/*
 * Copyright 2010 Ning, Inc.
 *
 * This program is licensed 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.asynchttpclient;

import io.netty.buffer.ByteBufAllocator;
import io.netty.channel.Channel;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.handler.ssl.SslContext;
import io.netty.util.Timer;
import org.asynchttpclient.channel.ChannelPool;
import org.asynchttpclient.channel.DefaultKeepAliveStrategy;
import org.asynchttpclient.channel.KeepAliveStrategy;
import org.asynchttpclient.config.AsyncHttpClientConfigDefaults;
import org.asynchttpclient.cookie.CookieStore;
import org.asynchttpclient.cookie.ThreadSafeCookieStore;
import org.asynchttpclient.filter.IOExceptionFilter;
import org.asynchttpclient.filter.RequestFilter;
import org.asynchttpclient.filter.ResponseFilter;
import org.asynchttpclient.netty.channel.ConnectionSemaphoreFactory;
import org.asynchttpclient.proxy.ProxyServer;
import org.asynchttpclient.proxy.ProxyServerSelector;
import org.asynchttpclient.util.ProxyUtils;

import java.util.*;
import java.util.concurrent.ThreadFactory;
import java.util.function.Consumer;

import static org.asynchttpclient.config.AsyncHttpClientConfigDefaults.*;

/**
 * Configuration class to use with a {@link AsyncHttpClient}. System property can be also used to configure this object default behavior by doing: <br>
 * -Dorg.asynchttpclient.nameOfTheProperty
 *
 * @see AsyncHttpClientConfig for documentation
 */
public class DefaultAsyncHttpClientConfig implements AsyncHttpClientConfig {

  // http
  private final boolean followRedirect;
  private final int maxRedirects;
  private final boolean strict302Handling;
  private final boolean compressionEnforced;
  private final String userAgent;
  private final Realm realm;
  private final int maxRequestRetry;
  private final boolean disableUrlEncodingForBoundRequests;
  private final boolean useLaxCookieEncoder;
  private final boolean disableZeroCopy;
  private final boolean keepEncodingHeader;
  private final ProxyServerSelector proxyServerSelector;
  private final boolean validateResponseHeaders;

  // websockets
  private final boolean aggregateWebSocketFrameFragments;
  private final boolean enablewebSocketCompression;
  private final int webSocketMaxBufferSize;
  private final int webSocketMaxFrameSize;

  // timeouts
  private final int connectTimeout;
  private final int requestTimeout;
  private final int readTimeout;
  private final int shutdownQuietPeriod;
  private final int shutdownTimeout;

  // keep-alive
  private final boolean keepAlive;
  private final int pooledConnectionIdleTimeout;
  private final int connectionPoolCleanerPeriod;
  private final int connectionTtl;
  private final int maxConnections;
  private final int maxConnectionsPerHost;
  private final ChannelPool channelPool;
  private final ConnectionSemaphoreFactory connectionSemaphoreFactory;
  private final KeepAliveStrategy keepAliveStrategy;

  // ssl
  private final boolean useOpenSsl;
  private final boolean useInsecureTrustManager;
  private final boolean disableHttpsEndpointIdentificationAlgorithm;
  private final int handshakeTimeout;
  private final String[] enabledProtocols;
  private final String[] enabledCipherSuites;
  private final boolean filterInsecureCipherSuites;
  private final int sslSessionCacheSize;
  private final int sslSessionTimeout;
  private final SslContext sslContext;
  private final SslEngineFactory sslEngineFactory;

  // filters
  private final List<RequestFilter> requestFilters;
  private final List<ResponseFilter> responseFilters;
  private final List<IOExceptionFilter> ioExceptionFilters;

  // cookie store
  private final CookieStore cookieStore;

  // internals
  private final String threadPoolName;
  private final int httpClientCodecMaxInitialLineLength;
  private final int httpClientCodecMaxHeaderSize;
  private final int httpClientCodecMaxChunkSize;
  private final int httpClientCodecInitialBufferSize;
  private final int chunkedFileChunkSize;
  private final Map<ChannelOption<Object>, Object> channelOptions;
  private final EventLoopGroup eventLoopGroup;
  private final boolean useNativeTransport;
  private final ByteBufAllocator allocator;
  private final boolean tcpNoDelay;
  private final boolean soReuseAddress;
  private final int soLinger;
  private final int soSndBuf;
  private final int soRcvBuf;
  private final Timer nettyTimer;
  private final ThreadFactory threadFactory;
  private final Consumer<Channel> httpAdditionalChannelInitializer;
  private final Consumer<Channel> wsAdditionalChannelInitializer;
  private final ResponseBodyPartFactory responseBodyPartFactory;
  private final int ioThreadsCount;

  private DefaultAsyncHttpClientConfig(// http
                                       boolean followRedirect,
                                       int maxRedirects,
                                       boolean strict302Handling,
                                       boolean compressionEnforced,
                                       String userAgent,
                                       Realm realm,
                                       int maxRequestRetry,
                                       boolean disableUrlEncodingForBoundRequests,
                                       boolean useLaxCookieEncoder,
                                       boolean disableZeroCopy,
                                       boolean keepEncodingHeader,
                                       ProxyServerSelector proxyServerSelector,
                                       boolean validateResponseHeaders,
                                       boolean aggregateWebSocketFrameFragments,
                                       boolean enablewebSocketCompression,

