/*
 * Copyright 2004-2006, Thorbjørn Lindeijer <thorbjorn@lindeijer.nl>
 * Copyright 2004-2006, Adam Turk <aturk@biggeruniverse.com>
 *
 * This file is part of libtiled-java.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *    1. Redistributions of source code must retain the above copyright notice,
 *       this list of conditions and the following disclaimer.
 *
 *    2. Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 * EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package tiled.util;

import java.awt.Dimension;
import java.awt.image.BufferedImage;

/**
 * Cuts tiles from a tileset image according to a regular rectangular pattern.
 * Supports a variable spacing between tiles and a margin around them.
 */
public class BasicTileCutter implements TileCutter
{
    private int nextX, nextY;
    private BufferedImage image;
    private final int tileWidth;
    private final int tileHeight;
    private final int tileSpacing;
    private final int tileMargin;

    public BasicTileCutter(int tileWidth, int tileHeight, int tileSpacing,
                           int tileMargin)
    {
        this.tileWidth = tileWidth;
        this.tileHeight = tileHeight;
        this.tileSpacing = tileSpacing;
        this.tileMargin = tileMargin;

        reset();
    }

    public String getName() {
        return "Basic";
    }

    public void setImage(BufferedImage image) {
        this.image = image;
    }

    public BufferedImage getNextTile() {
        if (nextY + tileHeight + tileMargin <= image.getHeight()) {
            BufferedImage tile =
                image.getSubimage(nextX, nextY, tileWidth, tileHeight);
            nextX += tileWidth + tileSpacing;

            if (nextX + tileWidth + tileMargin > image.getWidth()) {
                nextX = tileMargin;
                nextY += tileHeight + tileSpacing;
            }

            return tile;
        }

        return null;
    }

    public void reset() {
        nextX = tileMargin;
        nextY = tileMargin;
    }

    public Dimension getTileDimensions() {
        return new Dimension(tileWidth, tileHeight);
    }

    /**
     * Returns the spacing between tile images.
     * @return the spacing between tile images.
     */
    public int getTileSpacing() {
        return tileSpacing;
    }

    /**
     * Returns the margin around the tile images.
     * @return the margin around the tile images.
     */
    public int getTileMargin() {
        return tileMargin;
    }

    /**
     * Returns the number of tiles per row in the tileset image.
     * @return the number of tiles per row in the tileset image.
     */
    public int getTilesPerRow() {
        return (image.getWidth() - 2 * tileMargin + tileSpacing) /
                (tileWidth + tileSpacing);
    }
}