#!/usr/bin/env bash
# rice-idle - screensaver, then lock, when you walk away.
#
#   rice-idle start     start the idle chain (rice-session does this)
#   rice-idle toggle    stay awake on/off
#   rice-idle status    JSON for the control centre
#
# Timings live in ~/.config/rice/idle.conf (seconds):
#   SCREENSAVER=300     idle time before the screensaver
#   LOCK=300            further idle time before the lock
# Nothing fires while a window is fullscreen or audio is playing. Suspending
# always locks first.
set -uo pipefail

run="${XDG_RUNTIME_DIR:-/tmp}/rice"
mkdir -p "$run"
SCREENSAVER=300
LOCK=300
conf="${XDG_CONFIG_HOME:-$HOME/.config}/rice/idle.conf"
[[ -f $conf ]] && . "$conf"

chain_running() { pgrep -u "$UID" -x xidlehook >/dev/null; }

start_chain() {
  xset s off
  chain_running || setsid -f xidlehook \
    --not-when-fullscreen --not-when-audio \
    --timer "$SCREENSAVER" 'rice-screensaver start' 'rice-screensaver stop' \
    --timer "$LOCK" 'rice-lock' '' >/dev/null 2>&1
}

start_sleep_lock() {
  pgrep -u "$UID" -x xss-lock >/dev/null || setsid -f xss-lock --transfer-sleep-lock -- rice-lock >/dev/null 2>&1
}

case "${1:-status}" in
  start)
    start_sleep_lock
    [[ -f $run/stay-awake ]] || start_chain
    ;;
  toggle)
    if [[ -f $run/stay-awake ]]; then
      rm -f "$run/stay-awake"
      start_chain
      rice-notify send "Stay awake off" "Screensaver after $((SCREENSAVER / 60)) min, lock $((LOCK / 60)) min later"
    else
      touch "$run/stay-awake"
      pkill -u "$UID" -x xidlehook
      rice-notify send "Stay awake on" "No screensaver or lock until you turn this off"
    fi
    ;;
  status)
    jq -cn --argjson awake "$([[ -f $run/stay-awake ]] && echo true || echo false)" \
      --argjson screensaver "$SCREENSAVER" --argjson lock "$LOCK" \
      '{awake: $awake, screensaver: $screensaver, lock: ($screensaver + $lock)}'
    ;;
  *) sed -n '2,14p' "$0" | sed 's/^# \{0,1\}//'; exit 2 ;;
esac