/*
    * Copyright 2012 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.netty.handler.codec.socksx.v4;
  
  import io.netty.handler.codec.DecoderResult;
  import io.netty.util.NetUtil;
  import io.netty.util.internal.ObjectUtil;
  import io.netty.util.internal.StringUtil;
  
  /**
   * The default {@link Socks4CommandResponse}.
   */
  public class DefaultSocks4CommandResponse extends AbstractSocks4Message implements Socks4CommandResponse {
  
      private final Socks4CommandStatus status;
      private final String dstAddr;
      private final int dstPort;
  
      /**
       * Creates a new instance.
       *
       * @param status the status of the response
       */
      public DefaultSocks4CommandResponse(Socks4CommandStatus status) {
          this(status, null, 0);
      }
  
      /**
       * Creates a new instance.
       *
       * @param status the status of the response
       * @param dstAddr the {@code DSTIP} field of the response
       * @param dstPort the {@code DSTPORT} field of the response
       */
      public DefaultSocks4CommandResponse(Socks4CommandStatus status, String dstAddr, int dstPort) {
          if (dstAddr != null) {
              if (!NetUtil.isValidIpV4Address(dstAddr)) {
                  throw new IllegalArgumentException(
                          "dstAddr: " + dstAddr + " (expected: a valid IPv4 address)");
              }
          }
          if (dstPort < 0 || dstPort > 65535) {
              throw new IllegalArgumentException("dstPort: " + dstPort + " (expected: 0~65535)");
          }
  
          this.status = ObjectUtil.checkNotNull(status, "cmdStatus");
          this.dstAddr = dstAddr;
          this.dstPort = dstPort;
      }
  
      @Override
      public Socks4CommandStatus status() {
          return status;
      }
  
      @Override
      public String dstAddr() {
          return dstAddr;
      }
  
      @Override
      public int dstPort() {
          return dstPort;
      }
  
      @Override
      public String toString() {
          StringBuilder buf = new StringBuilder(96);
          buf.append(StringUtil.simpleClassName(this));
  
          DecoderResult decoderResult = decoderResult();
          if (!decoderResult.isSuccess()) {
              buf.append("(decoderResult: ");
              buf.append(decoderResult);
              buf.append(", dstAddr: ");
          } else {
              buf.append("(dstAddr: ");
          }
          buf.append(dstAddr());
          buf.append(", dstPort: ");
          buf.append(dstPort());
          buf.append(')');
  
          return buf.toString();
      }
  }