/* 
    * 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 org.esigate.util;
  
  import java.util.List;
  
  import org.apache.http.Header;
  import org.apache.http.HttpHeaders;
  import org.apache.http.HttpHost;
  import org.apache.http.HttpRequest;
  import org.apache.http.NameValuePair;
  import org.esigate.impl.DriverRequest;
  
  public final class HttpRequestHelper {
  
      private HttpRequestHelper() {
      }
  
      public static String getFirstHeader(String name, HttpRequest request) {
          final Header header = request.getFirstHeader(name);
          String headerValue = null;
          if (header != null) {
              headerValue = header.getValue();
          }
          return headerValue;
      }
  
      public static String getParameter(DriverRequest request, String name) {
          String characterEncoding = request.getCharacterEncoding();
          if (characterEncoding == null) {
              characterEncoding = "ISO-8859-1";
          }
          List<NameValuePair> parameters =
                  UriUtils.parse(request.getOriginalRequest().getRequestLine().getUri(), characterEncoding);
          for (NameValuePair nameValuePair : parameters) {
              if (nameValuePair.getName().equals(name)) {
                  return nameValuePair.getValue();
              }
          }
          return null;
      }
  
      /**
       * Returns the target host as defined in the Host header or extracted from the request URI.
       * 
       * Usefull to generate Host header in a HttpRequest
       * 
       * @param request
       * @return the host formatted as host:port
       */
      public static HttpHost getHost(HttpRequest request) {
          HttpHost httpHost = UriUtils.extractHost(request.getRequestLine().getUri());
          String scheme = httpHost.getSchemeName();
          String host = httpHost.getHostName();
          int port = httpHost.getPort();
          Header[] headers = request.getHeaders(HttpHeaders.HOST);
          if (headers != null && headers.length != 0) {
              String headerValue = headers[0].getValue();
              String[] splitted = headerValue.split(":");
              host = splitted[0];
              if (splitted.length > 1) {
                  port = Integer.parseInt(splitted[1]);
              } else {
                  port = -1;
              }
          }
          return new HttpHost(host, port, scheme);
      }
  
  }