                                       // timeouts
                                       int connectTimeout,
                                       int requestTimeout,
                                       int readTimeout,
                                       int shutdownQuietPeriod,
                                       int shutdownTimeout,

                                       // keep-alive
                                       boolean keepAlive,
                                       int pooledConnectionIdleTimeout,
                                       int connectionPoolCleanerPeriod,
                                       int connectionTtl,
                                       int maxConnections,
                                       int maxConnectionsPerHost,
                                       ChannelPool channelPool,
                                       ConnectionSemaphoreFactory connectionSemaphoreFactory,
                                       KeepAliveStrategy keepAliveStrategy,

                                       // ssl
                                       boolean useOpenSsl,
                                       boolean useInsecureTrustManager,
                                       boolean disableHttpsEndpointIdentificationAlgorithm,
                                       int handshakeTimeout,
                                       String[] enabledProtocols,
                                       String[] enabledCipherSuites,
                                       boolean filterInsecureCipherSuites,
                                       int sslSessionCacheSize,
                                       int sslSessionTimeout,
                                       SslContext sslContext,
                                       SslEngineFactory sslEngineFactory,

                                       // filters
                                       List<RequestFilter> requestFilters,
                                       List<ResponseFilter> responseFilters,
                                       List<IOExceptionFilter> ioExceptionFilters,

                                       // cookie store
                                       CookieStore cookieStore,

                                       // tuning
                                       boolean tcpNoDelay,
                                       boolean soReuseAddress,
                                       int soLinger,
                                       int soSndBuf,
                                       int soRcvBuf,

                                       // internals
                                       String threadPoolName,
                                       int httpClientCodecMaxInitialLineLength,
                                       int httpClientCodecMaxHeaderSize,
                                       int httpClientCodecMaxChunkSize,
                                       int httpClientCodecInitialBufferSize,
                                       int chunkedFileChunkSize,
                                       int webSocketMaxBufferSize,
                                       int webSocketMaxFrameSize,
                                       Map<ChannelOption<Object>, Object> channelOptions,
                                       EventLoopGroup eventLoopGroup,
                                       boolean useNativeTransport,
                                       ByteBufAllocator allocator,
                                       Timer nettyTimer,
                                       ThreadFactory threadFactory,
                                       Consumer<Channel> httpAdditionalChannelInitializer,
                                       Consumer<Channel> wsAdditionalChannelInitializer,
                                       ResponseBodyPartFactory responseBodyPartFactory,
                                       int ioThreadsCount) {

    // http
    this.followRedirect = followRedirect;
    this.maxRedirects = maxRedirects;
    this.strict302Handling = strict302Handling;
    this.compressionEnforced = compressionEnforced;
    this.userAgent = userAgent;
    this.realm = realm;
    this.maxRequestRetry = maxRequestRetry;
    this.disableUrlEncodingForBoundRequests = disableUrlEncodingForBoundRequests;
    this.useLaxCookieEncoder = useLaxCookieEncoder;
    this.disableZeroCopy = disableZeroCopy;
    this.keepEncodingHeader = keepEncodingHeader;
    this.proxyServerSelector = proxyServerSelector;
    this.validateResponseHeaders = validateResponseHeaders;

    // websocket
    this.aggregateWebSocketFrameFragments = aggregateWebSocketFrameFragments;
    this.enablewebSocketCompression = enablewebSocketCompression;
    this.webSocketMaxBufferSize = webSocketMaxBufferSize;
    this.webSocketMaxFrameSize = webSocketMaxFrameSize;

    // timeouts
    this.connectTimeout = connectTimeout;
    this.requestTimeout = requestTimeout;
    this.readTimeout = readTimeout;
    this.shutdownQuietPeriod = shutdownQuietPeriod;
    this.shutdownTimeout = shutdownTimeout;

    // keep-alive
    this.keepAlive = keepAlive;
    this.pooledConnectionIdleTimeout = pooledConnectionIdleTimeout;
    this.connectionPoolCleanerPeriod = connectionPoolCleanerPeriod;
    this.connectionTtl = connectionTtl;
    this.maxConnections = maxConnections;
    this.maxConnectionsPerHost = maxConnectionsPerHost;
    this.channelPool = channelPool;
    this.connectionSemaphoreFactory = connectionSemaphoreFactory;
    this.keepAliveStrategy = keepAliveStrategy;

    // ssl
    this.useOpenSsl = useOpenSsl;
    this.useInsecureTrustManager = useInsecureTrustManager;
    this.disableHttpsEndpointIdentificationAlgorithm = disableHttpsEndpointIdentificationAlgorithm;
    this.handshakeTimeout = handshakeTimeout;
    this.enabledProtocols = enabledProtocols;
    this.enabledCipherSuites = enabledCipherSuites;
    this.filterInsecureCipherSuites = filterInsecureCipherSuites;
    this.sslSessionCacheSize = sslSessionCacheSize;
    this.sslSessionTimeout = sslSessionTimeout;
    this.sslContext = sslContext;
    this.sslEngineFactory = sslEngineFactory;

    // filters
    this.requestFilters = requestFilters;
    this.responseFilters = responseFilters;
    this.ioExceptionFilters = ioExceptionFilters;

    // cookie store
    this.cookieStore = cookieStore;

