# Tablet mode support for 2-in-1 convertibles (currently wired to the
# ThinkPad X1 Yoga Gen 6).
#
# In tablet mode (screen folded flat behind the keyboard) the display should
# follow the device orientation and an on-screen keyboard should appear when a
# text field is focused. This module provides that in three pieces:
#
#   1. The NixOS half (here): grants petere membership of the `input` group so
#      the user-level daemon can read the tablet-mode evdev switch
#      (/dev/input/event17, "Intel HID switches", SW_TABLET_MODE), and wires
#      in the home-manager module (hyprland-tablet.nix) via sharedModules.
#
#   2. A user-level Python daemon (`hyprland-tablet` daemon) that:
#        - watches SW_TABLET_MODE via python-evdev;
#        - parses `monitor-sensor` output for accelerometer orientation
#          (iio-sensor-proxy, already running on this host);
#        - applies `transform` to the eDP-1 monitor (and matching per-device
#          transforms for touch/tablet inputs) via hyprctl;
#        - starts/stops `wvkbd --auto` so a virtual keyboard shows when a text
#          input is focused while in tablet mode.
#
#   3. A `hyprland-tablet` CLI (status / keyboard toggle) used by the
#      QuickShell bar chip and the SUPER+CTRL+K keybind.
#
# Why not iio-hyprland? It rotates on every accelerometer reading regardless
# of tablet mode; this host's iio-sensor-proxy build has no hinge support, so
# orientation must be gated on the SW_TABLET_MODE switch ourselves.
{
  config,
  lib,
  pkgs,
  ...
}:

let
  cfg = config.my.hardware.tabletMode;
in
{
  options.my.hardware.tabletMode = {
    enable = lib.mkEnableOption "tablet-mode auto-rotation + on-screen keyboard for 2-in-1 convertibles";
  };

  config = lib.mkIf cfg.enable {
    # petere needs to read /dev/input/event17 (root:input 660) for the
    # SW_TABLET_MODE switch. The Intel HID switch device is unique to this
    # Yoga, so we match it explicitly and grant it to petere. This works for
    # the current session immediately -- no re-login needed to pick up a group.
    users.users.petere.extraGroups = lib.mkBefore [ "input" ];
    services.udev.extraRules = ''
      KERNEL=="event*", SUBSYSTEM=="input", ATTRS{name}=="Intel HID switches", OWNER="petere", MODE="0660", TAG+="uaccess"
    '';

    home-manager.sharedModules = [
      ../../home-manager/modules/hyprland-tablet.nix
    ];
  };
}