package org.dhappy.mimis;

import java.util.logging.Logger;
import java.util.logging.Level;

import java.util.List;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.IOException;

import javax.script.ScriptEngineManager;
import javax.script.ScriptEngineFactory;
import javax.script.ScriptEngine;
import javax.script.ScriptException;

import java.security.AccessController;
import java.security.PrivilegedAction;

import netscape.javascript.JSObject;

import javax.swing.JApplet;

public class ScriptRunnerApplet extends JApplet {
    private static Logger log =
	Logger.getLogger( ScriptRunnerApplet.class.getName() );

    ScriptEngineManager engines = new ScriptEngineManager();
    ScriptEngine js = engines.getEngineByName( "javascript" );

    public void init() {
	log.info( "Initialized: " + ScriptRunnerApplet.class.getName() );
    }

    public void start() {
        js.put( "hostApplet", this );

	String script = this.getParameter( "script" );
	if( script != null ) {
	    eval( script );
	}
    }

    public void eval( JSObject script ) {
	log.info( "Eval script" );
    }

    public Object eval( String script ) {
	InputStream stream = null;
	
	String line;
	try {
	    try {
		stream = ScriptRunnerApplet.class.getResourceAsStream( script );
		if( stream == null ) {
		    log.log( Level.WARNING, "Could not get: " + script );
		} else {
                    final BufferedReader reader = new BufferedReader( new InputStreamReader( stream ) );

                    return AccessController.doPrivileged( new PrivilegedAction() {
                            public Object run() {
                                try {
                                    return js.eval( reader );
                                } catch( ScriptException se ) {
                                    log.log( Level.WARNING, se.getMessage(), se );
                                }
                                return null;
                            }
                        } );
		}
	    } finally {
		if( stream != null ) {
		    stream.close();
		}
	    }
	} catch( IOException ioe ) {
	    log.warning( ioe.getMessage() );
	}
        return null;
    }

    public Object guidClicked( final int guid ) {
        return AccessController.doPrivileged( new PrivilegedAction() {
                public Object run() {
                    try {
                        String callback = "guidClicked(" + guid + ")";
                        log.info( "ScriptRunnerApplet/guidClicked: " + callback );
                        return js.eval( callback );
                    } catch( ScriptException se ) {
                        log.warning( se.getMessage() );
                    }
                    return null;
                }
            } );
    }

    public void stop() {
	log.info( "Stop: " + ScriptRunnerApplet.class.getName() );
    }

    public void destroy() {
	log.info( "Destroying: " + ScriptRunnerApplet.class.getName() );
    }

    public static void main( String[] args ) {
	log.info( "Instantiated: " + ScriptRunnerApplet.class.getName() );
    }
}