/*
 * Copyright (C) 2012 Dr. John Lindsay <jlindsay@uoguelph.ca>
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */
package whitebox.utilities;

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

/**
 *
 * @author Dr. John Lindsay email: jlindsay@uoguelph.ca
 */
public class Console extends JPanel {
    PipedInputStream piOut;
    PipedInputStream piErr;
    PipedOutputStream poOut;
    PipedOutputStream poErr;
    public JTextArea textArea = new JTextArea();

    public Console() throws IOException {
        // Set up System.out
        piOut = new PipedInputStream();
        poOut = new PipedOutputStream(piOut);
        System.setOut(new PrintStream(poOut, true));

        // Set up System.err
        piErr = new PipedInputStream();
        poErr = new PipedOutputStream(piErr);
        System.setErr(new PrintStream(poErr, true));

        // Add a scrolling text area
        textArea.setEditable(false);
        textArea.setRows(20);
        textArea.setColumns(50);
        this.add(new JScrollPane(textArea), BorderLayout.CENTER);
        //pack();
        setVisible(true);
        
        startThreads();

//        // Create reader threads
//        new ReaderThread(piOut).start();
//        new ReaderThread(piErr).start();
    }
    
    private void startThreads() {
        // Create reader threads
        new ReaderThread(piOut).start();
        new ReaderThread(piErr).start();
    }

    class ReaderThread extends Thread {
        PipedInputStream pi;

        ReaderThread(PipedInputStream pi) {
            this.pi = pi;
        }

        @Override
        public void run() {
            final byte[] buf = new byte[1024];
            try {
                while (true) {
                    final int len = pi.read(buf);
                    if (len == -1) {
                        break;
                    }
                    SwingUtilities.invokeLater(new Runnable() {
                        @Override
                        public void run() {
                            textArea.append(new String(buf, 0, len));

                            // Make sure the last line is always visible
                            textArea.setCaretPosition(textArea.getDocument().getLength());

                            // Keep the text area down to a certain character size
                            int idealSize = 1000;
                            int maxExcess = 500;
                            int excess = textArea.getDocument().getLength() - idealSize;
                            if (excess >= maxExcess) {
                                textArea.replaceRange("", 0, excess);
                            }
                        }
                    });
                }
            } catch (IOException e) {
            }
        }
    }
}