/* ========================================================================
 * 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;

import static java.util.Objects.requireNonNull;

import java.io.File;
import java.io.IOException;
import java.io.Reader;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import net.sourceforge.plantuml.nio.PathSystem;
import net.sourceforge.plantuml.preproc.Defines;
import net.sourceforge.plantuml.preproc.ReadLineNumbered;
import net.sourceforge.plantuml.preproc.ReadLineReader;
import net.sourceforge.plantuml.preproc.UncommentReadLine;
import net.sourceforge.plantuml.preproc2.Preprocessor;
import net.sourceforge.plantuml.security.SFile;
import net.sourceforge.plantuml.text.StringLocated;
import net.sourceforge.plantuml.utils.StartUtils;

public final class BlockUmlBuilder implements DefinitionsContainer {
	// ::remove file when __HAXE__

	private final List<BlockUml> blocks = new ArrayList<>();
	private Set<File> usedFiles = new HashSet<>();
	private final PathSystem pathSystem;
	private final Charset charset;

//	/**
//	 * @deprecated being kept for backwards compatibility, perhaps other projects
//	 *             are using this?
//	 */
//	@Deprecated
//	public BlockUmlBuilder(List<String> config, String charset, Defines defines, Reader readerInit, SFile newCurrentDir,
//			String desc) throws IOException {
//		this(config, charsetOrDefault(charset), defines, readerInit, newCurrentDir, desc);
//	}
//
//	/**
//	 * @deprecated being kept for backwards compatibility, perhaps other projects
//	 *             are using this?
//	 */
//	@Deprecated
//	public BlockUmlBuilder(List<String> config, String charset, Defines defines, Reader reader) throws IOException {
//		this(config, charset, defines, reader, null, null);
//	}

	public BlockUmlBuilder(List<String> config, Charset charset, Defines defines, Reader readerInit,
			SFile newCurrentDir, String desc) throws IOException {

		this.charset = requireNonNull(charset);
		final UncommentReadLine reader = new UncommentReadLine(ReadLineReader.create(readerInit, desc));
		// this.importedFiles = ImportedFiles.createImportedFiles(new AParentFolderRegular(newCurrentDir));
		this.pathSystem = PathSystem.fetch().changeCurrentDirectory(newCurrentDir);

		try (ReadLineNumbered includer = new Preprocessor(config, reader)) {
			StringLocated s = null;
			List<StringLocated> current = null;
			boolean paused = false;

			while ((s = includer.readLine()) != null) {
				if (StartUtils.isArobaseStartDiagram(s.getString())) {
					current = new ArrayList<>();
					paused = false;
				}
				if (StartUtils.isArobasePauseDiagram(s.getString())) {
					paused = true;
					reader.setPaused(true);
				}
				if (StartUtils.isExit(s.getString())) {
					paused = true;
					reader.setPaused(true);
				}
				if (current != null && paused == false) {
					current.add(s);
				} else if (paused) {
					final StringLocated append = StartUtils.getPossibleAppend(s);
					if (append != null)
						current.add(append);

				}

				if (StartUtils.isArobaseUnpauseDiagram(s.getString())) {
					paused = false;
					reader.setPaused(false);
				}
				if (StartUtils.isArobaseEndDiagram(s.getString()) && current != null) {
					if (paused)
						current.add(s);

					final BlockUml uml = new BlockUml(this, pathSystem, current, defines.cloneMe(), null, charset);
					usedFiles.addAll(uml.getIncluded());
					blocks.add(uml);
					current = null;
					reader.setPaused(false);
				}
			}
		} finally {
			readerInit.close();
		}
	}

	public List<BlockUml> getBlockUmls() {
		return Collections.unmodifiableList(blocks);
	}

	public final Set<File> getIncludedFiles() {
		return usedFiles;
	}

	public List<String> getDefinition(String name) {
		for (BlockUml block : blocks)
			if (block.isStartDef(name))
				return block.getDefinition(false);

		return Collections.emptyList();
	}

//	public final ImportedFiles getImportedFiles() {
//		return importedFiles;
//	}

	/**
	 * @deprecated being kept for backwards compatibility, perhaps other projects
	 *             are using this?
	 */
	@Deprecated
	public final String getCharset() {
		return charset.name();
	}

	public PathSystem getPathSystem() {
		return pathSystem;
	}

}
