/* -*- mode: java; c-basic-offset: 2; indent-tabs-mode: nil -*- */

/*
  Part of the Processing project - http://processing.org

  Copyright (c) 2012 The Processing Foundation

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License version 2
  as published by the Free Software Foundation.

  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

package processing.app;

import java.awt.Dimension;
import java.awt.Frame;
import java.awt.Image;
import java.awt.datatransfer.Clipboard;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.io.File;
import java.util.ArrayList;

import javax.swing.ImageIcon;
import javax.swing.JCheckBoxMenuItem;
import javax.swing.JComponent;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JRootPane;
import javax.swing.KeyStroke;


/**
 * Utility functions for base that require a java.awt.Toolkit object. These
 * are broken out from Base as we start moving toward the possibility of the
 * code running in headless mode.
 * @author fry
 */
public class Toolkit {
  static final java.awt.Toolkit awtToolkit =
    java.awt.Toolkit.getDefaultToolkit();

  /** Command on Mac OS X, Ctrl on Windows and Linux */
  static final int SHORTCUT_KEY_MASK =
    awtToolkit.getMenuShortcutKeyMask();
  /** Command-W on Mac OS X, Ctrl-W on Windows and Linux */
  public static final KeyStroke WINDOW_CLOSE_KEYSTROKE =
    KeyStroke.getKeyStroke('W', SHORTCUT_KEY_MASK);
  /** Command-Option on Mac OS X, Ctrl-Alt on Windows and Linux */
  static final int SHORTCUT_ALT_KEY_MASK = ActionEvent.ALT_MASK |
    awtToolkit.getMenuShortcutKeyMask();


  /**
   * A software engineer, somewhere, needs to have his abstraction
   * taken away. In some countries they jail or beat people for crafting
   * the sort of API that would require a five line helper function
   * just to set the shortcut key for a menu item.
   */
  static public JMenuItem newJMenuItem(String title, int what) {
    JMenuItem menuItem = new JMenuItem(title);
    int modifiers = awtToolkit.getMenuShortcutKeyMask();
    menuItem.setAccelerator(KeyStroke.getKeyStroke(what, modifiers));
    return menuItem;
  }


  /**
   * Like newJMenuItem() but adds shift as a modifier for the shortcut.
   */
  static public JMenuItem newJMenuItemShift(String title, int what) {
    JMenuItem menuItem = new JMenuItem(title);
    int modifiers = awtToolkit.getMenuShortcutKeyMask();
    modifiers |= ActionEvent.SHIFT_MASK;
    menuItem.setAccelerator(KeyStroke.getKeyStroke(what, modifiers));
    return menuItem;
  }


  /**
   * Same as newJMenuItem(), but adds the ALT (on Linux and Windows)
   * or OPTION (on Mac OS X) key as a modifier.
   */
  static public JMenuItem newJMenuItemAlt(String title, int what) {
    JMenuItem menuItem = new JMenuItem(title);
    menuItem.setAccelerator(KeyStroke.getKeyStroke(what, SHORTCUT_ALT_KEY_MASK));
    return menuItem;
  }


  static public JCheckBoxMenuItem newJCheckBoxMenuItem(String title, int what) {
    JCheckBoxMenuItem menuItem = new JCheckBoxMenuItem(title);
    int modifiers = awtToolkit.getMenuShortcutKeyMask();
    menuItem.setAccelerator(KeyStroke.getKeyStroke(what, modifiers));
    return menuItem;
  }


  static public void addDisabledItem(JMenu menu, String title) {
    JMenuItem item = new JMenuItem(title);
    item.setEnabled(false);
    menu.add(item);
  }


  // . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .


  static public Dimension getScreenSize() {
    return awtToolkit.getScreenSize();
  }


  /**
   * Return an Image object from inside the Processing lib folder.
   * Moved here so that Base can stay headless.
   */
  static public Image getLibImage(String filename) {
    File file = Base.getContentFile("lib/" + filename);
    if (!file.exists()) {
      return null;
    }
    return new ImageIcon(file.getAbsolutePath()).getImage();
  }


  static ArrayList<Image> iconImages;

  /**
   * Give this Frame the Processing icon set. Ignored on OS X, because they
   * thought different and made this function set the minified image of the
   * window, not the window icon for the dock or cmd-tab.
   */
  static public void setIcon(Frame frame) {
    if (!Base.isMacOS()) {
//    // too low-res, prepping for nicer icons in 2.0 timeframe
//    Image image = awtToolkit.createImage(PApplet.ICON_IMAGE);
//    frame.setIconImage(image);

      if (iconImages == null) {
        iconImages = new ArrayList<Image>();
        final int[] sizes = { 16, 32, 48, 64, 128, 256, 512 };
        for (int sz : sizes) {
          iconImages.add(Toolkit.getLibImage("icons/pde-" + sz + ".png"));
        }
      }
      frame.setIconImages(iconImages);
    }
  }


  // someone needs to be slapped
  //static KeyStroke closeWindowKeyStroke;

  /**
   * Return true if the key event was a Ctrl-W or an ESC,
   * both indicators to close the window.
   * Use as part of a keyPressed() event handler for frames.
   */
  /*
  static public boolean isCloseWindowEvent(KeyEvent e) {
    if (closeWindowKeyStroke == null) {
      int modifiers = Toolkit.getDefaultToolkit().getMenuShortcutKeyMask();
      closeWindowKeyStroke = KeyStroke.getKeyStroke('W', modifiers);
    }
    return ((e.getKeyCode() == KeyEvent.VK_ESCAPE) ||
            KeyStroke.getKeyStrokeForEvent(e).equals(closeWindowKeyStroke));
  }
  */

  /**
   * Registers key events for a Ctrl-W and ESC with an ActionListener
   * that will take care of disposing the window.
   */
  static public void registerWindowCloseKeys(JRootPane root,
                                             ActionListener disposer) {
    KeyStroke stroke = KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, 0);
    root.registerKeyboardAction(disposer, stroke,
                                JComponent.WHEN_IN_FOCUSED_WINDOW);

    int modifiers = awtToolkit.getMenuShortcutKeyMask();
    stroke = KeyStroke.getKeyStroke('W', modifiers);
    root.registerKeyboardAction(disposer, stroke,
                                JComponent.WHEN_IN_FOCUSED_WINDOW);
  }


  // . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .


  static public void beep() {
    awtToolkit.beep();
  }


  static public Clipboard getSystemClipboard() {
    return awtToolkit.getSystemClipboard();
  }


  static Boolean retinaProp;

  static public boolean highResDisplay() {
    if (Base.isMacOS()) {
      // This should probably be reset each time there's a display change.
      // A 5-minute search didn't turn up any such event in the Java API.
      // Also, should we use the Toolkit associated with the editor window?
      if (retinaProp == null) {
        Float prop = (Float)
          awtToolkit.getDesktopProperty("apple.awt.contentScaleFactor");
        if (prop != null) {
          retinaProp = prop == 2;
        } else {
          retinaProp = false;
        }
      }
      return retinaProp;
    }
    return false;
  }
}
