/*
 * Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 David Berkman
 * 
 * This file is part of the SmallMind Code Project.
 * 
 * The SmallMind Code Project is free software, you can redistribute
 * it and/or modify it under either, at your discretion...
 * 
 * 1) The terms of GNU Affero General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at
 * your option) any later version.
 * 
 * ...or...
 * 
 * 2) The terms of the Apache License, Version 2.0.
 * 
 * The SmallMind Code Project 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 or Apache License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * and the Apache License along with the SmallMind Code Project. If not, see
 * <http://www.gnu.org/licenses/> or <http://www.apache.org/licenses/LICENSE-2.0>.
 * 
 * Additional permission under the GNU Affero GPL version 3 section 7
 * ------------------------------------------------------------------
 * If you modify this Program, or any covered work, by linking or
 * combining it with other code, such other code is not for that reason
 * alone subject to any of the requirements of the GNU Affero GPL
 * version 3.
 */
package org.smallmind.swing.button;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import javax.swing.JButton;
import javax.swing.SwingUtilities;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import org.smallmind.nutsnbolts.util.WeakEventListenerList;
import org.smallmind.scribe.pen.LoggerManager;

public class ButtonRepeater implements ChangeListener {

  private WeakEventListenerList<ActionListener> listenerList;
  private JButton button;
  private AutoPress autoPress;
  private boolean armed = false;
  private long delayMilliseconds;

  public ButtonRepeater (JButton button, long delayMilliseconds) {

    Thread autoThread;

    this.button = button;
    this.delayMilliseconds = delayMilliseconds;

    autoPress = new AutoPress();

    autoThread = new Thread(autoPress);
    autoThread.start();

    button.addChangeListener(this);

    listenerList = new WeakEventListenerList<ActionListener>();
  }

  public synchronized void addActionListener (ActionListener actionListener) {

    listenerList.addListener(actionListener);
  }

  public synchronized void removeActionListener (ActionListener actionListener) {

    listenerList.removeListener(actionListener);
  }

  public synchronized void stateChanged (ChangeEvent changeEvent) {

    if (!armed) {
      if (button.getModel().isPressed()) {
        armed = true;
        fireActionPereformed(new ActionEvent(button, 0, button.getActionCommand()));
      }
    }
    else if (!button.getModel().isPressed()) {
      armed = false;
    }
  }

  public void fireActionPereformed (ActionEvent actionEvent) {

    for (ActionListener actionListener : listenerList) {
      actionListener.actionPerformed(actionEvent);
    }
  }

  public void finalize () {

    try {
      autoPress.finish();
    }
    catch (InterruptedException interruptedException) {
      LoggerManager.getLogger(ButtonRepeater.class).error(interruptedException);
    }
  }

  private class DoClick implements Runnable {

    public void run () {

      fireActionPereformed(new ActionEvent(button, 0, button.getActionCommand()));
    }
  }

  private class AutoPress implements Runnable {

    private CountDownLatch exitLatch;
    private CountDownLatch pulseLatch;
    private AtomicBoolean finished = new AtomicBoolean(false);

    public AutoPress () {

      pulseLatch = new CountDownLatch(1);
      exitLatch = new CountDownLatch(1);
    }

    public void finish ()
      throws InterruptedException {

      if (finished.compareAndSet(false, true)) {
        pulseLatch.countDown();
      }

      exitLatch.await();
    }

    public void run () {

      try {
        while (!finished.get()) {
          try {
            if (!armed) {
              pulseLatch.await(100, TimeUnit.MILLISECONDS);
            }
            else {
              pulseLatch.await(delayMilliseconds, TimeUnit.MILLISECONDS);
              if (armed) {
                SwingUtilities.invokeLater(new DoClick());
              }
            }
          }
          catch (InterruptedException interruptedException) {
            LoggerManager.getLogger(ButtonRepeater.class).error(interruptedException);
          }
        }
      }
      finally {
        exitLatch.countDown();
      }
    }
  }
}