/*
 * ============LICENSE_START========================================================================
 * ONAP : tr-069-adapter
 * =================================================================================================
 * Copyright (C) 2020 CommScope Inc Intellectual Property.
 * =================================================================================================
 * This tr-069-adapter software file is distributed by CommScope Inc 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
 *
 * This file 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.commscope.tr069adapter.netconf.notification;

import java.io.IOException;
import java.io.StringWriter;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.commscope.tr069adapter.mapper.model.NetConfNotificationDTO;
import org.commscope.tr069adapter.netconf.rpc.CreateSubscription;
import org.opendaylight.netconf.api.NetconfMessage;
import org.opendaylight.netconf.api.xml.XmlUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import org.w3c.dom.Element;
import org.xml.sax.SAXException;

@Component
public class NetConfSessionUtil {

  private static final Logger LOG = LoggerFactory.getLogger(NetConfSessionUtil.class);

  public void sendNetConfNotification(NetConfNotificationDTO netConNotifDTO) {
    NetconfMessage netconfMessage = convertToNetConfMessage(netConNotifDTO);
    LOG.debug("Notification converted to NetConf format" + netconfMessage);
    CreateSubscription.sendNotification(netconfMessage, netConNotifDTO.getDeviceID());
  }

  private NetconfMessage convertToNetConfMessage(NetConfNotificationDTO netConNotifDTO) {
    try {
      return new NetconfMessage(XmlUtil.readXmlToDocument(netConNotifDTO.getNotificaiton()));
    } catch (SAXException | IOException e) {
      throw new IllegalArgumentException("Cannot parse notifications", e);
    }
  }

  public static String convertDocumentToString(Element element) {
    String strxml = null;
    try {
      TransformerFactory transformerFactory = TransformerFactory.newInstance();
      Transformer transformer = transformerFactory.newTransformer();
      DOMSource source = new DOMSource(element);
      StreamResult result = new StreamResult(new StringWriter());
      transformer.transform(source, result);
      strxml = result.getWriter().toString();
    } catch (Exception e) {
      LOG.error("Error while converting Element to String" + e);
    }
    LOG.debug("Converted XML is : " + strxml);
    return strxml;
  }

}