/* ========================================================================
 * PlantUML : a free UML diagram generator
 * ========================================================================
 *
 * (C) Copyright 2009-2020, Arnaud Roques
 *
 * Project Info:  http://plantuml.com
 * 
 * If you like this project or if you find it useful, you can support us at:
 * 
 * http://plantuml.com/patreon (only 1$ per month!)
 * http://plantuml.com/paypal
 * 
 * This file is part of PlantUML.
 *
 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * PlantUML distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
 * License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 *
 *
 * Original Author:  Arnaud Roques
 * 
 *
 */
package net.sourceforge.plantuml.ugraphic.sprite;

import java.awt.Color;
import java.awt.image.BufferedImage;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class SpriteColorBuilder {

	private final static ColorPalette COLOR_PALETTE = new ColorPalette();

	public static Sprite buildSprite(List<CharSequence> strings) {
		final SpriteColor result = new SpriteColor(strings.get(0).length(), strings.size());
		for (int col = 0; col < result.getWidth(); col++) {
			for (int line = 0; line < result.getHeight(); line++) {
				if (col >= strings.get(line).length()) {
					continue;
				}
				final char charColor = strings.get(line).charAt(col);
				final int idx = "0123456789ABCDEF".indexOf(charColor);
				if (idx != -1) {
					result.setGrey(col, line, idx);
				} else {
					final Color rgb = COLOR_PALETTE.getColorFor(charColor);
					result.setColor(col, line, rgb.getRGB() & 0xFFFFFF);
				}
			}
		}
		return result;
	}

	static public List<String> encodeColor(BufferedImage img) {
		final int width = img.getWidth();
		final int height = img.getHeight();

		final List<String> result = new ArrayList<String>();

		for (int y = 0; y < height; y++) {
			final StringBuilder sb = new StringBuilder();
			for (int x = 0; x < width; x++) {
				final int rgb = (img.getRGB(x, y) & 0xFFFFFF);
				final char code = COLOR_PALETTE.getCharFor(new Color(rgb));
				sb.append(code);
			}
			result.add(sb.toString());
		}
		return Collections.unmodifiableList(result);
	}

}
