/*
    * 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.
   */
  package org.apache.commons.vfs2.provider.http4;
  
  import java.io.IOException;
  import java.net.URI;
  import java.util.Collection;
  
  import org.apache.commons.vfs2.Capability;
  import org.apache.commons.vfs2.FileName;
  import org.apache.commons.vfs2.FileObject;
  import org.apache.commons.vfs2.FileSystemOptions;
  import org.apache.commons.vfs2.provider.AbstractFileName;
  import org.apache.commons.vfs2.provider.AbstractFileSystem;
  import org.apache.http.client.HttpClient;
  import org.apache.http.client.protocol.HttpClientContext;
  import org.apache.http.impl.client.CloseableHttpClient;
  
  /**
   * http4 file system.
   *
   * @since 2.3
   */
  public class Http4FileSystem extends AbstractFileSystem {
  
      /**
       * Internal base URI of this file system.
       */
      private final URI internalBaseURI;
  
      /**
       * Internal {@code HttpClient} instance of this file system.
       */
      private final HttpClient httpClient;
  
      /**
       * Internal {@code HttpClientContext} instance of this file system.
       */
      private final HttpClientContext httpClientContext;
  
      /**
       * Construct {@code Http4FileSystem}.
       *
       * @param rootName root base name
       * @param fileSystemOptions file system options
       * @param httpClient {@link HttpClient} instance
       * @param httpClientContext {@link HttpClientContext} instance
       */
      protected Http4FileSystem(final FileName rootName, final FileSystemOptions fileSystemOptions, final HttpClient httpClient,
              final HttpClientContext httpClientContext) {
          super(rootName, null, fileSystemOptions);
  
          final String rootURI = getRootURI();
          final int offset = rootURI.indexOf(':');
          final char lastCharOfScheme = (offset > 0) ? rootURI.charAt(offset - 1) : 0;
  
          // if scheme is 'http*s' or 'HTTP*S', then the internal base URI should be 'https'. 'http' otherwise.
          if (lastCharOfScheme == 's' || lastCharOfScheme == 'S') {
              this.internalBaseURI = URI.create("https" + rootURI.substring(offset));
          } else {
              this.internalBaseURI = URI.create("http" + rootURI.substring(offset));
          }
  
          this.httpClient = httpClient;
          this.httpClientContext = httpClientContext;
      }
  
      @Override
      protected void addCapabilities(final Collection<Capability> caps) {
          caps.addAll(Http4FileProvider.CAPABILITIES);
      }
  
      @Override
      protected FileObject createFile(final AbstractFileName name) throws Exception {
          return new Http4FileObject<>(name, this);
      }
  
      @Override
      protected void doCloseCommunicationLink() {
          if (httpClient instanceof CloseableHttpClient) {
              try {
                  ((CloseableHttpClient) httpClient).close();
              } catch (final IOException e) {
                  throw new RuntimeException("Error closing HttpClient", e);
              }
         }
     }
 
     /**
      * Return the internal {@link HttpClient} instance.
      *
      * @return the internal {@link HttpClient} instance
      */
     protected HttpClient getHttpClient() {
         return httpClient;
     }
 
     /**
      * Return the internal {@link HttpClientContext} instance.
      *
      * @return the internal {@link HttpClientContext} instance
      */
     protected HttpClientContext getHttpClientContext() {
         return httpClientContext;
     }
 
     /**
      * Return the internal base {@code URI} instance.
      *
      * @return the internal base {@code URI} instance
      */
     protected URI getInternalBaseURI() {
         return internalBaseURI;
     }
 }