{ lib
, python3
, pkgconfig
, wrapGAppsHook
, gettext
, gtk3
, glib
, dbus
, gobject-introspection
, xmodmap
, pygobject3
, setuptools
, evdev
, pydantic
, pydbus
, psutil
, fetchFromGitHub
, buildPythonApplication
, procps
, gtksourceview4
  # Change the default log level to debug for easier debugging of package issues
, withDebugLogLevel ? false
  # Xmodmap is an optional dependency
  # If you use Xmodmap to set keyboard mappings (or your DE does)
  # it is required to correctly map keys
, withXmodmap ? true
  # Version and rev and hash are package arguments to allow overriding
  # while ensuring the values in prePatch and src match
  # https://discourse.nixos.org/t/avoid-rec-expresions-in-nixpkgs/8293/7
  # The names are prefixed with input_remapper to avoid potential
  # collisions with package names
, input_remapper_version ? "unstable-2022-02-09"
, input_remapper_src_rev ? "55227e0b5a28d21d7333c6c8ea1c691e56fd35c4"
, input_remapper_src_hash ? "sha256-kzGlEaYN/JfAgbI0aMLr5mwObYOL43X7QU/ihDEBQFg="
}:

let
  maybeXmodmap = lib.optional withXmodmap xmodmap;
in
buildPythonApplication {
  pname = "input-remapper";
  version = input_remapper_version;

  src = fetchFromGitHub {
    rev = input_remapper_src_rev;
    owner = "sezanzeb";
    repo = "input-remapper";
    hash = input_remapper_src_hash;
  };

  # Fixes error
  # Couldn’t recognize the image file format for file "*.svg"
  # at startup, see https://github.com/NixOS/nixpkgs/issues/56943
  strictDeps = false;

  prePatch = ''
    # set revision for --version output
    echo "COMMIT_HASH = '${input_remapper_src_rev}'" > inputremapper/commit_hash.py

    # fix FHS paths
    substituteInPlace inputremapper/configs/data.py \
      --replace "/usr/share/input-remapper"  "$out/usr/share/input-remapper"
  '' + (lib.optionalString (withDebugLogLevel) ''
    # if debugging
    substituteInPlace inputremapper/logger.py --replace "logger.setLevel(logging.INFO)"  "logger.setLevel(logging.DEBUG)"
  '');

  doCheck = true;
  checkInputs = [
    psutil
  ];
  pythonImportsCheck = [
    "evdev"
    "inputremapper"
  ];

  # Custom test script, can't use plain pytest / pytestCheckHook
  # We only run tests in the unit folder, integration tests require UI
  # To allow tests which access the system and session DBUS to run, we start a dbus session
  # and bind it to both the system and session buses
  installCheckPhase = ''
    echo "<busconfig>
      <type>session</type>
      <listen>unix:tmpdir=$TMPDIR</listen>
      <listen>unix:path=/build/system_bus_socket</listen>
      <standard_session_servicedirs/>
      <policy context=\"default\">
        <!-- Allow everything to be sent -->
        <allow send_destination=\"*\" eavesdrop=\"true\"/>
        <!-- Allow everything to be received -->
        <allow eavesdrop=\"true\"/>
        <!-- Allow anyone to own anything -->
        <allow own=\"*\"/>
      </policy>
    </busconfig>" > dbus.cfg
    PATH=${lib.makeBinPath ([ dbus procps ] ++ maybeXmodmap)}:$PATH \
      USER="$(id -u -n)" \
      DBUS_SYSTEM_BUS_ADDRESS=unix:path=/build/system_bus_socket \
      ${dbus}/bin/dbus-run-session --config-file dbus.cfg \
      python tests/test.py --start-dir unit
  '';

  # Nixpkgs 15.9.4.3. When using wrapGAppsHook with special derivers you can end up with double wrapped binaries.
  dontWrapGApps = true;
  preFixup = ''
    makeWrapperArgs+=(
      "''${gappsWrapperArgs[@]}"
      --prefix PATH : "${lib.makeBinPath maybeXmodmap}"
    )
  '';

  nativeBuildInputs = [
    wrapGAppsHook
    gettext # needed to build translations
    gtk3
    glib
    gobject-introspection
    pygobject3
  ] ++ maybeXmodmap;

  propagatedBuildInputs = [
    setuptools # needs pkg_resources
    pygobject3
    evdev
    pkgconfig
    pydantic
    pydbus
    gtksourceview4
  ];

  postInstall = ''
    sed -r "s#RUN\+\=\"/bin/input-remapper-control#RUN\+\=\"$out/bin/input-remapper-control#g" -i data/99-input-remapper.rules
    sed -r "s#ExecStart\=/usr/bin/input-remapper-service#ExecStart\=$out/bin/input-remapper-service#g" -i data/input-remapper.service

    chmod +x data/*.desktop

    install -D -t $out/share/applications/ data/*.desktop
    install -D -t $out/share/polkit-1/actions/ data/input-remapper.policy
    install -D data/99-input-remapper.rules $out/etc/udev/rules.d/99-input-remapper.rules
    install -D data/input-remapper.service $out/lib/systemd/system/input-remapper.service
    install -D data/input-remapper.policy $out/share/polkit-1/actions/input-remapper.policy
    install -D data/inputremapper.Control.conf $out/etc/dbus-1/system.d/inputremapper.Control.conf
    install -D -t $out/usr/share/input-remapper/ data/*

    # Only install input-remapper prefixed binaries, we don't care about deprecated key-mapper ones
    install -m755 -D -t $out/bin/ bin/input-remapper*
  '';

  meta = with lib; {
    description = "An easy to use tool to change the mapping of your input device buttons";
    homepage = "https://github.com/sezanzeb/input-remapper";
    license = licenses.gpl3Plus;
    platforms = platforms.linux;
    maintainers = with maintainers; [ LunNova ];
    mainProgram = "input-remapper-gtk";
  };
}