/*
 *                 Sun Public License Notice
 *
 * The contents of this file are subject to the Sun Public License
 * Version 1.0 (the "License"). You may not use this file except in
 * compliance with the License. A copy of the License is available at
 * http://www.sun.com/
 *
 * The Original Code is NetBeans, Community Edition. The Initial
 * Developer of the Original Code is Sun Microsystems, Inc. Portions
 * Copyright 1997-2002 Sun Microsystems, Inc. All Rights Reserved.
 */

package org.netbeans.spi.looks;

import javax.swing.Action;
import java.beans.BeanInfo;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.Enumeration;
import org.netbeans.modules.looks.RegistryBridge;

import org.openide.util.Utilities;
import org.openide.util.Lookup;

/**
 * Utility class for providing Looks. Some methods are linked together to
 * make it easier for subclasses to implement reasonable functionality
 * (iconBase, actionBase), etc.
 *
 * @author Jaroslav Tulach
 */
public abstract class DefaultLook extends Look {
    /** messages to create a resource identification for each type of
    * icon from the base name for the icon.
    */
    private static final MessageFormat[] icons = {
        // color 16x16
        new MessageFormat ("{0}.gif"), // NOI18N
        // color 32x32
        new MessageFormat ("{0}32.gif"), // NOI18N
        // mono 16x16
        new MessageFormat ("{0}.gif"), // NOI18N
        // mono 32x32
        new MessageFormat ("{0}32.gif"), // NOI18N
        // opened color 16x16
        new MessageFormat ("{0}Open.gif"), // NOI18N
        // opened color 32x32
        new MessageFormat ("{0}Open32.gif"), // NOI18N
        // opened mono 16x16
        new MessageFormat ("{0}Open.gif"), // NOI18N
        // opened mono 32x32
        new MessageFormat ("{0}Open32.gif"), // NOI18N
    };
    /** To index normal icon from previous array use
    *  + ICON_BASE.
    */
    private static final int ICON_BASE = -1;
    /** for indexing opened icons */
    private static final int OPENED_ICON_BASE = 3;

    private RegistryBridge registryBridge;
    
    /** Creates new instance of look does no work.
     * @param name the name to assign to the look
     */
    public DefaultLook(String name) {
        this( RegistryBridge.getDefault( null ), name );
    }
    
    DefaultLook(RegistryBridge registryBridge, String name) {
        super( name );
        this.registryBridge = registryBridge;
    }
    
    // Methods for STYLE -------------------------------------------------------

    /** Finds icon using the value returned from iconBase
     * @param representedObject Parameter is ignored.
     * @param type Icon type constant from {@link java.beans.BeanInfo}
     * @param env Parameter is ignored.
     * @return an icon or null if not found
     */
    public java.awt.Image getIcon(Object representedObject, int type, Lookup env ) {
        return findIcon ( representedObject, type, ICON_BASE, env);
    }

    /** Finds icon using the value returned from iconBase
     * @param representedObject Parameter is ignored.
     * @param type Icon type constant from {@link java.beans.BeanInfo}
     * @param env Parameter is ignored.
     * @return an icon or null if not found
     */
    public java.awt.Image getOpenedIcon(Object representedObject, int type, Lookup env ) {
        return findIcon ( representedObject, type, OPENED_ICON_BASE, env);
    }

    // Methods for ACTIONS & NEW TYPES -----------------------------------------

    /** Calls actionBase (substitute, false) and extracts actions
     * from that context.
     * @param representedObject Parameter is ignored.
     * @param env Parameter is ignored.
     * @return the actions at the context or null
     */
    public Action[] getActions(Object representedObject, Lookup env ) {
        return actionsForContext (registryBridge, actionBase (representedObject, false, env ));
    }

    /** Calls actionBase (substitute, true) and extracts actions
     * from that context.
     * @param representedObject Parameter is ignored.
     * @param env Parameter is ignored.
     * @return the actions at the context or null
     */
    public Action[] getContextActions(Object representedObject, Lookup env ) {
        return actionsForContext (registryBridge, actionBase (representedObject, true, env ));
    }

