/**
 * Copyright (C) 2010-2017 Structr GmbH
 *
 * This file is part of Structr <http://structr.org>.
 *
 * Structr is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * Structr is 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with Structr.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.structr.websocket.command;

import java.util.List;
import java.util.Map;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.structr.common.SecurityContext;
import org.structr.common.error.FrameworkException;
import org.structr.core.app.App;
import org.structr.core.app.StructrApp;
import org.structr.core.graph.TransactionCommand;
import org.structr.web.diff.InvertibleModificationOperation;
import org.structr.web.entity.dom.DOMNode;
import org.structr.web.entity.dom.Page;
import org.structr.web.importer.Importer;
import org.structr.websocket.StructrWebSocket;
import org.structr.websocket.message.MessageBuilder;
import org.structr.websocket.message.WebSocketMessage;

/**
 *
 *
 *
 */
public class SaveNodeCommand extends AbstractCommand {

	private static final Logger logger = LoggerFactory.getLogger(SaveNodeCommand.class.getName());

	static {

		StructrWebSocket.addCommand(SaveNodeCommand.class);
	}

	@Override
	public void processMessage(final WebSocketMessage webSocketData) {

		final String nodeId = webSocketData.getId();
		final Map<String, Object> nodeData = webSocketData.getNodeData();
		final String modifiedHtml = (String) nodeData.get("source");
		final SecurityContext securityContext = getWebSocket().getSecurityContext();
		final App app = StructrApp.getInstance(securityContext);

		Page modifiedNode = null;

		DOMNode sourceNode = (DOMNode) getNode(nodeId);

		if (sourceNode != null) {

			TransactionCommand.registerNodeCallback(sourceNode, callback);

			try {

				// parse page from modified source
				modifiedNode = Importer.parsePageFromSource(securityContext, modifiedHtml, "__SaveNodeCommand_Temporary_Page__");


				DOMNode targetNode = modifiedNode;

				if (!(sourceNode instanceof Page)) {

					targetNode = (DOMNode) modifiedNode.getFirstChild().getNextSibling().getFirstChild().getNextSibling().getFirstChild();

				}

				final List<InvertibleModificationOperation> changeSet = Importer.diffNodes(sourceNode, targetNode);

				for (final InvertibleModificationOperation op : changeSet) {

					// execute operation
					op.apply(app, sourceNode.getClosestPage(), modifiedNode);

				}


			} catch (Throwable t) {

				logger.warn("", t);

				// send exception
				getWebSocket().send(MessageBuilder.status().code(422).message(t.toString()).build(), true);
			}

			try {

				app.delete(modifiedNode);

			} catch (FrameworkException ex) {

				logger.warn("", ex);
			}

		} else {

			// send exception
			getWebSocket().send(MessageBuilder.status().code(422).message("Cannot save page").build(), true);
		}

	}

	@Override
	public String getCommand() {

		return "SAVE_NODE";

	}

}