// License: GPL. Copyright 2007 by Immanuel Scholz and others
package org.openstreetmap.josm.command;

import static org.openstreetmap.josm.tools.I18n.tr;
import static org.openstreetmap.josm.tools.I18n.trn;

import java.util.Collection;
import java.util.LinkedList;
import java.util.List;

import javax.swing.JLabel;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.MutableTreeNode;

import org.openstreetmap.josm.data.osm.OsmPrimitive;
import org.openstreetmap.josm.data.osm.visitor.NameVisitor;
import org.openstreetmap.josm.tools.ImageProvider;

/**
 * Command that manipulate the key/value structure of several objects. Manages deletion,
 * adding and modify of values and keys.
 * 
 * @author imi
 */
public class ChangePropertyCommand extends Command {
	/**
	 * All primitives, that are affected with this command.
	 */
	private final List<OsmPrimitive> objects;
	/**
	 * The key that is subject to change.
	 */
	private final String key;
	/**
	 * The key value. If it is <code>null</code>, delete all key references with the given
	 * key. Else, change the properties of all objects to the given value or create keys of
	 * those objects that do not have the key yet.
	 */
	private final String value;
	
	public ChangePropertyCommand(Collection<OsmPrimitive> objects, String key, String value) {
		this.objects = new LinkedList<OsmPrimitive>(objects);
		this.key = key;
		this.value = value;
	}
	
	@Override public void executeCommand() {
		super.executeCommand(); // save old
		if (value == null) {
			for (OsmPrimitive osm : objects) {
				osm.modified = true;
				osm.remove(key);
			}
		} else {
			for (OsmPrimitive osm : objects) {
				osm.modified = true;
				osm.put(key, value);
			}
		}
	}

	@Override public void fillModifiedData(Collection<OsmPrimitive> modified, Collection<OsmPrimitive> deleted, Collection<OsmPrimitive> added) {
		modified.addAll(objects);
	}

	@Override public MutableTreeNode description() {
		String text = value == null ? tr( "Remove \"{0}\" for", key) : tr("Set {0}={1} for",key,value);
		if (objects.size() == 1) {
			NameVisitor v = new NameVisitor();
			objects.iterator().next().visit(v);
			text += " "+tr(v.className)+" "+v.name;
		} else
			text += " "+objects.size()+" "+trn("object","objects",objects.size());
		DefaultMutableTreeNode root = new DefaultMutableTreeNode(new JLabel(text, ImageProvider.get("data", "key"), JLabel.HORIZONTAL));
		if (objects.size() == 1)
			return root;
		NameVisitor v = new NameVisitor();
		for (OsmPrimitive osm : objects) {
			osm.visit(v);
			root.add(new DefaultMutableTreeNode(v.toLabel()));
		}
		return root;
    }
}