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PlantUML is a component that allows to quickly write diagrams from text.
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// THIS FILE HAS BEEN GENERATED BY A PREPROCESSOR.
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package net.sourceforge.plantuml.project.lang;

import net.sourceforge.plantuml.project.Failable;
import net.sourceforge.plantuml.project.GanttDiagram;
import net.sourceforge.plantuml.project.time.Day;
import net.sourceforge.plantuml.regex.IRegex;
import net.sourceforge.plantuml.regex.RegexConcat;
import net.sourceforge.plantuml.regex.RegexLeaf;
import net.sourceforge.plantuml.regex.RegexOr;
import net.sourceforge.plantuml.regex.RegexResult;

public class ComplementDate implements Something {

	private final Type type;

	static enum Type {
		ANY, ONLY_RELATIVE, ONLY_ABSOLUTE;
	}

	private ComplementDate(Type type) {
		this.type = type;
	}

	public static ComplementDate any() {
		return new ComplementDate(Type.ANY);
	}

	public static ComplementDate onlyRelative() {
		return new ComplementDate(Type.ONLY_RELATIVE);
	}

	public static ComplementDate onlyAbsolute() {
		return new ComplementDate(Type.ONLY_ABSOLUTE);
	}

	public IRegex toRegex(String suffix) {
		final DayPattern dayPattern = new DayPattern(suffix);
		switch (type) {
		case ONLY_ABSOLUTE:
			return dayPattern.toRegex();
		case ONLY_RELATIVE:
			return new RegexOr(toRegexD(suffix), toRegexE(suffix));
		}
		return new RegexOr(dayPattern.toRegex(), toRegexD(suffix), toRegexE(suffix));
	}

	private IRegex toRegexD(String suffix) {
		return new RegexConcat( //
				new RegexLeaf("DCOUNT" + suffix, "([\\d]+)"), //
				RegexLeaf.spaceOneOrMore(), //
				new RegexLeaf("days?"), //
				RegexLeaf.spaceOneOrMore(), //
				new RegexLeaf("after"), //
				RegexLeaf.spaceOneOrMore(), //
				new RegexLeaf("start") //
		);
	}

	private IRegex toRegexE(String suffix) {
		return new RegexConcat( //
				new RegexLeaf("[dD]\\+"), //
				new RegexLeaf("ECOUNT" + suffix, "([\\d]+)") //
		);
	}

	public Failable getMe(GanttDiagram system, RegexResult arg, String suffix) {
		final DayPattern dayPattern = new DayPattern(suffix);
		final Day result = dayPattern.getDay(arg);

		if (result != null)
			return Failable.ok(result);

		if (arg.get("DCOUNT" + suffix, 0) != null)
			return Failable.ok(resultD(system, arg, suffix));

		if (arg.get("ECOUNT" + suffix, 0) != null)
			return Failable.ok(resultE(system, arg, suffix));

		throw new IllegalStateException();
	}

	private Day resultD(GanttDiagram system, RegexResult arg, String suffix) {
		final int day = Integer.parseInt(arg.get("DCOUNT" + suffix, 0));
		return system.getStartingDate().addDays(day);
	}

	private Day resultE(GanttDiagram system, RegexResult arg, String suffix) {
		final int day = Integer.parseInt(arg.get("ECOUNT" + suffix, 0));
		return system.getStartingDate().addDays(day);
	}

}