/*
 * Copyright (c) 2001-2007 JGoodies Karsten Lentzsch. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 * 
 *  o Redistributions of source code must retain the above copyright notice, 
 *    this list of conditions and the following disclaimer. 
 *     
 *  o Redistributions in binary form must reproduce the above copyright notice, 
 *    this list of conditions and the following disclaimer in the documentation 
 *    and/or other materials provided with the distribution. 
 *     
 *  o Neither the name of JGoodies Karsten Lentzsch nor the names of 
 *    its contributors may be used to endorse or promote products derived 
 *    from this software without specific prior written permission. 
 *     
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

package com.jgoodies.looks;

import java.awt.Font;

import javax.swing.plaf.FontUIResource;


/**
 * Provides predefined FontSet implementations.
 *
 * @author  Karsten Lentzsch
 * @version $Revision: 1.11 $
 * 
 * @see     FontSet
 * @see     FontPolicy
 * @see     FontPolicies
 * 
 * @since 2.0
 */ 
public final class FontSets {
    
    private static FontSet logicalFontSet;


    private FontSets() {
        // Override default constructor; prevents instantation.
    }
    
    
    // Default FontSets *******************************************************
    
    /**
     * Creates and returns a FontSet that is based only 
     * on the given control font. The small font will be
     * derived from the control font; all other fonts 
     * returned are the control font.
     * 
     * @param controlFont   the font used for all controls
     * 
     * @return a FontSet based on the given fonts
     * 
     * @throws NullPointerException  if the control font is <code>null</code>
     */
    public static FontSet createDefaultFontSet(Font controlFont) {
        return createDefaultFontSet(controlFont, null);
    }

    
    /**
     * Creates and returns a FontSet that is based on the given control font
     * and menu font. The small font will be derived from the control font; 
     * all other fonts return, except the menu font, are the control font.
     * 
     * @param controlFont   the font used for all controls
     * @param menuFont      the font used for the menu bar and menu items
     * 
     * @return a FontSet based on the given fonts
     * 
     * @throws NullPointerException  if the control font is <code>null</code>
     */
    public static FontSet createDefaultFontSet(Font controlFont, Font menuFont) {
        return createDefaultFontSet(controlFont, menuFont, null, null, null, null);
    }
    
    
    /**
     * Creates and returns a FontSet that is based on the given control font
     * and menu font. The small font will be derived from the control font; 
     * all other fonts return, except the menu font, are the control font.
     * 
     * @param controlFont   the font used for all controls
     * @param menuFont      the font used for the menu bar and menu items
     * @param titleFont     used for TitledBorder, titles and titled separators
     * 
     * @return a FontSet based on the given fonts
     * 
     * @throws NullPointerException  if the control font is <code>null</code>
     */
    public static FontSet createDefaultFontSet(Font controlFont, Font menuFont, Font titleFont) {
        return createDefaultFontSet(controlFont, menuFont, titleFont, null, null, null);
    }
    
    
    /**
     * Creates and returns a FontSet for the given fonts.
     * If a font is <code>null</code>, it uses the control font as
     * fallback. If the small font is <code>null</code> it will 
     * be derived from the control font.
     * 
     * @param controlFont      used for all controls
     * @param menuFont         used for the menu bar and menu items
     * @param titleFont        used for TitledBorder, titles and titled separators
     * @param messageFont      used for OptionPanes
     * @param smallFont        used for tool tips and similar components 
     * @param windowTitleFont  used for internal frame window titles
     * 
     * @return a FontSet based on the given fonts
     * 
     * @throws NullPointerException  if the control font is <code>null</code>
     */
    public static FontSet createDefaultFontSet(
            Font controlFont, 
            Font menuFont,
            Font titleFont, 
            Font messageFont, 
            Font smallFont, 
            Font windowTitleFont) {
        return new DefaultFontSet(controlFont, menuFont, titleFont, messageFont, smallFont, windowTitleFont);
    }
    
    
    // Logical FontSet ********************************************************
    
    /**
     * Lazily creates and returns the FontSet that returns 
     * the logical fonts specified by the Java runtime environment.
     * 
     * @return a FontSets that uses the logical fonts specified
     *     by the Java environment
     */
    public static FontSet getLogicalFontSet() {
        if (logicalFontSet == null) {
            logicalFontSet = new LogicalFontSet();
        }
        return logicalFontSet;
    }
    
