/*
 * FindBugs - Find bugs in Java programs
 * Copyright (C) 2004,2005 Rohan Lloyd <findbugs@rohanl.com>
 * Copyright (C) 2004,2005 University of Maryland
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/*
 * AnnotatedString.java
 *
 * Created on September 14, 2004
 */

package edu.umd.cs.findbugs.gui;

import java.awt.FlowLayout;
import java.awt.event.KeyEvent;

import javax.swing.JButton;
import javax.swing.JFrame;

import edu.umd.cs.findbugs.SystemProperties;

/**
 * Class to handle Strings annotated with embedded mnemonics
 *
 * Note: Since the human interface guidelines for Mac OS X say never
 * to use mnemonics, this class behaves as if no mnemonics are set
 * when run on Mac OS X.
 */
public class AnnotatedString {

	private static final boolean MAC_OS_X =
		SystemProperties.getProperty("os.name").toLowerCase().startsWith("mac os x");

	private final String myAnnotatedString;

	public AnnotatedString(String s) {
		myAnnotatedString = s;
	}

	/*
	 * Return the string minus any annotation
	 */
	@Override
	public String toString() {
		if (MAC_OS_X) {
			// Support annotations like "File(&F)"
			if (myAnnotatedString.matches("[^&]+\\(&\\p{Alnum}\\)")) {
				int endIndex = myAnnotatedString.length() - "(&X)".length();

				return myAnnotatedString.substring(0, endIndex);
			}

			// Support annotations like "File(&F)..."
			if (myAnnotatedString.matches("[^&]+\\(&\\p{Alnum}\\)\\.\\.\\.")) {
				int startIndex = myAnnotatedString.length() - "(&X)...".length();
				int endIndex = startIndex + "(&X)".length();

				return new StringBuilder(myAnnotatedString).delete(startIndex, endIndex).toString();
			}
		}
		return myAnnotatedString.replaceFirst("&", "");
	}

	/**
	 * Return the appropriate mnemonic character for this string. If no mnemonic
	 * should be displayed, KeyEvent.VK_UNDEFINED is returned.
	 *
	 * @return the Mnemonic character, or VK_UNDEFINED if no mnemonic should
	 *         be set
	 */
	public int getMnemonic() {
		int mnemonic = KeyEvent.VK_UNDEFINED;
		if (!MAC_OS_X) {
			int index = getMnemonicIndex();
			if ((index >= 0) && ((index + 1) < myAnnotatedString.length())) {
				mnemonic = Character.toUpperCase(myAnnotatedString.charAt(index + 1));
			}
		}
		return mnemonic;
	}

	/**
	 * @return the index in the plain string at which the mnemonic should be
	 *         displayed, or -1 if no mnemonic should be set
	 */
	public int getMnemonicIndex() {
		int index = -1;
		if (!MAC_OS_X) {
			index = myAnnotatedString.indexOf('&');
			if (index + 1 >= myAnnotatedString.length()) {
				index = -1;
			}
		}
		return index;
	}


	/*
	 * Some test code
	 */	
	private static void addButton(JFrame frame, String s) {
		AnnotatedString as = new AnnotatedString(s);
		JButton button = new JButton(as.toString());
		button.setMnemonic(as.getMnemonic());
		button.setDisplayedMnemonicIndex(as.getMnemonicIndex());
		frame.getContentPane().add(button);

		System.out.println("\"" + s + "\" \"" + as + "\" '" +
		as.getMnemonic() + "' " + as.getMnemonicIndex());
	}

	public static void main(String[] args) {
	// Some basic tests

		JFrame frame = new JFrame();
		frame.getContentPane().setLayout(new FlowLayout());

		addButton(frame, "&File");
		addButton(frame, "S&ave As...");
		addButton(frame, "Save &As...");
		addButton(frame, "Fo&o");
		addButton(frame, "Foo");

		// Error cases - make sure we handle them sensibly
		addButton(frame, "");
		addButton(frame, "&");
		addButton(frame, "Foo&");
		addButton(frame, "Cat & Dog");
		addButton(frame, "Cat && Dog");

		frame.pack();
		frame.setVisible(true);
	}

}
