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/*******************************************************************************
 * Copyright 2019 See AUTHORS file
 *
 * 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.mini2Dx.tiled.collisions.merger;

import org.mini2Dx.tiled.Tile;
import org.mini2Dx.tiled.TileLayer;
import org.mini2Dx.tiled.TiledMap;
import org.mini2Dx.tiled.collisions.TiledCollisionMerger;

/**
 * An implementation of {@link TiledCollisionMerger} that merges tiles if they
 * have the same value for a certain property (or both have no value for the
 * property)
 */
public class TilePropertyCollisionMerger implements TiledCollisionMerger {
	private final String propertyName;

	public TilePropertyCollisionMerger(String propertyName) {
		super();
		this.propertyName = propertyName;
	}

	@Override
	public boolean isMergable(TiledMap tiledMap, TileLayer layer, Tile tile1, int tile1X, int tile1Y, int tile2X, int tile2Y) {
		final Tile tile2 = tiledMap.getTile(layer.getTileId(tile2X, tile2Y));
		if(tile1.containsProperty(propertyName)) {
			if(tile2.containsProperty(propertyName)) {
				return tile1.getProperty(propertyName).equals(tile2.getProperty(propertyName));
			}
		} else if(!tile2.containsProperty(propertyName)) {
			return true;
		}
		return false;
	}

}