/**********************************************************
 Adapted from the sortable lists example by Tim Taylor
 http://tool-man.org/examples/sorting.html
 Modified by Tom Westcott : http://www.cyberdummy.co.uk 
 Modified by Anubhav Goyal: Added unique functionality
						  : Ability to delete on drag out
 **********************************************************/
isCopied = 0;
var dragContainer;
var dropContainer;
var dragCopyItem;

var DragDrop = {
	firstContainer : null,
	lastContainer : null,
        parent_id : null,
        parent_group : null,
	makeListContainer : function(list, group, copy) {
		// each container becomes a linked list node
		if (this.firstContainer == null) {
			this.firstContainer = this.lastContainer = list;
			list.previousContainer = null;
			list.nextContainer = null;
		} else {
			list.previousContainer = this.lastContainer;
			list.nextContainer = null;
			this.lastContainer.nextContainer = list;
			this.lastContainer = list;
		}
		
		// these functions are called when an item is draged over
		// a container or out of a container bounds.  onDragOut
		// is also called when the drag ends with an item having
		// been added to the container
		list.onDragOver = new Function();
		list.onDragOut = new Function();
        list.onDragDrop = new Function();
        list.group = group;
        
        // Added by AG
        list.copy = copy;
        
    	var items = list.getElementsByTagName( "li" );
    	
		for (var i = 0; i < items.length; i++) {
			DragDrop.makeItemDragable(items[i]);
		}
	},
        
        serData : function ( group, theid ) {
                var container = DragDrop.firstContainer;
				var j = 0;
                var string = "";
                
                while (container != null) {
                
                        if(theid != null && container.id != theid)
                        {
                          container = container.nextContainer;
                          continue;
                        }

                        if(group != null && container.group != group)
                        {
                          container = container.nextContainer;
                          continue;
                        }
                
                        j ++;
                        if(j > 1)
                        {
                          string += ":";
                        }
                        string += container.id;
                        
                        var items = container.getElementsByTagName( "li" );
    	                string += "(";
						for (var i = 0; i < items.length; i++) {
									if(i > 0)
									{
									string += ",";
									}
						string += items[i].id;
						}
								string += ")";
		                        
						container = container.nextContainer;
					}
					return string;   
        },

	makeItemDragable : function(item) {
		Drag.makeDraggable(item);
		item.setDragThreshold(5);
		
		// tracks if the item is currently outside all containers
		item.isOutside = false;
		
		item.onDragStart = DragDrop.onDragStart;
		item.onDrag = DragDrop.onDrag;
		item.onDragEnd = DragDrop.onDragEnd;
	},

	onDragStart : function(nwPosition, sePosition, nwOffset, seOffset) {
		// update all container bounds, since they may have changed
		// on a previous drag
		//
		// could be more smart about when to do this
		
		// Added by AG
		dragContainer = this.parentNode;
		
		var container = DragDrop.firstContainer;
		while (container != null) {
			container.northwest = Coordinates.northwestOffset( container, true );
			container.southeast = Coordinates.southeastOffset( container, true );
			container = container.nextContainer;
		}
		
		// item starts out over current parent
		this.parentNode.onDragOver();
                parent_id = this.parentNode.id;
                parent_group = this.parentNode.group;
	},

	onDrag : function(nwPosition, sePosition, nwOffset, seOffset) {
		// check if we were nowhere
		if (this.isOutside) {
			// check each container to see if in its bounds
			var container = DragDrop.firstContainer;
			while (container != null) {

				if ((nwOffset.inside( container.northwest, container.southeast ) ||
					seOffset.inside( container.northwest, container.southeast )) && container.group == parent_group) {
					// we're inside this one
					container.onDragOver();
					this.isOutside = false;
					
					// since isOutside was true, the current parent is a
					// temporary clone of some previous container node and
					// it needs to be removed from the document
					var tempParent = this.parentNode;
					tempParent.removeChild( this );
					container.appendChild( this );
					tempParent.parentNode.removeChild( tempParent );
					break;
				}
				container = container.nextContainer;
			}
			// we're still not inside the bounds of any container
			if (this.isOutside)
				return;
		
		// check if we're outside our parent's bounds
		} else if (!(nwOffset.inside( this.parentNode.northwest, this.parentNode.southeast ) ||
			seOffset.inside( this.parentNode.northwest, this.parentNode.southeast ))) {
			
			this.parentNode.onDragOut();
			this.isOutside = true;
			