    // tuning
    this.tcpNoDelay = tcpNoDelay;
    this.soReuseAddress = soReuseAddress;
    this.soLinger = soLinger;
    this.soSndBuf = soSndBuf;
    this.soRcvBuf = soRcvBuf;

    // internals
    this.threadPoolName = threadPoolName;
    this.httpClientCodecMaxInitialLineLength = httpClientCodecMaxInitialLineLength;
    this.httpClientCodecMaxHeaderSize = httpClientCodecMaxHeaderSize;
    this.httpClientCodecMaxChunkSize = httpClientCodecMaxChunkSize;
    this.httpClientCodecInitialBufferSize = httpClientCodecInitialBufferSize;
    this.chunkedFileChunkSize = chunkedFileChunkSize;
    this.channelOptions = channelOptions;
    this.eventLoopGroup = eventLoopGroup;
    this.useNativeTransport = useNativeTransport;
    this.allocator = allocator;
    this.nettyTimer = nettyTimer;
    this.threadFactory = threadFactory;
    this.httpAdditionalChannelInitializer = httpAdditionalChannelInitializer;
    this.wsAdditionalChannelInitializer = wsAdditionalChannelInitializer;
    this.responseBodyPartFactory = responseBodyPartFactory;
    this.ioThreadsCount = ioThreadsCount;
  }

  @Override
  public String getAhcVersion() {
    return AsyncHttpClientConfigDefaults.AHC_VERSION;
  }

  // http
  @Override
  public boolean isFollowRedirect() {
    return followRedirect;
  }

  @Override
  public int getMaxRedirects() {
    return maxRedirects;
  }

  @Override
  public boolean isStrict302Handling() {
    return strict302Handling;
  }

  @Override
  public boolean isCompressionEnforced() {
    return compressionEnforced;
  }

  @Override
  public String getUserAgent() {
    return userAgent;
  }

  @Override
  public Realm getRealm() {
    return realm;
  }

  @Override
  public int getMaxRequestRetry() {
    return maxRequestRetry;
  }

  @Override
  public boolean isDisableUrlEncodingForBoundRequests() {
    return disableUrlEncodingForBoundRequests;
  }

  @Override
  public boolean isUseLaxCookieEncoder() {
    return useLaxCookieEncoder;
  }

  @Override
  public boolean isDisableZeroCopy() {
    return disableZeroCopy;
  }

  @Override
  public boolean isKeepEncodingHeader() {
    return keepEncodingHeader;
  }

  @Override
  public ProxyServerSelector getProxyServerSelector() {
    return proxyServerSelector;
  }

  // websocket
  @Override
  public boolean isAggregateWebSocketFrameFragments() {
    return aggregateWebSocketFrameFragments;
  }

  @Override
  public boolean isEnableWebSocketCompression() {
    return enablewebSocketCompression;
  }

  @Override
  public int getWebSocketMaxBufferSize() {
    return webSocketMaxBufferSize;
  }

  @Override
  public int getWebSocketMaxFrameSize() {
    return webSocketMaxFrameSize;
  }

  // timeouts
  @Override
  public int getConnectTimeout() {
    return connectTimeout;
  }

  @Override
  public int getRequestTimeout() {
    return requestTimeout;
  }

  @Override
  public int getReadTimeout() {
    return readTimeout;
  }

  @Override
  public int getShutdownQuietPeriod() {
    return shutdownQuietPeriod;
  }

  @Override
  public int getShutdownTimeout() {
    return shutdownTimeout;
  }

  // keep-alive
  @Override
  public boolean isKeepAlive() {
    return keepAlive;
  }

  @Override
  public int getPooledConnectionIdleTimeout() {
    return pooledConnectionIdleTimeout;
  }

  @Override
  public int getConnectionPoolCleanerPeriod() {
    return connectionPoolCleanerPeriod;
  }

  @Override
  public int getConnectionTtl() {
    return connectionTtl;
  }

  @Override
  public int getMaxConnections() {
    return maxConnections;
  }

  @Override
  public int getMaxConnectionsPerHost() {
    return maxConnectionsPerHost;
  }

  @Override
  public ChannelPool getChannelPool() {
    return channelPool;
  }

  @Override
  public ConnectionSemaphoreFactory getConnectionSemaphoreFactory() {
    return connectionSemaphoreFactory;
  }

  @Override
  public KeepAliveStrategy getKeepAliveStrategy() {
    return keepAliveStrategy;
  }

  @Override
  public boolean isValidateResponseHeaders() {
    return validateResponseHeaders;
  }

  // ssl
  @Override
  public boolean isUseOpenSsl() {
    return useOpenSsl;
  }

  @Override
  public boolean isUseInsecureTrustManager() {
    return useInsecureTrustManager;
  }

  @Override
  public boolean isDisableHttpsEndpointIdentificationAlgorithm() {
    return disableHttpsEndpointIdentificationAlgorithm;
  }

  @Override
  public int getHandshakeTimeout() {
    return handshakeTimeout;
  }

  @Override
  public String[] getEnabledProtocols() {
    return enabledProtocols;
  }

  @Override
  public String[] getEnabledCipherSuites() {
    return enabledCipherSuites;
  }

  @Override
  public boolean isFilterInsecureCipherSuites() {
    return filterInsecureCipherSuites;
  }

  @Override
  public int getSslSessionCacheSize() {
    return sslSessionCacheSize;
  }

  @Override
  public int getSslSessionTimeout() {
    return sslSessionTimeout;
  }

