#!/usr/bin/env bash

working_dir="$(dirname $(realpath $0))"


# -------------
# - Some Variables
# -------------

LOCK_DIR="/tmp/$(basename $0).LOCK"

service_name="nginx"
alert_email_arr="ckubu@oopen.de"
sender_address="check_${service_name}@$(hostname -f)"

check_string_ps="nginx: master"

restart_needed=false

# -------------
# - Job is already running?
# -------------

# - If job already runs, stop execution..
# -
if mkdir "$LOCK_DIR" 2> /dev/null ; then

   ## - Remove lockdir when the script finishes, or when it receives a signal
   trap clean_up SIGHUP SIGINT SIGTERM

else

   datum="$(date +"%d.%m.%Y %H:%M")"

   msg="[ Error ]: A previos instance of \"`basename $0`\" seems already be running.\n\n           Exiting now.."

   echo ""
   echo "[ Error ]: A previos instance of that script \"`basename $0`\" seems already be running."
   echo ""
   echo -e "           Exiting now.."
   echo ""

   for _email in ${alert_email_arr[@]} ; do
      echo -e "To:${_email}\n${content_type}\nSubject:Error cronjob `basename $0` -- $datum\n${msg}\n" \
         | sendmail -F "Error `hostname -f`" -f $sender_address $_email
   done

   exit 1

fi


# -------------
# - Some functions
# -------------

clean_up() {

   # Perform program exit housekeeping
   rm -rf "$LOCK_DIR"
   exit $1
}

echononl(){
   if $terminal ; then
      echo X\\c > /tmp/shprompt$$
      if [ `wc -c /tmp/shprompt$$ | awk '{print $1}'` -eq 1 ]; then
         echo -e -n "$*\\c" 1>&2
      else
         echo -e -n "$*" 1>&2
      fi
      rm /tmp/shprompt$$
   fi
}

fatal(){
   echo ""
   if $terminal ; then
      echo -e "   [ \033[31m\033[1mFatal\033[m ]: $*"
      echo ""
      echo -e "   \033[31m\033[1mScript was interupted\033[m!"
   else
      echo "   [ Fatal ]: $*"
      echo ""
      echo "              Script was terminated...."
   fi
   echo ""
   clean_up 1
}

error (){
   echo ""
   if $terminal ; then
      echo -e "   [ \033[31m\033[1mError\033[m ]: $*"
   else
      echo "[ Error ]: $*"
   fi
   echo ""
}

warn (){
   echo ""
   if $terminal ; then
      echo -e "   [ \033[33m\033[1mWarning\033[m ]: $*"
   else
      echo "[ Warning ]: $*"
   fi
   echo ""
}

info (){
   if $terminal ; then
   	echo ""
      echo -e "   [ \033[32m\033[1mInfo\033[m ]: $*"
   	echo ""
   fi
}

echo_done() {
   if $terminal ; then
      echo -e "\033[75G[ \033[32mdone\033[m ]"
   fi
}
echo_failed(){
   if $terminal && $LOGGING ; then
      echo -e "\033[75G[ \033[1;31mfailed\033[m ]"
   fi
}
echo_skipped() {
   if $terminal && $LOGGING ; then
      echo -e "\033[75G[ \033[90m\033[1mskipped\033[m ]"
   fi
}


# -------------
# - Check some prerequisites
# -------------

# - Running in a terminal?
# -
if [[ -t 1 ]] ; then
   terminal=true
else
   terminal=false
fi

# - Systemd supported ?
# -
systemd=$(which systemd)
systemctl=$(which systemctl)

systemd_supported=false
if [[ -n "$systemd" ]] && [[ -n "$systemctl" ]] ; then
   systemd_supported=true
else
   fatal "Support of systemd is requirred for this script"
fi


# -------------
# - Main Part of Script
# -------------

if $terminal ; then
	echo -e "\n   Check if networking service is enabled.."
	echo -e "   ========================================"
fi

if ! $(systemctl is-enabled networking > /dev/null 2>&1) ; then

   error "Networking service is NOT enabled"

   echononl "   Enable networking service.."
   systemctl enable networking > /dev/null 2>&1

   if [[ $? -eq 0 ]] ; then
      echo_done
   else
      echo_failed
   fi

else

   info "Networking service is enabled"

fi

if $terminal ; then
	echo -e "\n   Check if networking service is active.."
	echo -e "   ======================================="
fi

if ! $(systemctl is-active networking > /dev/null 2>&1) ; then

   error "Networking service is NOT active."

   echononl "   (Re)start networking service.."
   systemctl restart networking > /dev/null 2>&1

   if [[ $? -eq 0 ]] ; then
      echo_done
   else
      echo_failed
   fi

else

   info "Networking service is active"

fi

clean_up 0