#!/usr/bin/env bash

# State file lives in the user's runtime dir (tmpfs, cleared on logout).
# Using XDG_RUNTIME_DIR avoids /tmp collisions on multi-user systems.
export STATUS_FILE="$XDG_RUNTIME_DIR/touchpad.status"

# Resolve the touchpad's libinput device name dynamically. A previous version
# of this script hardcoded one machine's name ("synaptics-tm3053-009") —
# `hyprctl keyword device[...]:enabled` silently no-ops when the selector
# matches no device, so on any other touchpad (e.g. this Framework 12's
# "pixa3854:...-touchpad") the toggle just did nothing. `mice` entries carry
# no explicit "type: touchpad" field, but libinput's generated name reliably
# includes "touchpad" as a substring.
TOUCHPAD_NAME="$(hyprctl devices -j | jq -r '.mice[] | select(.name | test("touchpad"; "i")) | .name' | head -n1)"

if [[ -z "$TOUCHPAD_NAME" ]]; then
    notify-send -u critical "Touchpad toggle" "No touchpad device found"
    exit 1
fi

enable_touchpad() {
    printf "true" >"$STATUS_FILE"
    notify-send -u normal "Enabling Touchpad"
    # hyprlua's config is Lua-generated, not the classic hyprlang parser, so
    # `hyprctl keyword device[...]:enabled ...` fails outright ("keyword can't
    # work with non-legacy parsers. Use eval."). hl.device({...}) is the Lua
    # API's live-reachable equivalent (same hl.* eval bridge eww's workspace
    # switching uses) — see hypr/hyprland.lua's own hl.device() block.
    hyprctl eval "hl.device({name='$TOUCHPAD_NAME', enabled=true})"
}

disable_touchpad() {
    printf "false" >"$STATUS_FILE"
    notify-send -u normal "Disabling Touchpad"
    hyprctl eval "hl.device({name='$TOUCHPAD_NAME', enabled=false})"
}

# If no status file exists yet, treat as "enabled" (first run after login).
if ! [ -f "$STATUS_FILE" ]; then
  enable_touchpad
else
  # Toggle based on the persisted state: true → disable, false → enable.
  if [ "$(cat "$STATUS_FILE")" = "true" ]; then
    disable_touchpad
  elif [ "$(cat "$STATUS_FILE")" = "false" ]; then
    enable_touchpad
  fi
fi