{ config, pkgs, ... }:

let
  secrets = import ./secrets.nix;
in {
  services.xserver.enable = true;
  services.xserver.layout = "us,ru"; # see also home-manager.nix
  services.xserver.xkbOptions = "ctrl:nocaps,grp:rctrl_toggle"; # see also home-manager.nix
  services.xserver.videoDrivers = [ "nvidia" ];
  services.xserver.windowManager.xmonad.enable = true;
  services.xserver.windowManager.xmonad.enableContribAndExtras = true;

  services.xserver.xautolock = {
    enable = true;

    time = 5;                   # minutes
    locker = "${pkgs.i3lock}/bin/i3lock -n -c 000000";

    notify = 10;                # seconds
    notifier = "${pkgs.libnotify}/bin/notify-send \"Locking in 10 seconds\"";

    killtime = 20;              # minutes
    killer = "${pkgs.systemd}/bin/systemctl suspend";

    extraOptions = [ "-secure" ];
  };

  services.redshift = {
    enable = true;
    latitude = secrets.latitude;
    longitude = secrets.longitude;
  };

  programs.dconf.enable = true;
  programs.light.enable = true;

  hardware.opengl.extraPackages = [ pkgs.vaapiVdpau ];

  sound.enable = true;
  hardware.pulseaudio.enable = true;

  environment.variables = {
    GDK_SCALE = "2";
    GDK_DPI_SCALE = "0.4";
  };

  fonts = {
    enableFontDir = true;
    enableGhostscriptFonts = true;
    fonts = with pkgs; [
      ubuntu_font_family
    ];
  };

  environment.etc."X11/xorg.conf.d/60-trackball.conf".text = ''
    Section "InputClass"
      Identifier      "Marble Mouse"
      MatchProduct    "Logitech USB Trackball"
      MatchIsPointer  "on"
      MatchDevicePath "/dev/input/event*"
      Driver          "evdev"

      Option "ButtonMapping"       "3 8 1 4 5 6 7 2 2"
      Option "EmulateWheel"        "true"
      Option "EmulateWheelButton"  "9"
      Option "EmulateWheelInertia" "10"
      Option "ZAxisMapping"        "4 5"
      Option "Emulate3Buttons"     "true"
    EndSection
  '';

  environment.etc."X11/xorg.conf.d/61-trackpoint.conf".text = ''
    Section "InputClass"
      Identifier      "Trackpoint Wheel Emulation"
      Driver          "evdev"
      MatchProduct    "TPPS/2 Elan TrackPoint"
      MatchDevicePath "/dev/input/event*"

      Option "EmulateWheel"                       "true"
      Option "EmulateWheelButton"                 "2"
      Option "Emulate3Buttons"                    "false"
      Option "XAxisMapping"                       "6 7"
      Option "YAxisMapping"                       "4 5"
      Option "Device Accel Constant Deceleration" "0.5"
    EndSection
  '';

  services.xserver.displayManager.lightdm = {
    background = "black";
    greeters.mini = {
      enable = true;
      user = "user";
    };
  };

  programs.chromium = {
    enable = true;
    extensions = [
      "cjpalhdlnbpafiamejdnhcphjbkeiagm" # uBlock Origin
      "gcbommkclmclpchllfjekcdonpmejbdp" # HTTPS Everywhere
      "dbepggeogbaibhgnhhndojpepiihcmeb" # Vimium
      "aapbdbdomjkkjkaonfhkkikfgjllcleb" # Google Translate
      "naepdomgkenhinolocfifgehidddafch" # Browserpass
    ];
    extraOpts = {
      DefaultBrowserSettingEnabled = true;

      TranslateEnabled = false;
      SpellcheckEnabled = false;
      SpellCheckServiceEnabled = false;
      PrintingEnabled = false;
      SearchSuggestEnabled = false;
      PasswordManagerEnabled = false;
      SafeBrowsingEnabled  = false;
      AutofillAddressEnabled = false;
      AutofillCreditCardEnabled = false;
      MetricsReportingEnabled = false;
      BuiltInDnsClientEnabled = false;

      SyncDisabled = true;
      BlockThirdPartyCookies = true;

      SigninAllowed = false;
      AudioCaptureAllowed = false;
      VideoCaptureAllowed = false;
      SSLErrorOverrideAllowed = false;
      AutoplayAllowed = false;

      # 0 = Disable browser sign-in
      BrowserSignin = 0;

      DefaultSearchProviderEnabled = true;
      DefaultSearchProviderSearchURL = "https://duckduckgo.com/"
        + "?kae=d&k1=-1&kc=1&kav=1&kd=-1&kh=1&q={searchTerms}";

      # Do not allow any site to show desktop notifications
      DefaultNotificationsSetting = 2;
      # Do not allow any site to track the users' physical location
      DefaultGeolocationSetting = 2;
      # Block the Flash plugin
      DefaultPluginsSetting = 2;
    };
  };

  networking.localCommands = ''
    mkdir -p /tmp/chromium && chown user:users /tmp/chromium
    mkdir -p /tmp/downloads && chown user:users /tmp/downloads
  '';
}