{
  lib,
  helpers,
  config,
  pkgs,
  ...
}:
with lib; let
  cfg = config.plugins.telescope.extensions.undo;
in {
  options.plugins.telescope.extensions.undo = {
    enable = mkEnableOption "undo";

    package = helpers.mkPackageOption "telescope extension undo" pkgs.vimPlugins.telescope-undo-nvim;

    useDelta = helpers.defaultNullOpts.mkBool true ''
      When set to true, [delta](https://github.com/dandavison/delta) is used for fancy diffs in the preview section.
      If set to false, `telescope-undo` will not use `delta` even when available and fall back to a plain diff with
      treesitter highlights.
    '';

    useCustomCommand = helpers.mkNullOrOption (with types; listOf str) ''
      should be in this format: [ "bash" "-c" "echo '$DIFF' | delta" ]
    '';

    sideBySide = helpers.defaultNullOpts.mkBool false ''
      If set to true tells `delta` to render diffs side-by-side. Thus, requires `delta` to be
      used. Be aware that `delta` always uses its own configuration, so it might be that you're getting
      the side-by-side view even if this is set to false.
    '';

    diffContextLines = helpers.defaultNullOpts.mkNullable (with types; either ints.unsigned str) "vim.o.scrolloff" ''
      Defaults to the scrolloff.
    '';

    entryFormat = helpers.defaultNullOpts.mkStr "state #$ID, $STAT, $TIME" ''
      The format to show on telescope for the different versions of the file.
    '';

    timeFormat = helpers.defaultNullOpts.mkStr "" ''
      Can be set to a [Lua date format string](https://www.lua.org/pil/22.1.html).
    '';

    mappings = {
      i =
        helpers.defaultNullOpts.mkNullable
        (
          with types;
            attrsOf str
        )
        ''
          {
               "<cr>" = "yank_additions";
               "<s-cr>" = "yank_deletions";
               "<c-cr>" = "restore";
          }
        ''
        "Keymaps in insert mode";
      n =
        helpers.defaultNullOpts.mkNullable
        (
          with types;
            attrsOf str
        )
        ''
           {
                 "y" = "yank_additions";
                 "Y" = "yank_deletions";
                 "u" = "restore";
          }
        ''
        "Keymaps in normal mode";
    };
  };

  config = let
    configuration = with cfg; {
      use_delta = useDelta;
      use_custom_command = useCustomCommand;
      side_by_side = sideBySide;
      diff_context_lines =
        if isString diffContextLines
        then helpers.mkRaw diffContextLines
        else diffContextLines;
      entry_format = entryFormat;
      time_format = timeFormat;
      mappings = with mappings; {
        i =
          helpers.ifNonNull' i
          (
            mapAttrs
            (key: action:
              helpers.mkRaw "require('telescope-undo.actions').${action}")
            i
          );

        n =
          helpers.ifNonNull' n
          (
            mapAttrs
            (key: action:
              helpers.mkRaw "require('telescope-undo.actions').${action}")
            n
          );
      };
    };
  in
    mkIf
    cfg.enable
    {
      extraPlugins = [cfg.package];

      plugins.telescope.enabledExtensions = ["undo"];
      plugins.telescope.extensionConfig."undo" = configuration;
    };
}