#!/bin/bash
set -euo pipefail

default_sleep=10

source ${HOME}/bin/script_framework.sh

time=${1:-}
[ -z "${time}" ] && fail "No time specified"

tdiff=$(($(date -d "$1" +%s) - $(date +%s)))
[ $tdiff -gt 0 ] || tdiff=$((tdiff + 86400))

ttime=$(date -d "now + ${tdiff} seconds" +%s)

step "Sleeping ${tdiff}s until $(date -d "now + ${tdiff} seconds" "+%Y-%m-%d %H:%M:%S")..."
while [ $(date +%s) -lt $ttime ]; do
  tremain=$(( ttime - $(date +%s) ))
  [ $tremain -gt $default_sleep ] && sleep $default_sleep || sleep $tremain
done