{ lib, flake-parts-lib, ... }:
let
  inherit (lib)
    mkIf
    mkOption
    mkPackageOption
    mkEnableOption
    types
    ;
  inherit (flake-parts-lib) mkPerSystemOption;
in
{
  options.perSystem = mkPerSystemOption (
    { config, pkgs, ... }:
    {
      options = {
        texShell = {
          scheme = mkPackageOption pkgs "texliveSmall" { };
          extraPackages = mkOption {
            type = types.functionTo (types.listOf types.package);
            description = "Extra packages to add to the texlive scheme";
            default = _: [ ];
          };
          latexmk = {
            enable = mkEnableOption "latexmk";
            rc = mkOption {
              type = types.lines;
              description = "contents of the .latexmkrc file";
            };
            rcFile = mkOption {
              type = types.path;
              default = pkgs.writeText "latexmkrc" config.texShell.latexmk.rc;
              description = "the .latexmkrc file";
            };
            _wrapper = mkOption {
              type = types.functionTo types.package;
              readOnly = true;
              internal = true;
              default =
                tex:
                pkgs.symlinkJoin {
                  inherit (tex) name;
                  nativeBuildInputs = [ pkgs.makeWrapper ];
                  paths = [ tex ];
                  postBuild = ''
                    wrapProgram $out/bin/latexmk --add-flags "-r" --add-flags "${config.texShell.latexmk.rcFile}"
                  '';
                };
            };
          };
          build = {
            package = mkOption {
              type = types.package;
              readOnly = true;
              default =
                let
                  wrapper = if config.texShell.latexmk.enable then config.texShell.latexmk._wrapper else x: x;
                in
                wrapper (config.texShell.scheme.withPackages config.texShell.extraPackages);
            };
            devShell = mkOption {
              type = types.package;
              readOnly = true;
              default = pkgs.mkShellNoCC { buildInputs = [ config.texShell.build.package ]; };
            };
          };
        };
      };

      config = {
        texShell.extraPackages = mkIf config.texShell.latexmk.enable (ps: [ ps.latexmk ]);
      };
    }
  );
}