/*
 * Jalview - A Sequence Alignment Editor and Viewer (Version 2.4.1)
 * Copyright (C) 2009 AM Waterhouse, J Procter, G Barton, M Clamp, S Searle
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */
package jalview.gui;

import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

import org.apache.log4j.SimpleLayout;

/**
 * Simple Jalview Java Console. Version 1 - allows viewing of console output after desktop is created.
 * Acquired with thanks from RJHM's site http://www.comweb.nl/java/Console/Console.html
 *  A simple Java Console for your application (Swing version)
 * Requires Java 1.1.5 or higher
 * Disclaimer the use of this source is at your own risk. 
 * Permision to use and distribute into your own applications
 * RJHM van den Bergh , rvdb@comweb.nl
 */

public class Console extends WindowAdapter implements WindowListener,
        ActionListener, Runnable
{
  private JFrame frame;

  private JTextArea textArea;

  private Thread reader;

  private Thread reader2;

  private boolean quit;

  private final PipedInputStream pin = new PipedInputStream();

  private final PipedInputStream pin2 = new PipedInputStream();


  Thread errorThrower; // just for testing (Throws an Exception at this Console
  // are we attached to some parent Desktop
  Desktop parent = null;
  public Console()
  {
    // create all components and add them
    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
    frame = initFrame("Java Console", screenSize.width / 2,
            screenSize.height / 2, -1, -1);
    initConsole(true);
  }

  private void initConsole(boolean visible)
  {
    // CutAndPasteTransfer cpt = new CutAndPasteTransfer();
    //textArea = cpt.getTextArea();
    textArea = new JTextArea();
    textArea.setEditable(false);
    JButton button = new JButton("clear");

    // frame = cpt;
    frame.getContentPane().setLayout(new BorderLayout());
    frame.getContentPane().add(new JScrollPane(textArea),
            BorderLayout.CENTER);
    frame.getContentPane().add(button, BorderLayout.SOUTH);
    frame.setVisible(visible);

    frame.addWindowListener(this);
    button.addActionListener(this);

    try
    {
      PipedOutputStream pout = new PipedOutputStream(this.pin);
      System.setOut(new PrintStream(pout, true));
    } catch (java.io.IOException io)
    {
      textArea.append("Couldn't redirect STDOUT to this console\n"
              + io.getMessage());
    } catch (SecurityException se)
    {
      textArea.append("Couldn't redirect STDOUT to this console\n"
              + se.getMessage());
    }

    try
    {
      PipedOutputStream pout2 = new PipedOutputStream(this.pin2);
      System.setErr(new PrintStream(pout2, true));
    } catch (java.io.IOException io)
    {
      textArea.append("Couldn't redirect STDERR to this console\n"
              + io.getMessage());
    } catch (SecurityException se)
    {
      textArea.append("Couldn't redirect STDERR to this console\n"
              + se.getMessage());
    }

    quit = false; // signals the Threads that they should exit

    // Starting two seperate threads to read from the PipedInputStreams
    //
    reader = new Thread(this);
    reader.setDaemon(true);
    reader.start();
    //
    reader2 = new Thread(this);
    reader2.setDaemon(true);
    reader2.start();
  }
  public void test() {
    // testing part
    // you may omit this part for your application
    // 
    
    System.out.println("Hello World 2");
    System.out.println("All fonts available to Graphic2D:\n");
    GraphicsEnvironment ge = GraphicsEnvironment
            .getLocalGraphicsEnvironment();
    String[] fontNames = ge.getAvailableFontFamilyNames();
    for (int n = 0; n < fontNames.length; n++)
      System.out.println(fontNames[n]);
    // Testing part: simple an error thrown anywhere in this JVM will be printed
    // on the Console
    // We do it with a seperate Thread becasue we don't wan't to break a Thread
    // used by the Console.
    System.out.println("\nLets throw an error on this console");
    errorThrower = new Thread(this);
    errorThrower.setDaemon(true);
    errorThrower.start();
  }

  private JFrame initFrame(String string, int i, int j, int x, int y)
  {
    JFrame frame = new JFrame(string);
    frame.setName(string);
    if (x==-1)
      x = (int) (i / 2);
    if (y==-1)
      y = (int) (j / 2);
    frame.setBounds(x, y, i, j);
    return frame;
  }