  @Override
  public SslContext getSslContext() {
    return sslContext;
  }

  @Override
  public SslEngineFactory getSslEngineFactory() {
    return sslEngineFactory;
  }

  // filters
  @Override
  public List<RequestFilter> getRequestFilters() {
    return requestFilters;
  }

  @Override
  public List<ResponseFilter> getResponseFilters() {
    return responseFilters;
  }

  @Override
  public List<IOExceptionFilter> getIoExceptionFilters() {
    return ioExceptionFilters;
  }

  // cookie store
  @Override
  public CookieStore getCookieStore() {
    return cookieStore;
  }

  // tuning
  @Override
  public boolean isTcpNoDelay() {
    return tcpNoDelay;
  }

  @Override
  public boolean isSoReuseAddress() {
    return soReuseAddress;
  }

  @Override
  public int getSoLinger() {
    return soLinger;
  }

  @Override
  public int getSoSndBuf() {
    return soSndBuf;
  }

  @Override
  public int getSoRcvBuf() {
    return soRcvBuf;
  }

  // internals
  @Override
  public String getThreadPoolName() {
    return threadPoolName;
  }

  @Override
  public int getHttpClientCodecMaxInitialLineLength() {
    return httpClientCodecMaxInitialLineLength;
  }

  @Override
  public int getHttpClientCodecMaxHeaderSize() {
    return httpClientCodecMaxHeaderSize;
  }

  @Override
  public int getHttpClientCodecMaxChunkSize() {
    return httpClientCodecMaxChunkSize;
  }

  @Override
  public int getHttpClientCodecInitialBufferSize() {
    return httpClientCodecInitialBufferSize;
  }

  @Override
  public int getChunkedFileChunkSize() {
    return chunkedFileChunkSize;
  }

  @Override
  public Map<ChannelOption<Object>, Object> getChannelOptions() {
    return channelOptions;
  }

  @Override
  public EventLoopGroup getEventLoopGroup() {
    return eventLoopGroup;
  }

  @Override
  public boolean isUseNativeTransport() {
    return useNativeTransport;
  }

  @Override
  public ByteBufAllocator getAllocator() {
    return allocator;
  }

  @Override
  public Timer getNettyTimer() {
    return nettyTimer;
  }

  @Override
  public ThreadFactory getThreadFactory() {
    return threadFactory;
  }

  @Override
  public Consumer<Channel> getHttpAdditionalChannelInitializer() {
    return httpAdditionalChannelInitializer;
  }

  @Override
  public Consumer<Channel> getWsAdditionalChannelInitializer() {
    return wsAdditionalChannelInitializer;
  }

  @Override
  public ResponseBodyPartFactory getResponseBodyPartFactory() {
    return responseBodyPartFactory;
  }

  @Override
  public int getIoThreadsCount() {
    return ioThreadsCount;
  }

  /**
   * Builder for an {@link AsyncHttpClient}
   */
  public static class Builder {

    // filters
    private final List<RequestFilter> requestFilters = new LinkedList<>();
    private final List<ResponseFilter> responseFilters = new LinkedList<>();
    private final List<IOExceptionFilter> ioExceptionFilters = new LinkedList<>();
    // http
    private boolean followRedirect = defaultFollowRedirect();
    private int maxRedirects = defaultMaxRedirects();
    private boolean strict302Handling = defaultStrict302Handling();
    private boolean compressionEnforced = defaultCompressionEnforced();
    private String userAgent = defaultUserAgent();
    private Realm realm;
    private int maxRequestRetry = defaultMaxRequestRetry();
    private boolean disableUrlEncodingForBoundRequests = defaultDisableUrlEncodingForBoundRequests();
    private boolean useLaxCookieEncoder = defaultUseLaxCookieEncoder();
    private boolean disableZeroCopy = defaultDisableZeroCopy();
    private boolean keepEncodingHeader = defaultKeepEncodingHeader();
    private ProxyServerSelector proxyServerSelector;
    private boolean useProxySelector = defaultUseProxySelector();
    private boolean useProxyProperties = defaultUseProxyProperties();
    private boolean validateResponseHeaders = defaultValidateResponseHeaders();

    // websocket
    private boolean aggregateWebSocketFrameFragments = defaultAggregateWebSocketFrameFragments();
    private boolean enablewebSocketCompression = defaultEnableWebSocketCompression();
    private int webSocketMaxBufferSize = defaultWebSocketMaxBufferSize();
    private int webSocketMaxFrameSize = defaultWebSocketMaxFrameSize();

    // timeouts
    private int connectTimeout = defaultConnectTimeout();
    private int requestTimeout = defaultRequestTimeout();
    private int readTimeout = defaultReadTimeout();
    private int shutdownQuietPeriod = defaultShutdownQuietPeriod();
    private int shutdownTimeout = defaultShutdownTimeout();

    // keep-alive
    private boolean keepAlive = defaultKeepAlive();
    private int pooledConnectionIdleTimeout = defaultPooledConnectionIdleTimeout();
    private int connectionPoolCleanerPeriod = defaultConnectionPoolCleanerPeriod();
    private int connectionTtl = defaultConnectionTtl();
    private int maxConnections = defaultMaxConnections();
    private int maxConnectionsPerHost = defaultMaxConnectionsPerHost();
    private ChannelPool channelPool;
    private ConnectionSemaphoreFactory connectionSemaphoreFactory;
    private KeepAliveStrategy keepAliveStrategy = new DefaultKeepAliveStrategy();

