package org.openslx.virtualization.configuration.logic;

import org.openslx.virtualization.configuration.VirtualizationConfiguration;
import org.openslx.virtualization.configuration.VirtualizationConfiguration.EtherType;
import org.openslx.virtualization.configuration.VirtualizationConfiguration.UsbSpeed;
import org.openslx.virtualization.configuration.VirtualizationConfigurationException;
import org.openslx.virtualization.configuration.data.ConfigurationDataDozModServerToStatelessClient;
import org.openslx.virtualization.configuration.transformation.TransformationException;

public class ConfigurationLogicDozModServerToStatelessClient
		extends ConfigurationLogic<ConfigurationDataDozModServerToStatelessClient>
{
	private static final String CONFIGURATION_LOGIC_NAME = "Transformation of virtualization configuration during download from DozMod server to stateless client";

	private static final EtherType CONFIGURATION_DEFAULT_ETHERNET_TYPE = EtherType.NAT;

	public ConfigurationLogicDozModServerToStatelessClient()
	{
		super( ConfigurationLogicDozModServerToStatelessClient.CONFIGURATION_LOGIC_NAME );
	}

	private void validateInputs( VirtualizationConfiguration<?, ?, ?, ?> config,
			ConfigurationDataDozModServerToStatelessClient args )
			throws TransformationException
	{
		if ( config == null || args == null ) {
			throw new TransformationException( "Virtualization configuration or input arguments are missing!" );
		} else if ( args.getDisplayName() == null || args.getDisplayName().isEmpty() ) {
			throw new TransformationException( "Valid display name is not specified!" );
		}
	}

	@Override
	public void transform( VirtualizationConfiguration<?, ?, ?, ?> config,
			ConfigurationDataDozModServerToStatelessClient args )
			throws TransformationException
	{
		// check if input parameters for a transformation are valid
		this.validateInputs( config, args );

		// set display name of lecture
		if ( !config.addDisplayName( args.getDisplayName() ) ) {
			throw new TransformationException( "Can not set display name in virtualization configuration!" );
		}

		// append hard disk drive
		if ( !config.addHddTemplate( "%VM_DISK_PATH%", "%VM_DISK_MODE%", "%VM_DISK_REDOLOGDIR%" ) ) {
			throw new TransformationException( "Can not configure hard disk in virtualization configuration!" );
		}

		// append default NAT interface
		if ( !config.addEthernet(
				ConfigurationLogicDozModServerToStatelessClient.CONFIGURATION_DEFAULT_ETHERNET_TYPE ) ) {
			throw new TransformationException( "Can not configure NAT interface in virtualization configuration!" );
		}

		// set the guest OS if specified
		if ( args.getOsId() != null ) {
			config.setOs( args.getOsId() );
		}

		// disable USB if necessary
		if ( !args.hasUsbAccess() ) {
			config.setMaxUsbSpeed( UsbSpeed.NONE );
		}

		// apply settings to run virtualized system in a stateless manner
		try {
			config.transformNonPersistent();
		} catch ( VirtualizationConfigurationException e ) {
			throw new TransformationException( e.getLocalizedMessage() );
		}
	}
}