/*
    * ====================================================================
    * 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.core5.http2.impl.nio.bootstrap;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import org.apache.hc.core5.function.Callback;
  import org.apache.hc.core5.function.Decorator;
  import org.apache.hc.core5.function.Supplier;
  import org.apache.hc.core5.http.config.CharCodingConfig;
  import org.apache.hc.core5.http.impl.DefaultAddressResolver;
  import org.apache.hc.core5.http.nio.AsyncPushConsumer;
  import org.apache.hc.core5.http.nio.ssl.TlsStrategy;
  import org.apache.hc.core5.http.protocol.HttpProcessor;
  import org.apache.hc.core5.http.protocol.RequestHandlerRegistry;
  import org.apache.hc.core5.http.protocol.UriPatternType;
  import org.apache.hc.core5.http2.config.H2Config;
  import org.apache.hc.core5.http2.impl.H2Processors;
  import org.apache.hc.core5.http2.impl.nio.ClientH2StreamMultiplexerFactory;
  import org.apache.hc.core5.http2.impl.nio.ClientH2PrefaceHandler;
  import org.apache.hc.core5.http2.impl.nio.H2StreamListener;
  import org.apache.hc.core5.http2.nio.support.DefaultAsyncPushConsumerFactory;
  import org.apache.hc.core5.http2.ssl.H2ClientTlsStrategy;
  import org.apache.hc.core5.reactor.IOReactorConfig;
  import org.apache.hc.core5.reactor.IOSession;
  import org.apache.hc.core5.reactor.IOSessionListener;
  import org.apache.hc.core5.util.Args;
  
  /**
   * {@link H2MultiplexingRequester} bootstrap.
   *
   * @since 5.0
   */
  public class H2MultiplexingRequesterBootstrap {
  
      private final List<HandlerEntry<Supplier<AsyncPushConsumer>>> pushConsumerList;
      private UriPatternType uriPatternType;
      private IOReactorConfig ioReactorConfig;
      private HttpProcessor httpProcessor;
      private CharCodingConfig charCodingConfig;
      private H2Config h2Config;
      private TlsStrategy tlsStrategy;
      private boolean strictALPNHandshake;
      private Decorator<IOSession> ioSessionDecorator;
      private Callback<Exception> exceptionCallback;
      private IOSessionListener sessionListener;
      private H2StreamListener streamListener;
  
      private H2MultiplexingRequesterBootstrap() {
          this.pushConsumerList = new ArrayList<>();
      }
  
      public static H2MultiplexingRequesterBootstrap bootstrap() {
          return new H2MultiplexingRequesterBootstrap();
      }
  
      /**
       * Sets I/O reactor configuration.
       */
      public final H2MultiplexingRequesterBootstrap setIOReactorConfig(final IOReactorConfig ioReactorConfig) {
          this.ioReactorConfig = ioReactorConfig;
          return this;
      }
  
      /**
       * Assigns {@link HttpProcessor} instance.
       */
      public final H2MultiplexingRequesterBootstrap setHttpProcessor(final HttpProcessor httpProcessor) {
          this.httpProcessor = httpProcessor;
          return this;
      }
  
      /**
       * Sets HTTP/2 protocol parameters
      */
     public final H2MultiplexingRequesterBootstrap setH2Config(final H2Config h2Config) {
         this.h2Config = h2Config;
         return this;
     }
 
     /**
      * Sets message char coding.
      */
     public final H2MultiplexingRequesterBootstrap setCharCodingConfig(final CharCodingConfig charCodingConfig) {
         this.charCodingConfig = charCodingConfig;
         return this;
     }
 
     /**
      * Assigns {@link TlsStrategy} instance.
      */
     public final H2MultiplexingRequesterBootstrap setTlsStrategy(final TlsStrategy tlsStrategy) {
         this.tlsStrategy = tlsStrategy;
         return this;
     }
 
     public final H2MultiplexingRequesterBootstrap setStrictALPNHandshake(final boolean strictALPNHandshake) {
         this.strictALPNHandshake = strictALPNHandshake;
         return this;
     }
 
