// ===================================================================
// Author: Denis Howlett <feedback@isocra.com>
// 
//
// NOTICE: You may use this code for any purpose, commercial or
// private, without any further permission from the author. You may
// remove this notice from your final code if you wish, however we
// would appreciate it if at least the web site address is kept.
//
// You may *NOT* re-distribute this code in any way except through its
// use. That means, you can include it in your product, or your web
// site, or any other form where the code is actually being used. You
// may not put the plain javascript up on your site for download or
// include it in your javascript libraries for download.
// If you wish to share this code with others, please just point them
// to the URL instead.
//
// Please DO NOT link directly to this .js files from your site. Copy
// the files to your server and use them there. Thank you.
// ===================================================================

/** Keep hold of the current table being dragged */
var currenttable = null;

/** Capture the onmousemove so that we can see if a row from the current
 *  table if any is being dragged.
 * @param ev the event (for Firefox and Safari, otherwise we use window.event for IE)
 */
document.onmousemove = function(eve){
    if (currenttable && currenttable.dragObject) {
        eve   = eve || window.event;
        var mousePos = currenttable.mouseCoords(eve);
        var y = mousePos.y - currenttable.mouseOffset.y;
        if (y != currenttable.oldY) {
            // work out if we're going up or down...
            var movingDown = y > currenttable.oldY;
            // update the old value
            currenttable.oldY = y;
            // update the style to show we're dragging
            currenttable.dragObject.style.backgroundColor = "#eee";
            // If we're over a row then move the dragged row to there so that the user sees the
            // effect dynamically
            var currentRow = currenttable.findDropTargetRow(y);
            if (currentRow) {
                if (movingDown && currenttable.dragObject != currentRow) {
                    currenttable.dragObject.parentNode.insertBefore(currenttable.dragObject, currentRow.nextSibling);
                } else if (! movingDown && currenttable.dragObject != currentRow) {
                    currenttable.dragObject.parentNode.insertBefore(currenttable.dragObject, currentRow);
                }
            }
        }

        return false;
    }
}

// Similarly for the mouseup
document.onmouseup   = function(eve){
    if (currenttable && currenttable.dragObject) {
        var droppedRow = currenttable.dragObject;
        // If we have a dragObject, then we need to release it,
        // The row will already have been moved to the right place so we just reset stuff
        droppedRow.style.backgroundColor = 'transparent';
        currenttable.dragObject   = null;
        // And then call the onDrop method in case anyone wants to do any post processing
        currenttable.onDrop(currenttable.table, droppedRow);
        currenttable = null; // let go of the table too
    }
}


/** get the source element from an event in a way that works for IE and Firefox and Safari
 * @param evt the source event for Firefox (but not IE--IE uses window.event) */
function getEventSource(evt) {
    if (window.event) {
        evt = window.event; // For IE
        return evt.srcElement;
    } else {
        return evt.target; // For Firefox
    }
}

/**
 * Encapsulate table Drag and Drop in a class. We'll have this as a Singleton
 * so we don't get scoping problems.
 */
function TableDnD() {
    /** Keep hold of the current drag object if any */
    this.dragObject = null;
    /** The current mouse offset */
    this.mouseOffset = null;
    /** The current table */
    this.table = null;
    /** Remember the old value of Y so that we don't do too much processing */
    this.oldY = 0;
    
    this.oldIndex = 1;

    /** Initialise the drag and drop by capturing mouse move events */
    this.init = function(table) {
        this.table = table;
        var rows = table.tBodies[0].rows; //getElementsByTagName("tr")
        for (var i=0; i<rows.length; i++) {
			// John Tarr: added to ignore rows that I've added the NoDnD attribute to (Category and Header rows)
			var nodrag = rows[i].getAttribute("NoDrag")
			if (nodrag == null || nodrag == "undefined") { //There is no NoDnD attribute on rows I want to drag
				this.makeDraggable(rows[i]);
			}
        }
    }

    /** This function is called when you drop a row, so redefine it in your code
        to do whatever you want, for example use Ajax to update the server */
    this.onDrop = function(table, droppedRow) {
        var rows = this.table.tBodies[0].rows;
        var index = 0;
        for (; index<rows.length && rows[index].id != droppedRow.id; index++);
        index++;
        
        //alert("Déplacement de la chaine ID=" + droppedRow.id + "\nDe l 'index " +  this.oldIndex + "\n A l'index " + index);
        if (this.oldIndex != index) {
        
           // alert("COOKIES : \n " + document.cookie);
            // recupération des valeurs des cookie criptés
            // EMAIL
            deb = document.cookie.indexOf("; email=");
            emailCrypted = '';
            if (deb >= 0) {
                deb += '; email='.length;
                fin = document.cookie.indexOf(";",deb);
                if (fin < 0) {
                    fin = document.cookie.length ;
                }
                
                emailCrypted = unescape(document.cookie.substring(deb,fin));
            }
            // ID
            deb = document.cookie.indexOf("; id=");
            idCrypted = '';
            if (deb >= 0) {
                deb += '; id='.length;
                fin = document.cookie.indexOf(";",deb);
                if (fin < 0) {
                    fin = document.cookie.length ;
                }
                idCrypted = unescape(document.cookie.substring(deb,fin));
            }
            
