#!/bin/bash
#systemctl wrapper fo Koozali SME Server 

allargs=$@
opts=();
syscommand="";
sysunit=""
debug=$(/sbin/e-smith/config get debug || echo "false")
if [ "$debug" != "true" ]; then debug=false;fi

# short OPTIONS we must pay attention as they have more arguments
#-t, --type=
#-s, --signal=
#-p, --property=
#-o, --output=
#-n, --lines=
#-H, --host=
#-M, --machine=

#commands we should return directly to systemd
#list-units,list-sockets,list-timers,is-active,is-failed,status,show,cat,set-property,help,reset-failed,list-dependencies,
#list-unit-files,is-enabled,get-default,set-default
#list-machines
#list-jobs
#snapshot,delete
#show-environment,set-environment,unset-environment,import-environment
#daemon-reload,daemon-reexec
#is-system-running,default,rescue,emergency,halt,poweroff,reboot,kexec,switch-root,suspend,hibernate,hybrid-sleep

# This is a list of commands :
# -we want to handle ourself or 
# -we need to translate for systemd or
# -we do not want admin uses against the SME Server
#
# commands we handle: start,stop,reload,restart,try-restart,reload-or-restart,reload-or-try-restart,isolate,kill
#		      enable,disable,reenable,preset,preset-all,mask,unmask,link,add-wants,edit
# commands we deactivate/hide : mask,unmask,link,add-wants,edit set-default 
# not systemd but we might use them : adjust sigterm sighup sigusr1 sigusr2
filteredcommands=(start stop reload restart try-restart reload-or-restart reload-or-try-restart isolate kill enable disable reenable preset preset-all adjust sigterm sighup sigusr1 sigusr2 mask unmask link add-wants add-requires edit set-default );

# fucntion to check if this is a command we want
contains2 () {
    local seeking=$1
    local in=0
    for element in "${filteredcommands[@]}"; do
        if [[ $element == "$seeking" ]]; then
            in=1
            break
        fi
    done
    return $in
}

# if no args we return to systemcl
if [ $# -eq 0 ]; then 
	echo "we return to systemctl"
	/usr/bin/systemctl
	exit
fi

#parse args
while [ "$#" -gt 0 ]; do
        case "$1" in
	    -p|-t|-s|-o|-n|H|-M) temp=$1; shift ; opts+=("$temp $1");  ;;
            --*) opts+=("$1")  ;;
            -*) opts+=("$1")   ;;
            *)  if [[ "$syscommand" == "" ]]; then  syscommand="$1" ; else sysunit="$1"; fi   ;;
        esac
        shift
done

servicename=${sysunit%".service"}

#we return to systemd systemctl command unless this is one of the command we want to handle
if ( contains2 "$syscommand" ) ; then
	($debug) && echo "we return to /usr/bin/systemctl ${allargs[*]}"
	/usr/bin/systemctl ${allargs[*]}
 	exit
fi


# here we convert sig* to kill -s=SIG* or SME commant to ones systemd recognize
case "$syscommand" in 
	adjust|sighup|sigusr1|sigusr2)
		$syscommand="reload-or-restart";
		;;
	sigterm)
		$syscommand="restart";
		;;
esac


# catch here non unit signals, or ones we would like to do something different
#enable disable reenable preset preset-all
#mask unmask link add-wants edit
case "$syscommand" in
	preset-all)
		($debug) && echo "We do /etc/e-smith/events/actions/systemd-default"
		/etc/e-smith/events/actions/systemd-default
		exit
		;;
	preset)
		# TODO looking if we could use /etc/e-smith/events/actions/systemd-default none $servicename
		($debug) && echo "We do /etc/e-smith/events/actions/systemd-default"
		/etc/e-smith/events/actions/systemd-default
	        exit
		;;
	enable|disable|reenable)
                # looking if we could use 
		newstatus="enabled"
		todo="enable"
		if [ $syscommand == "disable" ]; then newstatus="disabled";todo="disable" ; fi
		/sbin/e-smith/config setprop $servicename status $newstatus
		#/etc/e-smith/events/actions/systemd-default none $servicename
		# TODO looking if we could do it only for the service would be great!
		($debug) && echo "We do /etc/e-smith/events/actions/systemd-default"
		($debug) && echo "/usr/bin/systemctl $todo $sysunit ${opts[*]}"	
		/etc/e-smith/events/actions/systemd-default
		/usr/bin/systemctl $todo $sysunit ${opts[*]}
                exit
		;;
	set-default |isolate)
		echo "We only $syscommand against sme-server.target"
		($debug) && echo "/etc/e-smith/events/actions/systemd-default"
		($debug) && echo "/etc/e-smith/events/actions/systemd-isolate"
		/etc/e-smith/events/actions/systemd-default
		/etc/e-smith/events/actions/systemd-isolate
		;;
	link|mask|unmask|add-wants|add-requires|edit)
		echo "Please, do not use $syscommand for Koozali SME Server"
	        exit
		;;
esac


#check the unit exist or fails : we do not care systemctl will do this...

# here we check if in db and if enabled or disabled
# if not or not service = return to systemctl directly
stype=$(/sbin/e-smith/db configuration gettype $servicename || echo "none")
sstatus=$(/sbin/e-smith/db configuration getprop $servicename status || echo "disabled")
if [ $stype == "none" ] ; then
	# not defined in db, we redirect
	echo "Information: $sysunit is not defined in configuration DB."
	($debug) && echo "/usr/bin/systemctl ${allargs[*]}"
	/usr/bin/systemctl ${allargs[*]}
	exit
elif [ $stype != "service" ] ; then
	echo "Information: $sysunit is not defined as a service in configuration DB but $type"
	($debug) && echo "/usr/bin/systemctl ${allargs[*]}"
	/usr/bin/systemctl ${allargs[*]}
	exit
elif [ $sstatus == "disabled" ]; then
	echo "Information: $sysunit is $sstatus in configuration DB."	
	# we might want to simply stop
	#/usr/bin/systemctl stop $sysunit 
	# but we will do what we were asked for
	($debug) && echo "/usr/bin/systemctl ${allargs[*]}"
	/usr/bin/systemctl ${allargs[*]} 
	exit
elif [ $sstatus == "enabled" ]; then
	#echo "$sstatus" 
	# starting in case
	#systemctl is-active -q $sysunit will return zero if active; non zero if not
	#/usr/bin/systemctl is-active -q $sysunit || /usr/bin/systemctl start $sysunit
	# now executing the command
	($debug) && echo "/usr/bin/systemctl $syscommand $sysunit ${opts[*]}"
	/usr/bin/systemctl $syscommand $sysunit ${opts[*]}
	exit
fi 





echo "if you see that, we missed something, report the command to https://bugs.koozali.org"
echo "options : " ${opts[*]};
echo "command : " $syscommand;
echo "unit :" $sysunit;
echo $@