{
  config,
  lib,
  inputs,
  outputs,
  pkgs,
  timeZone,
  system,
  ...
}:
let
  supportedDesktops = [ "niri" ];
  supportedDesktopsStr = lib.strings.concatStringsSep ", " supportedDesktops;
  deskCfg = config.deskCfg;
in
{
  options.deskCfg = {
    de = lib.mkOption {
      default = "niri";
      type = lib.types.str;
      description = "Desktop Environment";
    };
    userName = lib.mkOption {
      type = lib.types.str;
      description = "Main username for system";
    };
    hostName = lib.mkOption {
      type = lib.types.str;
      description = "Hostname for system";
    };
    fullName = lib.mkOption {
      type = lib.types.str;
      default = "User";
      description = "Full display name for the user";
    };
    installGaming = lib.mkOption {
      type = lib.types.bool;
      default = true;
      description = "Whether to install gaming software or not";
    };
  };

  imports = [
    ../shared/modules/user/main_user.nix
    modules/niri/niri_conf.nix
    ../shared/modules/system/power_manager.nix
    ../shared/modules/system/noctalia-system.nix
  ];

  config = {
    assertions = [
      {
        assertion = builtins.elem deskCfg.de supportedDesktops;
        message = "Unsupported desktop environment: ${deskCfg.de}\nSupported DE's: ${supportedDesktopsStr}";
      }
    ];

    # Stylix theming - auto-generated light theme from wallpaper
    stylix = {
      enable = true;
      image = ./kiki_background.jpg;
      # Auto-generate color scheme from wallpaper
      polarity = "light";
      # System-wide cursor
      cursor = {
        package = pkgs.bibata-cursors;
        name = "Bibata-Modern-Classic";
        size = 32;
      };
      # Fonts
      fonts = {
        serif = {
          package = pkgs.lato;
          name = "Lato";
        };
        sansSerif = {
          package = pkgs.lato;
          name = "Lato";
        };
        monospace = {
          package = pkgs.maple-mono.NF;
          name = "Maple Mono NF";
        };
        emoji = {
          package = pkgs.noto-fonts-color-emoji;
          name = "Noto Color Emoji";
        };
        sizes = {
          applications = 14;
          desktop = 14;
          popups = 14;
          terminal = 14;
        };
      };

      # Icon theme for tray applets (nm-applet, etc.)
      # Note: "Reversal-dark" has dark icons (for light backgrounds)
      #       "Reversal" has light icons (for dark backgrounds)
      iconTheme = {
        enable = true;
        package = pkgs.reversal-icon-theme;
        light = "Reversal-dark";
        dark = "Reversal";
      };

      # Disable plymouth styling (use default)
      targets.plymouth.enable = false;
    };

    nixpkgs.overlays = [
      inputs.nur.overlays.default
    ];

    # Intel graphics acceleration (Framework 12)
    hardware.graphics.enable = true;
    hardware.enableRedistributableFirmware = true;

    # Enable flakes feature
    nix.settings.experimental-features = [
      "nix-command"
      "flakes"
    ];
    nixpkgs.config.allowUnfree = true;

    boot = {
      plymouth = {
        enable = true;
        theme = "kiki-pixel";  # Options: "kiki" (waifu2x upscaled) or "kiki-pixel" (pixel art)
        themePackages = [
          (pkgs.runCommand "plymouth-kiki-theme" { } ''
            mkdir -p $out/share/plymouth/themes/kiki
            cp -r ${./kiki-plymouth-theme/kiki}/* $out/share/plymouth/themes/kiki/
            substituteInPlace $out/share/plymouth/themes/kiki/kiki.plymouth \
              --replace-fail "@IMAGEDIR@" "$out/share/plymouth/themes/kiki"
            substituteInPlace $out/share/plymouth/themes/kiki/kiki.script \
              --replace-fail "@IMAGEDIR@" "$out/share/plymouth/themes/kiki"
          '')
          (pkgs.runCommand "plymouth-kiki-pixel-theme" { } ''
            mkdir -p $out/share/plymouth/themes/kiki-pixel
            cp -r ${./kiki-plymouth-theme/kiki-pixel}/* $out/share/plymouth/themes/kiki-pixel/
            substituteInPlace $out/share/plymouth/themes/kiki-pixel/kiki-pixel.plymouth \
              --replace-fail "@IMAGEDIR@" "$out/share/plymouth/themes/kiki-pixel"
            substituteInPlace $out/share/plymouth/themes/kiki-pixel/kiki-pixel.script \
              --replace-fail "@IMAGEDIR@" "$out/share/plymouth/themes/kiki-pixel"
          '')
        ];
      };

      # Enable systemd in initrd for better LUKS unlocking with Plymouth
      initrd.systemd.enable = true;

      # Enable "Silent Boot"
      consoleLogLevel = 0;
      initrd.verbose = false;
      kernelParams = [
        "quiet"
        "splash"
        "boot.shell_on_fail"
        "loglevel=3"
        "rd.systemd.show_status=false"
        "rd.udev.log_level=3"
        "udev.log_priority=3"
      ];
      # Hide the OS choice for bootloaders.
      loader.timeout = 1;
      # Use the systemd-boot EFI boot loader.
      loader.systemd-boot.enable = true;
      loader.efi.canTouchEfiVariables = true;
      # Use latest kernel packages
      kernelPackages = pkgs.linuxPackages_latest;
    };

    networking.hostName = deskCfg.hostName;
    networking.networkmanager.enable = true;
    networking.wireless.iwd.enable = true;

    time.timeZone = timeZone;

    main_user = {
      enable = true;
      userName = deskCfg.userName;
      fullName = deskCfg.fullName;
      isDesktopUser = true;
      extraGroups = [ "corectrl" ];
    };

    power_manager = {
      enable = true;
      backend = "power-profiles-daemon";  # Required for Noctalia power profile widget
    };

    # Enable Noctalia shell system services
    noctaliaSystem.enable = true;

    niriwm = {
      enable = true;
      useNonFree = true;
      user = deskCfg.userName;
      installGaming = deskCfg.installGaming;
      systemPackages = with pkgs; [
        libreoffice
      ];
    };

    environment.systemPackages = with pkgs; [
      cryptsetup
    ];

    programs.niri.enable = true;
    # For electron apps in wayland
    environment.sessionVariables.NIXOS_OZONE_WL = "1";

    services.greetd = {
      enable = true;
      settings = rec {
        initial_session = {
          command = "${pkgs.niri}/bin/niri-session";
          user = deskCfg.userName;
        };
        default_session = initial_session;
      };
    };

    system.stateVersion = "23.11";
  };
}