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#!/usr/bin/zsh

set -x

PRETEND="no"

function run_rsnapshot() {
  rsnapshot -c /etc/rsnapshot.conf $1
}

while true; do

  NOW=$(date +"%Y-%m-%d %H:%M:%S")
  TIME=$(date --date="$NOW" +"%H:%M:%S")
  DATE=$(date --date="$NOW" +"%Y-%m-%d")
  TOMORROW=$(date --date="$NOW + 1 day" +"%Y-%m-%d")
  OVERNIGHT="no"

  if dateutils.dtest "$TIME" --gt "20:00:00" && dateutils.dtest "$NOW" --lt "$TOMORROW 08:00:00"; then
    if [[ $PRETEND != "yes" ]]; then
      echo "daily:beta"
      run_rsnapshot beta
    fi

    if [[ $(date +%A) == "Sunday" ]]; then
      echo "Sunday -> weekly:gamma"
      if [[ $PRETEND != "yes" ]]; then
        sleep 1800 # wait 30 minutes
        run_rsnapshot gamma
      fi
    fi

    if [[ $(date +%d) == "01" ]]; then
      echo "1st of a month -> monthly:delta"
      if [[ $PRETEND != "yes" ]]; then
        sleep 1800 # wait 30 minutes
        run_rsnapshot delta
      fi
    fi

    if [[ $(date +"%m-%d") == "01-01" ]]; then
      echo "1st day of the year -> yearly:epsilon"
      if [[ $PRETEND != "yes" ]]; then
        sleep 1800 # wait 30 minutes
        run_rsnapshot epsilon
      fi
    fi

    wakeup=$(date -d "$TOMORROW 08:00:00" +'%Y%m%d%H%M%S')
    next=$(date -d "$TOMORROW 08:00:00" +'%s')
    OVERNIGHT="yes"

  else

    echo "hourly:alpha"

    if [[ $PRETEND != "yes" ]]; then
      run_rsnapshot alpha
    fi

    wakeup=$(date -d "now + 1 hour" +'%Y%m%d%H5959')
    next=$(date -d "now + 1 hour" +'%s')
    OVERNIGHT="no"

  fi

  echo "NEXT"
  echo $next
  echo "WAKEUP"
  echo $wakeup

  sleep 15 # wait 15 seconds

  if [[ $PRETEND != "yes" ]]; then
    if [[ $OVERNIGHT == "yes" && $(users) == "" ]]; then
      rtcwake -m mem --date $wakeup
    else
      sleep $(( $next - $(date +%s) ))
    fi
  fi

done