/*
    * ====================================================================
    * 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.annotation.Experimental;
  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.HttpHost;
  import org.apache.hc.core5.http.config.CharCodingConfig;
  import org.apache.hc.core5.http.config.Http1Config;
  import org.apache.hc.core5.http.impl.Http1StreamListener;
  import org.apache.hc.core5.http.impl.HttpProcessors;
  import org.apache.hc.core5.http.impl.nio.ClientHttp1StreamDuplexerFactory;
  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.HttpVersionPolicy;
  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.ClientHttpProtocolNegotiatorFactory;
  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.pool.ConnPoolListener;
  import org.apache.hc.core5.pool.DefaultDisposalCallback;
  import org.apache.hc.core5.pool.LaxConnPool;
  import org.apache.hc.core5.pool.ManagedConnPool;
  import org.apache.hc.core5.pool.PoolConcurrencyPolicy;
  import org.apache.hc.core5.pool.PoolReusePolicy;
  import org.apache.hc.core5.pool.StrictConnPool;
  import org.apache.hc.core5.reactor.IOEventHandlerFactory;
  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;
  import org.apache.hc.core5.util.TimeValue;
  import org.apache.hc.core5.util.Timeout;
  
  /**
   * {@link H2AsyncRequester} bootstrap.
   *
   * @since 5.0
   */
  public class H2RequesterBootstrap {
  
      private final List<HandlerEntry<Supplier<AsyncPushConsumer>>> pushConsumerList;
      private UriPatternType uriPatternType;
      private IOReactorConfig ioReactorConfig;
      private HttpProcessor httpProcessor;
      private CharCodingConfig charCodingConfig;
      private HttpVersionPolicy versionPolicy;
      private H2Config h2Config;
      private Http1Config http1Config;
      private int defaultMaxPerRoute;
      private int maxTotal;
      private TimeValue timeToLive;
      private PoolReusePolicy poolReusePolicy;
      private PoolConcurrencyPolicy poolConcurrencyPolicy;
      private TlsStrategy tlsStrategy;
      private Timeout handshakeTimeout;
      private Decorator<IOSession> ioSessionDecorator;
      private Callback<Exception> exceptionCallback;
      private IOSessionListener sessionListener;
      private H2StreamListener streamListener;
      private Http1StreamListener http1StreamListener;
      private ConnPoolListener<HttpHost> connPoolListener;
  
      private H2RequesterBootstrap() {
         this.pushConsumerList = new ArrayList<>();
     }
 
     public static H2RequesterBootstrap bootstrap() {
         return new H2RequesterBootstrap();
     }
 
     /**
      * Sets I/O reactor configuration.
      */
     public final H2RequesterBootstrap setIOReactorConfig(final IOReactorConfig ioReactorConfig) {
         this.ioReactorConfig = ioReactorConfig;
         return this;
     }
 
     /**
      * Assigns {@link HttpProcessor} instance.
      */
     public final H2RequesterBootstrap setHttpProcessor(final HttpProcessor httpProcessor) {
         this.httpProcessor = httpProcessor;
         return this;
     }
 
     /**
      * Sets HTTP protocol version policy
      */
     public final H2RequesterBootstrap setVersionPolicy(final HttpVersionPolicy versionPolicy) {
         this.versionPolicy = versionPolicy;
         return this;
     }
 
     /**
      * Sets HTTP/2 protocol parameters
      */
     public final H2RequesterBootstrap setH2Config(final H2Config h2Config) {
         this.h2Config = h2Config;
         return this;
     }
 
     /**
      * Sets HTTP/1.1 protocol parameters
      */
     public final H2RequesterBootstrap setHttp1Config(final Http1Config http1Config) {
         this.http1Config = http1Config;
         return this;
     }
 
     /**
      * Sets message char coding.
      */
     public final H2RequesterBootstrap setCharCodingConfig(final CharCodingConfig charCodingConfig) {
         this.charCodingConfig = charCodingConfig;
         return this;
     }
 
     public final H2RequesterBootstrap setDefaultMaxPerRoute(final int defaultMaxPerRoute) {
         this.defaultMaxPerRoute = defaultMaxPerRoute;
         return this;
     }
 
     public final H2RequesterBootstrap setMaxTotal(final int maxTotal) {
         this.maxTotal = maxTotal;
         return this;
     }
 
     public final H2RequesterBootstrap setTimeToLive(final TimeValue timeToLive) {
         this.timeToLive = timeToLive;
         return this;
     }
 
     /**
      * Assigns {@link PoolReusePolicy} instance.
      */
     public final H2RequesterBootstrap setPoolReusePolicy(final PoolReusePolicy poolReusePolicy) {
         this.poolReusePolicy = poolReusePolicy;
         return this;
     }
 
     /**
      * Assigns {@link PoolConcurrencyPolicy} instance.
      */
     @Experimental
     public final H2RequesterBootstrap setPoolConcurrencyPolicy(final PoolConcurrencyPolicy poolConcurrencyPolicy) {
         this.poolConcurrencyPolicy = poolConcurrencyPolicy;
         return this;
     }
 
