{
  stdenv,
  librsvg,
  # Absolute path to the hyperhive.svg source so this derivation's input
  # hash is narrow: a change to any other source file does NOT bust it.
  hyperhiveSvg,
}:

# XDG icon set + .desktop entries for hyperhive processes so desktop
# environments can match running processes to icons (task managers, CPU
# monitors, etc.).
#
# Output layout:
#   $out/share/icons/hicolor/<N>x<N>/apps/hyperhive.png  (N = 16,32,48,64,128,256)
#   $out/share/pixmaps/hyperhive.png                     (48px fallback)
#   $out/share/applications/hive-c0re.desktop
#   $out/share/applications/hive-agent.desktop
stdenv.mkDerivation {
  pname = "hive-xdg-icons";
  version = "0.1.0";

  # No source tree — everything is built from the single SVG path.
  dontUnpack = true;

  nativeBuildInputs = [ librsvg ];

  buildPhase = ''
    runHook preBuild
    mkdir -p icons
    for size in 16 32 48 64 128 256; do
      rsvg-convert --width "$size" --height "$size" \
        -o "icons/hyperhive-''${size}.png" \
        ${hyperhiveSvg}
    done
    runHook postBuild
  '';

  installPhase = ''
        runHook preInstall
        # Per-size hicolor tree
        for size in 16 32 48 64 128 256; do
          mkdir -p "$out/share/icons/hicolor/''${size}x''${size}/apps"
          cp "icons/hyperhive-''${size}.png" \
             "$out/share/icons/hicolor/''${size}x''${size}/apps/hyperhive.png"
        done
        # Flat pixmaps fallback (48px)
        mkdir -p "$out/share/pixmaps"
        cp icons/hyperhive-48.png "$out/share/pixmaps/hyperhive.png"

        # .desktop entries — NoDisplay so they don't show up in app launchers
        # but are still discovered by process-to-icon matchers (GNOME, etc.).
        mkdir -p "$out/share/applications"
        cat > "$out/share/applications/hive-c0re.desktop" <<EOF
    [Desktop Entry]
    Type=Application
    Name=hyperhive core
    GenericName=hive-c0re
    Comment=hyperhive host daemon — container lifecycle, broker, operator dashboard
    Exec=hive-c0re serve
    Icon=hyperhive
    Categories=System;
    NoDisplay=true
    StartupNotify=false
    EOF
        cat > "$out/share/applications/hive-agent.desktop" <<EOF
    [Desktop Entry]
    Type=Application
    Name=hyperhive agent
    GenericName=hive-agent
    Comment=hyperhive per-agent harness (claude turn loop + MCP server)
    Exec=hive serve
    Icon=hyperhive
    Categories=System;
    NoDisplay=true
    StartupNotify=false
    EOF
        runHook postInstall
  '';

  dontFixup = true;

  meta = {
    description = "XDG icon set and .desktop entries for hyperhive processes";
  };
}