{ pkgs, lib, config, ... }:
let
  inherit (lib) mkIf mkEnableOption mkOption types pipe;

  cfg = config.modules.nushell.nuScripts;
  scripts = "${pkgs.nu_scripts.outPath}/share/nu_scripts/";

  managedIncludeOption = let
    filterOption = description:
      mkOption {
        inherit description;
        type = with types; nullOr (listOf str);
        default = null;
      };
  in name: {
    enable = mkEnableOption ''
      management of ${name}. 

      If the include and exclude options are both unset all items will be included.
    '';

    include = filterOption
      "${name} to include. Matches infix name of directory/file in nu_scripts";
    exclude = filterOption
      "${name} to exclude. Matches infix name of directory/file in nu_scripts";
  };

  pathCompletions = scripts + "custom-completions/";
  pathCompletionsAuto = pathCompletions + "auto-generate/completions/";
  pathModules = scripts + "modules/";
  pathAliases = scripts + "aliases/";
in {
  meta.maintainers = [ lib.maintainers."1adept" ];

  options.modules.nushell.nuScripts = {
    enable = mkEnableOption "script management for nu_script scripts";

    completions = managedIncludeOption "completions";
    completionsAutoGenerated =
      managedIncludeOption "auto generated completions";
    modules = managedIncludeOption "modules";
    aliases = managedIncludeOption "aliases";
  };

  config = mkIf (cfg.enable && config.modules.nushell.enable) {
    # Add nu_scripts
    home.packages = [ pkgs.nu_scripts ];

    programs.nushell.extraConfig = let
      getFiles = path:
        { enable, include ? [ ], exclude ? [ ], ... }:
        let
          isNuFile = lib.hasSuffix ".nu";

          # Collect all nu-files in ${path}
          nuFiles = pipe path [
            (builtins.readDir)
            (lib.mapAttrsToList (name: value:
              if isNuFile name then
                [ name ]
              else
                lib.optional (value == "directory") (pipe (path + "/" + name) [
                  (builtins.readDir)
                  (lib.mapAttrs (name2: value2: "${name}/${name2}"))
                  (lib.attrValues)
                ])))
            (lib.flatten)
            (lib.filter isNuFile)
          ];

          inList = list: item: lib.any (lib.flip lib.hasInfix item) list;

          selectedFiles = lib.filter (item:
            (include == null || inList include item)
            && (exclude == null || !inList exclude item)) nuFiles;

          result = map (name: path + name) selectedFiles;
        in lib.optionals enable result;

      useFiles = files:
        pipe files [
          (map (file: "use ${file} *"))
          (builtins.concatStringsSep "\n")
        ];

      completions = useFiles (getFiles pathCompletions cfg.completions);
      completionsAuto =
        useFiles (getFiles pathCompletionsAuto cfg.completionsAutoGenerated);
      aliases = useFiles (getFiles pathAliases cfg.aliases);
      modules = useFiles (getFiles pathModules cfg.modules);

      # Mk after main config file. This may be necessary for some scripts to be evaluated
    in lib.mkAfter ''
      # Generated with home-manager from github:nushell/nu_scripts
      # Completions --------------------------------------------
      ${completions}
      ${completionsAuto}
      # Modules ------------------------------------------------
      ${modules}
      # Aliases ------------------------------------------------
      ${aliases}
      # --------------------------------------------------------
      # Generated END
    '';
  };
}