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/*
 * Copyright 2017 by Thomas Mauch
 *
 * 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.
 */
package org.magicwerk.brownies.html.content;

import org.jdom2.Element;
import org.magicwerk.brownies.collections.IList;
import org.magicwerk.brownies.core.ObjectTools;
import org.magicwerk.brownies.core.files.FileTools;
import org.magicwerk.brownies.core.files.PathTools;
import org.magicwerk.brownies.html.HtmlElement;
import org.magicwerk.brownies.jdom.JdomTools;
import org.magicwerk.brownies.jdom.JdomXpath;

/**
 * Visualizes CAR as HTML.
 *
 * @author Thomas Mauch
 * @version $Id$
 */
public class HtmlReload {

	public static class ReloadHtml {
		Element doc;
		Element data;
		String reloadFile;

		ReloadHtml(HtmlElement content, String reloadFile) {
			doc = content.getElement();

			this.reloadFile = reloadFile;
		}

		void makeIdReloadable(String id, String relXPath) {
			String reloadId = "reload-" + id;

			//String xpath = ".//*[@id='" + id + "']";
			//Element docElem2 = JdomTools.selectSingleNode(doc, xpath, Element.class);

			Element docElem2 = JdomTools.selectFirstElement(doc, e -> id.equals(e.getAttributeValue("id")));
			String text = JdomTools.getText(docElem2);

			Element docElem = JdomXpath.selectSingleNode(docElem2, relXPath, Element.class);
			Element dataElem = docElem.clone();

			// Fix data
			dataElem.setAttribute("id", reloadId);
			dataElem.detach();
			data = dataElem;

			// Fix doc
			Element reloadElem = new Element("div");
			reloadElem.setAttribute("id", id);
			reloadElem.setAttribute("class", "reload");
			String reloadLink = reloadFile + "#" + reloadId;
			reloadElem.setAttribute("data-reload", reloadLink);
			JdomTools.addText(reloadElem, text);
			JdomTools.replace(docElem, reloadElem);
		}
	}

	public static final String RELOAD_MARKER = "data-reload-marker";

	/**
	 * Create a separate file for all elements marked with attribute "data-reload-marker".
	 * The element will be replaced with dummy elements having class="reload" and data-reload="{url}" pointing to the file to reload.
	 * The data file will have name "{base}-data-{id}.html" with htmlFile being "{base}.html"
	 * 
	 * @param htmlFile	name of main HTML file (used as base for data files)
	 * @param content	full HTML content (will be modified)
	 */
	public static void writeReloadFiles(String htmlFile, HtmlElement content) {
		// Get all ids marked
		IList ids = JdomTools.selectElements(content.getElement(),
				e -> ObjectTools.equals(e.getAttributeValue(RELOAD_MARKER), "true"))
				.map(e -> e.getAttributeValue("id"));

		for (String id : ids) {
			String dataFile = PathTools.getNameBase(htmlFile) + "-data-" + id + "." + PathTools.getNameSuffix(htmlFile);

			ReloadHtml rh = new ReloadHtml(content, PathTools.getName(dataFile));
			rh.makeIdReloadable(id, "../..");

			//HtmlBlock body = new HtmlBlock(null, HtmlConst.ELEM_BODY);
			//body.getElement().addContent(content.getElement());
			boolean pretty = true;
			String dataOutput = JdomTools.print(rh.data, pretty);
			FileTools.writeFile().setCreateDirs(true).setFile(dataFile).setText(dataOutput).write();
		}
	}
}