     /**
      * Assigns {@link IOSession} {@link Decorator} instance.
      */
     public final H2MultiplexingRequesterBootstrap setIOSessionDecorator(final Decorator<IOSession> ioSessionDecorator) {
         this.ioSessionDecorator = ioSessionDecorator;
         return this;
     }
 
     /**
      * Assigns {@link Exception} {@link Callback} instance.
      */
     public final H2MultiplexingRequesterBootstrap setExceptionCallback(final Callback<Exception> exceptionCallback) {
         this.exceptionCallback = exceptionCallback;
         return this;
     }
 
     /**
      * Assigns {@link IOSessionListener} instance.
      */
     public final H2MultiplexingRequesterBootstrap setIOSessionListener(final IOSessionListener sessionListener) {
         this.sessionListener = sessionListener;
         return this;
     }
 
     /**
      * Assigns {@link H2StreamListener} instance.
      */
     public final H2MultiplexingRequesterBootstrap setStreamListener(final H2StreamListener streamListener) {
         this.streamListener = streamListener;
         return this;
     }
 
     /**
      * Assigns {@link UriPatternType} for handler registration.
      */
     public final H2MultiplexingRequesterBootstrap setUriPatternType(final UriPatternType uriPatternType) {
         this.uriPatternType = uriPatternType;
         return this;
     }
 
     /**
      * Registers the given {@link AsyncPushConsumer} {@link Supplier} as a default handler for URIs
      * matching the given pattern.
      *
      * @param uriPattern the pattern to register the handler for.
      * @param supplier the handler supplier.
      */
     public final H2MultiplexingRequesterBootstrap register(final String uriPattern, final Supplier<AsyncPushConsumer> supplier) {
         Args.notBlank(uriPattern, "URI pattern");
         Args.notNull(supplier, "Supplier");
         pushConsumerList.add(new HandlerEntry<>(null, uriPattern, supplier));
         return this;
     }
 
     /**
      * Registers the given {@link AsyncPushConsumer} {@link Supplier} as a handler for URIs
      * matching the given host and the pattern.
      *
      * @param hostname the host name
      * @param uriPattern the pattern to register the handler for.
      * @param supplier the handler supplier.
      */
     public final H2MultiplexingRequesterBootstrap registerVirtual(final String hostname, final String uriPattern, final Supplier<AsyncPushConsumer> supplier) {
         Args.notBlank(hostname, "Hostname");
         Args.notBlank(uriPattern, "URI pattern");
         Args.notNull(supplier, "Supplier");
         pushConsumerList.add(new HandlerEntry<>(hostname, uriPattern, supplier));
         return this;
     }
 
     public H2MultiplexingRequester create() {
         final RequestHandlerRegistry<Supplier<AsyncPushConsumer>> registry = new RequestHandlerRegistry<>(uriPatternType);
         for (final HandlerEntry<Supplier<AsyncPushConsumer>> entry: pushConsumerList) {
             registry.register(entry.hostname, entry.uriPattern, entry.handler);
         }
         final ClientH2StreamMultiplexerFactory http2StreamHandlerFactory = new ClientH2StreamMultiplexerFactory(
                 httpProcessor != null ? httpProcessor : H2Processors.client(),
                 new DefaultAsyncPushConsumerFactory(registry),
                 h2Config != null ? h2Config : H2Config.DEFAULT,
                 charCodingConfig != null ? charCodingConfig : CharCodingConfig.DEFAULT,
                 streamListener);
         return new H2MultiplexingRequester(
                 ioReactorConfig,
                 (ioSession, attachment) -> new ClientH2PrefaceHandler(ioSession, http2StreamHandlerFactory, strictALPNHandshake),
                 ioSessionDecorator,
                 exceptionCallback,
                 sessionListener,
                 DefaultAddressResolver.INSTANCE,
                 tlsStrategy != null ? tlsStrategy : new H2ClientTlsStrategy());
     }
 
 }