{ lib, pkgs, ... }:

{
  config = {
    nixpkgs.overlays = [
      (self: super: rec {
        emacs = pkgs.writeShellScriptBin "dummy-emacs-28.0.5" "" // {
          outPath = "@emacs@";
        };
        emacsPackagesFor = _:
          lib.makeScope super.newScope (_: { emacsWithPackages = _: emacs; });
      })
    ];

    programs.emacs.enable = true;
    services.emacs.enable = true;
    services.emacs.client.enable = true;
    services.emacs.extraOptions = [ "-f" "exwm-enable" ];
    services.emacs.socketActivation.enable = true;

    nmt.script = ''
      assertFileExists home-files/.config/systemd/user/emacs.socket
      assertFileExists home-files/.config/systemd/user/emacs.service
      assertFileExists home-path/share/applications/emacsclient.desktop

      assertFileContent \
        home-files/.config/systemd/user/emacs.socket \
        ${./emacs-socket-emacs.socket}

      assertFileContent \
        home-files/.config/systemd/user/emacs.service \
        ${
          pkgs.substituteAll {
            inherit (pkgs) runtimeShell coreutils;
            src = ./emacs-socket-emacs.service;
          }
        }

      assertFileContent \
        home-path/share/applications/emacsclient.desktop \
        ${./emacs-28-emacsclient.desktop}
    '';
  };
}