// Define an anonymous function;
// serves as our main loop,
// limits the scope of variables
(function(){
 
	/*********************************************************************/
	// String : A function for retrieving a translation if one exists
	function text( sText )
	{
		// If the version of the application supports qsTr()
		if( typeof( qsTr ) != "undefined" ){
			// Return the translated (if any) text
			return qsTr( sText );
		}
 
		// Return the original text
		return sText;
	};
 
	/*********************************************************************/
	// Boolean : A function for testing whether or not a QObject instance
	// inherits one of a list of types
	function inheritsType( oObject, aTypeNames )
	{
		// If the object does not define the 'inherits' function
		if( !oObject || typeof( oObject.inherits ) != "function" ){
			// We are done... it is not a QObject
			return false;
		}
 
		// Iterate over the list of type names
		for( var i = 0, nTypes = aTypeNames.length; i < nTypes; i += 1 ){
			// If the object does not inherit the 'current' type
			if( !oObject.inherits( aTypeNames[i] ) ){
				// Next!!
				continue;
			}
 
			// Return the result
			return true;
		}
 
		// Return the result
		return false;
	};
 
	/*********************************************************************/
	// Define common message variables
	var sTitle = text( "Selection Error" );
	var sMessage = text( "An instance node in the scene must be selected to continue." );
	var sButton = text( "&OK" );
 
	// Get the root of the primary selection
	var oNode = Scene.getPrimarySelection();
 
	// If nothing is selected or the selected node is not a node instance
	if( !oNode || !inheritsType( oNode, ["DzInstanceNode"] ) ||
 	inheritsType( oNode, ["DzInstanceGroupNode"] ) ){
		// Alert the user
		MessageBox.warning( sMessage, sTitle, sButton );
 
		// We are done...
		return;
	}
 
	// Declare an array to catch 'like' sibling instances
	var aInstances = [];
 
	// Get the node parent
	var oParent = oNode.getNodeParent();
	// Get the target
	var oTarget = oNode.getTarget();
	// Get the mode property
	var oModeProperty = oNode.getCopyModeControl();
	// Get the mode
	var nMode = oModeProperty.getValue();
 
	// Declare working variables
	var oSelectedNode;
 
	// Get the selected nodes
	var sSelectedNodes = Scene.getSelectedNodeList();
	// Iterate over the selected nodes
	for( var i = 0; i < sSelectedNodes.length; i += 1 ){
		// Get the 'current' node
		oSelectedNode = sSelectedNodes[ i ];
 
		// If the node is not an instance,
		// is an instance group,
		// node parents are not the same,
		// targets are not the same,
		// or the mode is not the same
		if( !inheritsType( oSelectedNode, ["DzInstanceNode"] ) ||
	 	inheritsType( oSelectedNode, ["DzInstanceGroupNode"] ) ||
		!pointersAreEqual( oSelectedNode.getNodeParent(), oParent ) ||
		!pointersAreEqual( oSelectedNode.getTarget(), oTarget ) ||
		oSelectedNode.getCopyModeControl().getValue() != nMode ){
			// Skip it...
			continue;
		}
 
		// Add the node
		aInstances.push( oSelectedNode );
	}
 
	// If we have instances
	if( aInstances.length > 0 ){
		// Declare working variables
		var oGroupNode, oInstanceNode, oInstanceItem;
 
		// Get the preview property
		var oPreviewProperty = oSelectedNode.getPreviewControl();
		// Get the preview
		var bPreview = oPreviewProperty.getValue();
 
		// Create a new instance group
		oGroupNode = new DzInstanceGroupNode();
		// Set the name of the instance group; based on the primary selection
		oGroupNode.name = String("%1_InstanceGroup").arg( oSelectedNode.name );
 
		// Get the label of the source node
		var sLabel = oSelectedNode.getLabel();
		// Strip the number from the label
		sLabel = Scene.stripLabelNumber( sLabel );
		// Get a unique label
		sLabel = Scene.getUniqueTopLevelLabel( String("%1 Instance Group").arg( sLabel ) );
 
		// Set the label of the instance group
		oGroupNode.setLabel( sLabel );
 
		// Add the instance group to the scene
		Scene.addNode( oGroupNode );
 
		// Put the instance group in item editing mode
		oGroupNode.beginItemEdit();
 
		// Iterate over the instance nodes
		for( var i = 0; i < aInstances.length; i += 1 ){
			// Get the 'current' instance
			oInstanceNode = aInstances[ i ];
 
			// Add the instance as a child to the group
			oGroupNode.addNodeChild( oInstanceNode, false );
 
			// Create an instance item
			oInstanceItem = oGroupNode.createItem();
 
			// Copy pertinent data from the instance
			oInstanceItem.copyTransformFromNode( oInstanceNode );
			oInstanceItem.name = oInstanceNode.name;
			oInstanceItem.setLabel( oInstanceNode.getLabel() );
 
			// Remove the instance from the scene
			Scene.removeNode( oInstanceNode );
		}
 
		// We are done editing items in the instance group
		oGroupNode.finishItemEdit();
 
		// Set the target
		oGroupNode.getTargetControl().setValue( oTarget );
		// Set the mode
		oModeProperty.setValue( nMode );
		// Set the preview
		oPreviewProperty.setBoolValue( bPreview );
 
		// Get the bounding box for the instance group
		var boxBounding = oGroupNode.getLocalBoundingBox();
		// If we've got a bounding box
		if( boxBounding ){
			// Get the minimum corner of the bounding box
			var vecBoundingBottom = boxBounding.min;
			// Get the center of the bounding box
			var vecBoundingCenter = boxBounding.getCenter();
			// Get the maximum corner of the bounding box
			var vecBoundingTop = boxBounding.max;
			// Make sure the top is at least 1 unit away
			vecBoundingTop.y = Math.max( 1.0, vecBoundingTop.y );
 
			// Start the origin at the center of the bounding box
			var vecOrigin = vecBoundingCenter;
			// Set the origin Y to the bottom of the bounding box
			vecOrigin.y = vecBoundingBottom.y;
			// Set the origin of the instance group
			oGroupNode.setOrigin( vecOrigin, true );
			// Set the end point
			oGroupNode.setEndPoint( new DzVec3( vecBoundingCenter.x, vecBoundingTop.y, vecBoundingCenter.z ), true );
		}
	}
 
	// If the primary node was parented
	if( oParent ){
		// Parent the instance group to the same node
		oParent.addNodeChild( oGroupNode, false );
	}
 
// Finalize the function and invoke
})();