return;
		}
		if(document.all)e = event;
		var st = Math.max(document.body.scrollTop,document.documentElement.scrollTop);
		var sl = Math.max(document.body.scrollLeft,document.documentElement.scrollLeft);
		
		
		dragContentObj.style.left = e.clientX + sl + 'px';
		dragContentObj.style.top = e.clientY + st + 'px';
		
		if(mouseoverObj)mouseoverObj.className='';
		destinationObj = false;
		dragDropIndicator.style.display='none';
		if(indicateDestinationBox)indicateDestinationBox.style.display='none';
		var x = e.clientX + sl;
		var y = e.clientY + st;
		var width = dragContentObj.offsetWidth;
		var height = dragContentObj.offsetHeight;
		
		var tmpOffsetX = arrow_offsetX;
		var tmpOffsetY = arrow_offsetY;
		if(!document.all){
			tmpOffsetX = arrow_offsetX_firefox;
			tmpOffsetY = arrow_offsetY_firefox;
		}

		for(var no=0;no<ulPositionArray.length;no++){
			var ul_leftPos = ulPositionArray[no]['left'];	
			var ul_topPos = ulPositionArray[no]['top'];	
			var ul_height = ulPositionArray[no]['height'];
			var ul_width = ulPositionArray[no]['width'];
			
			if((x+width) > ul_leftPos && x<(ul_leftPos + ul_width) && (y+height)> ul_topPos && y<(ul_topPos + ul_height)){
				var noExisting = ulPositionArray[no]['obj'].getElementsByTagName('LI').length;
				if(indicateDestinationBox && indicateDestinationBox.parentNode==ulPositionArray[no]['obj'])noExisting--;
				if(noExisting<boxSizeArray[no-1] || no==0){
					dragDropIndicator.style.left = ul_leftPos + tmpOffsetX + 'px';
					var subLi = ulPositionArray[no]['obj'].getElementsByTagName('LI');
					for(var liIndex=0;liIndex<subLi.length;liIndex++){
						var tmpTop = getTopPos(subLi[liIndex]);
						if(!indicateDestionationByUseOfArrow){
							if(y<tmpTop){
								destinationObj = subLi[liIndex];
								indicateDestinationBox.style.display='block';
								subLi[liIndex].parentNode.insertBefore(indicateDestinationBox,subLi[liIndex]);
								break;
							}
						}else{							
							if(y<tmpTop){
								destinationObj = subLi[liIndex];
								dragDropIndicator.style.top = tmpTop + tmpOffsetY - Math.round(dragDropIndicator.clientHeight/2) + 'px';
								dragDropIndicator.style.display='block';
								break;
							}	
						}					
					}
					
					if(!indicateDestionationByUseOfArrow){
						if(indicateDestinationBox.style.display=='none'){
							indicateDestinationBox.style.display='block';
							ulPositionArray[no]['obj'].appendChild(indicateDestinationBox);
						}
						
					}else{
						if(subLi.length>0 && dragDropIndicator.style.display=='none'){
							dragDropIndicator.style.top = getTopPos(subLi[subLi.length-1]) + subLi[subLi.length-1].offsetHeight + tmpOffsetY + 'px';
							dragDropIndicator.style.display='block';
						}
						if(subLi.length==0){
							dragDropIndicator.style.top = ul_topPos + arrow_offsetY + 'px'
							dragDropIndicator.style.display='block';
						}
					}
					
					if(!destinationObj)destinationObj = ulPositionArray[no]['obj'];
					mouseoverObj = ulPositionArray[no]['obj'].parentNode;
					mouseoverObj.className='mouseover';
					return;
				}
			}
		}
	}
	
	function checkAnswers()
	{
		
		for(var no=0;no<destinationBoxes.length;no++){
			var subLis = destinationBoxes[no].getElementsByTagName('LI');
			if(subLis.length<boxSizeArray[no])return;	
			
			for(var no2=0;no2<subLis.length;no2++){
				if(subLis[no2].className=='wrongAnswer')return;
			}		
		}
		
		everythingIsCorrect();
		
		
	}
	
	
	/* End dragging 
	Put <LI> into a destination or back to where it came from.
	*/	
	function dragDropEnd(e)
	{
		if(dragTimer==-1)return;
		if(dragTimer<10){
			dragTimer = -1;
			return;
		}
		dragTimer = -1;
		if(document.all)e = event;		
		if(destinationObj){
			var groupId = contentToBeDragged.getAttribute('groupId');
			if(!groupId)groupId = contentToBeDragged.groupId;
			
			var destinationToCheckOn = destinationObj;
			if(destinationObj.tagName!='UL'){
				destinationToCheckOn = destinationObj.parentNode;
			}
			
			var answerCheck = false;
			if(groupId == destinationToCheckOn.id){
				contentToBeDragged.className = 'correctAnswer';		
				answerCheck=true;	
			}else{
				contentToBeDragged.className = 'wrongAnswer';
			}
			if(destinationObj.id=='allItems' || destinationObj.parentNode.id=='allItems')contentToBeDragged.className='';
			
