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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.
/* +=======================================================================
 * |
 * |      PlantUML : a free UML diagram generator
 * |
 * +=======================================================================
 *
 * (C) Copyright 2009-2024, Arnaud Roques
 *
 * Project Info:  https://plantuml.com
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 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser 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 Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library.  If not, see .
 *
 * PlantUML can occasionally display sponsored or advertising messages. Those
 * messages are usually generated on welcome or error images and never on
 * functional diagrams.
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 * Images (whatever their format : PNG, SVG, EPS...) generated by running PlantUML
 * are owned by the author of their corresponding sources code (that is, their
 * textual description in PlantUML language). Those images are not covered by
 * this LGPL license.
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 * The generated images can then be used without any reference to the LGPL license.
 * It is not even necessary to stipulate that they have been generated with PlantUML,
 * although this will be appreciated by the PlantUML team.
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 * (see https://plantuml.com/graphviz-dot )
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 * Icons provided by OpenIconic :  https://useiconic.com/open
 * Archimate sprites provided by Archi :  http://www.archimatetool.com
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 * Brotli (c) by the Brotli Authors https://github.com/google/brotli
 * Themes (c) by Brett Schwarz https://github.com/bschwarz/puml-themes
 * Twemoji (c) by Twitter at https://twemoji.twitter.com/
 *
 */
package net.sourceforge.plantuml.project.solver;

import net.sourceforge.plantuml.project.Load;
import net.sourceforge.plantuml.project.core.TaskAttribute;
import net.sourceforge.plantuml.project.core3.Histogram;
import net.sourceforge.plantuml.project.core3.HistogramSimple;
import net.sourceforge.plantuml.project.core3.TaskLoad;
import net.sourceforge.plantuml.project.core3.TaskLoadImpl;
import net.sourceforge.plantuml.project.time.Instant;

public class Solver3 extends AbstractSolver {

	private final Histogram workLoad;

	public Solver3(Histogram workLoad) {
		this.workLoad = workLoad;
	}

	public TaskLoad solveForward(long totalLoad, long start) {
		final HistogramSimple resultLoad = new HistogramSimple();
		final TaskLoadImpl result = new TaskLoadImpl(resultLoad);

		start = workLoad.getNext(start - 1);
		result.setStart(start);
		long currentTime = start;
		while (totalLoad > 0) {
			final long tmpWorkLoad = workLoad.getValueAt(currentTime);
			final long nextChange = workLoad.getNext(currentTime);
			final long duration = nextChange - currentTime;
			if (duration <= 0)
				throw new IllegalArgumentException();

			final long partialLoad = duration * tmpWorkLoad;
			resultLoad.put(currentTime, tmpWorkLoad);

			if (partialLoad >= totalLoad) {
				final long end = currentTime + totalLoad / tmpWorkLoad;
				result.setEnd(end);
				resultLoad.put(end, 0);
				return result;
			}
			totalLoad -= partialLoad;
			currentTime = nextChange;
		}
		throw new UnsupportedOperationException();
	}

	public TaskLoad solveBackward(long totalLoad, long end) {
		throw new UnsupportedOperationException();
	}

	@Override
	protected Instant computeEnd() {
		Instant start = (Instant) values.get(TaskAttribute.START);
		int fullLoad = ((Load) values.get(TaskAttribute.LOAD)).getFullLoad();
		final TaskLoad taskLoad = solveBackward(fullLoad, start.getMillis());
		return Instant.create(taskLoad.getEnd());
	}

	@Override
	protected Instant computeStart() {
		throw new UnsupportedOperationException();
	}

}