/*
    * Copyright 2020-2022 The OSHI Project Contributors
    * SPDX-License-Identifier: MIT
    */
   package oshi.software.os.unix.aix;
   
   import static com.sun.jna.platform.unix.LibCAPI.HOST_NAME_MAX;
   
   import com.sun.jna.Native;
  
  import oshi.annotation.concurrent.ThreadSafe;
  import oshi.jna.platform.unix.AixLibc;
  import oshi.software.common.AbstractNetworkParams;
  import oshi.util.Constants;
  import oshi.util.ExecutingCommand;
  import oshi.util.ParseUtil;
  
  /**
   * AixNetworkParams class.
   */
  @ThreadSafe
  final class AixNetworkParams extends AbstractNetworkParams {
  
      private static final AixLibc LIBC = AixLibc.INSTANCE;
  
      @Override
      public String getHostName() {
          byte[] hostnameBuffer = new byte[HOST_NAME_MAX + 1];
          if (0 != LIBC.gethostname(hostnameBuffer, hostnameBuffer.length)) {
              return super.getHostName();
          }
          return Native.toString(hostnameBuffer);
      }
  
      @Override
      public String getIpv4DefaultGateway() {
          return getDefaultGateway("netstat -rnf inet");
      }
  
      @Override
      public String getIpv6DefaultGateway() {
          return getDefaultGateway("netstat -rnf inet6");
      }
  
      private static String getDefaultGateway(String netstat) {
          /*-
          $ netstat -rnf inet
          Routing tables
          Destination        Gateway           Flags   Refs     Use  If   Exp  Groups
          *
          Route Tree for Protocol Family 2 (Internet):
          default            192.168.10.1      UG        9    873816 en0      -      -
          127/8              127.0.0.1         U         9    839480 lo0      -      -
          192.168.10.0       192.168.10.80     UHSb      0         0 en0      -      -   =>
          192.168.10/24      192.168.10.80     U         3    394820 en0      -      -
          192.168.10.80      127.0.0.1         UGHS      0         7 lo0      -      -
          192.168.10.255     192.168.10.80     UHSb      2      7466 en0      -      -
          */
          for (String line : ExecutingCommand.runNative(netstat)) {
              String[] split = ParseUtil.whitespaces.split(line);
              if (split.length > 7 && "default".equals(split[0])) {
                  return split[1];
              }
          }
          return Constants.UNKNOWN;
      }
  }