#include "ReaderWriterTerrainMod.h"

ReaderWriterTerrainMod::ReaderWriterTerrainMod()
{
	supportsExtension( "terrainmod", "Terrain modification pseudo loader");

	extensionToAdd = ".terrainmod";
}

ReaderWriterTerrainMod::ReadResult ReaderWriterTerrainMod::readNode( const std::string& file, const osgDB::ReaderWriter::Options* options) const
{
	// Check if its a valid file for this pseudo loader
	std::string ext = osgDB::getLowerCaseFileExtension( file );
	if( !acceptsExtension(ext) )
		return ReadResult::FILE_NOT_HANDLED;

	// Strip the pseudo-loader extension
    std::string realName = osgDB::getNameLessExtension( file );

	// check if stripped file exists
	std::string fileName = osgDB::findDataFile( realName, options );
	if( fileName.empty() )
		return ReadResult::FILE_NOT_FOUND;

	// Load real file
	osg::Node *node = osgDB::readNodeFile( fileName, options );
    if( !node )
    {
        // propagate the read failure upwards
        OSG_WARN << "Subfile \"" << fileName << "\" could not be loaded" << std::endl;
        return ReadResult::FILE_NOT_HANDLED;
    }

	// Traverse through loaded graph, check for PagedLOD and modify all filenames of external references
	// This ensures ensures that higher LODs are loaded via terrainmod pseudo loader as well.
	ModificationVisitor modVisitor(extensionToAdd);
	node->accept( modVisitor );

	return node;
}

// Add ourself to the Registry to instantiate the reader/writer.
REGISTER_OSGPLUGIN(terrainmod, ReaderWriterTerrainMod)