#!/usr/bin/env bash
# ft-handsctl: turn hand tracking on and off by hand, on the Frame. With it on, your hands show
# through Frametop's screens (the hand cutouts); pinches and grips only move the pointer with
# POINTER_HANDS=1. It doesn't start with SteamVR (hands/run.sh install leaves it off), and it
# stops when SteamVR does.
#
#   ft-handsctl on | off | status | log [lines]
#   ft-handsctl cutouts on|off|state   ft-screens' hand cutouts, without stopping tracking
#   ft-handsctl gestures               watch pinches and grips live (Ctrl+C to stop)
#
# Needs the services installed once: hands/run.sh install (it sets ft-camd's capabilities).
set -euo pipefail
here=$(cd "$(dirname "$(readlink -f "${BASH_SOURCE[0]}")")" && pwd)
units="frametop-camd.service frametop-hands.service"

ask_screens() {  # a command to ft-screens' control socket, and its reply
  python3 - "$1" <<'EOF'
import socket, sys
s = socket.socket(socket.AF_UNIX, socket.SOCK_DGRAM)
s.bind("")
s.settimeout(2)
try:
    s.sendto(sys.argv[1].encode(), "\0ft_screens")
    print(s.recv(512).decode())
except OSError as e:
    sys.exit("ft-screens didn't answer (is the Frametop desktop running?): %s" % e)
EOF
}

case ${1:-status} in
  on)
    systemctl --user -q is-active steamvr.service || { echo "SteamVR isn't running" >&2; exit 1; }
    systemctl --user start $units
    sleep 4
    "$0" status ;;
  off)
    systemctl --user stop $units
    echo "hand tracking off" ;;
  status)
    for u in $units; do echo "$u: $(systemctl --user is-active $u || true)"; done
    journalctl --user -u frametop-hands.service --no-pager -o cat -n 40 |
      grep -E '^ *[0-9.]+s |sets with a hand|cameras:' | tail -2 | cut -c1-160 || true ;;
  log) journalctl --user -u frametop-camd.service -u frametop-hands.service --no-pager -o short -n "${2:-30}" ;;
  cutouts)
    ask_screens "cutouts ${2:-state}" ;;
  gestures) exec python3 "$here/tools/watch_gestures.py" --distance ;;
  *) sed -n '2,11p' "$0" | sed 's/^# \{0,1\}//'; exit 2 ;;
esac