{ lib, config, ... }:

let
  # --- Module variables ---
  moduleName = "stylix";
  username   = config.defaultUser or "henrov";

  # Assets directory
  assetPath =
    if builtins.pathExists ../../../assets/system/theming/${moduleName}
    then ../../../assets/system/theming/${moduleName}
    else null;

  # Read all files if assets exist
  programFiles =
    if assetPath != null
    then builtins.readDir assetPath
    else {};

  files = lib.genAttrs (builtins.attrNames programFiles) (name: {
    src = "${assetPath}/${name}";
  });

  # Top-level toggle for this module
  enableProgram = config.enableStylix or false;

  # Stylix self-contained configuration
  stylixCfg = {
    enable = true;

    base16Scheme = ../../../assets/system/theming/stylix/catppuccin-mocha.yaml;
    image        = ../../../assets/hyprland/wallpaperstuff/pictures/wall1.jpg;
    polarity     = "dark";

    cursor = {
      package = "phinger-cursors"; # symbolic reference
      name    = "phinger-cursors-light";
      size    = 24;
    };

    fonts = {
      monospace = {
        package = "nerd-fonts-fira-code";
        name    = "Fira Code Nerd Font";
      };
      sansSerif = {
        package = "lato";
        name    = "Lato";
      };
    };

    icons = {
      enable = true;
      package = "papirus-icon-theme";
      dark    = "Papirus-Dark";
      light   = "Papirus-Light";
    };
  };
in
{
  # --- Top-level toggle option ---
  options.enableStylix = lib.mkEnableOption "Enable Stylix system theming";

  # --- Only apply configuration if enabled ---
  config = lib.mkIf enableProgram {

    # --- Stylix dendritic app definition ---
    stylixModule = {
      enable    = true;
      assetsDir = assetPath;
      files     = files;
      user      = username;
      theme     = "catppuccin-mocha";
      polarity  = "dark";
    };

    # --- Stylix theming config ---
    stylix = stylixCfg;

    # --- Optional wallpaper helper (dendritic) ---
    wallpaperHelper = {
      enable   = true;
      packages = [ "feh" "st" ]; # symbolic package names
    };

    # --- Cursor environment variables ---
    home-manager.users.${username}.home.sessionVariables = {
      XCURSOR_THEME    = stylixCfg.cursor.name;
      XCURSOR_SIZE     = toString stylixCfg.cursor.size;
      HYPRCURSOR_THEME = stylixCfg.cursor.name;
      HYPRCURSOR_SIZE  = toString stylixCfg.cursor.size;
    };

    # --- Optional systemd service to sync assets ---
    systemd.services."${moduleName}-sync" = {
      description = "Sync ${moduleName} configuration assets";
      wantedBy    = [ "multi-user.target" ];
      wants       = [ "network-online.target" ];
      after       = [ "network-online.target" ];

      serviceConfig = {
        Type = "oneshot";
        ExecStart = ''
          set -euo pipefail
          if [ -d "${assetPath}" ]; then
            for f in ${lib.concatStringsSep " " (builtins.attrNames files)}; do
              cp -u "${assetPath}/$f" "/home/${username}/.config/${moduleName}/$f"
            done
          fi
        '';
      };

      restartTriggers = [ assetPath ];
      path = [];
    };
  };
}