/* ========================================================================
 * PlantUML : a free UML diagram generator
 * ========================================================================
 *
 * (C) Copyright 2009-2023, 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.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 *
 * Original Author:  Arnaud Roques
 */
package net.sourceforge.plantuml.cucadiagram.dot;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.List;

import net.sourceforge.plantuml.baraye.IGroup;
import net.sourceforge.plantuml.cucadiagram.GroupRoot;
import net.sourceforge.plantuml.cucadiagram.GroupType;
import net.sourceforge.plantuml.cucadiagram.ICucaDiagram;
import net.sourceforge.plantuml.cucadiagram.LeafType;
import net.sourceforge.plantuml.graphic.StringBounder;
import net.sourceforge.plantuml.svek.GroupPngMakerState;
import net.sourceforge.plantuml.svek.IEntityImage;

public final class CucaDiagramSimplifierState {

	private final ICucaDiagram diagram;
	private final StringBounder stringBounder;

	public CucaDiagramSimplifierState(ICucaDiagram diagram, List<String> dotStrings, StringBounder stringBounder)
			throws IOException, InterruptedException {
		this.diagram = diagram;
		this.stringBounder = stringBounder;
		boolean changed;
		do {
			changed = false;
			final Collection<IGroup> groups = getOrdered(diagram.getRootGroup());
			for (IGroup g : groups) {
				if (diagram.isAutarkic(g)) {
					final IEntityImage img = computeImage(g);
					g.overrideImage(img, g.getGroupType() == GroupType.CONCURRENT_STATE ? LeafType.STATE_CONCURRENT
							: LeafType.STATE);

					changed = true;
				}
			}
		} while (changed);
	}

	private Collection<IGroup> getOrdered(IGroup root) {
		final Collection<IGroup> ordered = new LinkedHashSet<>();
		ordered.add(root);
		int size = 1;
		while (true) {
			size = ordered.size();
			addOneLevel(ordered);
			if (size == ordered.size()) {
				break;
			}
		}
		final List<IGroup> result = new ArrayList<>();
		for (IGroup g : ordered) {
			if (g instanceof GroupRoot == false) {
				result.add(0, g);
			}
		}
		return result;
	}

	private void addOneLevel(Collection<IGroup> currents) {
		for (IGroup g : new ArrayList<>(currents)) {
			for (IGroup child : reverse(g.getChildren())) {
				currents.add(child);
			}
		}
	}

	private List<IGroup> reverse(Collection<IGroup> source) {
		final List<IGroup> result = new ArrayList<>();
		for (IGroup g : source) {
			result.add(0, g);
		}
		return result;
	}

	private IEntityImage computeImage(IGroup g) throws IOException, InterruptedException {
		final GroupPngMakerState maker = new GroupPngMakerState(diagram, g, stringBounder);
		return maker.getImage();
	}

}
