/* ========================================================================
 * PlantUML : a free UML diagram generator
 * ========================================================================
 *
 * (C) Copyright 2009-2024, Arnaud Roques
 *
 * Project Info:  https://plantuml.com
 * 
 * If you like this project or if you find it useful, you can support us at:
 * 
 * https://plantuml.com/patreon (only 1$ per month!)
 * https://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.sequencediagram.teoz;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

public class Stairs {

	private final List<Step> values = new ArrayList<>();

	public void addStep(Step step) {
		if (step.getIndent() < 0) {
			throw new IllegalArgumentException();
		}
		if (values.size() > 0) {
			final double lastY = values.get(values.size() - 1).getValue();
			if (step.getValue() < lastY) {
				// throw new IllegalArgumentException();
				return;
			}
		}
		values.add(step);
	}

	public int getMaxIndent() {
		int max = Integer.MIN_VALUE;
		for (Step step : values) {
			final int v = step.getIndent();
			if (v > max) {
				max = v;
			}
		}
		return max;
	}

	public Collection<Step> getSteps() {
		return Collections.unmodifiableCollection(values);
	}

}
