{ lib
, stdenv
, fetchurl
, dwarfs
, makeDesktopItem
, copyDesktopItems
, makeWrapper
, steam-run
, patchelf
, glibc
, zlib
}:

stdenv.mkDerivation (finalAttrs: {
  pname = "opengoal-launcher";
  version = "2.9.1";

  src = fetchurl {
    url = "https://github.com/open-goal/launcher/releases/download/v${finalAttrs.version}/OpenGOAL-Launcher_${finalAttrs.version}_amd64.AppImage";
    hash = "sha256-McdifSYCHmCTkbmAlSBYlsJwjNTSdinMnMoETi6g4C8=";
  };

  nativeBuildInputs = [
    dwarfs
    copyDesktopItems
    makeWrapper
  ];

  dontPatchELF = true;
  dontStrip = true;
  dontPatchShebangs = true;
  dontAutoPatchelf = true;
  dontUnpack = true;
  dontBuild = true;

  desktopItems = [
    (makeDesktopItem {
      name = "opengoal-launcher";
      exec = "opengoal-launcher";
      icon = "opengoal-launcher";
      desktopName = "OpenGOAL Launcher";
      comment = "Launcher for OpenGOAL - native PC port of Jak and Daxter";
      categories = [ "Game" ];
    })
  ];

  installPhase = ''
    runHook preInstall

    # Extract the DwarFS AppImage
    mkdir -p extracted
    dwarfsextract \
      -i ${finalAttrs.src} \
      -o extracted \
      --image-offset 1454544

    # Remove dangling symlinks from bundled AppImage
    find extracted -xtype l -delete

    # Install the self-contained binary and its bundled libs
    mkdir -p $out/opt/opengoal-launcher
    cp -r extracted/. $out/opt/opengoal-launcher/

    chmod +x $out/opt/opengoal-launcher/bin/OpenGOAL-Launcher
    chmod +x $out/opt/opengoal-launcher/sharun
    chmod +x $out/opt/opengoal-launcher/AppRun

    mkdir -p $out/bin

    # opengoal-patch-bins: run after the launcher downloads a new version
    # Uses a quoted heredoc ('EOF') so that $@ and other shell vars are
    # written literally into the generated script rather than expanded now
    cat > $out/bin/opengoal-patch-bins << 'PATCHSCRIPT'
    #!/bin/sh
    set -e

    VERSIONS_DIR="$1"

    if [ -z "$VERSIONS_DIR" ]; then
      echo "Usage: opengoal-patch-bins <path-to-version-dir>"
      echo "Example: opengoal-patch-bins /path/to/opengoal/versions/official/v0.3.1"
      exit 1
    fi

    LINKER="GLIBC_LIB/ld-linux-x86-64.so.2"
    RPATH="GLIBC_LIB:ZLIB_LIB"
    STEAM_RUN="STEAM_RUN_BIN"
    PATCHELF="PATCHELF_BIN"

    for bin in gk extractor goalc; do
      if [ -f "$VERSIONS_DIR/$bin" ]; then
        # Skip if already patched
        if [ -f "$VERSIONS_DIR/$bin.real" ]; then
          echo "Skipping $bin (already patched)"
          continue
        fi
        echo "Patching $bin..."
        "$PATCHELF" \
          --set-interpreter "$LINKER" \
          --set-rpath "$RPATH" \
          "$VERSIONS_DIR/$bin"
        mv "$VERSIONS_DIR/$bin" "$VERSIONS_DIR/$bin.real"
        printf '#!/bin/sh\nexec "%s" "%s" "$@"\n' \
          "$STEAM_RUN" \
          "$VERSIONS_DIR/$bin.real" \
          > "$VERSIONS_DIR/$bin"
        chmod +x "$VERSIONS_DIR/$bin"
        echo "Done: $bin"
      fi
    done

    echo "All binaries patched. You can now launch games via the OpenGOAL Launcher."
    PATCHSCRIPT

    # Replace the placeholders with actual nix store paths
    substituteInPlace $out/bin/opengoal-patch-bins \
      --replace "GLIBC_LIB" "${glibc}/lib" \
      --replace "ZLIB_LIB" "${zlib}/lib" \
      --replace "STEAM_RUN_BIN" "${steam-run}/bin/steam-run" \
      --replace "PATCHELF_BIN" "${patchelf}/bin/patchelf"

    chmod +x $out/bin/opengoal-patch-bins

    # Main launcher wrapper - clean PATH, no leaked build tools
    makeWrapper $out/opt/opengoal-launcher/AppRun $out/bin/opengoal-launcher \
      --set APPDIR $out/opt/opengoal-launcher \
      --prefix PATH : $out/opt/opengoal-launcher/bin

    # Install icon
    mkdir -p $out/share/icons/hicolor/256x256/apps
    cp extracted/OpenGOAL-Launcher.png \
      $out/share/icons/hicolor/256x256/apps/opengoal-launcher.png

    runHook postInstall
  '';

  meta = {
    description = "Launcher for OpenGOAL, a native PC port of the Jak and Daxter series";
    longDescription = ''
      OpenGOAL is a project to decompile and recompile the Jak and Daxter series
      of games for modern PC hardware. This launcher simplifies the installation,
      configuration, and update process for OpenGOAL games.

      Note: After the launcher downloads a new game version, run
      opengoal-patch-bins <path-to-version-dir> to patch the game binaries
      for NixOS compatibility. Example:
        opengoal-patch-bins /path/to/opengoal/versions/official/v0.3.1
    '';
    homepage = "https://opengoal.dev";
    downloadPage = "https://github.com/open-goal/launcher/releases";
    changelog = "https://github.com/open-goal/launcher/releases/tag/v${finalAttrs.version}";
    license = lib.licenses.isc;
    maintainers = with lib.maintainers; [ ];
    platforms = [ "x86_64-linux" ];
    sourceProvenance = with lib.sourceTypes; [ binaryNativeCode ];
  };
})