/*
    * ====================================================================
    * 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.impl.async;
  
  import java.util.Locale;
  import java.util.concurrent.ConcurrentHashMap;
  import java.util.concurrent.ConcurrentMap;
  
  import org.apache.hc.core5.function.Supplier;
  import org.apache.hc.core5.http.HttpRequest;
  import org.apache.hc.core5.http.nio.AsyncPushConsumer;
  import org.apache.hc.core5.http.protocol.UriPatternMatcher;
  import org.apache.hc.core5.net.URIAuthority;
  import org.apache.hc.core5.util.Args;
  
  class AsyncPushConsumerRegistry {
  
      private final UriPatternMatcher<Supplier<AsyncPushConsumer>> primary;
      private final ConcurrentMap<String, UriPatternMatcher<Supplier<AsyncPushConsumer>>> hostMap;
  
      public AsyncPushConsumerRegistry() {
          this.primary = new UriPatternMatcher<>();
          this.hostMap = new ConcurrentHashMap<>();
      }
  
      private UriPatternMatcher<Supplier<AsyncPushConsumer>> getPatternMatcher(final String hostname) {
          if (hostname == null) {
              return primary;
          }
          final UriPatternMatcher<Supplier<AsyncPushConsumer>> hostMatcher = hostMap.get(hostname);
          if (hostMatcher != null) {
              return hostMatcher;
          }
          return primary;
      }
  
      public AsyncPushConsumer get(final HttpRequest request) {
          Args.notNull(request, "Request");
          final URIAuthority authority = request.getAuthority();
          final String key = authority != null ? authority.getHostName().toLowerCase(Locale.ROOT) : null;
          final UriPatternMatcher<Supplier<AsyncPushConsumer>> patternMatcher = getPatternMatcher(key);
          if (patternMatcher == null) {
              return null;
          }
          String path = request.getPath();
          final int i = path.indexOf('?');
          if (i != -1) {
              path = path.substring(0, i);
          }
          final Supplier<AsyncPushConsumer> supplier = patternMatcher.lookup(path);
          return supplier != null ? supplier.get() : null;
      }
  
      public void register(final String hostname, final String uriPattern, final Supplier<AsyncPushConsumer> supplier) {
          Args.notBlank(uriPattern, "URI pattern");
          Args.notNull(supplier, "Supplier");
          if (hostname == null) {
              primary.register(uriPattern, supplier);
          } else {
              final String key = hostname.toLowerCase(Locale.ROOT);
              UriPatternMatcher<Supplier<AsyncPushConsumer>> matcher = hostMap.get(key);
              if (matcher == null) {
                  final UriPatternMatcher<Supplier<AsyncPushConsumer>> newMatcher = new UriPatternMatcher<>();
                  matcher = hostMap.putIfAbsent(key, newMatcher);
                  if (matcher == null) {
                      matcher = newMatcher;
                  }
              }
              matcher.register(uriPattern, supplier);
          }
      }
  
  }