{ writeShellScriptBin, envsubst }:

writeShellScriptBin "netali-default-config-ruby" ''
  if [[ $# -ne 6 ]]; then
    echo "Usage: netali-default-config-ruby [out-path] [hostname] [interface] [last-ip-block] [mode] [state-version]"
    echo ""
    echo "out-path:        path to which the configuration will be written"
    echo "hostname:        hostname of the new host"
    echo "interface:       name of the network interface to configure"
    echo "last-ip-block:   last block of the IPv6 address of this host"
    echo "mode:            'public' or 'internal' (affects IP subnet)"
    echo "state-version:   NixOS State Version"
    exit 1
  fi
  
  OUT_PATH=$1
  export TARGET_HOSTNAME="$2"
  export INTERFACE=$3
  export LAST_IP_BLOCK=$4
  MODE=$5
  export STATE_VERSION=$6

  if [[ $MODE == "public" ]]; then
    export PREFIX="2a00:fe0:1:21f::"
    export GATEWAY="2a00:fe0:1:21f::1"
  else
    export PREFIX="2a00:fe0:3f5:1000::"
    export GATEWAY="2a00:fe0:3f5:1000::1"
  fi

  cp ${./static.nix} $OUT_PATH/static.nix
  chmod 644 $OUT_PATH/static.nix
  ${envsubst}/bin/envsubst -i ${./config-template.txt} -o $OUT_PATH/configuration.nix
''