#!/bin/bash

# Important to format it as HHMM using 24 hour clock. So hours are from 00 to 23.
STARTTIME="0500"
STOPTIME="0700"

# Wait time between jobs. Must be in seconds. MAX must be less time than the difference between START and STOP.
MAXWAITTIME="3600"
MINWAITTIME="1800"

# Because long version hasn't run yet, we use 0. it will change to 1 when it has run.
HASRUN=0

if [[ ${STARTTIME} -gt ${STOPTIME} ]]; then
  STARTTIME="${STARTTIME}"
else
  STARTTIME="1${STARTTIME}"
fi

STOPTIME="1${STOPTIME}"

# {other declarations and functions go here}

function WhichJob {
  CURRENTTIME="$(date +%H%M)"
  if ( StartAfterStop && [[ "${CURRENTTIME}" -lt ${STARTTIME} ]] ) || ! StartAfterStop; then
    CURRENTTIME="1${CURRENTTIME}"
  fi
  if HasRun && [[ ${CURRENTTIME} -le ${STOPTIME} ]] && [[ ${CURRENTTIME} -ge ${STARTTIME} ]]; then
    HASRUN=1
    LongVersion
  elif ! HasRun && [[ ${CURRENTTIME} -le ${STOPTIME} ]] && [[ ${CURRENTTIME} -ge ${STARTTIME} ]]; then
    HASRUN=1
    ShortVersion
  else
    HASRUN=0
    ShortVersion
  fi
}

function HasRun {
  # Use return to send the contents of ${HASRUN} to the if statement. 0 is true and 1 is false.
  return ${HASRUN} # We return the HASRUN variable as an error code.
}

function StartAfterStop {
  # Use return to send a 0 or 1 to the if statement. 0 is true and 1 is false.
  if [[ ${STARTTIME} -lt "10000" ]]; then
    return 0
  else
    return 1
  fi
}

function LongVersion {
  echo "Run Long Job"
}

function ShortVersion {
  echo "Run Short Job"
}

while true; do
  SECONDS=0
  WhichJob
  RUNTIME=${SECONDS}
  if [[ ${RUNTIME} -gt ${MAXWAITTIME} ]] || [[ $((${MAXWAITTIME}-${RUNTIME})) -lt ${MINWAITTIME} ]]; then
    sleep ${MINWAITTIME}
  else
    sleep ${MAXWAITTIME}
  fi
done