#! ruby -Ks

def main(params)
  if params[0].nil?
    help
  elsif params[0] == "DHCP"
    message("dhcp", "dhcp", "dhcp")
    command("address", "dhcp")
    command("dns", "dhcp")
  else
    if params[1].nil?
      message(params[0], "none", "none")
      command("address", "static #{params[0]} 255.255.255.0 none")
      command("dns", "static none")
    else
      if params[2].nil?
        message(params[0], params[1], params[1])
        command("address", "static #{params[0]} 255.255.255.0 #{params[1]} none")
        command("dns", "static #{params[1]} primary")
      else
        message(params[0], params[1], params[2])
        command("address", "static #{params[0]} 255.255.255.0 #{params[1]} none")
        command("dns", "static #{params[2]} primary")
      end
    end
  end
end

def command(mode, source)
  system("netsh interface ip set #{mode} \"ローカル エリア接続\" #{source}")
end

def message(address, gateway, dns)
  print "IP Address      : #{address}\n"
  print "Default Gateway : #{gateway}\n"
  print "DNS Server      : #{dns}\n"
end

def help
  print <<EOF
ipset address [gateway] [dns]

Ex.
  1) ipset dhcp
       {IP => dhcp, Gateway => dhcp, DNS => dhcp}

  2) ipset 192.168.0.100
       {IP => 192.168.0.100, Gateway => none, DNS => none}

  3) ipset 192.168.0.100 192.168.0.1
       {IP => 192.168.0.100, Gateway => 192.168.0.1, DNS => 192.168.0.1}

  4) ipset 192.168.0.100 192.168.0.1 192.168.0.250
       {IP => 192.168.0.100, Gateway => 192.168.0.1, DNS => 192.168.0.250}
EOF
end

ARGV.map!{|x| x.upcase }
main(ARGV)