#!/bin/bash
# Auto-disable touchpad when an external mouse is connected, re-enable when removed.
# Watches Hyprland socket for device add/remove events.

TOUCHPAD="pixa3854:00-093a:0274-touchpad"
STATE_FILE="${XDG_RUNTIME_DIR:-/tmp}/touchpad-state"

has_external_mouse() {
    hyprctl devices -j | jq -e '[.mice[] | select(.name != "'"$TOUCHPAD"'" and .name != "pixa3854:00-093a:0274-mouse" and (.name | test("frmw") | not))] | length > 0' >/dev/null 2>&1
}

set_touchpad() {
    hyprctl keyword "device[$TOUCHPAD]:enabled" "$1" >/dev/null
    if [ "$1" = "true" ]; then
        echo "enabled" > "$STATE_FILE"
    else
        echo "disabled" > "$STATE_FILE"
    fi
    # Refresh the waybar indicator (custom/touchpad listens on signal 9).
    pkill -RTMIN+9 waybar 2>/dev/null
}

# Set initial state
if has_external_mouse; then
    set_touchpad false
else
    set_touchpad true
fi

# BT mice may auto-reconnect after boot — recheck after delay
(sleep 10 && if has_external_mouse; then set_touchpad false; fi) &

# Watch for device events
socat -u "UNIX-CONNECT:$XDG_RUNTIME_DIR/hypr/$HYPRLAND_INSTANCE_SIGNATURE/.socket2.sock" - | while read -r line; do
    case "$line" in
        mouseadded\>\>*|mouseremoved\>\>*)
            sleep 0.5
            if has_external_mouse; then
                set_touchpad false
            else
                set_touchpad true
            fi
            ;;
        configreloaded\>\>*)
            sleep 0.5
            if has_external_mouse; then
                set_touchpad false
            else
                set_touchpad true
            fi
            ;;
    esac
done