/*
    * ====================================================================
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF 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.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  package org.apache.hc.client5.http.routing;
  
  import java.net.URI;
  import java.net.URISyntaxException;
  
  import org.apache.hc.client5.http.SchemePortResolver;
  import org.apache.hc.client5.http.impl.DefaultSchemePortResolver;
  import org.apache.hc.client5.http.utils.URIUtils;
  import org.apache.hc.core5.http.HttpException;
  import org.apache.hc.core5.http.HttpHost;
  import org.apache.hc.core5.http.HttpRequest;
  import org.apache.hc.core5.http.ProtocolException;
  import org.apache.hc.core5.net.URIAuthority;
  
  public final class RoutingSupport {
  
      public static HttpHost determineHost(final HttpRequest request) throws HttpException {
          if (request == null) {
              return null;
          }
          final URIAuthority authority = request.getAuthority();
          if (authority != null) {
              final String scheme = request.getScheme();
              if (scheme == null) {
                  throw new ProtocolException("Protocol scheme is not specified");
              }
              return new HttpHost(scheme, authority);
          }
          try {
              final URI requestURI = request.getUri();
              if (requestURI.isAbsolute()) {
                  final HttpHost httpHost = URIUtils.extractHost(requestURI);
                  if (httpHost == null) {
                      throw new ProtocolException("URI does not specify a valid host name: " + requestURI);
                  }
                  return httpHost;
              }
          } catch (final URISyntaxException ignore) {
          }
          return null;
      }
  
      public static HttpHost normalize(final HttpHost host, final SchemePortResolver schemePortResolver) {
          if (host == null) {
              return null;
          }
          if (host.getPort() < 0) {
              final int port = (schemePortResolver != null ? schemePortResolver: DefaultSchemePortResolver.INSTANCE).resolve(host);
              if (port > 0) {
                  return new HttpHost(host.getSchemeName(), host.getAddress(), host.getHostName(), port);
              }
          }
          return host;
      }
  
  }