// ===========================================================================
// 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.
// ===========================================================================
global proc string isOperationAllowedOnReference(string $op, string $refNode)
//
//	Description:
//		Determine whether the specified reference operation is allowed on the 
//	specified reference node. The routine returns a warning message describing 
//  the reason that the operation is not allowed.
//
//		expeccted values of $op and corresponding return values:
//		addProxy		->	Reference proxies cannot be added to file references when used within assembly representations.
//		removeProxy		->	Reference proxies cannot be removed from file references when used within assembly representations.
//
{
	string $warningMsg = "";
	
	python("import maya.app.general.assemblyUtils as assemblyUtils");
	string $command = "assemblyUtils.isReferenceInAssembly(\"" + $refNode + "\")";
	int $isReferenceInAssembly = python($command);
	if($isReferenceInAssembly)
	{
		if("addProxy" == $op)
		{
			$warningMsg = (uiRes("m_isOperationAllowedOnReference.kCannotAddProxyInAssembly"));
		}
		else if("removeProxy" == $op)
		{
			$warningMsg = (uiRes("m_isOperationAllowedOnReference.kCannotRemoveProxyInAssembly"));
		}
	}
	
	return $warningMsg;
}