/*******************************************************************************
 * Copyright 2011 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 com.badlogic.gdx.maps;

import com.badlogic.gdx.assets.AssetManager;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.TextureAtlas;
import com.badlogic.gdx.graphics.g2d.TextureRegion;
import com.badlogic.gdx.utils.ObjectMap;

/**
 * Resolves an image by a string, wrapper around a Map or AssetManager
 * to load maps either directly or via AssetManager.
 * @author mzechner
 *
 */
public interface ImageResolver {
	/**
	 * @param name
	 * @return the Texture for the given image name or null.
	 */
	public TextureRegion getImage(String name);
	
	public static class DirectImageResolver implements ImageResolver {
		private final ObjectMap<String, Texture> images;
		
		public DirectImageResolver(ObjectMap<String, Texture> images) {
			this.images = images;
		}

		@Override
		public TextureRegion getImage (String name) {
			return new TextureRegion(images.get(name));
		}
	}
	
	public static class AssetManagerImageResolver implements ImageResolver {
		private final AssetManager assetManager;
		
		public AssetManagerImageResolver(AssetManager assetManager) {
			this.assetManager = assetManager;
		}
		
		@Override
		public TextureRegion getImage (String name) {
			return new TextureRegion(assetManager.get(name, Texture.class));
		}
	}
	
	public static class TextureAtlasImageResolver implements ImageResolver {
		private final TextureAtlas atlas;
		
		public TextureAtlasImageResolver(TextureAtlas atlas) {
			this.atlas = atlas;
		}
		
		@Override
		public TextureRegion getImage (String name) {
			return atlas.findRegion(name);
		}
	}
}