/*******************************************************************************
 * Copyright 2010 Simon Mieth
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/

package org.kabeja.processing;

import java.util.Iterator;
import java.util.Map;

import org.kabeja.DraftDocument;
import org.kabeja.common.Layer;
import org.kabeja.common.Type;
import org.kabeja.entities.Entity;
import org.kabeja.math.Bounds;

public class BoundsFilter extends AbstractPostProcessor {
	public final static String PROPERTY_X = "boundsfilter.x";
	public final static String PROPERTY_Y = "boundsfilter.y";
	public final static String PROPERTY_WIDTH = "boundsfilter.width";
	public final static String PROPERTY_HEIGHT = "boundsfilter.height";
	public final static String PROPERTY_PROCESS = "boundsfilter.process";

	public void process(DraftDocument doc, Map context)
			throws ProcessorException {
		if (this.properties.containsKey(PROPERTY_PROCESS)
				&& Boolean.valueOf(
						(String) this.properties.get(PROPERTY_PROCESS))
						.booleanValue()) {
			Bounds bounds = new Bounds();

			if (this.properties.containsKey(PROPERTY_X)) {
				bounds.setMinimumX(Double.parseDouble((String) this.properties
						.get(PROPERTY_X)));
			}

			if (this.properties.containsKey(PROPERTY_Y)) {
				bounds.setMinimumY(Double.parseDouble((String) this.properties
						.get(PROPERTY_Y)));
			}

			if (this.properties.containsKey(PROPERTY_WIDTH)) {
				bounds.setMaximumX(bounds.getMinimumX()
						+ Double.parseDouble((String) this.properties
								.get(PROPERTY_WIDTH)));
			}

			if (this.properties.containsKey(PROPERTY_WIDTH)) {
				bounds.setMaximumY(bounds.getMinimumY()
						+ Double.parseDouble((String) this.properties
								.get(PROPERTY_HEIGHT)));
			}

			// the bounds should be setup now
			// we remove all entities which are
			// not inside our bounds
			for (Layer layer : doc.getLayers()) {
				filterLayer(layer, bounds);
			}
		}
	}

	protected void filterLayer(Layer layer, Bounds bounds) {
		for (Type<?> type : layer.getEntityTypes()) {
			Iterator<?> entities = layer.getEntitiesByType(type).iterator();

			while (entities.hasNext()) {
				Entity entity = (Entity) entities.next();

				if (!bounds.enclose(entity.getBounds())) {
					// the bounds not contains this entity
					// we remove it
					entities.remove();
				}
			}
		}
	}
}