			
			if(destinationObj.tagName=='UL'){
				destinationObj.appendChild(contentToBeDragged);
			}else{
				destinationObj.parentNode.insertBefore(contentToBeDragged,destinationObj);
			}
			mouseoverObj.className='';
			destinationObj = false;
			dragDropIndicator.style.display='none';
			if(indicateDestinationBox){
				indicateDestinationBox.style.display='none';
				document.body.appendChild(indicateDestinationBox);
			}
						
			contentToBeDragged = false;
			
			if(answerCheck)checkAnswers();	
			
			return;
		}	
		if(contentToBeDragged_next){
			contentToBeDragged_src.insertBefore(contentToBeDragged,contentToBeDragged_next);
		}else{
			contentToBeDragged_src.appendChild(contentToBeDragged);
		}
		contentToBeDragged = false;
		dragDropIndicator.style.display='none';
		if(indicateDestinationBox){
			indicateDestinationBox.style.display='none';
			document.body.appendChild(indicateDestinationBox);
			
		}		
		mouseoverObj = false;
		
	}
	
	/* 
	Preparing data to be saved 
	*/
	function saveDragDropNodes()
	{
		var saveString = "";
		var uls = dragDropTopContainer.getElementsByTagName('UL');
		for(var no=0;no<uls.length;no++){	// LOoping through all <ul>
			var lis = uls[no].getElementsByTagName('LI');
			for(var no2=0;no2<lis.length;no2++){
				if(saveString.length>0)saveString = saveString + ";";
				saveString = saveString + uls[no].id + '|' + lis[no2].id;
			}	
		}		
		
		document.getElementById('saveContent').innerHTML = '<h1>Ready to save these nodes:</h1> ' + saveString.replace(/;/g,';<br>') + '<p>Format: ID of ul |(pipe) ID of li;(semicolon)</p><p>You can put these values into a hidden form fields, post it to the server and explode the submitted value there</p>';
		
	}
	
	function initDragDropScript()
	{
		dragContentObj = document.getElementById('dragContent');
		dragDropIndicator = document.getElementById('dragDropIndicator');
		dragDropTopContainer = document.getElementById('dhtmlgoodies_dragDropContainer');
		document.documentElement.onselectstart = cancelEvent;;
		var listItems = dragDropTopContainer.getElementsByTagName('LI');	// Get array containing all <LI>
		var itemHeight = false;
		for(var no=0;no<listItems.length;no++){
			listItems[no].onmousedown = initDrag;
			listItems[no].onselectstart = cancelEvent;
			if(!itemHeight)itemHeight = listItems[no].offsetHeight;
			if(MSIE && navigatorVersion/1<6){
				listItems[no].style.cursor='hand';
			}			
		}
		
		var mainContainer = document.getElementById('dhtmlgoodies_mainContainer');
		var uls = mainContainer.getElementsByTagName('UL');
		itemHeight = itemHeight + verticalSpaceBetweenListItems;
		for(var no=0;no<uls.length;no++){
			uls[no].style.height = itemHeight * boxSizeArray[no]  + 'px';
			destinationBoxes[destinationBoxes.length] = uls[no];
		}
		
		var leftContainer = document.getElementById('dhtmlgoodies_listOfItems');
		var itemBox = leftContainer.getElementsByTagName('UL')[0];
		
		document.documentElement.onmousemove = moveDragContent;	// Mouse move event - moving draggable div
		document.documentElement.onmouseup = dragDropEnd;	// Mouse move event - moving draggable div
		
		var ulArray = dragDropTopContainer.getElementsByTagName('UL');
		for(var no=0;no<ulArray.length;no++){
			ulPositionArray[no] = new Array();
			ulPositionArray[no]['left'] = getLeftPos(ulArray[no]);	
			ulPositionArray[no]['top'] = getTopPos(ulArray[no]);	
			ulPositionArray[no]['width'] = ulArray[no].offsetWidth;
			ulPositionArray[no]['height'] = ulArray[no].clientHeight;
			ulPositionArray[no]['obj'] = ulArray[no];
		}
		
		if(initShuffleItems){
			var allItemsObj = document.getElementById('allItems');
			var initItems = allItemsObj.getElementsByTagName('LI');
			
			for(var no=0;no<(initItems.length*10);no++){
				var itemIndex = Math.floor(Math.random()*initItems.length);
				allItemsObj.appendChild(initItems[itemIndex]);
			}
		}
		if(!indicateDestionationByUseOfArrow){
			indicateDestinationBox = document.createElement('LI');
			indicateDestinationBox.id = 'indicateDestination';
			indicateDestinationBox.style.display='none';
			document.body.appendChild(indicateDestinationBox);
		}		
		
	}
	
	window.onload = initDragDropScript;