    /** Extracts the first action from getActions, if any.
     * @param representedObject Parameter is ignored.
     * @param env Parameter is ignored.
     * @return the action or null
     */
    public Action getDefaultAction(Object representedObject, Lookup env ) {
        Action[] arr = getActions (representedObject, env );
        return arr != null && arr.length > 0 ? arr[0] : null;
    }

    // Methods for PROPERTIES AND CUSTOMIZER -----------------------------------

    /** Check whether the customizer for the represented object is available.
     * I.e. whether
     * getCustomizer (substitute) returns non-null value
     * @param representedObject Parameter is ignored.
     * @param env Parameter is ignored.
     * @return true if the customizer is available, false otherwise
     */
    public boolean hasCustomizer(Object representedObject, Lookup env ) {
        return getCustomizer (representedObject, env ) != null;
    }


    // Icon management ---------------------------------------------------------

    /** Allows subclasses to specify an icon in easier way without need to
     * load the actual objects.
     *
     * 
For example, if the returned base is /resource/MyIcon, the
     * following images may be used according to the icon state and
     * {@link java.beans.BeanInfo#getIcon presentation type}:
     *
     * 
resource/MyIcon.gif
resource/MyIconOpen.gif
     * 
resource/MyIcon32.gif
resource/MyIconOpen32.gif
     *
     * 

     * The default implementation returns null.
     * @param representedObject The substitute to locate icon for.
     * @param env Environement of the object.
     * @return the base for icon search (no initial slash) or null if this look does not provide an icon
     */
    protected String iconBase ( Object representedObject, Lookup env ) {
        return null;
    }

    /** Allows subclasses to specify actions in a easy way - by providing a
    * name of a context name where to find the javax.swing.Action objects.
    *
    * 
By default the method returns name of this class (separated by slashes)
    * with a prefix Looks/Actions. So for a class org.nb.mymod.MyLook
    * the default action context is Looks/Actions/org/nb/mymod/MyLook.
    * As a result it is not necessary to override this method in many cases.
    *
    * @param representedObject The object to work on.
    * @param context false if getActions was called,
    *    true if getContextActions was called
    * @param env Environement for the object.
    * @return the name of a context
    */
    protected String actionBase ( Object representedObject, boolean context, Lookup env ) {
        return "Looks/Actions/" + getClass ().getName ().replace ('.', '/');  // NOI18N
    }

    // Private methods ---------------------------------------------------------

    /** Reads actions from a context.
     * @param name of the context.
     * @return array of actions
     */
    private static Action[] actionsForContext (RegistryBridge  registryBridge, String name) {        
        Enumeration en = registryBridge.getObjects(name, null);
        if (!en.hasMoreElements ()) {
            return null;
        }

        ArrayList arr = new ArrayList ();
        while (en.hasMoreElements()) {
            arr.add (en.nextElement ());
        }

        return (Action[])arr.toArray (new Action[arr.size ()]);        
    }

    /** Tries to find the right icon for the iconbase.
    * @param type type of icon (from BeanInfo constants)
    * @param ib base where to scan in the array
    * @return icon or null
    */
    private java.awt.Image findIcon ( Object representedObject, int type, int ib, Lookup env) {
        String[] base = { iconBase (representedObject, env ) };
        if (base[0] == null) {
            return null;
        }

        String res = icons[type + ib].format (base);
        java.awt.Image im = Utilities.loadImage (res);

        if (im != null) return im;

        // try the first icon
        res = icons[BeanInfo.ICON_COLOR_16x16 + ib].format (base);

        im = Utilities.loadImage (res);

        if (im != null) return im;

        if (ib == OPENED_ICON_BASE) {
            // try closed icon also
            return findIcon (representedObject, type, ICON_BASE, env);
        }

        // if still not found return default icon
        return null;
    }

}