    // ssl
    private boolean useOpenSsl = defaultUseOpenSsl();
    private boolean useInsecureTrustManager = defaultUseInsecureTrustManager();
    private boolean disableHttpsEndpointIdentificationAlgorithm = defaultDisableHttpsEndpointIdentificationAlgorithm();
    private int handshakeTimeout = defaultHandshakeTimeout();
    private String[] enabledProtocols = defaultEnabledProtocols();
    private String[] enabledCipherSuites = defaultEnabledCipherSuites();
    private boolean filterInsecureCipherSuites = defaultFilterInsecureCipherSuites();
    private int sslSessionCacheSize = defaultSslSessionCacheSize();
    private int sslSessionTimeout = defaultSslSessionTimeout();
    private SslContext sslContext;
    private SslEngineFactory sslEngineFactory;

    // cookie store
    private CookieStore cookieStore = new ThreadSafeCookieStore();

    // tuning
    private boolean tcpNoDelay = defaultTcpNoDelay();
    private boolean soReuseAddress = defaultSoReuseAddress();
    private int soLinger = defaultSoLinger();
    private int soSndBuf = defaultSoSndBuf();
    private int soRcvBuf = defaultSoRcvBuf();

    // internals
    private String threadPoolName = defaultThreadPoolName();
    private int httpClientCodecMaxInitialLineLength = defaultHttpClientCodecMaxInitialLineLength();
    private int httpClientCodecMaxHeaderSize = defaultHttpClientCodecMaxHeaderSize();
    private int httpClientCodecMaxChunkSize = defaultHttpClientCodecMaxChunkSize();
    private int httpClientCodecInitialBufferSize = defaultHttpClientCodecInitialBufferSize();
    private int chunkedFileChunkSize = defaultChunkedFileChunkSize();
    private boolean useNativeTransport = defaultUseNativeTransport();
    private ByteBufAllocator allocator;
    private Map<ChannelOption<Object>, Object> channelOptions = new HashMap<>();
    private EventLoopGroup eventLoopGroup;
    private Timer nettyTimer;
    private ThreadFactory threadFactory;
    private Consumer<Channel> httpAdditionalChannelInitializer;
    private Consumer<Channel> wsAdditionalChannelInitializer;
    private ResponseBodyPartFactory responseBodyPartFactory = ResponseBodyPartFactory.EAGER;
    private int ioThreadsCount = defaultIoThreadsCount();

    public Builder() {
    }

    public Builder(AsyncHttpClientConfig config) {
      // http
      followRedirect = config.isFollowRedirect();
      maxRedirects = config.getMaxRedirects();
      strict302Handling = config.isStrict302Handling();
      compressionEnforced = config.isCompressionEnforced();
      userAgent = config.getUserAgent();
      realm = config.getRealm();
      maxRequestRetry = config.getMaxRequestRetry();
      disableUrlEncodingForBoundRequests = config.isDisableUrlEncodingForBoundRequests();
      useLaxCookieEncoder = config.isUseLaxCookieEncoder();
      disableZeroCopy = config.isDisableZeroCopy();
      keepEncodingHeader = config.isKeepEncodingHeader();
      proxyServerSelector = config.getProxyServerSelector();

      // websocket
      aggregateWebSocketFrameFragments = config.isAggregateWebSocketFrameFragments();
      enablewebSocketCompression = config.isEnableWebSocketCompression();
      webSocketMaxBufferSize = config.getWebSocketMaxBufferSize();
      webSocketMaxFrameSize = config.getWebSocketMaxFrameSize();

      // timeouts
      connectTimeout = config.getConnectTimeout();
      requestTimeout = config.getRequestTimeout();
      readTimeout = config.getReadTimeout();
      shutdownQuietPeriod = config.getShutdownQuietPeriod();
      shutdownTimeout = config.getShutdownTimeout();

      // keep-alive
      keepAlive = config.isKeepAlive();
      pooledConnectionIdleTimeout = config.getPooledConnectionIdleTimeout();
      connectionTtl = config.getConnectionTtl();
      maxConnections = config.getMaxConnections();
      maxConnectionsPerHost = config.getMaxConnectionsPerHost();
      channelPool = config.getChannelPool();
      connectionSemaphoreFactory = config.getConnectionSemaphoreFactory();
      keepAliveStrategy = config.getKeepAliveStrategy();

      // ssl
      useInsecureTrustManager = config.isUseInsecureTrustManager();
      handshakeTimeout = config.getHandshakeTimeout();
      enabledProtocols = config.getEnabledProtocols();
      enabledCipherSuites = config.getEnabledCipherSuites();
      filterInsecureCipherSuites = config.isFilterInsecureCipherSuites();
      sslSessionCacheSize = config.getSslSessionCacheSize();
      sslSessionTimeout = config.getSslSessionTimeout();
      sslContext = config.getSslContext();
      sslEngineFactory = config.getSslEngineFactory();

      // filters
      requestFilters.addAll(config.getRequestFilters());
      responseFilters.addAll(config.getResponseFilters());
      ioExceptionFilters.addAll(config.getIoExceptionFilters());