     /**
      * Assigns {@link TlsStrategy} instance.
      */
     public final H2RequesterBootstrap setTlsStrategy(final TlsStrategy tlsStrategy) {
         this.tlsStrategy = tlsStrategy;
         return this;
     }
 
     public final H2RequesterBootstrap setHandshakeTimeout(final Timeout handshakeTimeout) {
         this.handshakeTimeout = handshakeTimeout;
         return this;
     }
 
     /**
      * Assigns {@link IOSession} {@link Decorator} instance.
      */
     public final H2RequesterBootstrap setIOSessionDecorator(final Decorator<IOSession> ioSessionDecorator) {
         this.ioSessionDecorator = ioSessionDecorator;
         return this;
     }
 
     /**
      * Assigns {@link Exception} {@link Callback} instance.
      */
     public final H2RequesterBootstrap setExceptionCallback(final Callback<Exception> exceptionCallback) {
         this.exceptionCallback = exceptionCallback;
         return this;
     }
 
     /**
      * Assigns {@link IOSessionListener} instance.
      */
     public final H2RequesterBootstrap setIOSessionListener(final IOSessionListener sessionListener) {
         this.sessionListener = sessionListener;
         return this;
     }
 
     /**
      * Assigns {@link H2StreamListener} instance.
      */
     public final H2RequesterBootstrap setStreamListener(final H2StreamListener streamListener) {
         this.streamListener = streamListener;
         return this;
     }
 
     /**
      * Assigns {@link Http1StreamListener} instance.
      */
     public final H2RequesterBootstrap setStreamListener(final Http1StreamListener http1StreamListener) {
         this.http1StreamListener = http1StreamListener;
         return this;
     }
 
     /**
      * Assigns {@link ConnPoolListener} instance.
      */
     public final H2RequesterBootstrap setConnPoolListener(final ConnPoolListener<HttpHost> connPoolListener) {
         this.connPoolListener = connPoolListener;
         return this;
     }
 
     /**
      * Assigns {@link UriPatternType} for handler registration.
      */
     public final H2RequesterBootstrap 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 H2RequesterBootstrap 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 H2RequesterBootstrap 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 H2AsyncRequester create() {
         final ManagedConnPool<HttpHost, IOSession> connPool;
         switch (poolConcurrencyPolicy != null ? poolConcurrencyPolicy : PoolConcurrencyPolicy.STRICT) {
             case LAX:
                 connPool = new LaxConnPool<>(
                         defaultMaxPerRoute > 0 ? defaultMaxPerRoute : 20,
                         timeToLive,
                         poolReusePolicy,
                         new DefaultDisposalCallback<IOSession>(),
                         connPoolListener);
                 break;
             case STRICT:
             default:
                 connPool = new StrictConnPool<>(
                         defaultMaxPerRoute > 0 ? defaultMaxPerRoute : 20,
                         maxTotal > 0 ? maxTotal : 50,
                         timeToLive,
                         poolReusePolicy,
                         new DefaultDisposalCallback<IOSession>(),
                         connPoolListener);
                 break;
         }
         final RequestHandlerRegistry<Supplier<AsyncPushConsumer>> registry = new RequestHandlerRegistry<>(uriPatternType);
         for (final HandlerEntry<Supplier<AsyncPushConsumer>> entry: pushConsumerList) {
             registry.register(entry.hostname, entry.uriPattern, entry.handler);
         }
         final ClientHttp1StreamDuplexerFactoryctory.html#ClientHttp1StreamDuplexerFactory">ClientHttp1StreamDuplexerFactory http1StreamHandlerFactory = new ClientHttp1StreamDuplexerFactory(
                 httpProcessor != null ? httpProcessor : HttpProcessors.client(),
                 http1Config != null ? http1Config : Http1Config.DEFAULT,
                 charCodingConfig != null ? charCodingConfig : CharCodingConfig.DEFAULT,
                 http1StreamListener);
         final ClientH2StreamMultiplexerFactoryactory.html#ClientH2StreamMultiplexerFactory">ClientH2StreamMultiplexerFactory http2StreamHandlerFactory = new ClientH2StreamMultiplexerFactory(
                 httpProcessor != null ? httpProcessor : H2Processors.client(),
                 new DefaultAsyncPushConsumerFactory(registry),
                 h2Config != null ? h2Config : H2Config.DEFAULT,
                 charCodingConfig != null ? charCodingConfig : CharCodingConfig.DEFAULT,
                 streamListener);
         final IOEventHandlerFactory ioEventHandlerFactory = new ClientHttpProtocolNegotiatorFactory(
                 http1StreamHandlerFactory,
                 http2StreamHandlerFactory,
                 versionPolicy != null ? versionPolicy : HttpVersionPolicy.NEGOTIATE,
                 tlsStrategy != null ? tlsStrategy : new H2ClientTlsStrategy(),
                 handshakeTimeout);
         return new H2AsyncRequester(
                 versionPolicy != null ? versionPolicy : HttpVersionPolicy.NEGOTIATE,
                 ioReactorConfig,
                 ioEventHandlerFactory,
                 ioSessionDecorator,
                 exceptionCallback,
                 sessionListener,
                 connPool);
     }
 
 }