// ===========================================================================
// Copyright 2018 Autodesk, Inc. All rights reserved.
//
// Use of this software is subject to the terms of the Autodesk license
// agreement provided at the time of installation or download, or which
// otherwise accompanies this software in either electronic or hard copy form.
// ===========================================================================
// 
// 


//
//	Description:
//		If nodeName is already in the selection list, this returns the index
//		of nodeName in the ordered selection list.  Otherwise, if nodeName
//		was just selected and is not already in the ordered selection list, this
//		returns -1
//
proc int fltSelectionIndex( string $nodeName, string $componentName)
{
	global string $selectedLPs[];
	int $i;
	
	for ( $i = 0; $i < size($selectedLPs) ; $i += 2 ) {
		if ( ($selectedLPs[ $i ] == $nodeName) &&
			 ($selectedLPs[ $i + 1 ] == $componentName) )
			 return $i;
	}

	return -1;
}


//
//	Description:
//		Maintains a list of the selected light points in the order
//		in which they were selected.
//		
global proc fltSelectInOrder()
{
	global string $selectedLPs[] = {""};
	string $newSelectedLPs[];
	int $isStillSelected[];
	string $lpQuery[] = `fltLightPoints -q`;
	int $i;
	int $cursor = 0;
	int $foundIndex;

	for ( $i = size($lpQuery) - 2; $i >= 0; $i -= 2 ) {
		$foundIndex = fltSelectionIndex( $lpQuery[$i], $lpQuery[$i+1] );
		if ( $foundIndex == -1 ) {
			$newSelectedLPs[$cursor] = $lpQuery[$i];
			$newSelectedLPs[$cursor + 1] = $lpQuery[$i+1];
			$cursor += 2;
		} else {
			$isStillSelected[$foundIndex] = true;
		}
	}

	for ( $i = 0; $i < size($selectedLPs); $i += 2 ) {
		if ( $isStillSelected[$i] ) {
			$newSelectedLPs[$cursor] = $selectedLPs[$i];
			$newSelectedLPs[$cursor+1] = $selectedLPs[$i+1];
			$cursor += 2;
		}
	}
	
	$selectedLPs = $newSelectedLPs;	
}