/*
 * Bibliothek - DockingFrames
 * Library built on Java/Swing, allows the user to "drag and drop"
 * panels containing any Swing-Component the developer likes to add.
 * 
 * Copyright (C) 2015 Benjamin Sigg
 * 
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * Benjamin Sigg
 * benjamin_sigg@gmx.ch
 * CH - Switzerland
 */
package bibliothek.gui.dock.station.split;

import java.util.ArrayList;
import java.util.List;

import bibliothek.gui.Dockable;
import bibliothek.gui.dock.SplitDockStation;
import bibliothek.gui.dock.layout.DockableProperty;
import bibliothek.gui.dock.station.PlaceholderMapping;
import bibliothek.util.Path;

/**
 * A {@link PlaceholderMapping} representing the placeholders on a {@link SplitDockStation}.
 * @author Benjamin Sigg
 */
public class SplitDockPlaceholderMapping implements PlaceholderMapping{
	/** the owner and creator of this mapping */
	private SplitDockStation station;
	
	/**
	 * Creates a new mapping for <code>station</code>. Clients should not call this method, instead they
	 * should call {@link SplitDockStation#getPlaceholderMapping()}.
	 * @param station the source of the mapping
	 */
	public SplitDockPlaceholderMapping( SplitDockStation station ){
		this.station = station;
	}
	
	public SplitDockStation getStation() {
		return station;
	}
	
	public void addPlaceholder( Dockable dockable, Path placeholder ) {
		if( dockable == null )
			throw new IllegalArgumentException( "dockable must not be null" );
		
		if( placeholder == null )
			throw new IllegalArgumentException( "placeholder must not be null" );
		
		Leaf leaf = station.getRoot().getLeaf( dockable );
		if( leaf == null ){
			throw new IllegalArgumentException( "unable to find location of dockable" );
		}
		removePlaceholder( leaf, placeholder );
		leaf.addPlaceholder( placeholder );
	}
	
	public void removePlaceholder( Path placeholder ) {
		removePlaceholder( null, placeholder );
	}
	
	private void removePlaceholder( final Leaf ignore, final Path placeholder ) {
		final List<Placeholder> nodesToRemove = new ArrayList<Placeholder>();
		
		station.getRoot().visit( new SplitNodeAdapter() {
			@Override
			public void handlePlaceholder( Placeholder node ) {
				node.removePlaceholder( placeholder );
				if( !node.isOfUse() ){
					nodesToRemove.add( node );
				}
			}
			
			@Override
			protected void handle( SplitNode node ) {
				if( node != ignore ){
					node.removePlaceholder( placeholder );
				}
			}
		});
		
		for( Placeholder node : nodesToRemove ){
			node.delete( true );
		}
	}
	
	public Dockable getDockableAt( Path placeholder ) {
		FindDockable finder = new FindDockable( placeholder );
		station.getRoot().visit( finder );
		return finder.getResult();
	}
	
	private static class FindDockable extends SplitNodeAdapter{
		private Path placeholder;
		private Dockable result;
		
		public FindDockable( Path placeholder ){
			this.placeholder = placeholder;
		}
		
		@Override
		public void handleLeaf( Leaf leaf ) {
			if( leaf.hasPlaceholder( placeholder )){
				result = leaf.getDockable();
			}
		}
		
		public Dockable getResult() {
			return result;
		}
	}
	
	public DockableProperty getLocationAt( Path placeholder ) {
		SplitDockPathProperty path = station.getDockablePathProperty( placeholder );
		return new SplitDockPlaceholderProperty( placeholder, path );
	}
	
	public boolean hasPlaceholder( Path placeholder ) {
		HasPlaceholderFinder finder = new HasPlaceholderFinder( placeholder );
		station.getRoot().visit( finder );
		return finder.isFound();
	}
	
	private static class HasPlaceholderFinder extends SplitNodeAdapter{
		private Path placeholder;
		private boolean found;
		
		public HasPlaceholderFinder( Path placeholder ){
			this.placeholder = placeholder;
		}
		
		@Override
		protected void handle( SplitNode node ) {
			if( node.hasPlaceholder( placeholder )){
				found = true;
			}
		}
		
		public boolean isFound() {
			return found;
		}
	}
}