{ config, pkgs, lib, flakeRoot, ... }:

let
  emacsExtraPackages = epkgs: [
    epkgs.manualPackages.treesit-grammars.with-all-grammars
    epkgs.nerd-icons
    epkgs.doom-modeline
    epkgs.diminish
    epkgs.eldoc
    epkgs.pulsar
    epkgs.which-key
    epkgs.expreg
    epkgs.vundo
    epkgs.puni
    epkgs.avy
    epkgs.consult
    epkgs.vertico
    epkgs.marginalia
    epkgs.crux
    epkgs.magit
    epkgs.nerd-icons-corfu
    epkgs.corfu
    epkgs.cape
    epkgs.orderless
    epkgs.yasnippet
    epkgs.yasnippet-snippets
    epkgs.rg
    epkgs.exec-path-from-shell
    epkgs.eat
    epkgs.rust-mode
    epkgs.rustic
    epkgs.nix-mode
    epkgs.hcl-mode
    epkgs.shell-pop
    epkgs.envrc
    epkgs.nixpkgs-fmt
    epkgs.f
    epkgs.gptel
    epkgs.catppuccin-theme
    epkgs.eldoc-box
    epkgs.sideline
    epkgs.sideline-flymake
    epkgs.sideline-eglot
  ];
in
{
  #################################
  # System-level Emacs
  #################################
  programs.emacs = {
    enable = true;
    package = pkgs.emacs-pgtk.override { withTreeSitter = true; };
    extraPackages = emacsExtraPackages;
  };

  #################################
  # Home Manager-level configuration
  # Only define if Home Manager is active
  #################################
  home-manager.useGlobalPkgs = lib.optionalBool (config.home-manager != null) true;
  home-manager.useUserPackages = lib.optionalBool (config.home-manager != null) true;

  home.sessionVariables = lib.optionalAttrs (config.home-manager != null) {
    EDITOR = "emacs";
    XDG_SCREENSHOTS_DIR = "~/screenshots";
  };

  home.file = lib.optionalAttrs (config.home-manager != null) {
    ".emacs.d/early-init.el" = {
      source = "${flakeRoot}/assets/traveldroid/conf/emacs/early-init.el";
    };
    ".emacs.d/init.el" = {
      source = "${flakeRoot}/assets/traveldroid/conf/emacs/init.el";
    };
  };
}