{ config, lib, pkgs, ... }:

let
  inherit (lib) mkIf mkMerge mkThenElse;
  annuaire = config.r6d.machines;
  currentMachine = annuaire."${config.networking.fqdn}";
  flags = currentMachine.configurationFlags;
in

/**
 * Il faut activer `services.xserver.enable = true;` dans configuration.nix
 */
mkIf currentMachine.profiles.isDesktopEnvironment {

  # Services
  # Enable the X11 windowing system.
  services.xserver = {
    # enable = true;
    layout = "fr";
    xkbOptions = "eurosign:e";
    displayManager.lightdm.enable = true;
    windowManager.awesome.enable = true;
    inputClassSections = [''
    Identifier  "Marble Mouse"
    MatchProduct "Logitech USB Trackball"
    MatchIsPointer "on"
    MatchDevicePath "/dev/input/event*"
    Driver "evdev"
    # Physical button #s:     A b D - - - - B C    b = A & D simultaneously;   - = no button
    #Option "ButtonMapping" "1 8 3 4 5 6 7 2 2"   #  For right-hand placement
    #Option "ButtonMapping" "3 8 1 4 5 6 7 2 2"   #  For left-hand placement

    # EmulateWheel refers to emulating a mouse wheel using Marble Mouse trackball.
    Option "EmulateWheel" "true"
    Option "EmulateWheelButton" "8"   # Factory default; use "9" for left-side placement.

    # EmulateWheelInertia specifies how far (in pixels) the pointer must move to
    # generate button press/release events in wheel emulation mode.
    Option "EmulateWheelInertia" "10" # Factory default: 50

    Option "ZAxisMapping" "4 5"
    Option "XAxisMapping" "6 7"       # Disable this for vertical-only scrolling.
    # Emulate3Buttons refers to the act of pressing buttons A and D
    # simultaneously to emulate a middle-click or wheel click.
    Option "Emulate3Buttons" "true"   # Factory default.
    ''];
  };
}