package fr.dgac.ivy ;
import java.io.*;
import java.util.*;
import gnu.getopt.Getopt;

/**
 * terminal implementation in java of the ivyprobe.
 * For a graphical version, see TestIvySwing 
 * @see		fr.dgac.ivy.TestIvySwing
 * @author	Yannick Jestin
 * @author	<a href="http://www.tls.cena.fr/products/ivy/">http://www.tls.cena.fr/products/ivy/</a>
 * 
 *
 * Changelog:
 * 1.0.12
 *   - Probe can now send empty strings on keyboard input
 *   - rewritten with a looping thread on stdin to allow a cleaner exit on die
 *     message : not very good
 *   - processes .help, .die , .quit and .bye commands
 *   - it is possible to rename the JPROBE on the bus with the -n switch, it can
 *     circumvent name collisions during tests
 *     e.g: java fr.dgac.ivy.Probe -n JPROBE2
 * 1.0.10
 * 	exits on end of user input
 *	handles multiple domains - it was a IvyWatcher problem -
 */
class Probe implements IvyApplicationListener, IvyMessageListener, Runnable {

  /**
   *  help message for the standalone program
   */
  public static final String helpCommands = "Available commands:\n.die CLIENTNAME sends a die message\n.bye quits the application\n.quit idem\n.list lists the available clients\n.ping sends a ping request if IVY_PING is enabled";
  public static final String helpmsg = "usage: java fr.dgac.ivy.Probe [options] [regexp]\n\t-b BUS\tspecifies the Ivy bus domain\n\t-n ivyname (default JPROBE)\n\t-q\tquiet, no tty output\n\t-d\tdebug\n\t-h\thelp\n\n\t regexp is a Perl5 compatible regular expression";

  public static void main(String[] args) throws IvyException {
    Getopt opt = new Getopt("Probe",args,"n:b:dh");
    int c;
    String domain=Ivy.getDomain(null);
    String name="JPROBE";
    while ((c = opt.getopt()) != -1) switch (c) {
    case 'b':
      domain=opt.getOptarg();
      break;
    case 'n':
      name=opt.getOptarg();
      break;
    case 'd':
      System.setProperty("IVY_DEBUG","yes");
      break;
    case 'h':
    default:
	System.out.println(helpmsg);
	System.exit(0);
    } // getopt
    Probe p = new Probe();
    Ivy bus=new Ivy(name,name+" ready",p);
    for (int i=opt.getOptind();i<args.length;i++) {
      System.out.println("you want to subscribe to " + args[i]);
      bus.bindMsg(args[i],p);
    }
    System.out.println("broadcasting on "+domain);
    bus.start(domain);
    p.start(bus);
  }

  private BufferedReader in;
  private volatile Thread looperThread;
  private Ivy bus;

  Probe() {
    in = new BufferedReader(new InputStreamReader(System.in));
    looperThread=new Thread(this);
  }

  public void start(Ivy bus) {
    this.bus=bus;
    looperThread.start();
  }

  public void run() {
    Thread thisThread=Thread.currentThread();
    String s;
    while (looperThread==thisThread) {
      // infinite loop on keyboard input
      try {
	s=in.readLine();
	parseCommand(s);
      } catch (NullPointerException e) {
	// EOF triggered by a ^D, for instance
	bus.stop();
      } catch (IOException e) {
	System.out.println("ioe ?");
	e.printStackTrace();
	bus.stop();
      } catch (InterruptedException ie) {
	System.out.println("allo ?");
      }
    } //while
    System.out.println("End of looping");
    System.exit(0);
  }

  void parseCommand(String s) throws IOException, InterruptedException {
    // System.out.println("parsing the ["+s+"] (length "+s.length()+") string");
    // crude parsing of the ".xyz" commands
    // TODO use regexps instends of String.lastIndexOf(String)
    if (s.length()==0) {
      System.out.println("-> Sent to " +bus.sendMsg(s)+" peers");
    } else if (s.lastIndexOf(".die ")>=0){
      String target=s.substring(5);
      Vector v=bus.getIvyClientsByName(target);
      if (v.size()==0) {
	System.out.println("no Ivy client with  the name \""+target+"\"");
      }
      for (int i=0;i<v.size();i++) {
	((IvyClient)v.elementAt(i)).sendDie();
      }
    } else if (s.lastIndexOf(".ping ")>=0){
      String target=s.substring(6);
      Vector v=bus.getIvyClientsByName(target);
      if (v.size()==0) {
	System.out.println("no Ivy client with  the name \""+target+"\"");
      }
      for (int i=0;i<v.size();i++) {
	((IvyClient)v.elementAt(i)).sendPing("test");
      }
    } else if ( (s.lastIndexOf(".quit")>=0)||(s.lastIndexOf(".bye")>=0)){
      bus.stop();
      System.exit(0);
    } else if (s.lastIndexOf(".list")>=0) {
      Vector v = bus.getIvyClients();
      System.out.println(v.size()+" clients on the bus");
      for (int i=0;i<v.size();i++) {
	System.out.println(" -> "+((IvyClient)v.elementAt(i)).getApplicationName());
      }
    } else if ( s.lastIndexOf(".help")>=0) {
      System.out.println(helpCommands);
    } else if ( s.charAt(0)=='.') {
      System.out.println("this command is not recognized");
      System.out.println(helpCommands);
    } else {
      System.out.println("-> Sent to " +bus.sendMsg(s)+" peers");
    }
  } // parseCommand

  public void connect(IvyClient client) {
    System.out.println(client.getApplicationName() + " connected " );
    for (java.util.Enumeration e=client.getRegexps();e.hasMoreElements();)
      System.out.println(client.getApplicationName() + " subscribes to "
        +e.nextElement() );
  }

  public void disconnect(IvyClient client) {
    System.out.println(client.getApplicationName() + " disconnected " );
  }

  public void die(IvyClient client, int id) {
    System.out.println("received die msg from " + client.getApplicationName() );
    Thread t = looperThread;
    looperThread = null;
    t.interrupt(); // TODO does'nt work
    System.exit(0);
  }

  public void directMessage(IvyClient client, int id, String arg) {
   System.out.println(client.getApplicationName() + " direct Message "+ id + arg );
  }

  public void receive(IvyClient client, String[] args) {
    String s=client.getApplicationName() + " sent";
    for (int i=0;i<args.length;i++) s+=" '"+args[i]+"'";
    System.out.println(s);
  }

}