# incus-ip-collector.nix
{
  writeShellScriptBin,
}:

writeShellScriptBin "ip-gather" ''
  set -euo pipefail

  remote_host="''${1:-"administrator@olympus"}"
  output_file="''${2:-hosts.json}"

  generate_json() {
    echo "{"
    first=true
    for c in $(incus list --format csv -c n | awk '!/NAME/ {print $1}'); do
      ip=$(incus exec "$c" -- ip -6 addr show dev ygg0 2>/dev/null | awk '/inet6/ {print $2}' | cut -d/ -f1 | grep -v '^fe80' | head -n1)
      if [ -n "$ip" ]; then
        [ "$first" = false ] && echo ","
        echo -n "  \"$c\": \"$ip\""
        first=false
      fi
    done
    echo ""
    echo "}"
  }

  if [ -n "''${remote_host}" ]; then
    # Execute remotely and save to local file
    ssh "$remote_host" "$(declare -f generate_json); generate_json" > "$output_file"
  else
    # Execute locally and save to file
    generate_json > "$output_file"
  fi

  echo "hosts saved to: $output_file"
''