{ lib
, python3Packages
, gobject-introspection
, wrapGAppsHook4
, libadwaita
, gtk4
, gdk-pixbuf
}:

python3Packages.buildPythonApplication {
  pname   = "pixlit";
  version = "1.0.0";

  src = ./.;

  format = "other";   # plain script — no setup.py / pyproject.toml

  # No compile step needed for pure Python
  dontBuild = true;

  nativeBuildInputs = [
    gobject-introspection
    wrapGAppsHook4
  ];

  buildInputs = [
    gtk4
    libadwaita
    gdk-pixbuf
  ];

  propagatedBuildInputs = with python3Packages; [
    pillow
    pillow-heif   # registers HEIC/HEIF opener with Pillow
    pygobject3
  ];

  installPhase = ''
    runHook preInstall

    # ── Binary ───────────────────────────────────────────────────────────────
    install -Dm755 pixlit.py $out/bin/pixlit

    # ── Icons ────────────────────────────────────────────────────────────────
    install -Dm644 pixlit.svg \
      $out/share/icons/hicolor/scalable/apps/pixlit.svg

    for size in 128 256 512; do
      install -Dm644 pixlit-''${size}.png \
        $out/share/icons/hicolor/''${size}x''${size}/apps/pixlit.png
    done

    # ── Desktop entry ─────────────────────────────────────────────────────────
    install -Dm644 /dev/stdin $out/share/applications/pixlit.desktop <<EOF
    [Desktop Entry]
    Name=Pixlit
    Comment=Convert images between HEIC, JPEG, PNG, and WebP
    Exec=pixlit
    Icon=pixlit
    Terminal=false
    Type=Application
    Categories=Graphics;Photography;
    MimeType=image/heic;image/heif;image/jpeg;image/png;image/webp;
    StartupNotify=true
    EOF

    runHook postInstall
  '';

  meta = with lib; {
    description = "Image converter supporting HEIC, JPEG, PNG, and WebP";
    license     = licenses.mit;
    platforms   = platforms.linux;
    mainProgram = "pixlit";
    maintainers = [];
  };
}