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/*******************************************************************************
 * 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.tiledmappacker;

import java.awt.image.BufferedImage;
import java.io.IOException;

import javax.imageio.ImageIO;

import com.badlogic.gdx.files.FileHandle;
import com.badlogic.gdx.maps.tiled.TiledMapTileSet;
import com.badlogic.gdx.math.Vector2;
import com.badlogic.gdx.utils.IntMap;

/** Contains extra information that can only be calculated after a Tiled Map's tile set images are loaded.
 * @author David Fraska */
public class TileSetLayout {

	public final BufferedImage image;
	private final IntMap imageTilePositions;
	private int numRows;
	private int numCols;
	public final int numTiles;
	public final int firstgid;

	/** Constructs a Tile Set layout. The tile set image contained in the baseDir should be the original tile set images before
	 * being processed by {@link TiledMapPacker} (the ones actually read by Tiled).
	 * @param tileset the tile set to process
	 * @param baseDir the directory in which the tile set image is stored */
	protected TileSetLayout (int firstgid, TiledMapTileSet tileset, FileHandle baseDir) throws IOException {
		int tileWidth = tileset.getProperties().get("tilewidth", Integer.class);
		int tileHeight = tileset.getProperties().get("tileheight", Integer.class);
		int margin = tileset.getProperties().get("margin", Integer.class);
		int spacing = tileset.getProperties().get("spacing", Integer.class);

		this.firstgid = firstgid;

		image = ImageIO.read(baseDir.child(tileset.getProperties().get("imagesource", String.class)).read());

		imageTilePositions = new IntMap();

		// fill the tile regions
		int x, y, tile = 0;
		numRows = 0;
		numCols = 0;

		int stopWidth = image.getWidth() - tileWidth;
		int stopHeight = image.getHeight() - tileHeight;

		for (y = margin; y <= stopHeight; y += tileHeight + spacing) {
			for (x = margin; x <= stopWidth; x += tileWidth + spacing) {
				if (y == margin) numCols++;
				imageTilePositions.put(tile, new Vector2(x, y));
				tile++;
			}
			numRows++;
		}

		numTiles = numRows * numCols;
	}

	public int getNumRows () {
		return numRows;
	}

	public int getNumCols () {
		return numCols;
	}

	/** Returns the location of the tile in {@link TileSetLayout#image} */
	public Vector2 getLocation (int tile) {
		return imageTilePositions.get(tile - firstgid);
	}
}