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#!/bin/bash

bkuploc='/path/to/backups'
xsibackupexec='/opath/to/xsibackup'

declare backups=()
declare bkup_dates=()
unset lastcheckday
unset lastcheckweek
unset lastcheckmonth
unset lastcheckquarter

now_long=`date -u '+%F %T'`
now_gen=`date -u -d "$now_long" '+%Y/%m/%d 23:59:59 UTC'`
now2day=`date -u -d "$now_gen-2 day" +%s`
now7day=`date -u -d "$now_gen-7 day" +%s`
now30day=`date -u -d "$now_gen-30 day" +%s`
now90day=`date -u -d "$now_gen-90 day" +%s`
now2year=`date -u -d "$now_gen-730 day" +%s`

for i in $(find $bkuploc -maxdepth 1 -type d -regextype posix-egrep -regex "^/.*[0-9]{14}$" -printf '%f\n'); do
	backups+=("${i:0:4}${i:4:2}${i:6:2}${i:8:2}${i:10:2}${i:12:2}")
done

readarray -td '' bkup_dates < <(printf '%s\0' "${backups[@]}" | sort -rz)

for j in "${bkup_dates[@]}"
do
	a=$(date -u -d "${j:0:4}/${j:4:2}/${j:6:2} ${j:8:2}:${j:10:2}:${j:12:2} UTC" +%s)
	if [ "$a" -ge "$now7day" ] && [ "$a" -lt "$now2day" ]; then
		if [ -z ${lastcheckday+x} ]; then
			lastcheckday="$a"
			b=`date -u -d "$(date -u -d @$lastcheckday +%Y%m%d)" +%s`
			echo "Keep, daily, $bkuploc/$j"
		elif [ "$a" -lt "$b" ]; then
			lastcheckday="$a"
			b=`date -u -d "$(date -u -d @$lastcheckday +%Y%m%d)" +%s`
			echo "Keep, daily, $bkuploc/$j"
		else
			echo "Prune, $bkuploc/$j"
			$xsibackupexec --prune "$bkuploc/$j"
		fi
	elif [ "$a" -ge "$now30day" ] && [ "$a" -lt "$now7day" ]; then
		if [ -z ${lastcheckweek+x} ]; then
			lastcheckweek="$a"
			b=`date -u -d "$(date -u -d @$lastcheckweek '+%Y/%m/%d 23:59:59 UTC') - 7 day" +%s`
			echo "Keep, weekly, $bkuploc/$j"
		elif [ "$a" -le "$b" ]; then
			lastcheckweek="$a"
			b=`date -u -d "$(date -u -d @$lastcheckweek '+%Y/%m/%d 23:59:59 UTC') - 7 day" +%s`
			echo "Keep, weekly, $bkuploc/$j"
		else
			echo "Prune, $bkuploc/$j"
			$xsibackupexec --prune "$bkuploc/$j"
		fi
	elif [ "$a" -ge "$now90day" ] && [ "$a" -lt "$now30day" ]; then
		if [ -z ${lastcheckmonth+x} ]; then
			lastcheckmonth="$a"
			b=`date -u -d "$(date -u -d @$lastcheckmonth '+%Y/%m/%d 23:59:59 UTC') - 30 day" +%s`
			echo "Keep, monthly, $bkuploc/$j"
		elif [ "$a" -le "$b" ]; then
			lastcheckmonth="$a"
			b=`date -u -d "$(date -u -d @$lastcheckmonth '+%Y/%m/%d 23:59:59 UTC') - 30 day" +%s`
			echo "Keep, monthly, $bkuploc/$j"
		else
			echo "Prune, $bkuploc/$j"
			$xsibackupexec --prune "$bkuploc/$j"
		fi
	elif [ "$a" -ge "$now2year" ] && [ "$a" -lt "$now90day" ]; then
		if [ -z ${lastcheckquarter+x} ]; then
			lastcheckquarter="$a"
			b=`date -u -d "$(date -u -d @$lastcheckquarter '+%Y/%m/%d 23:59:59 UTC') - 90 day" +%s`
			echo "Keep, monthly, $bkuploc/$j"
		elif [ "$a" -le "$b" ]; then
			lastcheckquarter="$a"
			b=`date -u -d "$(date -u -d @$lastcheckquarter '+%Y/%m/%d 23:59:59 UTC') - 90 day" +%s`
			echo "Keep, quarterly, $bkuploc/$j"
		else
			echo "Prune, $bkuploc/$j"
			$xsibackupexec --prune "$bkuploc/$j"
		fi
	elif [ "$a" -lt "$now2year" ]; then
		echo "Prune, Older than 2 years $bkuploc/$j"
		$xsibackupexec --prune "$bkuploc/$j"
	fi
done