# Hyprland under uwsm, the greetd login screen, audio, Bluetooth, fonts and the
# system side of theming.
{
  config,
  lib,
  pkgs,
  ...
}:
let
  greetdFiles = ../../config/greetd;
in
{
  programs.hyprland = {
    enable = true;
    # uwsm starts Hyprland as a systemd unit and brings up
    # graphical-session.target, which the user services in
    # modules/home/services.nix hang off.
    withUWSM = true;
  };
  programs.hyprlock.enable = true;

  xdg.portal = {
    enable = true;
    # File pickers and settings for GTK apps; screen sharing comes from
    # xdg-desktop-portal-hyprland, which programs.hyprland adds.
    extraPortals = [ pkgs.xdg-desktop-portal-gtk ];
  };

  # --- Login screen -------------------------------------------------------------

  # gtkgreet in a small Hyprland of its own, blurred over the wallpaper. Same
  # files as /etc/greetd on CachyOS; see config/greetd.
  services.greetd = {
    enable = true;
    settings = {
      terminal.vt = 1;
      default_session = {
        command = "${config.programs.hyprland.package}/bin/start-hyprland -- --config /etc/greetd/hyprland.lua";
        user = "greeter";
      };
    };
  };
  environment.etc = {
    "greetd/hyprland.lua".source = "${greetdFiles}/hyprland.lua";
    "greetd/hyprpaper.conf".source = "${greetdFiles}/hyprpaper.conf";
    "greetd/style.css".source = "${greetdFiles}/style.css";
    "greetd/session.sh".source = "${greetdFiles}/session.sh";
    "greetd/wallpapers/wallpaper.jpg".source = ../../config/hypr/wallpaper.jpg;
  };

  # The greeter user has no settings of its own; these system-wide GSettings
  # defaults give gtkgreet the desktop's cursor. They replace
  # 99_greeter-cursor.gschema.override from CachyOS.
  programs.dconf = {
    enable = true;
    profiles.user.databases = [
      {
        settings."org/gnome/desktop/interface" = {
          cursor-theme = "BreezeX-Black";
          cursor-size = lib.gvariant.mkInt32 28;
          color-scheme = "prefer-dark";
        };
      }
    ];
  };

  # --- Audio, Bluetooth, devices --------------------------------------------------

  services.pipewire = {
    enable = true;
    alsa.enable = true;
    alsa.support32Bit = true;
    pulse.enable = true;
    jack.enable = true;
  };
  services.pulseaudio.enable = false;

  hardware.bluetooth = {
    enable = true;
    powerOnBoot = true;
  };
  services.blueman.enable = true;

  services.upower.enable = true;
  services.udisks2.enable = true;
  services.gvfs.enable = true;
  security.polkit.enable = true;
  # Secret Service (what Electron apps and libsecret store passwords in) from
  # KWallet's ksecretd, started on demand over D-Bus, as on CachyOS. Not GNOME
  # Keyring: it would claim the same D-Bus name.
  services.dbus.packages = [ pkgs.kdePackages.kwallet ];

  # Battery of the Logitech mouse in the control centre (mouse-battery.sh).
  hardware.logitech.wireless.enable = true;

  # --- Fonts -------------------------------------------------------------------

  # The fonts installed on CachyOS. kitty.conf asks for JetBrains Mono, which
  # was never installed there, so kitty has been using Noto Sans Mono; add
  # nerd-fonts.jetbrains-mono here to get the font the config names.
  fonts.packages = with pkgs; [
    noto-fonts
    noto-fonts-cjk-sans
    noto-fonts-color-emoji
    nerd-fonts.noto
    nerd-fonts.meslo-lg
    nerd-fonts.fantasque-sans-mono
    dejavu_fonts
    liberation_ttf
    ttf-bitstream-vera
    open-sans
    cantarell-fonts
    adwaita-fonts
    font-awesome
    wqy_zenhei
  ];

  # --- Theming (system side) ------------------------------------------------------

  # Qt apps use qt6ct + Kvantum (QT_QPA_PLATFORMTHEME is set in hyprland.lua).
  qt = {
    enable = true;
    platformTheme = "qt5ct";
    style = "kvantum";
  };

  environment.systemPackages = with pkgs; [
    # The greeter runs these from /etc/greetd/hyprland.lua.
    gtkgreet
    hyprpaper
    kitty
    procps

    breezex-cursor
    papirus-icon-theme
    kdePackages.breeze-icons
    gnome-themes-extra
    adwaita-icon-theme
    kdePackages.qtstyleplugin-kvantum
    libsForQt5.qtstyleplugin-kvantum
    qt6Packages.qt6ct
  ];
}