/* ========================================================================
 * PlantUML : a free UML diagram generator
 * ========================================================================
 *
 * (C) Copyright 2009-2020, Arnaud Roques
 *
 * Project Info:  http://plantuml.com
 * 
 * If you like this project or if you find it useful, you can support us at:
 * 
 * http://plantuml.com/patreon (only 1$ per month!)
 * http://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.jsondiagram;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import net.sourceforge.plantuml.ISkinParam;
import net.sourceforge.plantuml.StringLocated;
import net.sourceforge.plantuml.command.BlocLines;
import net.sourceforge.plantuml.style.Style;
import net.sourceforge.plantuml.style.StyleBuilder;
import net.sourceforge.plantuml.style.StyleLoader;

public class StyleExtractor {

	private final List<String> list = new ArrayList<>();
	private final List<StringLocated> style = new ArrayList<>();
	private String title = null;

	public StyleExtractor(Iterator<StringLocated> data) {
		while (data.hasNext()) {
			StringLocated line = data.next();
			if (startStyle(line)) {
				while (data.hasNext()) {
					style.add(line);
					if (endStyle(line))
						break;
					line = data.next();
				}
			} else if (line.getString().trim().startsWith("!assume ")) {
				// Ignore
			} else if (line.getString().trim().startsWith("!pragma ")) {
				// Ignore
			} else if (line.getString().trim().startsWith("hide ")) {
				// Ignore
			} else if (line.getString().trim().startsWith("title ")) {
				this.title = line.getString().trim().substring("title ".length()).trim();
			} else if (line.getString().trim().startsWith("skinparam ")) {
				if (line.getString().trim().contains("{")) {
					while (data.hasNext()) {
						if (line.getString().trim().equals("}"))
							break;
						line = data.next();
					}
				}
			} else {
				list.add(line.getString());
			}
		}
	}

	private boolean startStyle(StringLocated line) {
		return line.getString().trim().equals("<style>");
	}

	private boolean endStyle(StringLocated line) {
		return line.getString().trim().equals("</style>");
	}

	public void applyStyles(ISkinParam skinParam) {
		if (style.size() > 0) {
			final StyleBuilder styleBuilder = skinParam.getCurrentStyleBuilder();
			final BlocLines blocLines = BlocLines.from(style);
			for (Style modifiedStyle : StyleLoader.getDeclaredStyles(blocLines.subExtract(1, 1), styleBuilder)) {
				skinParam.muteStyle(modifiedStyle);
			}
		}
	}

	public Iterator<String> getIterator() {
		return list.iterator();
	}

	public String getTitle() {
		return title;
	}

}
