/*
    * Copyright 2016 The Netty Project
    *
    * The Netty Project 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:
    *
    *   https://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 io.netty5.bootstrap;
  
  import io.netty5.channel.Channel;
  import io.netty5.channel.ChannelFactory;
  import io.netty5.channel.ChannelHandler;
  import io.netty5.channel.ChannelOption;
  import io.netty5.channel.EventLoopGroup;
  import io.netty5.channel.ServerChannelFactory;
  import io.netty5.util.AttributeKey;
  import io.netty5.util.internal.StringUtil;
  
  import java.net.SocketAddress;
  import java.util.Map;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * Exposes the configuration of an {@link AbstractBootstrap}.
   */
  public abstract class AbstractBootstrapConfig<B extends AbstractBootstrap<B, C, F>, C extends Channel, F> {
  
      protected final B bootstrap;
  
      AbstractBootstrapConfig(B bootstrap) {
          this.bootstrap = requireNonNull(bootstrap, "bootstrap");
      }
  
      /**
       * Returns the configured local address or {@code null} if non is configured yet.
       */
      public final SocketAddress localAddress() {
          return bootstrap.localAddress();
      }
  
      /**
       * Returns the configured {@link ChannelFactory} / {@link ServerChannelFactory} or {@code null}
       * if non is configured yet.
       */
      @SuppressWarnings("deprecation")
      public abstract F channelFactory();
  
      /**
       * Returns the configured {@link ChannelHandler} or {@code null} if non is configured yet.
       */
      public final ChannelHandler handler() {
          return bootstrap.handler();
      }
  
      /**
       * Returns a copy of the configured options.
       */
      public final Map<ChannelOption<?>, Object> options() {
          return bootstrap.options();
      }
  
      /**
       * Returns a copy of the configured attributes.
       */
      public final Map<AttributeKey<?>, Object> attrs() {
          return bootstrap.attrs();
      }
  
      /**
       * Returns the configured {@link EventLoopGroup} or {@code null} if non is configured yet.
       */
      @SuppressWarnings("deprecation")
      public final EventLoopGroup group() {
          return bootstrap.group();
      }
  
      @Override
      public String toString() {
          StringBuilder buf = new StringBuilder()
                  .append(StringUtil.simpleClassName(this))
                  .append('(');
          EventLoopGroup group = group();
          if (group != null) {
              buf.append("group: ")
                      .append(StringUtil.simpleClassName(group))
                      .append(", ");
          }
          @SuppressWarnings("deprecation")
          F factory = channelFactory();
          if (factory != null) {
             buf.append("channelFactory: ")
                     .append(factory)
                     .append(", ");
         }
         SocketAddress localAddress = localAddress();
         if (localAddress != null) {
             buf.append("localAddress: ")
                     .append(localAddress)
                     .append(", ");
         }
 
         Map<ChannelOption<?>, Object> options = options();
         if (!options.isEmpty()) {
             buf.append("options: ")
                     .append(options)
                     .append(", ");
         }
         Map<AttributeKey<?>, Object> attrs = attrs();
         if (!attrs.isEmpty()) {
             buf.append("attrs: ")
                     .append(attrs)
                     .append(", ");
         }
         ChannelHandler handler = handler();
         if (handler != null) {
             buf.append("handler: ")
                     .append(handler)
                     .append(", ");
         }
         if (buf.charAt(buf.length() - 1) == '(') {
             buf.append(')');
         } else {
             buf.setCharAt(buf.length() - 2, ')');
             buf.setLength(buf.length() - 1);
         }
         return buf.toString();
     }
 }