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/*
 * Copyright 2002-2016 Jalal Kiswani.
 *
 * 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 com.jk.application.parsers;


import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import java.util.Vector;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import com.jk.application.api.Application;
import com.jk.application.api.ApplicationSuperFactory;
import com.jk.application.api.Module;
import com.jk.application.listener.ApplicationListener;
import com.jk.db.datasource.JKDataSourceFactory;
import com.jk.exceptions.JKXmlException;
import com.jk.util.JK;
import com.jk.util.JKConversionUtil;

/**
 * The Class ApplicationXmlParser.
 *
 * @author Jalal Kiswani
 */
public class ApplicationXmlParser {

	private static int moduleIndex = 1;

	/**
	 * Parses the application.
	 *
	 * @param in
	 *            the in
	 * @return the application
	 * @throws JKXmlException
	 *             the JK xml exception
	 */
	public Application parseApplication(final InputStream in) throws JKXmlException {
		final DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
		DocumentBuilder builder;
		try {
			builder = factory.newDocumentBuilder();
			final Document doc = builder.parse(in);
			final Node root = doc.getFirstChild();
			final NodeList list = root.getChildNodes();
			final Application application = ApplicationSuperFactory.getInstance().createApplication();
			final List modules = new Vector();
			for (int i = 0; i < list.getLength(); i++) {
				final Node node = list.item(i);
				final String text = node.getTextContent().trim();
				if (node.getNodeName().equals("name")) {
					application.setApplicationName(text);
				} else if (node.getNodeName().equals("id")) {
					application.setApplicationId(Integer.parseInt(text));
				} else if (node.getNodeName().equals("config-file")) {
					application.setConfigFileName(text);
				} else if (node.getNodeName().equals("splash-img")) {
					application.setSplashImage(text);
					// }else if (node.getNodeName().equals("date-format")) {
					// JKDate.setDefaultDateFormat(text);
				} else if (node.getNodeName().equals("view-modules")) {
					application.setViewModules(Boolean.parseBoolean(text));
				} else if (node.getNodeName().equals("home-img")) {
					application.setHomeImage(text);
				} else if (node.getNodeName().equals("background-img")) {
					application.setBackgroundImage(text);
				} else if (node.getNodeName().equals("locale")) {
					application.setLocale(text, true);
				} else if (node.getNodeName().equals("auto-logout-interval")) {
					application.setSessionTimeout(JKConversionUtil.toInteger(text));
				} else if (node.getNodeName().equals("module")) {
					final Module module = parseModule(list.item(i));
					module.setApplication(application);
					modules.add(module);
				} else if (node.getNodeName().equals("listener")) {
					final ApplicationListener listener = parseListener(list.item(i));
					application.addListener(listener);
				}
			}
			application.setModules(modules);
			return application;
		} catch (final Exception e) {
			throw new JKXmlException(e);
		}

	}

	/**
	 *
	 * @param item
	 * @return
	 * @throws ClassNotFoundException
	 * @throws IllegalAccessException
	 * @throws InstantiationException
	 */
	private ApplicationListener parseListener(final Node item) throws Exception {
		final Element e = (Element) item;
		ApplicationListener listener = null;
		if (!e.getAttribute("class").equals("")) {
			final String className = e.getAttribute("class");
			listener = JK.newInstance(className);
		}
		return listener;
	}

	/**
	 *
	 * @param item
	 * @return
	 * @throws ClassNotFoundException
	 * @throws IllegalAccessException
	 * @throws InstantiationException
	 * @throws IOException
	 */
	protected Module parseModule(final Node item) throws Exception {
		final Element e = (Element) item;
		Module module = null;
		if (!e.getAttribute("class").equals("")) {
			final String className = e.getAttribute("class");
			module = (Module) Class.forName(className).newInstance();
		} else if (!e.getAttribute("config-path").equals("")) {
			final Module defaultModule = ApplicationSuperFactory.getInstance().createModule();
			defaultModule.setConfigPath(e.getAttribute("config-path"));
			module = defaultModule;
		}
		module.setIndex(moduleIndex++);
		if (!e.getAttribute("id").equals("")) {
			module.setModuleId(Integer.parseInt(e.getAttribute("id")));
		}
		if (!e.getAttribute("default").trim().equals("")) {
			module.setDefault(Boolean.parseBoolean(e.getAttribute("default")));
		}
		if (!e.getAttribute("datasource-config").trim().equals("")) {
			module.setDataSource(JKDataSourceFactory.createByConfigFile(e.getAttribute("datasource-config")));
		}
		module.setModuleName(e.getAttribute("name"));

		final NodeList list = item.getChildNodes();
		for (int i = 0; i < list.getLength(); i++) {
			if (list.item(i).getNodeName().equals("paramters")) {
			}
		}

		return module;
	}
}