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

let
  # Paths for theming
  grubThemeDir = "/boot/grub/themes/catppuccin-mocha";
  grubThemeFile = "${grubThemeDir}/theme.txt";
  plymouthThemeDir = "/usr/share/plymouth/themes/catppuccin";
  plymouthSplash = "${flakeRoot}/assets/system/theming/boot/mocha.webp";
in
{
  boot = {
    # Kernel and initrd settings
    initrd = {
      verbose = false;
      kernelModules = [];
    };

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

    # Filesystems supported at boot
    supportedFilesystems = [ "ntfs" ];

    # GRUB loader
    loader.grub = {
      enable = true;
      efiSupport = true;
      devices = [ "/dev/nvme0n1" ];  # <- must point to real disk
      useOSProber = true;
    };
    boot.efi.canTouchEfiVariables = true;

    # Plymouth splashscreen
    plymouth = {
      enable = true;
      theme = "catppuccin";
      themePackages = with pkgs; [
        (adi1090x-plymouth-themes.override {
          selected_themes = [ "spinner" ]; # default, overridden below
        })
      ];
    };
  };

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

      # Write a simple theme.txt using Catppuccin Mocha colors
      cat > ${grubThemeFile} <<EOF
# Catppuccin Mocha GRUB theme
desktop-color = #1e1e2e
normal-color  = #cdd6f4
selected-item-color = #f5e0dc
selected-item-highlight-color = #f5c2e7
EOF

      # Copy background image if it exists
      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."
    '';
  };

  # Activation script: install Plymouth splash image
  system.activationScripts.plymouthTheme = {
    text = ''
      if [ -f "${plymouthSplash}" ]; then
        mkdir -p ${plymouthThemeDir}
        cp "${plymouthSplash}" "${plymouthThemeDir}/splash.png"
        update-alternatives --install /usr/share/plymouth/themes/default.plymouth default.plymouth \
          ${plymouthThemeDir}/splash.png 100
        echo "Plymouth Catppuccin splash installed."
      fi
    '';
  };
}