{ stdenv
, lib
, fetchFromGitHub
, lazarus
, fpc
, libX11

# GTK2/3
, pango
, cairo
, glib
, atk
, gtk2
, gtk3
, gdk-pixbuf
, python3

# Qt5
, libqt5pas
, qt5

, widgetset ? "qt5"
# See https://github.com/Alexey-T/CudaText-lexers
, additionalLexers ? [ "Nix" ]
}:

assert builtins.elem widgetset [ "gtk2" "gtk3" "qt5" ];

let
  deps = lib.mapAttrs
    (name: spec:
      fetchFromGitHub {
        repo = name;
        inherit (spec) owner rev hash;
      }
    )
    (lib.importJSON ./deps.json);
in
stdenv.mkDerivation rec {
  pname = "cudatext";
  version = "1.187.0";

  src = fetchFromGitHub {
    owner = "Alexey-T";
    repo = "CudaText";
    rev = version;
    hash = "sha256-Ri/VTJF59GCJdhbMWRAYaQifj7FjVYSACywpq8gHKXg=";
  };

  postPatch = ''
    substituteInPlace app/proc_globdata.pas \
      --replace "/usr/share/cudatext" "$out/share/cudatext" \
      --replace "libpython3.so" "${python3}/lib/libpython${python3.pythonVersion}.so" \
      --replace "AllowProgramUpdates:= true;" "AllowProgramUpdates:= false;"
  '';

  nativeBuildInputs = [ lazarus fpc ]
    ++ lib.optional (widgetset == "qt5") qt5.wrapQtAppsHook;

  buildInputs = [ libX11 ]
    ++ lib.optionals (lib.hasPrefix "gtk" widgetset) [ pango cairo glib atk gdk-pixbuf ]
    ++ lib.optional (widgetset == "gtk2") gtk2
    ++ lib.optional (widgetset == "gtk3") gtk3
    ++ lib.optional (widgetset == "qt5") libqt5pas;

  NIX_LDFLAGS = "--as-needed -rpath ${lib.makeLibraryPath buildInputs}";

  buildPhase = lib.concatStringsSep "\n" (lib.mapAttrsToList (name: dep: ''
    cp -r ${dep} ${name}
  '') deps) + ''
    # See https://wiki.freepascal.org/CudaText#How_to_compile_CudaText
    substituteInPlace ATSynEdit/atsynedit/atsynedit_package.lpk \
      --replace GTK2_IME_CODE _GTK2_IME_CODE

    lazbuild --lazarusdir=${lazarus}/share/lazarus --pcp=./lazarus --ws=${widgetset} \
      bgrabitmap/bgrabitmap/bgrabitmappack.lpk \
      EncConv/encconv/encconv_package.lpk \
      ATBinHex-Lazarus/atbinhex/atbinhex_package.lpk \
      ATFlatControls/atflatcontrols/atflatcontrols_package.lpk \
      ATSynEdit/atsynedit/atsynedit_package.lpk \
      ATSynEdit_Cmp/atsynedit_cmp/atsynedit_cmp_package.lpk \
      EControl/econtrol/econtrol_package.lpk \
      ATSynEdit_Ex/atsynedit_ex/atsynedit_ex_package.lpk \
      Python-for-Lazarus/python4lazarus/python4lazarus_package.lpk \
      Emmet-Pascal/emmet/emmet_package.lpk \
      app/cudatext.lpi
  '';

  installPhase = ''
    install -Dm755 app/cudatext -t $out/bin

    install -dm755 $out/share/cudatext
    cp -r app/{data,py,settings_default} $out/share/cudatext

    install -Dm644 setup/debfiles/cudatext-512.png -t $out/share/pixmaps
    install -Dm644 setup/debfiles/cudatext.desktop -t $out/share/applications
  '' + lib.concatMapStringsSep "\n" (lexer: ''
    if [ -d "CudaText-lexers/${lexer}" ]; then
      install -Dm644 CudaText-lexers/${lexer}/*.{cuda-lexmap,lcf} $out/share/cudatext/data/lexlib
    else
      echo "${lexer} lexer not found"
      exit 1
    fi
  '') additionalLexers;

  passthru.updateScript = ./update.sh;

  meta = with lib; {
    description = "Cross-platform code editor";
    longDescription = ''
      Text/code editor with lite UI. Syntax highlighting for 200+ languages.
      Config system in JSON files. Multi-carets and multi-selections.
      Search and replace with RegEx. Extendable by Python plugins and themes.
    '';
    homepage = "https://cudatext.github.io/";
    changelog = "https://cudatext.github.io/history.txt";
    license = licenses.mpl20;
    maintainers = with maintainers; [ sikmir ];
    platforms = platforms.linux;
  };
}