      // tuning
      tcpNoDelay = config.isTcpNoDelay();
      soReuseAddress = config.isSoReuseAddress();
      soLinger = config.getSoLinger();
      soSndBuf = config.getSoSndBuf();
      soRcvBuf = config.getSoRcvBuf();

      // internals
      threadPoolName = config.getThreadPoolName();
      httpClientCodecMaxInitialLineLength = config.getHttpClientCodecMaxInitialLineLength();
      httpClientCodecMaxHeaderSize = config.getHttpClientCodecMaxHeaderSize();
      httpClientCodecMaxChunkSize = config.getHttpClientCodecMaxChunkSize();
      chunkedFileChunkSize = config.getChunkedFileChunkSize();
      channelOptions.putAll(config.getChannelOptions());
      eventLoopGroup = config.getEventLoopGroup();
      useNativeTransport = config.isUseNativeTransport();
      allocator = config.getAllocator();
      nettyTimer = config.getNettyTimer();
      threadFactory = config.getThreadFactory();
      httpAdditionalChannelInitializer = config.getHttpAdditionalChannelInitializer();
      wsAdditionalChannelInitializer = config.getWsAdditionalChannelInitializer();
      responseBodyPartFactory = config.getResponseBodyPartFactory();
      ioThreadsCount = config.getIoThreadsCount();
    }

    // http
    public Builder setFollowRedirect(boolean followRedirect) {
      this.followRedirect = followRedirect;
      return this;
    }

    public Builder setMaxRedirects(int maxRedirects) {
      this.maxRedirects = maxRedirects;
      return this;
    }

    public Builder setStrict302Handling(final boolean strict302Handling) {
      this.strict302Handling = strict302Handling;
      return this;
    }

    public Builder setCompressionEnforced(boolean compressionEnforced) {
      this.compressionEnforced = compressionEnforced;
      return this;
    }

    public Builder setUserAgent(String userAgent) {
      this.userAgent = userAgent;
      return this;
    }

    public Builder setRealm(Realm realm) {
      this.realm = realm;
      return this;
    }

    public Builder setRealm(Realm.Builder realmBuilder) {
      this.realm = realmBuilder.build();
      return this;
    }

    public Builder setMaxRequestRetry(int maxRequestRetry) {
      this.maxRequestRetry = maxRequestRetry;
      return this;
    }

    public Builder setDisableUrlEncodingForBoundRequests(boolean disableUrlEncodingForBoundRequests) {
      this.disableUrlEncodingForBoundRequests = disableUrlEncodingForBoundRequests;
      return this;
    }

    public Builder setUseLaxCookieEncoder(boolean useLaxCookieEncoder) {
      this.useLaxCookieEncoder = useLaxCookieEncoder;
      return this;
    }

    public Builder setDisableZeroCopy(boolean disableZeroCopy) {
      this.disableZeroCopy = disableZeroCopy;
      return this;
    }

    public Builder setKeepEncodingHeader(boolean keepEncodingHeader) {
      this.keepEncodingHeader = keepEncodingHeader;
      return this;
    }

    public Builder setProxyServerSelector(ProxyServerSelector proxyServerSelector) {
      this.proxyServerSelector = proxyServerSelector;
      return this;
    }

    public Builder setValidateResponseHeaders(boolean validateResponseHeaders) {
      this.validateResponseHeaders = validateResponseHeaders;
      return this;
    }

    public Builder setProxyServer(ProxyServer proxyServer) {
      this.proxyServerSelector = uri -> proxyServer;
      return this;
    }

    public Builder setProxyServer(ProxyServer.Builder proxyServerBuilder) {
      return setProxyServer(proxyServerBuilder.build());
    }

    public Builder setUseProxySelector(boolean useProxySelector) {
      this.useProxySelector = useProxySelector;
      return this;
    }

    public Builder setUseProxyProperties(boolean useProxyProperties) {
      this.useProxyProperties = useProxyProperties;
      return this;
    }

    // websocket
    public Builder setAggregateWebSocketFrameFragments(boolean aggregateWebSocketFrameFragments) {
      this.aggregateWebSocketFrameFragments = aggregateWebSocketFrameFragments;
      return this;
    }

    public Builder setEnablewebSocketCompression(boolean enablewebSocketCompression) {
      this.enablewebSocketCompression = enablewebSocketCompression;
      return this;
    }

    public Builder setWebSocketMaxBufferSize(int webSocketMaxBufferSize) {
      this.webSocketMaxBufferSize = webSocketMaxBufferSize;
      return this;
    }

    public Builder setWebSocketMaxFrameSize(int webSocketMaxFrameSize) {
      this.webSocketMaxFrameSize = webSocketMaxFrameSize;
      return this;
    }

    // timeouts
    public Builder setConnectTimeout(int connectTimeout) {
      this.connectTimeout = connectTimeout;
      return this;
    }

    public Builder setRequestTimeout(int requestTimeout) {
      this.requestTimeout = requestTimeout;
      return this;
    }

    public Builder setReadTimeout(int readTimeout) {
      this.readTimeout = readTimeout;
      return this;
    }

    public Builder setShutdownQuietPeriod(int shutdownQuietPeriod) {
      this.shutdownQuietPeriod = shutdownQuietPeriod;
      return this;
    }

    public Builder setShutdownTimeout(int shutdownTimeout) {
      this.shutdownTimeout = shutdownTimeout;
      return this;
    }