  /**
   * attach a console to the desktop - the desktop will open it if requested.
   * 
   * @param desktop
   */
  public Console(Desktop desktop)
  {
    parent = desktop;
    // window name - get x,y,width, height possibly scaled
    Rectangle bounds = desktop.getLastKnownDimensions("JAVA_CONSOLE_");
    if (bounds==null)
    {
    frame = initFrame("Jalview Java Console", desktop.getWidth() / 2,
            desktop.getHeight() / 4,desktop.getX(),desktop.getY());
    } else {
      frame = initFrame("Jalview Java Console", bounds.width, bounds.height, bounds.x, bounds.y);
    }
    // desktop.add(frame);
    initConsole(false);
    JalviewAppender jappender = new JalviewAppender();
    jappender.setLayout(new SimpleLayout());
    jappender.setTextArea(textArea);
    org.apache.log4j.Logger.getRootLogger().addAppender(jappender);
  }

  public synchronized void stopConsole()
  {
    quit = true;
    this.notifyAll(); // stop all threads
    try
    {
      reader.join(10);
      pin.close();
    } catch (Exception e)
    {
    }
    try
    {
      reader2.join(10);
      pin2.close();
    } catch (Exception e)
    {
    }
//    System.exit(0);
  }

  public synchronized void windowClosed(WindowEvent evt)
  {
    frame.setVisible(false);
    if (parent == null)
    {

      stopConsole();
    } else {
      parent.showConsole(false);
    }
  }

  public synchronized void windowClosing(WindowEvent evt)
  {
    frame.setVisible(false); // default behaviour of JFrame
//    frame.dispose();
  }

  public synchronized void actionPerformed(ActionEvent evt)
  {
    textArea.setText("");
  }

  public synchronized void run()
  {
    try
    {
      while (Thread.currentThread() == reader)
      {
        try
        {
          this.wait(100);
        } catch (InterruptedException ie)
        {
        }
        if (pin.available() != 0)
        {
          String input = this.readLine(pin);
          textArea.append(input);
        }
        if (quit)
          return;
      }

      while (Thread.currentThread() == reader2)
      {
        try
        {
          this.wait(100);
        } catch (InterruptedException ie)
        {
        }
        if (pin2.available() != 0)
        {
          String input = this.readLine(pin2);
          textArea.append(input);
        }
        if (quit)
          return;
      }
    } catch (Exception e)
    {
      textArea.append("\nConsole reports an Internal error.");
      textArea.append("The error is: " + e);
    }

    // just for testing (Throw a Nullpointer after 1 second)
    if (Thread.currentThread() == errorThrower)
    {
      try
      {
        this.wait(1000);
      } catch (InterruptedException ie)
      {
      }
      throw new NullPointerException(
              "Application test: throwing an NullPointerException It should arrive at the console");
    }

  }

  public synchronized String readLine(PipedInputStream in)
          throws IOException
  {
    String input = "";
    do
    {
      int available = in.available();
      if (available == 0)
        break;
      byte b[] = new byte[available];
      in.read(b);
      input = input + new String(b, 0, b.length);
    } while (!input.endsWith("\n") && !input.endsWith("\r\n") && !quit);
    return input;
  }

  public static void main(String[] arg)
  {
    new Console().test(); // create console with not reference
    
  }

  public void setVisible(boolean selected)
  {
    frame.setVisible(selected);
    if (selected == true)
    {
      frame.toFront();
    }    
  }

  public Rectangle getBounds()
  {
    if (frame!=null)
    {
      return frame.getBounds();
    }
    return null;
  }
}