			// check if we're inside a new container's bounds
			var container = DragDrop.firstContainer;
			while (container != null) {
				if ((nwOffset.inside( container.northwest, container.southeast ) ||
					seOffset.inside( container.northwest, container.southeast )) && container.group == parent_group) {
					// we're inside this one
					container.onDragOver();
					this.isOutside = false;
					this.parentNode.removeChild( this );
					container.appendChild( this );
					break;
				}
				container = container.nextContainer;
			}
			// if we're not in any container now, make a temporary clone of
			// the previous container node and add it to the document
			if (this.isOutside) {
				var tempParent = this.parentNode.cloneNode( false );
				this.parentNode.removeChild( this );
				tempParent.appendChild( this );
				// body puts a border or item at bottom of page if do not have this
                                tempParent.style.border = 0;
				document.getElementsByTagName( "body" ).item(0).appendChild( tempParent );
				return;
			}
		}
		else
		{			
			if(isCopied==0 &&this.parentNode.copy==1)
			{
				dragCopyItem = document.createElement("li"); 
				dragCopyItem.innerHTML = this.innerHTML;
				dragCopyItem.style["top"] = "0px";
				dragCopyItem.style["left"] = "0px";
				DragDrop.makeItemDragable(dragCopyItem);
				this.parentNode.insertBefore(dragCopyItem,this);
			}
			isCopied = 1
			
		}
		
		// if we get here, we're inside some container bounds, so we do
		// everything the original dragsort script did to swap us into the
		// correct position
		
		var parent = this.parentNode;
				
		var item = this;
		var next = DragUtils.nextItem(item);
		while (next != null && this.offsetTop >= next.offsetTop - 2) {
			var item = next;
			var next = DragUtils.nextItem(item);
		}
		if (this != item) {
			DragUtils.swap(this, next);
			return;
		}

		var item = this;
		var previous = DragUtils.previousItem(item);
		while (previous != null && this.offsetTop <= previous.offsetTop + 2) {
			var item = previous;
			var previous = DragUtils.previousItem(item);
		}
		if (this != item) {
			DragUtils.swap(this, item);
			return;
		}
	},

	onDragEnd : function(nwPosition, sePosition, nwOffset, seOffset) {
		// if the drag ends and we're still outside all containers
		// it's time to remove ourselves from the document or add 
        // to the trash bin
        
        // Added by AG
        dropContainer = this.parentNode;       
        isCopied = 0;
		var listType = dropContainer.id;
		var accessID;
		if (listType.indexOf('VL') != -1)
			accessID = 1;
		else if (listType.indexOf('EL') != -1)
			accessID = 2;
		        
		if (this.isOutside) {
                        var container = DragDrop.firstContainer;
                        while (container != null) {
                           if(container.id == parent_id)
                           {
                             break;
                           }
                           container = container.nextContainer;
                        }
			this.isOutside = false;
			this.parentNode.removeChild( this );
			this.style["top"] = "0px";
		    this.style["left"] = "0px";
		    // Added by AG: implementing normal delete
		    if (dragContainer.copy == 0)
		    {
					
			}
			return;
		} 
		
		// Added by AG
		else 
		{
			if(dragContainer.id == dropContainer.id)
			{
				if(dragCopyItem != null)
				{
					dragContainer.removeChild(dragCopyItem);
				}	
				else
				{
					
				}		
			}
			if(dragContainer.copy == 0 && dragContainer.id != dropContainer.id)
			{
				this.parentNode.removeChild( this );
				return;
			}
			// Avoid adding duplicates ... No changes in the database required
			if(dragContainer.id != dropContainer.id)
			{
				var allText = getObjInnerText(dropContainer);
				var text = getObjInnerText(this);
				var index = allText.indexOf(text,allText.indexOf(text)+1);
				if(index != -1)
				{
					this.parentNode.removeChild( this );
					return;
				} 
			}
		}
			
		if (dragContainer.copy != 0 && dragContainer.id != dropContainer.id)
		{
			
		}
		dragCopyItem = null;
		if (this.parentNode.tagName == "UL")
		{ 
			this.parentNode.onDragOut();
			this.parentNode.onDragDrop();
      	}
      	this.style["top"] = "0px";
		this.style["left"] = "0px";
	}
};

var DragUtils = {
	swap : function(item1, item2) {
		var parent = item1.parentNode;
		parent.removeChild(item1);
		parent.insertBefore(item1, item2);

		item1.style["top"] = "0px";
		item1.style["left"] = "0px";
	},

	nextItem : function(item) {
		var sibling = item.nextSibling;
		while (sibling != null) {
			if (sibling.nodeName == item.nodeName) return sibling;
			sibling = sibling.nextSibling;
		}
		return null;
	},

	previousItem : function(item) {
		var sibling = item.previousSibling;
		while (sibling != null) {
			if (sibling.nodeName == item.nodeName) return sibling;
			sibling = sibling.previousSibling;
		}
		return null;
	}		
};

function getObjInnerText(obj){
  if (window.navigator.appName.toLowerCase().indexOf("microsoft") > -1) {
    // IE;
    return obj.innerText;
  }
  else{
    if (window.navigator.appName.toLowerCase().indexOf("netscape") > -1)
    {
      // Firefox
      return obj.textContent;
    }
    else
      alert("Error: This application does not support your browser.  Try using IE or Firefox.");
  }
}