#!/bin/sh

# checks for a +%Y-%m-%d %H:%M:%S-formated date in the last two lines of a file

# default values:
# 60s*60m*4h
warning=14400
# 60s+60m*24h
critical=86400 

OPTIND=1

while getopts "hF:C:W:" opt; do
    case "$opt" in
    h)
	echo "Usage: $0 [-h] [-w <warning> (default: $warning)] [-c <critical> (default: $critical) -F <filename>]"	
	exit 3
	;;
    W)
	warning=$OPTARG
	;;
    C)
	critical=$OPTARG
	;;
    F)
	file=$OPTARG
	;;
	  *)
	echo "Usage: $0 [-h] [-w <warning> (default: $warning)] [-c <critical> (default: $critical) -F <filename>]"	
	exit 3
    esac
done

shift $((OPTIND-1))

[ "$1" = "--" ] && shift

if [ -z "${file}" ]
then
	echo "ERROR: please provide filename to parse with $0 -F <filename>"
	exit 3
fi

lastdate=$(tail -2 "${file}" | grep -o -E '^[[:digit:]]{4}-[[:digit:]]{2}-[[:digit:]]{2} [[:digit:]]{2}:[[:digit:]]{2}:[[:digit:]]{2}')
lastts=$(date -d "${lastdate}" +%s)
currentts=$(date +%s)

if [ "x${lastts}" != "x" ]
then
	delay=$(echo "${currentts}-${lastts}" | bc)
else
	echo "UNKNOWN: date not found"
	exit 3
fi

message="${file} not updated since ${delay} seconds"

if [ "${delay}" -gt "${critical}" ]
then
	echo "CRITICAL: ${message}"
	exit 2
elif [ "${delay}" -gt "${warning}" ]
then
	echo "WARNING: ${message}"
	exit 1
else
	echo "OK: ${message}"
	exit 0
fi