package org.lsst.ccs.plugin.jas3.console;
   
   import java.io.OutputStreamWriter;
   import java.io.PrintWriter;
   import javax.swing.JDialog;
   import javax.swing.JOptionPane;
   import javax.swing.JScrollPane;
   import javax.swing.SwingUtilities;
   import org.freehep.application.studio.Studio;
  import org.freehep.jas.plugin.console.Console;
  import org.lsst.ccs.bus.BusMessage;
  import org.lsst.ccs.bus.DetailLevel;
  import org.lsst.ccs.bus.StatusListener;
  
  /**
   * Listen for alarms on the status bus, and if/when found popup an alarm dialog
   * @author tonyj
   */
  class AlarmListener implements StatusListener, Runnable {
  
      private final Studio studio;
      private JDialog dialog;
      private final Console console;
      private final PrintWriter printWriter;
  
      public AlarmListener(Studio studio) {
          this.studio = studio;
          console = new Console();
          printWriter = new PrintWriter(new OutputStreamWriter(console.getOutputStream(null)),true);
      }
      
      
      @Override
      public void onStatus(BusMessage bm) {
          // FIXME: What is the right test for alarm?
          if (bm.getDetailLevel() == DetailLevel.SEVERE) {
              ensureDialogVisible();
              printWriter.println(bm);
          }
      }
  
      @Override
      public void run() {
          if (dialog == null) {
              dialog = createDialog();
          }
          if (!dialog.isVisible()) {
              dialog.setVisible(true);
          }      
      }
  
      private void ensureDialogVisible() {
          SwingUtilities.invokeLater(this);
      }
  
      private JDialog createDialog() {
          JOptionPane pane = new JOptionPane();
          pane.setMessageType(JOptionPane.ERROR_MESSAGE);
          pane.setOptions(new Object[]{"Clear Alarm"});
          pane.setMessage(new JScrollPane(console));
          JDialog dlg = pane.createDialog(studio, "Alarm");
          dlg.setResizable(true);
          dlg.setModal(false);
          dlg.setAlwaysOnTop(true);
          return dlg;
      }
  }