/* ========================================================================
 * PlantUML : a free UML diagram generator
 * ========================================================================
 *
 * (C) Copyright 2009-2023, 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.command.note;

import java.util.List;

import net.sourceforge.plantuml.LineLocation;
import net.sourceforge.plantuml.command.BlocLines;
import net.sourceforge.plantuml.command.CommandExecutionResult;
import net.sourceforge.plantuml.command.SingleLineCommand2;
import net.sourceforge.plantuml.command.regex.IRegex;
import net.sourceforge.plantuml.command.regex.RegexConcat;
import net.sourceforge.plantuml.command.regex.RegexLeaf;
import net.sourceforge.plantuml.command.regex.RegexResult;
import net.sourceforge.plantuml.cucadiagram.CucaDiagram;
import net.sourceforge.plantuml.cucadiagram.Link;
import net.sourceforge.plantuml.graphic.color.ColorParser;
import net.sourceforge.plantuml.graphic.color.ColorType;
import net.sourceforge.plantuml.ugraphic.color.NoSuchColorException;

public final class CommandConstraintOnLinks extends SingleLineCommand2<CucaDiagram> {

	public CommandConstraintOnLinks() {
		super(getRegexConcat());
	}

	private static IRegex getRegexConcat() {
		return RegexConcat.build(CommandConstraintOnLinks.class.getName(), RegexLeaf.start(), //
				new RegexLeaf("constraint"), //
				RegexLeaf.spaceZeroOrMore(), //
				new RegexLeaf("on"), //
				RegexLeaf.spaceOneOrMore(), //
				new RegexLeaf("links"), //
				RegexLeaf.spaceZeroOrMore(), //
				color().getRegex(), //
				RegexLeaf.spaceZeroOrMore(), //
				new RegexLeaf(":"), //
				RegexLeaf.spaceZeroOrMore(), //
				new RegexLeaf("NOTE", "(.*)"), RegexLeaf.end());
	}

	private static ColorParser color() {
		return ColorParser.simpleColor(ColorType.BACK);
	}

	@Override
	protected CommandExecutionResult executeArg(CucaDiagram diagram, LineLocation location, RegexResult arg) throws NoSuchColorException {
		final List<Link> links = diagram.getTwoLastLinks();
		if (links == null) {
			return CommandExecutionResult.error("Cannot put constraint on two last links");
		}
		final BlocLines note = BlocLines.getWithNewlines(arg.get("NOTE", 0));
		return diagram.constraintOnLinks(links.get(0), links.get(1), note.toDisplay());
	}

}
