/*
    * 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.v5;
  
  import io.netty.handler.codec.DecoderResult;
  import io.netty.util.NetUtil;
  import io.netty.util.internal.ObjectUtil;
  import io.netty.util.internal.StringUtil;
  
  import java.net.IDN;
  
  /**
   * The default {@link Socks5CommandRequest}.
   */
  public final class DefaultSocks5CommandRequest extends AbstractSocks5Message implements Socks5CommandRequest {
  
      private final Socks5CommandType type;
      private final Socks5AddressType dstAddrType;
      private final String dstAddr;
      private final int dstPort;
  
      public DefaultSocks5CommandRequest(
              Socks5CommandType type, Socks5AddressType dstAddrType, String dstAddr, int dstPort) {
  
          this.type = ObjectUtil.checkNotNull(type, "type");
          ObjectUtil.checkNotNull(dstAddrType, "dstAddrType");
          ObjectUtil.checkNotNull(dstAddr, "dstAddr");
  
          if (dstAddrType == Socks5AddressType.IPv4) {
              if (!NetUtil.isValidIpV4Address(dstAddr)) {
                  throw new IllegalArgumentException("dstAddr: " + dstAddr + " (expected: a valid IPv4 address)");
              }
          } else if (dstAddrType == Socks5AddressType.DOMAIN) {
              dstAddr = IDN.toASCII(dstAddr);
              if (dstAddr.length() > 255) {
                  throw new IllegalArgumentException("dstAddr: " + dstAddr + " (expected: less than 256 chars)");
              }
          } else if (dstAddrType == Socks5AddressType.IPv6) {
              if (!NetUtil.isValidIpV6Address(dstAddr)) {
                  throw new IllegalArgumentException("dstAddr: " + dstAddr + " (expected: a valid IPv6 address");
              }
          }
  
          if (dstPort < 0 || dstPort > 65535) {
              throw new IllegalArgumentException("dstPort: " + dstPort + " (expected: 0~65535)");
          }
  
          this.dstAddrType = dstAddrType;
          this.dstAddr = dstAddr;
          this.dstPort = dstPort;
      }
  
      @Override
      public Socks5CommandType type() {
          return type;
      }
  
      @Override
      public Socks5AddressType dstAddrType() {
          return dstAddrType;
      }
  
      @Override
      public String dstAddr() {
          return dstAddr;
      }
  
      @Override
      public int dstPort() {
          return dstPort;
      }
  
      @Override
      public String toString() {
          StringBuilder buf = new StringBuilder(128);
          buf.append(StringUtil.simpleClassName(this));
  
          DecoderResult decoderResult = decoderResult();
          if (!decoderResult.isSuccess()) {
              buf.append("(decoderResult: ");
              buf.append(decoderResult);
              buf.append(", type: ");
          } else {
              buf.append("(type: ");
          }
          buf.append(type());
         buf.append(", dstAddrType: ");
         buf.append(dstAddrType());
         buf.append(", dstAddr: ");
         buf.append(dstAddr());
         buf.append(", dstPort: ");
         buf.append(dstPort());
         buf.append(')');
 
         return buf.toString();
     }
 }