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

let
  # Path to store GRUB theme
  grubThemeDir = "/boot/grub/themes/catppuccin-mocha";

  # Catppuccin Mocha colors
  catppuccin = {
    base      = "#1e1e2e"; # background
    mantle    = "#181825";
    crust     = "#11111b";
    text      = "#cdd6f4";
    rosewater = "#f5e0dc";
    flamingo  = "#f2cdcd";
    pink      = "#f5c2e7";
    mauve     = "#cba6f7";
    red       = "#f38ba8";
    maroon    = "#eba0ac";
    peach     = "#fab387";
    yellow    = "#f9e2af";
    green     = "#a6e3a1";
    teal      = "#94e2d5";
    sky       = "#89dceb";
    sapphire  = "#74c7ec";
    blue      = "#89b4fa";
    lavender  = "#b4befe";
  };

  # Helper to recursively write theme files
  grubThemeFile = "${grubThemeDir}/theme.txt";

in
{
  boot = {
    initrd = {
      verbose = false;
      kernelModules = [];
    };

    extraModulePackages = [];
    kernelPackages = pkgs.linuxPackages_latest;
    kernelParams = [ "quiet" ];
    consoleLogLevel = 0;

    plymouth.enable = true;
    plymouth.theme = "spinner"; # default theme; we can override with custom image

    supportedFilesystems = [ "ntfs" ];

    loader = {
      systemd-boot.enable = true;
      systemd-boot.configurationLimit = 10;
      efi.canTouchEfiVariables = true;
      timeout = 5;
    };
  };

  # GRUB theme setup using activation script
  system.activationScripts.grubTheme = {
    text = ''
      mkdir -p ${grubThemeDir}

      # Write GRUB theme using Catppuccin colors
      cat > ${grubThemeFile} <<EOF
      # Catppuccin Mocha GRUB theme
      desktop-color = ${catppuccin.base}
      normal-color  = ${catppuccin.text}
      selected-item-color = ${catppuccin.rosewater}
      selected-item-highlight-color = ${catppuccin.pink}
      EOF

      # Optional: copy a matching PNG for background if exists in flake assets
      if [ -f "${flakeRoot}/assets/grub-bg.png" ]; then
        cp "${flakeRoot}/assets/grub-bg.png" "${grubThemeDir}/background.png"
      fi

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

  # Optionally, configure Plymouth to use your Catppuccin splash image
  system.activationScripts.plymouthTheme = {
    text = ''
      if [ -f "${flakeRoot}/assets/system/theming/mocha.webp" ]; then
        mkdir -p /usr/share/plymouth/themes/catppuccin
        cp "${flakeRoot}//assets/system/theming/mocha.webp" /usr/share/plymouth/themes/catppuccin/splash.png
        update-alternatives --install /usr/share/plymouth/themes/default.plymouth default.plymouth /usr/share/plymouth/themes/catppuccin/splash.png 100
      fi
    '';
  };
}