{ lib, ... }:

let
  enableEmacs = true;  # Toggle to enable/disable Emacs module
in
{
  # Top-level option to enable Emacs
  options.enableEmacs = lib.mkEnableOption "Enable Emacs configuration";

  # Module configuration wrapped safely with mkIf
  config = lib.mkIf enableEmacs {
    myApps = {
      emacs = {
        enable = true;

        # Home Manager user (top-level default can be used)
        user = config.defaultUser or "henrov";

        # Emacs package specification and extra packages
        package = {
          name = "emacs-pgtk";
          withTreeSitter = true;
        };

        extraPackages = [
          # Tree-sitter and language support
          "manualPackages.treesit-grammars.with-all-grammars"
          "rust-mode"
          "rustic"
          "nix-mode"
          "hcl-mode"

          # UI/UX and navigation
          "nerd-icons"
          "doom-modeline"
          "diminish"
          "eldoc"
          "eldoc-box"
          "pulsar"
          "which-key"
          "avy"
          "consult"
          "vertico"
          "marginalia"
          "crux"
          "shell-pop"

          # Completion and snippets
          "nerd-icons-corfu"
          "corfu"
          "cape"
          "orderless"
          "yasnippet"
          "yasnippet-snippets"

          # Utilities and tools
          "rg"
          "exec-path-from-shell"
          "eat"
          "f"
          "gptel"
          "nixpkgs-fmt"
          "envrc"

          # Theming
          "catppuccin-theme"

          # Git
          "magit"

          # Editing and workflow
          "expreg"
          "vundo"
          "puni"

          # Error and side panel support
          "sideline"
          "sideline-flymake"
          "sideline-eglot"
        ];

        # Optional environment/session variables
        sessionVariables = {
          EDITOR = "emacs";
          XDG_SCREENSHOTS_DIR = "~/screenshots";
        };
      };
    };
  };
}