/* ========================================================================
 * 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;

import java.awt.geom.Dimension2D;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;

import net.sourceforge.plantuml.core.Diagram;
import net.sourceforge.plantuml.creole.atom.Atom;
import net.sourceforge.plantuml.cucadiagram.Display;
import net.sourceforge.plantuml.graphic.AbstractTextBlock;
import net.sourceforge.plantuml.graphic.HorizontalAlignment;
import net.sourceforge.plantuml.graphic.Line;
import net.sourceforge.plantuml.graphic.StringBounder;
import net.sourceforge.plantuml.preproc.Defines;
import net.sourceforge.plantuml.security.ImageIO;
import net.sourceforge.plantuml.ugraphic.AffineTransformType;
import net.sourceforge.plantuml.ugraphic.PixelImage;
import net.sourceforge.plantuml.ugraphic.UGraphic;
import net.sourceforge.plantuml.ugraphic.UImage;
import net.sourceforge.plantuml.ugraphic.UImageSvg;
import net.sourceforge.plantuml.ugraphic.UShape;

public class EmbeddedDiagram implements CharSequence {

	public static String getEmbeddedType(CharSequence s) {
		if (s == null) {
			return null;
		}
		s = StringUtils.trin(s.toString());
		if (s.equals("{{")) {
			return "uml";
		}
		if (s.equals("{{uml")) {
			return "uml";
		}
		if (s.equals("{{wbs")) {
			return "wbs";
		}
		if (s.equals("{{mindmap")) {
			return "mindmap";
		}
		if (s.equals("{{gantt")) {
			return "gantt";
		}
		if (s.equals("{{json")) {
			return "json";
		}
		if (s.equals("{{yaml")) {
			return "yaml";
		}
		if (s.equals("{{wire")) {
			return "wire";
		}
		return null;
	}

	private final Display system;

	public EmbeddedDiagram(Display system) {
		this.system = system;
	}

	public int length() {
		return toString().length();
	}

	public char charAt(int index) {
		return toString().charAt(index);
	}

	public CharSequence subSequence(int start, int end) {
		return toString().subSequence(start, end);
	}

	public Draw asDraw(ISkinSimple skinParam) {
		return new Draw(skinParam);
	}

	public class Draw extends AbstractTextBlock implements Line, Atom {
		private BufferedImage image;
		private final ISkinSimple skinParam;

		public List<Atom> splitInTwo(StringBounder stringBounder, double width) {
			return Arrays.asList((Atom) this);
		}

		private Draw(ISkinSimple skinParam) {
			this.skinParam = skinParam;
		}

		public double getStartingAltitude(StringBounder stringBounder) {
			return 0;
		}

		public Dimension2D calculateDimension(StringBounder stringBounder) {
			try {
				final BufferedImage im = getImage();
				return new Dimension2DDouble(im.getWidth(), im.getHeight());
			} catch (IOException e) {
				e.printStackTrace();
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
			return new Dimension2DDouble(42, 42);
		}

		public void drawU(UGraphic ug) {
			try {
				final boolean isSvg = ug.matchesProperty("SVG");
				if (isSvg) {
					final String imageSvg = getImageSvg();
					final UImageSvg svg = new UImageSvg(imageSvg, 1);
					ug.draw(svg);
					return;
				}
				final BufferedImage im = getImage();
				final UShape image = new UImage(new PixelImage(im, AffineTransformType.TYPE_BILINEAR));
				ug.draw(image);
			} catch (IOException e) {
				e.printStackTrace();
			} catch (InterruptedException e) {
				e.printStackTrace();
			}

		}

		private String getImageSvg() throws IOException, InterruptedException {
			final boolean sav = UseStyle.useBetaStyle();
			final Diagram system = getSystem();
			final ByteArrayOutputStream os = new ByteArrayOutputStream();
			system.exportDiagram(os, 0, new FileFormatOption(FileFormat.SVG));
			os.close();
			UseStyle.setBetaStyle(sav);
			return new String(os.toByteArray());
		}

		private BufferedImage getImage() throws IOException, InterruptedException {
			if (image == null) {
				final boolean sav = UseStyle.useBetaStyle();
				image = getImageSlow();
				UseStyle.setBetaStyle(sav);
			}
			return image;
		}

		private BufferedImage getImageSlow() throws IOException, InterruptedException {
			final Diagram system = getSystem();
			final ByteArrayOutputStream os = new ByteArrayOutputStream();
			system.exportDiagram(os, 0, new FileFormatOption(FileFormat.PNG));
			os.close();
			return ImageIO.read(os.toByteArray());
		}

		public HorizontalAlignment getHorizontalAlignment() {
			return HorizontalAlignment.LEFT;
		}

		private Diagram getSystem() throws IOException, InterruptedException {
			final BlockUml blockUml = new BlockUml(system.as2(), Defines.createEmpty(), skinParam, null);
			return blockUml.getDiagram();

		}
	}

}