/*
 * Copyright (c) 2008 Manuel Traut and Volker Dahnke
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 *
 * Contributors: Manuel Traut
 */

package YalpOutputs.YalpVlcTelnetOutput;

import YalpInterfaces.*;

import org.omg.CosNaming.*;
import org.omg.CosNaming.NamingContextPackage.*;
import org.omg.CORBA.*;

import java.util.*;
import java.io.IOException;

import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;

/*
 * Class YalpOutputPluginImpl
 *
 * <em>Implements VLC Telnet Streamer as YALP Plugin</em>
 *
 * @author Volker Dahnke / Manuel Traut
 * @version 0.7 10-09-2008
 */
public class YalpOutputPluginImpl extends OutputPluginInterfacePOA {

	private ORB orb;
	private static Process vlcPlayer = null;
	private StreamCounter streamCounter= new StreamCounter();
	private LinkedList<Output> currentStreams = new LinkedList<Output>();
	private int startPort;
	private String hostIP;
	private String vlcCommand;
	private ServerControlInterface srvCon;
	private PluginInfo pluginInfo;

	private String log4jFile = "log4j_output_plugin.conf";

	private static Logger logger =
		Logger.getLogger("Yalp.OutputPlugins.VlcTelnetOutput.YalpOutputPluginImpl");

	public YalpOutputPluginImpl()
	{
		PropertyConfigurator.configureAndWatch(log4jFile);
		logger.debug("YalpOutputPluginImpl()");
	}

/*
 * starts a vlc player in a new process
 *
 * @param serverIP
 * 		where vlcStreamer is running
 * @param startport
 * 		first port used for streaming
 * @param vlcCmd
 * 		path and name of vlc player executable
 *
 * @throws RemoteException
 * @throws ClassNotFoundException
 */
	public void setORB(ORB _orb) {

		logger.debug("setORB()");

		orb = _orb;

		pluginInfo = new PluginInfo();
		pluginInfo.name = "VLC Telnet Streamer";
		pluginInfo.description = "creates streams via VLC players telnet interface";
		pluginInfo.type = PluginType.OUTPUT_PLUGIN;
		pluginInfo.access = new AccessInfo();
		pluginInfo.access.name = "stream provided by vlc player";
		pluginInfo.access.description = "streams can be displayed with vlc player";
		pluginInfo.access.executable = "vlc";
		pluginInfo.access.params = "";
		pluginInfo.access.type = AccessType.STREAM;

		/* t.b.d. read vlccmod, startport, hostip from config xml */
		String vlcCmd = "/usr/bin/vlc";
		vlcCommand = vlcCmd + " --reset-config -I telnet";
		startPort = 9000;
		hostIP = "127.0.0.1";

		if(vlcPlayer == null){
			try{
				vlcPlayer = Runtime.getRuntime().exec(this.vlcCommand);
			} catch(IOException e){
				System.out.println("server.VlcStreamer.java: Streamingserver failed");
			}
		}
	}

	public void shutdown() {
		logger.debug("shutdown()");
		/* t.b.d. */
	}

/*
 * controls Streaming (start, stop, etc)
 *
 * @param howtoStream
 *    specifies streaming options
 */
	public void control(OutputHolder howtoStream, YalpErrorHolder err) {

		logger.debug("control(howtoStream.value.id: "+howtoStream.value.id+")");

		YalpError error = new YalpError();
		error.descr = "";
		error.msg = "";
		error.code = YalpErrorCode.OK;
		error.level = YalpErrorLevel.ERROR_LEVEL_DEBUG;

		err.value = error;

		Output output = new Output();
		output = howtoStream.value;
		howtoStream.value = output;

		switch( howtoStream.value.outputAction.value() ) {

			case Action._START:
				start(howtoStream.value);
				break;

			case Action._STOP:
				stop(howtoStream.value);
				break;

			case Action._PAUSE:
				pause(howtoStream.value);
				break;

			case Action._PLAY:
				play(howtoStream.value);
				break;

			case Action._FORWARD:
				next(howtoStream.value);
				break;

			//add sth. to current playing stream
			case Action._CREATE:
				add(howtoStream.value);
				break;

			default:
				System.out.println("server.VlcStreamer.control: action not supported");
				break;
		}
	}

/*
 * get plugin infos
 *
 * @param PluginInfoHolder (out)
 * @param YalpErrorHolder (out)
 */
	public void getInfo(PluginInfoHolder info, YalpErrorHolder err)
	{
		logger.debug("getInfo()");
		info = new PluginInfoHolder();
		err = new YalpErrorHolder();
		err.value.code = YalpErrorCode.OK;
		info.value = pluginInfo;
	}

