// (c) Benoît PIN 2006-2007
// http://plinn.org
// Licence GPL
// $Id: folder_contents_script.js 1374 2008-09-12 11:58:34Z pin $
// $URL: http://svn.cri.ensmp.fr/svn/Plinn/trunk/skins/ajax_scripts/folder_contents_script.js $

function getTargetRow(evt){
	var target = getTargetedObject(evt);
	while (target.nodeName != "TR")
		target = target.parentNode;
	return target;
}

function FolderDDropControler(listing) {
	this.folderUrl = document.getElementById("FolderUrl").innerHTML;
	this.targetRow = null;
	this.lastOverPosition = null;
	this.prevDirUp = null;
	this.noOver = true;
	this.listing = listing;
	var thisControler = this;
	this.listing.onmousedown	= function(evt) {thisControler.drag(evt);};
	this.listing.onmouseover	= function(evt) {thisControler.moveRow(evt);};
	this.listing.onmouseup		= function(evt) {thisControler.drop(evt);};
	this.listing.onclick		= function(evt) {thisControler.disableClickAfterDrop(evt);};
	
	if (browser.isIE) {
		this.listing.ondragstart = function() { window.event.returnValue = false;};
	}
}

FolderDDropControler.prototype.drag =  function(evt){
	var target = getTargetedObject(evt);
	if (target.nodeName == "INPUT") return true;
	disableDefault(evt);
	var targetRow = getTargetRow(evt);
	targetRow.style.backgroundColor = base_properties["highLightColor"];
	this.listing.style.cursor = "move";
	this.targetRow = targetRow;
	this.lastOverPosition = targetRow.pos;
};

FolderDDropControler.prototype.moveRow =  function(evt){
	var targetRow = this.targetRow;
	if (targetRow != null) {
		this.noOver = false;
		if (browser.isIE) document.selection.clear();
		var overRow = getTargetRow(evt);

	 	if (overRow.pos == targetRow.pos) return;
 	
		if (this.lastOverPosition < overRow.pos) { // move up
			this.listing.insertBefore(targetRow, overRow.nextSibling);
			this.prevDirUp = true;
			this.lastOverPosition = overRow.pos;
		}
		else if (this.lastOverPosition > overRow.pos) { // move down
			this.listing.insertBefore(targetRow, overRow);
			this.prevDirUp = false;
			this.lastOverPosition = overRow.pos;
		}
		else {
			if (this.prevDirUp) {
				this.prevDirUp = false;
				this.listing.insertBefore(targetRow, overRow);
			}
			else {
				this.prevDirUp = true;
				this.listing.insertBefore(targetRow, overRow.nextSibling);
			}
		}
	}
};

FolderDDropControler.prototype.drop =  function(evt){
	var targetRow = this.targetRow;
	if (targetRow != null) {
		targetRow.style.backgroundColor="";
		this.listing.style.cursor = "";
		if (this.noOver) {
			var thisControler = this;
			setTimeout(function(){thisControler.reset();}, 50);
			return;
		}
		if (this.lastOverPosition != null) {
			// get new object position.
			var trim = 0;
			if (targetRow.pos < this.lastOverPosition && !this.prevDirUp)
				trim = -1;
			else if (targetRow.pos > this.lastOverPosition && this.prevDirUp)
				trim = 1;
		
			// construct url
	  		var object_id = targetRow.getElementsByTagName("INPUT")[0].getAttribute("value");
	  		var url = this.folderUrl + "/moveObjectIdToPosition";
	  		var form ="object_id=" + object_id + "&position:int=" +
	  				   String(this.lastOverPosition - 1 + trim);

			// reinitialize positions
			var rows = this.listing.getElementsByTagName("TR"), row;
			for (var i = 0 ; i < rows.length ; i++) {
				row = rows[i];
				row.pos = i+1;
	  			if (i % 2 == 0)
	  				row.className = "even";
	  			else
	  				row.className = "odd";
	  		}

			// send request	    		
			var req = new XMLHttpRequest();
			req.open("POST", url, true);
			req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded;charset=utf-8");
			req.send(form);
			var thisControler = this;
			setTimeout(function(){thisControler.reset();}, 50);
		}
	}
};

FolderDDropControler.prototype.disableClickAfterDrop = function(evt) {
	var target = getTargetedObject(evt);
	if (!this.noOver) {
		disablePropagation(evt);
		disableDefault(evt);
	}
	this.reset();
};

FolderDDropControler.prototype.reset = function() {
	this.targetRow = null;
	this.lastOverPosition = null;
	this.prevDirUp = null;
	this.noOver = true;
}



function DropTarget(node, folderDDControler) {
	this.folderDDControler = folderDDControler;
	this.batchSize = parseInt(document.getElementById("BatchNavigationSize").innerHTML);
	var thisControler = this;
	node.onmouseup = function(evt){thisControler.drop(evt);};
	node.onmouseover = function(evt) {thisControler.highlightTarget(evt);};
	node.onmouseout = function(evt) {
		var target = getTargetedObject(evt);
		if (target.nodeName == "A" && target.className == "dropPageTarget")
			target.className = "";
	};
}

DropTarget.prototype.drop = function(evt) {
	var target = getTargetedObject(evt);
	if (target.nodeName == "A" &&
		target.className != "previous" && 
		target.className != "next") {
		var pageNumber = parseInt(target.innerHTML);
		var targetRow = this.folderDDControler.targetRow;
		if ( !isNaN(pageNumber) && targetRow) {
			this.folderDDControler.reset();
    		var object_id = targetRow.getElementsByTagName("INPUT")[0].getAttribute("value");
    		var url = this.folderDDControler.folderUrl + "/moveObjectIdToPosition";
    		var form ="object_id=" + object_id + "&position:int=" + String(this.batchSize * (pageNumber-1));
			// send request
			var req = new XMLHttpRequest();
			req.open("POST", url, true);
			req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded;charset=utf-8");
			req.send(form);
			req.onreadystatechange = function() {
				if (req.readyState == 4) {
					switch (req.status) {
						case 200:
						case 204:
						case 1223:
							raiseMouseEvent(target, "click");
							break;
						default:
							alert('Error: ' + req.status);
					};
				}
			};
		}
	}
};

DropTarget.prototype.highlightTarget = function(evt){
	if (browser.isIE) document.selection.clear();
	var target = getTargetedObject(evt);
	if (this.folderDDControler.targetRow &&
		target.nodeName == "A" &&
		target.className != "previous" &&
		target.className != "next")
		target.className = "dropPageTarget";
};




function loadListing(evt) {
	var target = getTargetedObject(evt);
	disableDefault(evt);
	disablePropagation(evt);
	switch (target.nodeName) {
		case "A" :
			var parts = target.href.split('?')
			var url = parts[0];
			var query = '';
			if (parts.length == 2)
				query = parts[1];
			
			var urlParts = url.split("/");
			var url = urlParts.slice(0,urlParts.length-1).join("/");
			if (query.search("template") == -1)
				query += "&template=folder_contents_macros&macro=FolderListing&fragmentId=FolderListing";
			url = url + "/folder_contents?" + query;
			
			var fi = new FragmentImporter(url);
			fi.load();
			break;

		case "IMG" :
			if (target.id == 'SetSortingAsDefault') {
				var parent = target.parentNode;
				var url = parent.href;
				url = url.replace("folder_contents", "folder_sort_control");
				parent.parentNode.removeChild(parent);
				
				var req = new XMLHttpRequest();
				req.open("GET", url, true);
				req.send(null);
			}
			break;
	}
	return false;
}