    
    // Helper Code ************************************************************
    
    private static final class DefaultFontSet implements FontSet {
        
        private final FontUIResource controlFont;
        private final FontUIResource menuFont;
        private final FontUIResource titleFont;
        private final FontUIResource messageFont;
        private final FontUIResource smallFont;
        private final FontUIResource windowTitleFont;
        
        
        // Instance Creation --------------------------------------------------
        
        /**
         * Constructs a DefaultFontSet for the given fonts.
         * If a font is <code>null</code>, it uses the control font as
         * fallback. If the small font is <code>null</code> it will 
         * be derived from the control font.
         * 
         * @param controlFont      used for all controls
         * @param menuFont         used for the menu bar and menu items
         * @param titleFont        used for TitledBorder, titles and titled separators
         * @param messageFont      used for OptionPanes
         * @param smallFont        used for tool tips and similar components 
         * @param windowTitleFont  used for internal frame window titles
         * 
         * @throws NullPointerException  if the control font is <code>null</code>
         */
        public DefaultFontSet(
                Font controlFont, 
                Font menuFont,
                Font titleFont, 
                Font messageFont, 
                Font smallFont, 
                Font windowTitleFont) {
            this.controlFont = new FontUIResource(controlFont);
            this.menuFont = menuFont != null
                ? new FontUIResource(menuFont)
                : this.controlFont;
            this.titleFont = titleFont != null
                ? new FontUIResource(titleFont)
                : this.controlFont; //new FontUIResource(controlFont.deriveFont(Font.BOLD))
            this.messageFont = messageFont != null
                ? new FontUIResource(messageFont)
                : this.controlFont;
            this.smallFont = new FontUIResource(smallFont != null
                ? smallFont
                : controlFont.deriveFont(controlFont.getSize2D() - 2f));
            this.windowTitleFont = windowTitleFont != null
                ? new FontUIResource(windowTitleFont)
                : this.titleFont;
        }
        
        
        // FontSet API --------------------------------------------------------
        
        public FontUIResource getControlFont() {
            return controlFont;
        }
        
        public FontUIResource getMenuFont() {
            return menuFont;
        }
        
        public FontUIResource getTitleFont() {
            return titleFont;
        }

        public FontUIResource getWindowTitleFont() {
            return windowTitleFont;
        }
        
        public FontUIResource getSmallFont() {
            return smallFont;
        }
        
        public FontUIResource getMessageFont() {
            return messageFont;
        }

    }
    
    
    /**
     * Looks up and returns the logical fonts as specified
     * by the Java runtime environment.
     */
    private static final class LogicalFontSet implements FontSet {

        private FontUIResource controlFont;
        private FontUIResource titleFont;
        private FontUIResource systemFont;
        private FontUIResource smallFont;


        public FontUIResource getControlFont() {
            if (controlFont == null) {
                controlFont = new FontUIResource(
                        Font.getFont(
                            "swing.plaf.metal.controlFont",
                            new Font("Dialog", Font.PLAIN, 12)));
                
            }
            return controlFont;
        }
        
        public FontUIResource getMenuFont() {
            return getControlFont();
        }
        
        public FontUIResource getTitleFont() {
            if (titleFont == null) {
                titleFont =
                    new FontUIResource(
                        getControlFont().deriveFont(Font.BOLD));
            }
            return titleFont;
        }

        public FontUIResource getSmallFont() {
            if (smallFont == null) {
                smallFont =
                    new FontUIResource(
                        Font.getFont(
                            "swing.plaf.metal.smallFont",
                            new Font("Dialog", Font.PLAIN, 10)));
            }
            return smallFont;
        }

        public FontUIResource getMessageFont() {
            if (systemFont == null) {
                systemFont =
                    new FontUIResource(
                        Font.getFont(
                            "swing.plaf.metal.systemFont",
                            new Font("Dialog", Font.PLAIN, 12)));
            }
            return systemFont;
        }

        public FontUIResource getWindowTitleFont() {
            return getTitleFont();
        }
        

    }    
    
    
}