    // keep-alive
    public Builder setKeepAlive(boolean keepAlive) {
      this.keepAlive = keepAlive;
      return this;
    }

    public Builder setPooledConnectionIdleTimeout(int pooledConnectionIdleTimeout) {
      this.pooledConnectionIdleTimeout = pooledConnectionIdleTimeout;
      return this;
    }

    public Builder setConnectionPoolCleanerPeriod(int connectionPoolCleanerPeriod) {
      this.connectionPoolCleanerPeriod = connectionPoolCleanerPeriod;
      return this;
    }

    public Builder setConnectionTtl(int connectionTtl) {
      this.connectionTtl = connectionTtl;
      return this;
    }

    public Builder setMaxConnections(int maxConnections) {
      this.maxConnections = maxConnections;
      return this;
    }

    public Builder setMaxConnectionsPerHost(int maxConnectionsPerHost) {
      this.maxConnectionsPerHost = maxConnectionsPerHost;
      return this;
    }

    public Builder setChannelPool(ChannelPool channelPool) {
      this.channelPool = channelPool;
      return this;
    }

    public Builder setConnectionSemaphoreFactory(ConnectionSemaphoreFactory connectionSemaphoreFactory) {
      this.connectionSemaphoreFactory = connectionSemaphoreFactory;
      return this;
    }

    public Builder setKeepAliveStrategy(KeepAliveStrategy keepAliveStrategy) {
      this.keepAliveStrategy = keepAliveStrategy;
      return this;
    }

    // ssl
    public Builder setUseOpenSsl(boolean useOpenSsl) {
      this.useOpenSsl = useOpenSsl;
      return this;
    }

    public Builder setUseInsecureTrustManager(boolean useInsecureTrustManager) {
      this.useInsecureTrustManager = useInsecureTrustManager;
      return this;
    }

    public Builder setDisableHttpsEndpointIdentificationAlgorithm(boolean disableHttpsEndpointIdentificationAlgorithm) {
      this.disableHttpsEndpointIdentificationAlgorithm = disableHttpsEndpointIdentificationAlgorithm;
      return this;
    }

    public Builder setHandshakeTimeout(int handshakeTimeout) {
      this.handshakeTimeout = handshakeTimeout;
      return this;
    }

    public Builder setEnabledProtocols(String[] enabledProtocols) {
      this.enabledProtocols = enabledProtocols;
      return this;
    }

    public Builder setEnabledCipherSuites(String[] enabledCipherSuites) {
      this.enabledCipherSuites = enabledCipherSuites;
      return this;
    }

    public Builder setFilterInsecureCipherSuites(boolean filterInsecureCipherSuites) {
      this.filterInsecureCipherSuites = filterInsecureCipherSuites;
      return this;
    }

    public Builder setSslSessionCacheSize(Integer sslSessionCacheSize) {
      this.sslSessionCacheSize = sslSessionCacheSize;
      return this;
    }

    public Builder setSslSessionTimeout(Integer sslSessionTimeout) {
      this.sslSessionTimeout = sslSessionTimeout;
      return this;
    }

    public Builder setSslContext(final SslContext sslContext) {
      this.sslContext = sslContext;
      return this;
    }

    public Builder setSslEngineFactory(SslEngineFactory sslEngineFactory) {
      this.sslEngineFactory = sslEngineFactory;
      return this;
    }

    // filters
    public Builder addRequestFilter(RequestFilter requestFilter) {
      requestFilters.add(requestFilter);
      return this;
    }

    public Builder removeRequestFilter(RequestFilter requestFilter) {
      requestFilters.remove(requestFilter);
      return this;
    }

    public Builder addResponseFilter(ResponseFilter responseFilter) {
      responseFilters.add(responseFilter);
      return this;
    }

    public Builder removeResponseFilter(ResponseFilter responseFilter) {
      responseFilters.remove(responseFilter);
      return this;
    }

    public Builder addIOExceptionFilter(IOExceptionFilter ioExceptionFilter) {
      ioExceptionFilters.add(ioExceptionFilter);
      return this;
    }

    public Builder removeIOExceptionFilter(IOExceptionFilter ioExceptionFilter) {
      ioExceptionFilters.remove(ioExceptionFilter);
      return this;
    }

    // cookie store
    public Builder setCookieStore(CookieStore cookieStore) {
      this.cookieStore = cookieStore;
      return this;
    }

    // tuning
    public Builder setTcpNoDelay(boolean tcpNoDelay) {
      this.tcpNoDelay = tcpNoDelay;
      return this;
    }

    public Builder setSoReuseAddress(boolean soReuseAddress) {
      this.soReuseAddress = soReuseAddress;
      return this;
    }

    public Builder setSoLinger(int soLinger) {
      this.soLinger = soLinger;
      return this;
    }

    public Builder setSoSndBuf(int soSndBuf) {
      this.soSndBuf = soSndBuf;
      return this;
    }

    public Builder setSoRcvBuf(int soRcvBuf) {
      this.soRcvBuf = soRcvBuf;
      return this;
    }

