/* ========================================================================
 * PlantUML : a free UML diagram generator
 * ========================================================================
 *
 * (C) Copyright 2009-2017, 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.graphic;

import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.font.FontRenderContext;
import java.awt.font.LineMetrics;
import java.awt.geom.Dimension2D;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;

import net.sourceforge.plantuml.ColorParam;
import net.sourceforge.plantuml.Dimension2DDouble;
import net.sourceforge.plantuml.ISkinParam;
import net.sourceforge.plantuml.LineParam;
import net.sourceforge.plantuml.RoundParam;
import net.sourceforge.plantuml.cucadiagram.Display;
import net.sourceforge.plantuml.posimo.Positionable;
import net.sourceforge.plantuml.posimo.PositionableImpl;
import net.sourceforge.plantuml.skin.rose.Rose;
import net.sourceforge.plantuml.ugraphic.LimitFinder;
import net.sourceforge.plantuml.ugraphic.MinMax;
import net.sourceforge.plantuml.ugraphic.UFont;
import net.sourceforge.plantuml.ugraphic.UGraphic;
import net.sourceforge.plantuml.ugraphic.UStroke;

public class TextBlockUtils {

	public static TextBlock bordered(TextBlock textBlock, UStroke stroke, HtmlColor borderColor,
			HtmlColor backgroundColor, double cornersize) {
		return new TextBlockBordered(textBlock, stroke, borderColor, backgroundColor, cornersize);
	}

	public static TextBlock title(FontConfiguration font, Display stringsToDisplay, ISkinParam skinParam) {
		UStroke stroke = skinParam.getThickness(LineParam.titleBorder, null);
		final Rose rose = new Rose();
		HtmlColor borderColor = rose.getHtmlColor(skinParam, ColorParam.titleBorder);
		final HtmlColor backgroundColor = rose.getHtmlColor(skinParam, ColorParam.titleBackground);
		final TextBlockTitle result = new TextBlockTitle(font, stringsToDisplay, skinParam);
		if (stroke == null && borderColor == null) {
			return result;
		}
		if (stroke == null) {
			stroke = new UStroke(1.5);
		}
		if (borderColor == null) {
			borderColor = HtmlColorUtils.BLACK;
		}
		final double corner = skinParam.getRoundCorner(RoundParam.titleBorder, null);
		return withMargin(bordered(result, stroke, borderColor, backgroundColor, corner), 2, 2);
	}

	public static TextBlock withMargin(TextBlock textBlock, double marginX, double marginY) {
		return new TextBlockMarged(textBlock, marginX, marginX, marginY, marginY);
	}

	public static TextBlock withMargin(TextBlock textBlock, double marginX1, double marginX2, double marginY1,
			double marginY2) {
		return new TextBlockMarged(textBlock, marginX1, marginX2, marginY1, marginY2);
	}

	public static TextBlock withMinWidth(TextBlock textBlock, double minWidth, HorizontalAlignment horizontalAlignment) {
		return new TextBlockMinWidth(textBlock, minWidth, horizontalAlignment);
	}

	public static TextBlock empty(final double width, final double height) {
		return new AbstractTextBlock() {
			public void drawU(UGraphic ug) {
			}

			public Dimension2D calculateDimension(StringBounder stringBounder) {
				return new Dimension2DDouble(width, height);
			}
		};
	}

	public static Positionable asPositionable(TextBlock textBlock, StringBounder stringBounder, Point2D pt) {
		return new PositionableImpl(pt, textBlock.calculateDimension(stringBounder));
	}

	public static TextBlock mergeLR(TextBlock b1, TextBlock b2, VerticalAlignment verticallAlignment) {
		return new TextBlockHorizontal(b1, b2, verticallAlignment);
	}

	public static TextBlock mergeTB(TextBlock b1, TextBlock b2, HorizontalAlignment horizontalAlignment) {
		return new TextBlockVertical2(b1, b2, horizontalAlignment);
	}

	public static MinMax getMinMax(TextBlock tb, StringBounder stringBounder) {
		final LimitFinder limitFinder = new LimitFinder(stringBounder, false);
		tb.drawU(limitFinder);
		return limitFinder.getMinMax();
	}

	private static final Graphics2D gg;

	static {
		final BufferedImage imDummy = new BufferedImage(10, 10, BufferedImage.TYPE_INT_RGB);
		gg = imDummy.createGraphics();
	}

	public static boolean isEmpty(TextBlock text, StringBounder dummyStringBounder) {
		if (text == null) {
			return true;
		}
		final Dimension2D dim = text.calculateDimension(dummyStringBounder);
		return dim.getHeight() == 0 && dim.getWidth() == 0;
	}

	public static FontRenderContext getFontRenderContext() {
		return gg.getFontRenderContext();
	}

	public static LineMetrics getLineMetrics(UFont font, String text) {
		return font.getLineMetrics(gg, text);
	}

	public static FontMetrics getFontMetrics(Font font) {
		return gg.getFontMetrics(font);
	}

	public static TextBlock fullInnerPosition(final TextBlock bloc, final String display) {
		return new TextBlock() {

			public void drawU(UGraphic ug) {
				bloc.drawU(ug);
			}

			public Dimension2D calculateDimension(StringBounder stringBounder) {
				return bloc.calculateDimension(stringBounder);
			}
			
			public MinMax getMinMax(StringBounder stringBounder) {
				return bloc.getMinMax(stringBounder);
			}

			public Rectangle2D getInnerPosition(String member, StringBounder stringBounder, InnerStrategy strategy) {
				if (strategy.check(display, member)) {
					final Dimension2D dim = calculateDimension(stringBounder);
					return new Rectangle2D.Double(0, 0, dim.getWidth(), dim.getHeight());
				}
				return null;
			}

		};
	}

}