/*
 * register Stream at vlcPlayer
 * @param howtoStream
 */
	private void add(Output howtoStream){

		logger.debug("add()");

		String input = "";
		TelnetInterface telnet = new TelnetInterface(hostIP, 4212, "admin");

		input += "new "+howtoStream.info.name+" broadcast enabled";

		for(int i=0; i < howtoStream.playlist.length; i++){
			input += " input file://";
			input += howtoStream.playlist[i].path + "/";
			input += howtoStream.playlist[i].fileName;
		}

		telnet.exec(input);
		telnet.close();
}

/*
 * request Streaming of submitted Output
 *
 * @param stream
 * 		which should be streamed
 * @return Output
 * 		extends Information "how to receive" of submitted Output
 */
	public Output request(Output stream) {

		logger.debug("request()");

		//stream.setIP(hostIP);     for UDP
		stream.info.name = streamName();
		stream.info.params = new Integer(++startPort).toString();
		currentStreams.add(stream);
		return stream;
	}


/*
 * starts streaming of submitted streamInfo
 * @param howtoStream
 */
	private void start(Output howtoStream) {

		logger.debug("start()");

		String newString, setup2;
		streamCounter.actualStreams++;
		streamCounter.allStreams++;

		switch (howtoStream.info.type.value()) {
			case AccessType._STREAM:
				newString  = "control "+howtoStream.info.name+" broadcast enabled";
				break;

			default:
				System.out.println("server.VlcStreamer.start: unsupported Type");
				return;
		}

		String comp = "#transcode{vcodec=DIV3,vb=256,scale=1,";
		comp += "acodec=mpga,ab=192,channels=2}";
		comp += ":duplicate{dst=";

		setup2 = "setup "+howtoStream.info.name+" output "+comp+"std{access=udp,";
		setup2 +="mux=ts,";
		setup2 +="dst=" + howtoStream.destIp + ":9993";// + howtoStream.info.params;
		setup2 += "}";

		String control = "control "+howtoStream.info.name+" play";

		TelnetInterface telnet = new TelnetInterface(hostIP, 4212, "admin");
		telnet.exec(newString);
		telnet.exec(setup2);
		telnet.exec(control);
		telnet.close();
	}

/*
 * plays submitted streamInfo
 * @param howtoStream
 */
	private void play(Output howtoStream){

		logger.debug("play()");

		String control = "control "+howtoStream.info.name+" play";
		// telnet connection
		TelnetInterface telnet = new TelnetInterface(hostIP, 4212, "admin");
		telnet.exec(control);
		// close telnet connection
		telnet.close();
	}

/*
 * pause submitted streamInfo
 * @param howtoStream
 */
	private void pause(Output howtoStream){

		logger.debug("pause()");

		String control = "control "+howtoStream.info.name+" pause";
		logger.debug("client.VlcStreamer: Telnetcmd: " + control);

		TelnetInterface telnet = new TelnetInterface(hostIP, 4212, "admin");
		telnet.exec(control);
		telnet.close();
	}

/*
 * go to next file in playlist
 *
 * @param howtoStream
 */
	private void next(Output howtoStream){

		logger.debug("next()");

		String control = "control "+howtoStream.info.name+" seek 100";
		logger.debug("client.VlcStreamer: Telnetcmd: " + control);
		TelnetInterface telnet = new TelnetInterface(hostIP, 4212, "admin");
		telnet.exec(control);
		telnet.close();
	}

/*
 * stop streaming, delete stream
 *
 * @param howtoStream
 */
	private void stop(Output howtoStream){

		logger.debug("stop()");

		String del = "del "+howtoStream.info.name;
		this.streamCounter.actualStreams--;
		TelnetInterface telnet = new TelnetInterface(hostIP, 4212, "admin");
		telnet.exec(del);
		telnet.close();
		currentStreams.remove(howtoStream);
	}

/*
 * calculates streamName
 * @return String streamName
 */
	private String streamName(){
		logger.debug("streamName()");
		String streamName = "stream";
		streamName += streamCounter.allStreams;
		return streamName;
	}

/*
 *  stops the streaming server
 *
 */
	public void quit(){
		logger.debug("quit()");
		vlcPlayer.destroy();
	}

/*
 * returns the streamcounter
 * @return StreamCounter
 */
	public StreamCounter getStreamCounter(){
		logger.debug("getStreamCounter()");
		return this.streamCounter;
	}

}