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

let
  nomarchyLib = import ../../lib { inherit lib; };
  palette = nomarchyLib.getPalette config.nomarchy.system.theme;

  # Plymouth's Window.SetBackgroundTopColor takes three floats in 0.0–1.0;
  # the .plymouth metadata's ConsoleLogBackgroundColor takes a 0xRRGGBB
  # hex. Compute both from palette.base00 so the boot splash matches the
  # rest of the active theme instead of staying frozen on the hardcoded
  # Tokyo-Night-ish #1a1b26 it used to ship with.
  hex = palette.base00;
  rByte = lib.fromHexString (lib.substring 0 2 hex);
  gByte = lib.fromHexString (lib.substring 2 2 hex);
  bByte = lib.fromHexString (lib.substring 4 2 hex);

  # byte → "0.XXX" decimal string. Nix has no floating-point math, so
  # multiply first, integer-divide, then format. Plymouth tolerates more
  # decimals than this (0.1019 etc.) but three digits matches the visual
  # precision Plymouth renders at and keeps the substitution readable.
  byteToFloat = n:
    let
      thousandths = (n * 1000) / 255;
      s = toString thousandths;
      padded =
        if lib.stringLength s == 1 then "00${s}"
        else if lib.stringLength s == 2 then "0${s}"
        else s;
    in "0.${padded}";

  bgR = byteToFloat rByte;
  bgG = byteToFloat gByte;
  bgB = byteToFloat bByte;

  nomarchy-plymouth = pkgs.stdenv.mkDerivation {
    pname = "nomarchy-plymouth";
    version = "1.0";

    src = ./plymouth;

    installPhase = ''
      mkdir -p $out/share/plymouth/themes/nomarchy
      cp * $out/share/plymouth/themes/nomarchy/

      # Fix path in the plymouth file to point to the nix store
      sed -i "s|/[a-z]*/share/plymouth/themes/nomarchy|$out/share/plymouth/themes/nomarchy|g" \
        $out/share/plymouth/themes/nomarchy/nomarchy.plymouth

      # Substitute the active theme's base00 in both the .script (RGB
      # floats for the Window.SetBackground* calls) and the .plymouth
      # metadata (0xRRGGBB for ConsoleLogBackgroundColor).
      sed -i \
        -e 's|@BG_R@|${bgR}|g' \
        -e 's|@BG_G@|${bgG}|g' \
        -e 's|@BG_B@|${bgB}|g' \
        $out/share/plymouth/themes/nomarchy/nomarchy.script
      sed -i 's|@BG_HEX@|${hex}|g' \
        $out/share/plymouth/themes/nomarchy/nomarchy.plymouth
    '';
  };
in
{
  boot.initrd.systemd.enable = lib.mkDefault true;
  boot.initrd.verbose = lib.mkDefault false;
  console.earlySetup = lib.mkDefault true;
  boot.consoleLogLevel = lib.mkDefault 0;
  boot.plymouth = {
    enable = lib.mkDefault true;
    themePackages = lib.mkDefault [ nomarchy-plymouth ];
    theme = lib.mkDefault "nomarchy";
  };

  boot.kernelParams = lib.mkDefault [ "quiet" "splash" "loglevel=3" "rd.systemd.show_status=false" "rd.udev.log_level=3" "udev.log_priority=3" "boot.shell_on_fail" ];
}