{
  perSystem,
  osConfig,
  config,
  inputs,
  pkgs,
  lib,
  ...
}: let
  # inherit (lib.strings) removeSuffix;
  inherit (lib) mkIf mkEnableOption mkDefault mkForce getExe;
  inherit (config.lib.stylix) colors;
  # inherit (osConfig.module.stylix) theme;
  inherit (osConfig.networking) hostName;
  cfg = config.desktop.niri;
  ifLaptop = mkIf (hostName != "dunamis");
  launcher = getExe pkgs.walker;
  lockscreen = getExe pkgs.gtklock;
in {
  imports = with inputs; [
    walker.homeManagerModules.default
  ];
  options = {
    desktop.niri.enable =
      mkEnableOption "enable niri desktop";
  };
  config = mkIf cfg.enable {
    stylix.targets = {
      waybar.enable = false;
      wpaperd.enable = true;
      qt.enable = false;
    };
    dconf.settings = {
      "org/gnome/desktop/wm/preferences" = {
        button-layout = "icon:close";
      };
      "org/gnome/desktop/interface" = {
        icon-theme = config.gtk.iconTheme.name;
        color-scheme =
          if config.stylix.polarity == "dark"
          then lib.mkDefault "prefer-dark"
          else lib.mkDefault "prefer-light";
      };
    };
    gtk = {
      enable = true;
      iconTheme = let
        papirusPackage =
          if (lib.strings.hasPrefix "rose-pine" osConfig.module.stylix.theme)
          then pkgs.papirus-icon-theme.override {color = "indigo";}
          else if (lib.strings.hasPrefix "nord" osConfig.module.stylix.theme)
          then pkgs.papirus-icon-theme.override {color = "nordic";}
          else pkgs.papirus-icon-theme;
      in {
        name =
          if config.stylix.polarity == "dark"
          then "Papirus-Dark"
          else "Papirus-Light";
        package = papirusPackage;
      };
    };
    qt = {
      enable = true;
      platformTheme.name = "gtk3";
    };

    programs.walker = import ./programs/walker {inherit config inputs pkgs;};
    programs.waybar = import ./programs/waybar {inherit config colors getExe ifLaptop pkgs;};
    xdg.configFile.niri = import ./niri.nix {inherit config hostName launcher lockscreen;};
    services = import ./services {inherit pkgs lockscreen getExe perSystem;};

    home.packages = with pkgs;
      [
        # gui libadwaita apps
        celluloid # mpv gui in libadwaita
        gnome-text-editor
        helvum # pipewire patchbay in rust
        junction # app chooser
        loupe # image viewer and editor in rust
        mission-center # task manager in rust (partly)
        nautilus # file manager
        overskride # bluetooth gui in rust
        papers # pdf reader in rust
        pika-backup # borg gui in rust
        pwvucontrol # pipewire gui in rust
        sonusmix # pipewire routing tool in rust
        wdisplays # wlroots display configurator
      ]
      ++ [
        # misc utils
        (ifLaptop brightnessctl)
        dconf
        libnotify
        playerctl
        wl-clipboard-rs # wl-clipboard in rust
      ];

    xdg = {
      mime.enable = true;
      mimeApps = {
        enable = true;
        defaultApplications = let
          file_manager = ["org.gnome.Nautilus.desktop"];
          image_viewer = ["org.gnome.Loupe.desktop"];
          pdf_reader = ["org.gnome.Papers.desktop"];
          video_player = ["io.github.celluloid_player.Celluloid.desktop"];
          web_browser = ["re.sonny.Junction.desktop"];
        in {
          "application/pdf" = pdf_reader;
          "image/jpeg" = image_viewer;
          "image/png" = image_viewer;
          "inode/directory" = file_manager;
          "text/html" = web_browser;
          "video/mp4" = video_player;
          "video/mpeg" = video_player;
          "video/x-matroska" = video_player;
          "video/x-mpeg" = video_player;
          "x-scheme-handler/about" = web_browser;
          "x-scheme-handler/http" = web_browser;
          "x-scheme-handler/https" = web_browser;
          "x-scheme-handler/unknown" = web_browser;
        };
      };
    };
    systemd.user = {
      settings.Manager.DefaultEnvironment = {
        QT_QPA_PLATFORM = "wayland";
        DISPLAY = ":123";
      };
      targets.tray.Unit.Description = "Home Manager System Tray"; # workaround for udiskie
      services = let
        mkGraphicalService = config: graphicalService // config;
        graphicalService = {
          Install.WantedBy = ["niri.service"];
          Unit = {
            Requisite = ["graphical-session.target"];
            PartOf = ["graphical-session.target"];
            After = ["graphical-session.target"];
          };
          Service = {
            Restart = "on-failure";
            TimeoutStopSec = 10;
            RestartSec = 1;
          };
        };
      in {
        udiskie = mkGraphicalService {};
        waybar = mkGraphicalService {};
        network-manager-applet = mkGraphicalService {};
        copyq = mkGraphicalService {
          Service =
            graphicalService.Service
            // {
              Environment = mkForce "QT_QPA_PLATFORM=wayland";
            };
        };
        xwayland-satellite = mkGraphicalService {
          Service =
            graphicalService.Service
            // {
              Type = "simple";
              ExecStart = getExe pkgs.xwayland-satellite + " :123";
            };
        };
        wpaperd = mkGraphicalService {
          Service =
            mkDefault graphicalService.Service;
        };
        walker = mkGraphicalService {};
        # gnome-polkit-agent = mkGraphicalService {
        #   Service =
        #     graphicalService.Service
        #     // {
        #       Type = "simple";
        #       ExecStart = pkgs.polkit_gnome + "/libexec/polkit-gnome-authentication-agent-1";
        #     };
        # };
      };
    };
  };
}