/* See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * Esri Inc. licenses this file to You 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.esri.gpt.control.livedata;

import com.esri.gpt.control.livedata.selector.HttpRequestDefinition;
import com.esri.gpt.control.livedata.selector.IHttpResponseListener;
import com.esri.gpt.control.livedata.selector.IRegistry;
import com.esri.gpt.control.livedata.selector.ISetter;
import com.esri.gpt.framework.http.ResponseInfo;
import com.esri.gpt.framework.util.Val;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Node;

/**
 * Sensor observation service renderer factory.
 */
class SosRendererFactory extends MapBasedRendererFactory {

  /** get capabilities request */
  private static String GET_CAPABILITIES_REQUEST = "service=SOS&request=GetCapabilities";
  /** context path */
  private String contextPath = "";
  /** proxy URL */
  private String proxyUrl = "";

  @Override
  public boolean isDefinitive() {
    return true;
  }

  @Override
  public void register(IRegistry reg, final ISetter setter, final String url) {
    int qmark = url.lastIndexOf("?");
    final String serviceUrl = qmark >= 0 ? url.substring(0, qmark) : url;
    final String queryString = qmark >= 0 ? url.substring(qmark + 1) : "";

    Query query = new Query(queryString);
    if (query.containsKey("service") && !query.get("service").equalsIgnoreCase("SOS"))
      return;
    query = new Query(GET_CAPABILITIES_REQUEST).mixin(query);

    final String getCapabilitiesUrl = serviceUrl + "?" + query;

    reg.register(new HttpRequestDefinition(getCapabilitiesUrl), new IHttpResponseListener() {

      public void onResponse(ResponseInfo info, String strContent, Document docContent) {
        if (docContent != null) {
          try {
            XPathFactory xPathFactory = XPathFactory.newInstance();
            XPath xPath = xPathFactory.newXPath();

            Node ndSosCapabilities = (Node) xPath.evaluate("/Capabilities", docContent, XPathConstants.NODE);

            if (ndSosCapabilities != null) {
              setter.set(new SosRenderer() {

                protected String getContextUrl() {
                  return contextPath;
                }

                @Override
                protected String getUrl() {
                  return getCapabilitiesUrl;
                }

                @Override
                protected String getProxyUrl() {
                  return contextPath + proxyUrl;
                }

                @Override
                protected int getMapHeightAdjustment() {
                  return getProperties().getMapHeightAdjustment();
                }
              });
            }

          } catch (Exception ex) {
          }
        }
      }
    });
  }

  /**
   * Creates instance of the factory.
   * @param properties properties
   * @param contextPath context path
   * @param proxyUrl proxy URL
   */
  public SosRendererFactory(ILiveDataProperties properties, String contextPath, String proxyUrl) {
    super(properties);
    this.contextPath = Val.chkStr(contextPath);
    this.proxyUrl = Val.chkStr(proxyUrl);
  }
}