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

let
  grubThemeDir = "/boot/grub/themes/catppuccin-mocha";
  grubThemeFile = "${grubThemeDir}/theme.txt";
  plymouthThemeDir = "/usr/share/plymouth/themes/catppuccin";
in
{
  boot = {
    initrd = {
      verbose = false;
      kernelModules = [];
    };

    kernelPackages = pkgs.linuxPackages_latest;
    kernelParams = [ "quiet" "udev.log_level=3" "systemd.show_status=auto" ];
    consoleLogLevel = 3;

    supportedFilesystems = [ "ntfs" ];

    # Correct GRUB + UEFI configuration
    loader = {
      grub = {
        enable = true;
        efiSupport = true;      # enable UEFI mode
        devices = [ "nodev" ];  # nodev for UEFI
        useOSProber = true;
        theme = grubThemeFile;
      };

      timeout = 5;
    };

    # Plymouth splashscreen
    plymouth = {
      enable = true;
      theme = "rings";
      themePackages = with pkgs; [
        (adi1090x-plymouth-themes.override {
          selected_themes = [ "rings" ];
        })
      ];
    };
  };

  # Activation script: write Catppuccin GRUB theme
  system.activationScripts.grubTheme = {
    text = ''
      mkdir -p ${grubThemeDir}

      cat > ${grubThemeFile} <<EOF
# Catppuccin Mocha GRUB theme
desktop-color = #1e1e2e
normal-color  = #cdd6f4
selected-item-color = #f5e0dc
selected-item-highlight-color = #f5c2e7
EOF

      if [ -f "${flakeRoot}/assets/system/theming/boot/background.png" ]; then
        cp "${flakeRoot}/assets/system/theming/boot/background.png" "${grubThemeDir}/background.png"
      fi

      echo "GRUB Catppuccin Mocha theme installed."
    '';
  };
}