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

let
  cfg = config.desktop.greeter;
in
{
  options.desktop.greeter = {
    enable = lib.mkEnableOption "greetd + tuigreet greeter (starts Hyprland)";

    greeterConfSource = lib.mkOption {
      type = lib.types.path;
      default = ../../../files/conf/greeter/greeter.conf;
      description = "Path to greeter.conf in your repo; will be installed to /etc/xdg/greeter/greeter.conf";
    };

    vt = lib.mkOption {
      type = lib.types.int;
      default = 1;
      description = "Virtual terminal (VT) greetd runs on (typically 1).";
    };

    extraArgs = lib.mkOption {
      type = lib.types.listOf lib.types.str;
      default = [ "--time" "--remember" "--remember-session" "--asterisks" ];
      description = "Extra command-line arguments passed to tuigreet.";
    };

    useDbusRunSession = lib.mkOption {
      type = lib.types.bool;
      default = true;
      description = "Wrap Hyprland with dbus-run-session (often helps session env).";
    };

    installGreeterPackages = lib.mkOption {
      type = lib.types.bool;
      default = true;
      description = "Add tuigreet (and optional qtgreet) to systemPackages.";
    };

    enableTty1Fix = lib.mkOption {
      type = lib.types.bool;
      default = true;
      description = "Ensure greetd owns tty1 (avoids boot console overriding greetd).";
    };
  };

  config = lib.mkIf cfg.enable {
    # greetd + tuigreet configuration
    services.greetd = {
      enable = true;
      settings = {
        terminal.vt = cfg.vt;

        default_session = {
          # greetd service runs the greeter as this user
          user = "greetd";

          # Build: tuigreet ... --cmd <Hyprland>
          command =
            let
              hyprCmd =
                if cfg.useDbusRunSession
                then "${pkgs.dbus}/bin/dbus-run-session ${pkgs.hyprland}/bin/Hyprland"
                else "${pkgs.hyprland}/bin/Hyprland";

              tuigreetArgs = lib.concatStringsSep " " cfg.extraArgs;
            in
              "${pkgs.tuigreet}/bin/tuigreet ${tuigreetArgs} --cmd ${hyprCmd}";
        };
      };
    };

    # Install your custom greeter config into /etc/xdg/greeter/greeter.conf
    environment.etc."xdg/greeter/greeter.conf".source = cfg.greeterConfSource;

    # Supporting bits (Wayland sessions almost always want these)
    services.dbus.enable = lib.mkDefault true;
    security.polkit.enable = lib.mkDefault true;

    # Optional: keep greeter tools available system-wide
    environment.systemPackages = lib.mkIf cfg.installGreeterPackages (with pkgs; [
      tuigreet
      qtgreet
    ]);

    # Fix "Graphical System started" but no greeter: ensure tty1 isn’t stolen by console/getty
    boot.kernelParams = lib.mkIf cfg.enableTty1Fix [ "console=tty1" ];
    systemd.services."getty@tty1".enable = lib.mkIf cfg.enableTty1Fix false;
    systemd.services."autovt@tty1".enable = lib.mkIf cfg.enableTty1Fix false;
  };
}