           // alert("Id crypted = " + idCrypted + "\nMail crypted = " + emailCrypted);
             
            if (idCrypted.length > 0 && emailCrypted.length > 0) {
                
                var request;
                try {
                    request = new ActiveXObject("Microsoft.XMLHTTP");
                } catch(e) {
                    request = new XMLHttpRequest();
                }   
                
                url = '/identification/ChaineManager.jws?method=WS_setChaineIndex&chaineId=' + droppedRow.id + '&index=' + index + '&emailCrypted=' + encodeForUrl(emailCrypted) + '&idUserCrypted=' + encodeForUrl(idCrypted);
                //url = '/identification/ChaineManager.jsp?method=WS_setChaineIndex&chaineId=' + droppedRow.id + '&index=' + index + '&emailCrypted=' + encodeForUrl(emailCrypted) + '&idUserCrypted=' + encodeForUrl(idCrypted);
                // alert(url);
                request.open("GET", url, false);   
                request.send(null);
            }
        } else {
            //alert("Même index, pas de DnD");
        }
    }

	/** Get the position of an element by going up the DOM tree and adding up all the offsets */
    this.getPosition = function(e){
        var left = 0;
        var top  = 0;
		/** Safari fix -- thanks to Luis Chato for this! */
		if (e.offsetHeight == 0) {
			/** Safari 2 doesn't correctly grab the offsetTop of a table row
			    this is detailed here:
			    http://jacob.peargrove.com/blog/2006/technical/table-row-offsettop-bug-in-safari/
			    the solution is likewise noted there, grab the offset of a table cell in the row - the firstChild.
			    note that firefox will return a text node as a first child, so designing a more thorough
			    solution may need to take that into account, for now this seems to work in firefox, safari, ie */
			e = e.firstChild; // a table cell
		}

        while (e.offsetParent){
            left += e.offsetLeft;
            top  += e.offsetTop;
            e     = e.offsetParent;
        }

        left += e.offsetLeft;
        top  += e.offsetTop;

        return {x:left, y:top};
    }

	/** Get the mouse coordinates from the event (allowing for browser differences) */
    this.mouseCoords = function(eve){
        if(eve.pageX || eve.pageY){
            return {x:eve.pageX, y:eve.pageY};
        }
        return {
            x:eve.clientX + document.body.scrollLeft - document.body.clientLeft,
            y:eve.clientY + document.body.scrollTop  - document.body.clientTop
        };
    }

	/** Given a target element and a mouse event, get the mouse offset from that element.
		To do this we need the element's position and the mouse position */
    this.getMouseOffset = function(target, eve){
        eve = eve || window.event;

        var docPos    = this.getPosition(target);
        var mousePos  = this.mouseCoords(eve);
        return {x:mousePos.x - docPos.x, y:mousePos.y - docPos.y};
    }

	/** Take an item and add an onmousedown method so that we can make it draggable */
    this.makeDraggable = function(item) {
        if(!item) return;
        var self = this; // Keep the context of the TableDnd inside the function
        item.onmousedown = function(eve) {
            // Need to check to see if we are an input or not, if we are an input, then
            // return true to allow normal processing
            var target = getEventSource(eve);
            if (target.tagName == 'INPUT' || target.tagName == 'SELECT') return true;
            currenttable = self;
            self.dragObject  = this;
            self.mouseOffset = self.getMouseOffset(this, eve);
            
            var droppedRow = currenttable.dragObject;
            var rows = currenttable.table.tBodies[0].rows;
            var index = 0;
            for (; index<rows.length && rows[index].id != droppedRow.id; index++);
            index++;
            self.oldIndex = index;
            //alert("Mouse down oldnIdex = " + self.oldIndex);
           
            return false;
        }
        item.style.cursor = "move";
    }

    /** We're only worried about the y position really, because we can only move rows up and down */
    this.findDropTargetRow = function(y) {
        var rows = this.table.tBodies[0].rows;
		for (var i=0; i<rows.length; i++) {
			var row = rows[i];
			// John Tarr added to ignore rows that I've added the NoDnD attribute to (Header rows)
			var nodrop = row.getAttribute("NoDrop");
			if (nodrop == null || nodrop == "undefined") {  //There is no NoDnD attribute on rows I want to drag
				var rowY    = this.getPosition(row).y;
				var rowHeight = parseInt(row.offsetHeight)/2;
				if (row.offsetHeight == 0) {
					rowY = this.getPosition(row.firstChild).y;
					rowHeight = parseInt(row.firstChild.offsetHeight)/2;
				}
				// Because we always have to insert before, we need to offset the height a bit
				if ((y > rowY - rowHeight) && (y < (rowY + rowHeight))) {
					// that's the row we're over
					return row;
				}
			}
		}
		return null;
	}
}