#!/bin/bash

SYSTEMCTL="$(type -P systemctl)"
PARAMETER="$*"
STATUS="is-active"


#
#status
#	is-active
#	is-enabled
#
#pid
#
#Laufzeit
# systemctl show bluetooth.service --property=ActiveEnterTimestampMonotonicq
# Umrechung: date -d @"$(echo "$(date -u +%s) - <TimeStamp>" | bc)"

# systemctl show bluetooth.service --property=ActiveEnterTimestamp,MainPID,ActiveState,UnitFileState

function hilfetext(){
	cat <<- EOF

	$(basename "$0") [OPTION...] 
	  Options:
	  -s | --status
	  -t | --timestamp
	  -u | --unit
	  --perfdata
	  -p | --pid
	  -h | --help

	EOF
}

function ParameterEvaluation(){

	options=$(getopt -o hps:tu: --long help --long pid --long perfdata --long status: --long timestamp --long unit: -- "$@")

	#Option nicht verfügbar
	[ "$?" -eq "0" ] || {
		echo "Incorrect option provided"
		exit 1
	}

	eval set -- "$options"
	while true; do
		case "$1" in
			"-p"|"--pid")
				PID="1"
			;;
			"--perfdata")
				PERFDATA="1"
			;;
			"-s"|"--status (default: is-active")
				shift; # The arg is next in position args
				STATUS="$1"
			;;
			"-u"|"--unit")
				shift; # The arg is next in position args
				UNIT="$1"
			;;
			"-t"|"--timstamp")
				TIMESTAMP="1"
			;;
			"-h"|"--help")
				hilfetext
				exit 0
			;;
			
			"--")
				shift
				break
			;;
		esac
		shift
	done
}

#Prüfen, ob hddtemp installiert ist
if [ ! -x "$SYSTEMCTL" ]
then
	echo "systemctl nicht gefunden"
	exit 1
fi

#Wenn keine Option oder Argument angegeben wurde, wird die Hilfe ausgegeben
if [ -z "$PARAMETER" ]
then
	hilfetext
	exit 0
fi

ParameterEvaluation "$0" "$@"

#declare $(systemctl show "$UNIT" --property=ActiveEnterTimestampMonotonic,MainPID,ActiveState,UnitFileState)
RESULT=$(systemctl show "$UNIT" --property=ActiveEnterTimestamp,MainPID,ActiveState,UnitFileState)
ActiveEnterTimestamp=$(echo "$RESULT" | grep ActiveEnterTimestamp | cut -d "=" -f 2)
MainPID=$(echo "$RESULT" | grep MainPID | cut -d "=" -f 2)
ActiveState=$(echo "$RESULT" | grep ActiveState | cut -d "=" -f 2)
UnitFileState=$(echo "$RESULT" | grep UnitFileState | cut -d "=" -f 2)

#Debug
#echo -e "ActiveEnterTimestamp:\t$ActiveEnterTimestamp"
#echo -e "MainPID:\t$MainPID"
#echo -e "ActiveState:\t$ActiveState"
#echo -e "UnitFileState:\t$UnitFileState\n"

#Wenn die Unit oder der Status nicht gesetz
if [ -z "$UNIT" ]
then
	echo -e "Unit nicht gesetzt"
	exit 1
fi

#Debug
#echo -e "STATUS:\t\"$STATUS\"\n"


if [ "$STATUS" != "is-enabled" ] && [ "$STATUS" != "is-active" ]
then
	echo -e "Status must be \"is-enabled\" or \"is-active\" "
	exit 1
fi

##############################################
# Zusatzstatus

#PID
if [ -n "$PID" ] && [ -n "$TIMESTAMP" ]
then
	pid="PID: $MainPID,"
elif [ -n "$PID" ]
then
	pid="PID: $MainPID"
fi

#timestamp
if [ -n "$TIMESTAMP" ]
then
	timestamp=" running since $ActiveEnterTimestamp"
	#secs="echo $ActiveEnterTimestampMonotonic \ 1000000000 | bc"
	#timestamp=$( printf '%dd %02dh:%02dm:%02ds\n' $(($secs/86400)) $(($secs%86400/3600)) $(($secs%3600/60)) $(($secs%60)) )
	##Umrechnung Timestamp in Zeit
	#timestampnow="$(date -u +%s)"
	#timediff="$(echo "$timestampnow - $ActiveEnterTimestampMonotonic" | bc)"
	#newtimestamp="$(date -d @"$timediff")"
	#timestamp=" Timestamp: $newtimestamp"
fi

#perfdata
if [ -n "$PERFDATA" ]
then
	perfdata=" | alle perfdaten"
fi

additional="- $pid$timestamp$perfdata"

##############################################
# Auswertung des Status und aufbereitung für nrpe
if [ "$STATUS" = "is-active" ] && [ "$ActiveState" = "active" ]
then
	echo "OK - $UNIT ist running $additional"
	exit 0
elif [ "$STATUS" = "is-active" ] && [ "$ActiveState" = "inactive" ]
then
	echo "CRITICAL - $UNIT is not running $additional"
	exit 2
elif [ "$STATUS" = "is-active" ] 
then
	echo "UNKNOWN - is-active: Unbekannter Status: \"$ActiveState\""
	exit 3	
elif [ "$STATUS" = "is-enabled" ] && [ "$UnitFileState" = "enabled" ]
then
	echo "OK - $UNIT is enabled $additional"
	exit 0
elif [ "$STATUS" = "is-enabled" ] && [ "$UnitFileState" = "disabled" ]
then
	echo "CRITICAL - $UNIT is disabled $additional"
	exit 2
elif [ "$STATUS" = "is-enabled" ]
then
	echo "UNKNOWN - is-enabled: Unbekannter status: \"$UnitFileState\""
	exit 3	
else
	echo "UNKNOWN - Unbekannter Status"
	exit 3	

fi