package scs.execution_node.servant;

import java.io.FileInputStream;
import java.io.IOException;
import java.util.Properties;
import java.net.*;


import org.omg.CORBA.ORB;
import org.omg.CORBA.SystemException;
import org.omg.CORBA.UserException;
import org.omg.CosNaming.NameComponent;
import org.omg.CosNaming.NamingContextExt;
import org.omg.CosNaming.NamingContextExtHelper;
import org.omg.PortableServer.POA;
import org.omg.PortableServer.POAHelper;
import scs.core.ComponentId;


/**
 * Classe que implementa a aplicacao do execution node do SCS.
 */
public class ExecutionNodeApp {

	static Properties config = null;
	
	static boolean readConfiguration( String filename ) {
	    Properties properties = new Properties();
	    try {
	        properties.load(new FileInputStream(filename));
	    } catch (IOException e) {
	    	System.err.println(e);
	    	return false;
	    }
	    config = properties;
	    return true;
	}
	
	/**
	 * main: Recebe como argumento na linha de comando o host e a porta onde o 
	 * servico de nomes Corba est� dispon�vel, para localiza��o dos componentes
	 * do execution node
	 * Caso n�o sejam especificados, toma como default localhost e porta 1050
	 */
	public static void main(String[] args) {
		try {
			
			if(args.length < 1) {
				System.err.println("Syntax: ExecutionNodeApp <properties-file>");
				System.exit(1);
			}
			
			if(!readConfiguration(args[0])) {
				System.err.println("Error reading configuration from file" + args[0]);
			}
			
            Properties props = new Properties();
            props.put("org.omg.CORBA.ORBInitialPort", config.getProperty("org.omg.CORBA.ORBInitialPort", "1050"));
            props.put("org.omg.CORBA.ORBInitialHost", config.getProperty("org.omg.CORBA.ORBInitialHost", "localhost"));

            System.out.println("ORB Host: " + props.getProperty("org.omg.CORBA.ORBInitialHost"));
        	System.out.println("ORB Port "+ props.getProperty("org.omg.CORBA.ORBInitialPort") );
        	
        	ORB orb = ORB.init(args, props);			

        	POA poa = POAHelper.narrow(orb.resolve_initial_references("RootPOA"));
        	poa.the_POAManager().activate();
			//System.err.println("Resolveu o RootPOA");
			
			InetAddress localAddr = InetAddress.getLocalHost();
            String addrString = localAddr.toString();
            String[] ipAddress = new String[2];
            ipAddress = addrString.split("/");
            String execName = "ExecutionNode" + "-" + ipAddress[1];

            ExecutionNodeComponent servant = new ExecutionNodeComponent(config);
            servant.createComponentId(new ComponentId("ExecutionNode", 1));

            org.omg.CORBA.Object objNS = orb.resolve_initial_references("NameService");
            //System.err.println("Resolveu o NameService");
            NamingContextExt rootContext = NamingContextExtHelper.narrow( objNS );

            //System.err.println(" Registrando execution node: ");
            NameComponent[] nc = rootContext.to_name(execName);

            //System.err.println("Binding ExecutionNodeComponent servant to context ExecutionNode ...");
            rootContext.rebind( nc, poa.servant_to_reference( servant ) );
			
            System.err.println("Running Execution Node " + execName + "...");
		    orb.run();
		}
		catch (UserException e) {
			e.printStackTrace();
		}
		catch (SystemException e) {
			e.printStackTrace();
		}
		catch (UnknownHostException e) {
            e.printStackTrace();
        }
	
	}

}