//////////////////////////////////////////////////////////////////////////////////////

// TABLES

/////////////

function elem_tr_add( top_elem_name , sub_elem_name , method , parent_num , content_html ) {

var parent_id = sub_elem_name + parent_num;

    if ( !row_num ) var row_num = document.getElementById( top_elem_name ).getElementsByTagName( 'tr' ).length; 

row_num++;

var new_id = sub_elem_name + row_num;

    if ( method == 'before' ) {
    
    var next_elem = document.getElementById( parent_id );
    
    }
    
    if ( method == 'after' ) {
    
    var next_elem = document.getElementById( parent_id ).nextSibling;
    
    }

var tbody = document.getElementById( parent_id ).parentNode;
var tr = document.createElement( 'tr' );
//var td = document.createElement( 'td' );

tr.setAttribute( 'id' , new_id );
//tr.appendChild( td );

tbody.insertBefore( tr , next_elem );

var tr_content_new = content_html[1];

//tr_content_new = tr_content_new.replace( /{id}/g , new_id );
tr_content_new = tr_content_new.replace( /{row_num}/g , row_num );

document.getElementById( new_id ).innerHTML = tr_content_new;

}

// -------------------------------------------------------------------------------------

function hd_table_row_hover( this_row , bg_color ) {

    if (bg_color) {
    
    this_row.style.backgroundColor = bg_color;
    
    } else {
    
    this_row.style.backgroundColor = '';
    
    }

}

// -------------------------------------------------------------------------------------

function hd_tables_row_duplicate( sample_id , target_id , target_num ) {

var sample = document.getElementById( sample_id ).cloneNode(true);
var target = document.getElementById( target_id + target_num ).parentNode;

sample.Name = target_id + (target_num + 1);
sample.style.display = '';

target.appendChild( sample );

}

// -------------------------------------------------------------------------------------

/** 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(ev){

    if (currenttable && currenttable.dragObject) {

    currenttable_height = document.getElementsByClassName('bottom-area')[0].offsetTop;

        ev   = ev || window.event;
        var mousePos = currenttable.mouseCoords(ev);
        var y = mousePos.y - (currenttable.mouseOffset.y - (currenttable_height / 3));
        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";

            var rows = currenttable.dragObject.getElementsByTagName('td');
    		    
                for (var i=0; i<rows.length; i++) {

             		rows[i].style.backgroundColor = "#eee"; // fix ie opacity on bold
        			  
                }  
            
            // 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(ev){
    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;

    /** 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) {


                
    }

	/** 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(ev){
        if(ev.pageX || ev.pageY){
            return {x:ev.pageX, y:ev.pageY};
        }
        return {
            x:ev.clientX + document.body.scrollLeft - document.body.clientLeft,
            y:ev.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, ev){
        ev = ev || window.event;

        var docPos    = this.getPosition(target);
        var mousePos  = this.mouseCoords(ev);
        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(ev) {

            // 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(ev);
            
            if (
            target.tagName != 'INPUT' && 
            target.tagName != 'SELECT' && 
            target.tagName != 'TEXTAREA'&&
            target.tagName != 'A'
            ) {

            var rows = self.table.tBodies[0].getElementsByTagName('td');
    		    
                for (var i=0; i<rows.length; i++) {
        
                rows[i].style.opacity = "0.5";
                rows[i].style.filter = "alpha(opacity=50)";
                rows[i].style.backgroundColor = "#ffffff"; // fix ie opacity on bold
                
        			  }

            currenttable = self;
            self.dragObject  = this;
            self.mouseOffset = self.getMouseOffset(this, ev);
            
            var rows = self.dragObject.getElementsByTagName('td');
    		    
                for (var i=0; i<rows.length; i++) {
        
                rows[i].style.opacity = "1";
                rows[i].style.filter = "alpha(opacity=100)";
                rows[i].style.backgroundColor = "#eee"; // fix ie opacity on bold
        			  
                }            

            return false;
            
            } else {

            
                if (target.tagName == 'INPUT') item.style.cursor = "auto";

            //item.style.cursor = "move";
            
            }
            
        }
        
        item.onmouseup = function(ev) {
        
        var rows = self.table.tBodies[0].getElementsByTagName('td');
		    
            for (var i=0; i<rows.length; i++) {
    
            rows[i].style.opacity = "1";
            rows[i].style.filter = "alpha(opacity=100)";
            rows[i].style.backgroundColor = "#ffffff"; // fix ie opacity on bold
    			  
            }

            return false;
        }       

        item.onmouseover = function(ev) {

        var target = getEventSource(ev);
        
            if (
            target.tagName != 'INPUT' && 
            target.tagName != 'SELECT' && 
            target.tagName != 'TEXTAREA'&&
            target.tagName != 'A'
            ) {

            var rows = item.getElementsByTagName('td');
    		    
                for (var i=0; i<rows.length; i++) {

             		rows[i].style.backgroundColor = "#eee"; // fix ie opacity on bold
        			  
                }

            moverowtip(self);
            item.style.cursor = "n-resize";
            
            } else {
            
                if (target.tagName == 'INPUT') {
                
                item.style.cursor = "auto";
                
                }
            
            }

        }
        
        item.onmouseout = function(ev) {
         
        var target = getEventSource(ev);
        
            if (
            target.tagName != 'INPUT' && 
            target.tagName != 'SELECT' && 
            target.tagName != 'TEXTAREA'&&
            target.tagName != 'A'
            ) {

            var cols = item.getElementsByTagName('td');
    		    
                for (var i=0; i<cols.length; i++) {

             		cols[i].style.backgroundColor = "#ffffff"; // fix ie opacity big on bold

                }
            
            }

        }        

    item.style.cursor = "n-resize";

    }

    /** We're only worried about the y position really, because we can only move rows up and down */
    this.findDropTargetRow = function(y) {

    var elems = this.table.getElementsByTagName('INPUT');
    var j = 0;
    
        for (var i=0; i<elems.length; i++) {
    
         		if (elems[i].className == 'counter') {
            
            j++;
         		elems[i].value = j;

         		}
    
        }
     
        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;
	}

}