{pkgs, gpu, ...}: {

  nixpkgs = {
    overlays = [
      # https://github.com/nix-community/nixpkgs-wayland
      inputs.nixpkgs-wayland.overlay
    ];
  };

  services.xserver.videoDrivers = [ gpu ];
  
  # tuigreet
  services.greetd = {
    enable = true;
    settings = {
      default_session = {
        command = "${pkgs.greetd.tuigreet}/bin/tuigreet --time --cmd Hyprland -g 'Authorized Personnel Only'";
        user = "greeter";
      };
    };
  };

  services.tlp = {
    enable = true;
  };

  # Brightness and volume control
  # https://haikarainen.github.io/light/
  programs.light.enable = true;
  # PolKit for the fingerprint reader
  security.polkit.enable = true;
  # https://github.com/NixOS/nixpkgs/issues/143365
  security.pam.services.swaylock = {}; 
  
  # Enabling hyprlnd on NixOS
  programs.hyprland = {
    enable = true;
    enableNvidiaPatches = true;
    xwayland.enable = true;
  };

  environment.sessionVariables = {
    # If your cursor becomes invisible
    WLR_NO_HARDWARE_CURSORS = "0";
    # Hint electron apps to use wayland
    NIXOS_OZONE_WL = "1";
  };

  services.logind.extraConfig = ''
    IdleActionSec=900
    IdleAction=suspend-then-hibernate
  '';

  systemd.sleep.extraConfig = ''
    AllowSuspend = yes
    AllowHibernate = yes
    AllowSuspendThenhibernate = yes
    AllowHybridSleep = yes

    HibernateDelaySec = 600
  '';

  # XDG portal
  xdg.portal.enable = true;
  xdg.portal.extraPortals = [ pkgs.xdg-desktop-portal-gtk ];

  # system packages
  environment.systemPackages = with pkgs; [
    # waybar
    (waybar.overrideAttrs (oldAttrs: {
        mesonFlags = oldAttrs.mesonFlags ++ [ "-Dexperimental=true" ];
      })
    )
    libnotify            # Notification libraries
    mako                 # Notification daemon
    swww                 # Wallpaper daemon
    kitty                # Terminal emulator
    rofi-wayland         # App Launcher
    networkmanagerapplet # NetworkManager control applet
    grim                 # Screenshots
    scrot                # screenshots
    slurp                # Screenshots
    wl-clipboard         # Clipboard
    font-awesome         # Fonts
    gruvbox-gtk-theme    # Gruvbox Theme
    papirus-icon-theme   # Papirus Icons
    libinput-gestures    # Gesture Control
    playerctl            # Control sublime-music from waybar?
    pavucontrol          # Pulse Audio Volume CONTROL
    glib                 # Set GTK theme settings
    greetd.tuigreet      # Greeter
    swayidle             # Idle management daemon - Automatic lock screen
    swayosd              # used for on-screen notifications for things like adjusting backlight, volume, etc
    nwg-bar
    wlogout
    ranger               # TUI file manager
    xdg-utils            # Utilities for better X/Wayland integration
  ];

  # nixpkgs-wayland 
  environment.systemPackages = with input.nixpkgs-wayland.pkgs; [
    wayprompt
  ]

  # Enable sound with pipewire.
  sound.enable = true;
  security.rtkit.enable = true;
  services.pipewire = {
    enable = true;
    alsa.enable = true;
    alsa.support32Bit = true;
    pulse.enable = true;
    jack.enable = true;
  };
}