/*
 * ============LICENSE_START==========================================
 * ONAP Portal SDK
 * ===================================================================
 * Copyright (C) 2017-2018 AT&T Intellectual Property. All rights reserved.
 * ===================================================================
 *
 * Unless otherwise specified, all software contained herein is licensed
 * under the Apache License, Version 2.0 (the "License");
 * you may not use this software 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.
 *
 * Unless otherwise specified, all documentation contained herein is licensed
 * under the Creative Commons License, Attribution 4.0 Intl. (the "License");
 * you may not use this documentation except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *             https://creativecommons.org/licenses/by/4.0/
 *
 * Unless required by applicable law or agreed to in writing, documentation
 * 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.
 *
 * ============LICENSE_END============================================
 *
 * 
 */
package org.onap.portalsdk.core.logging.logic;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

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

import org.springframework.util.ResourceUtils;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

public class LoggerProperties {

	public static final String MDC_APPNAME = "AppName";
	public static final String MDC_REST_PATH = "RestPath";
	public static final String MDC_REST_METHOD = "RestMethod";
	public static final String INSTANCE_UUID = "instance_uuid";
	public static final String MDC_CLASS_NAME = "ClassName";
	public static final String MDC_LOGIN_ID = "LoginId";
	public static final String MDC_TIMER = "Timer";
	public static final String SDK_NAME = "ECOMP_SDK";
	public static final String ECOMP_REQUEST_ID = "X-ECOMP-RequestID";
	public static final String PARTNER_NAME = "PartnerName";
	public static final String FULL_URL = "Full-URL";
	public static final String AUDITLOG_BEGIN_TIMESTAMP = "AuditLogBeginTimestamp";
	public static final String AUDITLOG_END_TIMESTAMP = "AuditLogEndTimestamp";
	public static final String METRICSLOG_BEGIN_TIMESTAMP = "MetricsLogBeginTimestamp";
	public static final String METRICSLOG_END_TIMESTAMP = "MetricsLogEndTimestamp";
	public static final String CLIENT_IP_ADDRESS = "ClientIPAddress";
	public static final String STATUS_CODE = "StatusCode";
	public static final String RESPONSE_CODE = "ResponseCode";

	public static final String HTTP = "HTTP";
	public static final String HTTPS = "HTTPS";
	public static final String UNKNOWN = "Unknown";
	public static final String PROTOCOL = "PROTOCOL";
	public static final String USERAGENT_NAME = "user-agent";
	public static final String USER_ATTRIBUTE_NAME = "user_attribute_name";

	public static final String ALERT_SEVERITY = "AlertSeverity";
	public static final String ERROR_CATAGORY = "ErrorCategory";
	public static final String ERROR_CODE = "ErrorCode";
	public static final String ERROR_DESCRIPTION = "ErrorDescription";
	public static final String CUSTOM_FIELD1 = "CustomField1";
	public static final String CUSTOM_FIELD2 = "CustomField2";
	public static final String APP_NAME = "application_name";

	private LoggerProperties() {
	}

	private static Properties properties; 

	private static DocumentBuilderFactory dbFactory;

	private static DocumentBuilder dBuilder;

	private static Document doc;

	private static String propertyFileName = "classpath:logback.xml";

	private static final Object lockObject = new Object();

	/**
	 * Gets the property value for the specified key. If a value is found, leading
	 * and trailing space is trimmed.
	 *
	 * @param property Property key
	 * @return Value for the named property; null if the property file was not
	 *         loaded or the key was not found.
	 */
	public static String getProperty(String property) {
		if (properties == null) {
			synchronized (lockObject) {
				try {
					if (!initialize()) {
						return null;
					}
				} catch (IOException e) {
					return null;
				}
			}
		}
		String value = properties.getProperty(property);
		if (value != null)
			value = value.trim();
		return value;
	}

	/**
	 * Reads properties from a portal.properties file on the classpath.
	 * 
	 * Clients do NOT need to call this method. Clients MAY call this method to test
	 * whether the properties file can be loaded successfully.
	 * 
	 * @return True if properties were successfully loaded, else false.
	 * @throws IOException                  On failure
	 * @throws SAXException
	 * @throws ParserConfigurationException
	 */
	private static boolean initialize() throws IOException {
		File xmlFile = null;
//		if (properties != null)
//			return true;
//		InputStream in = LoggerProperties.class.getClassLoader().getResourceAsStream(propertyFileName);

		if (dbFactory != null)
			return true;
//		if (in == null)
//			return false;
		if (dbFactory == null)
//			properties = new Properties();
		dbFactory = DocumentBuilderFactory.newInstance();
		try {
//			properties.load(in);
			xmlFile = ResourceUtils.getFile(propertyFileName);
			dBuilder = dbFactory.newDocumentBuilder();
			doc = dBuilder.parse(xmlFile);
			doc.getDocumentElement().normalize();
		} catch (IOException | SAXException | ParserConfigurationException e) {
			return false;
		} finally {
//			in.close();
		}
		return true;
	}

	public static String getPropertyValue(String propertyName) {

		if (dbFactory == null) {
			synchronized (lockObject) {
				try {
					if (!initialize()) {
						return null;
					}
				} catch (IOException e) {
					return null;
				}
			}
		}
		String value = getValue(doc, propertyName);
		if (value != null)
			value = value.trim();
		return value;

	}

	private static String getValue(Document someNode, String property) {
		NodeList nodeList = someNode.getElementsByTagName("property");
		String Value = null;
		for (int i = 0; i < nodeList.getLength(); i++) {
			Node node = nodeList.item(i);
			if (node instanceof Element) {
				if (((Element) node).getAttribute("name").toString().equals(property)) {
					Value = ((Element) node).getAttribute("value").toString();
				}
			}
		}
		return Value;
	}
}