    // internals
    public Builder setThreadPoolName(String threadPoolName) {
      this.threadPoolName = threadPoolName;
      return this;
    }

    public Builder setHttpClientCodecMaxInitialLineLength(int httpClientCodecMaxInitialLineLength) {
      this.httpClientCodecMaxInitialLineLength = httpClientCodecMaxInitialLineLength;
      return this;
    }

    public Builder setHttpClientCodecMaxHeaderSize(int httpClientCodecMaxHeaderSize) {
      this.httpClientCodecMaxHeaderSize = httpClientCodecMaxHeaderSize;
      return this;
    }

    public Builder setHttpClientCodecMaxChunkSize(int httpClientCodecMaxChunkSize) {
      this.httpClientCodecMaxChunkSize = httpClientCodecMaxChunkSize;
      return this;
    }

    public Builder setHttpClientCodecInitialBufferSize(int httpClientCodecInitialBufferSize) {
      this.httpClientCodecInitialBufferSize = httpClientCodecInitialBufferSize;
      return this;
    }

    public Builder setChunkedFileChunkSize(int chunkedFileChunkSize) {
      this.chunkedFileChunkSize = chunkedFileChunkSize;
      return this;
    }

    @SuppressWarnings("unchecked")
    public <T> Builder addChannelOption(ChannelOption<T> name, T value) {
      channelOptions.put((ChannelOption<Object>) name, value);
      return this;
    }

    public Builder setEventLoopGroup(EventLoopGroup eventLoopGroup) {
      this.eventLoopGroup = eventLoopGroup;
      return this;
    }

    public Builder setUseNativeTransport(boolean useNativeTransport) {
      this.useNativeTransport = useNativeTransport;
      return this;
    }

    public Builder setAllocator(ByteBufAllocator allocator) {
      this.allocator = allocator;
      return this;
    }

    public Builder setNettyTimer(Timer nettyTimer) {
      this.nettyTimer = nettyTimer;
      return this;
    }

    public Builder setThreadFactory(ThreadFactory threadFactory) {
      this.threadFactory = threadFactory;
      return this;
    }

    public Builder setHttpAdditionalChannelInitializer(Consumer<Channel> httpAdditionalChannelInitializer) {
      this.httpAdditionalChannelInitializer = httpAdditionalChannelInitializer;
      return this;
    }

    public Builder setWsAdditionalChannelInitializer(Consumer<Channel> wsAdditionalChannelInitializer) {
      this.wsAdditionalChannelInitializer = wsAdditionalChannelInitializer;
      return this;
    }

    public Builder setResponseBodyPartFactory(ResponseBodyPartFactory responseBodyPartFactory) {
      this.responseBodyPartFactory = responseBodyPartFactory;
      return this;
    }

    public Builder setIoThreadsCount(int ioThreadsCount) {
      this.ioThreadsCount = ioThreadsCount;
      return this;
    }

    private ProxyServerSelector resolveProxyServerSelector() {
      if (proxyServerSelector != null)
        return proxyServerSelector;

      if (useProxySelector)
        return ProxyUtils.getJdkDefaultProxyServerSelector();

      if (useProxyProperties)
        return ProxyUtils.createProxyServerSelector(System.getProperties());

      return ProxyServerSelector.NO_PROXY_SELECTOR;
    }

    public DefaultAsyncHttpClientConfig build() {

      return new DefaultAsyncHttpClientConfig(
              followRedirect,
              maxRedirects,
              strict302Handling,
              compressionEnforced,
              userAgent,
              realm,
              maxRequestRetry,
              disableUrlEncodingForBoundRequests,
              useLaxCookieEncoder,
              disableZeroCopy,
              keepEncodingHeader,
              resolveProxyServerSelector(),
              validateResponseHeaders,
              aggregateWebSocketFrameFragments,
              enablewebSocketCompression,
              connectTimeout,
              requestTimeout,
              readTimeout,
              shutdownQuietPeriod,
              shutdownTimeout,
              keepAlive,
              pooledConnectionIdleTimeout,
              connectionPoolCleanerPeriod,
              connectionTtl,
              maxConnections,
              maxConnectionsPerHost,
              channelPool,
              connectionSemaphoreFactory,
              keepAliveStrategy,
              useOpenSsl,
              useInsecureTrustManager,
              disableHttpsEndpointIdentificationAlgorithm,
              handshakeTimeout,
              enabledProtocols,
              enabledCipherSuites,
              filterInsecureCipherSuites,
              sslSessionCacheSize,
              sslSessionTimeout,
              sslContext,
              sslEngineFactory,
              requestFilters.isEmpty() ? Collections.emptyList() : Collections.unmodifiableList(requestFilters),
              responseFilters.isEmpty() ? Collections.emptyList() : Collections.unmodifiableList(responseFilters),
              ioExceptionFilters.isEmpty() ? Collections.emptyList() : Collections.unmodifiableList(ioExceptionFilters),
              cookieStore,
              tcpNoDelay,
              soReuseAddress,
              soLinger,
              soSndBuf,
              soRcvBuf,
              threadPoolName,
              httpClientCodecMaxInitialLineLength,
              httpClientCodecMaxHeaderSize,
              httpClientCodecMaxChunkSize,
              httpClientCodecInitialBufferSize,
              chunkedFileChunkSize,
              webSocketMaxBufferSize,
              webSocketMaxFrameSize,
              channelOptions.isEmpty() ? Collections.emptyMap() : Collections.unmodifiableMap(channelOptions),
              eventLoopGroup,
              useNativeTransport,
              allocator,
              nettyTimer,
              threadFactory,
              httpAdditionalChannelInitializer,
              wsAdditionalChannelInitializer,
              responseBodyPartFactory,
              ioThreadsCount);
    }
  }
}
