#!/usr/bin/env bash
  
script_name="$(basename $(realpath $0))"
working_dir="$(dirname $(realpath $0))"

#conf_file="${working_dir}/conf/${script_name%%.*}.conf"
conf_file="${working_dir}/conf/jitsi.conf"

LOCK_DIR="/tmp/$(basename $0).$$.LOCK"
log_file="${LOCK_DIR}/${script_name%%.*}.log"


# ----------
# Base Function(s)
# ----------

clean_up() {

   # Perform program exit housekeeping
   rm -rf "$LOCK_DIR"
   blank_line
   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 ] $*"
   else
      echo -e "   [ Fatal ] $*"
   fi
   echo ""
   if $terminal ; then
      echo -e "             \033[1mScript terminated\033[m.."
   else
      echo -e "             Script terminated.."
   fi
   echo ""
   rm -rf $LOCK_DIR
   exit 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 "   [ Error ] $*"
   fi
   echo ""
}

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


echo_ok() {
   if $terminal ; then
      echo -e "\033[85G[ \033[32mok\033[m ]"
   fi
}
echo_failed(){
   if $terminal ; then
      echo -e "\033[85G[ \033[1;31mfailed\033[m ]"
   fi
}
echo_skipped() {
   if $terminal ; then
      echo -e "\033[85G[ \033[33m\033[1mskipped\033[m ]"
   fi
}
echo_wait(){
   if $terminal ; then
      echo -en "\033[85G[ \033[5m\033[1m..\033[m ]"
   fi
}

trim() {
    local var="$*"
    var="${var#"${var%%[![:space:]]*}"}"   # remove leading whitespace characters
    var="${var%"${var##*[![:space:]]}"}"   # remove trailing whitespace characters
    echo -n "$var"
}

blank_line() {
   if $terminal ; then
      echo ""
   fi
}

detect_os () {

   if $(which lsb_release > /dev/null 2>&1) ; then

      DIST="$(lsb_release -i | awk '{print tolower($3)}')"
      DIST_VERSION="$(lsb_release -r | awk '{print tolower($2)}')"
      DIST_CODENAME="$(lsb_release -c | awk '{print tolower($2)}')"

      if [[ "$DIST" = "debian" ]]; then
         if $(echo "$DIST_VERSION" | grep -q '\.') ; then
            DIST_VERSION=$(echo "$DIST_VERSION" | cut --delimiter='.' -f1)
         fi
      fi

   elif [[ -e "/etc/os-release" ]]; then

      . /etc/os-release

      DIST=$ID
      DIST_VERSION=${VERSION_ID}

   fi

   # remove whitespace from DIST and DIST_VERSION
   DIST="${DIST// /}"
   DIST_VERSION="${DIST_VERSION// /}"

}



# ----------
# - Jobhandling
# ----------

# - Run 'clean_up' for signals SIGHUP SIGINT SIGTERM
# -
trap clean_up SIGHUP SIGINT SIGTERM

# - Create lock directory '$LOCK_DIR"
#
mkdir "$LOCK_DIR"


# ----------
# - Some checks ..
# ----------

# - Running in a terminal?
# -
if [[ -t 1 ]] ; then
   terminal=true
else
   fatal "Script must run in a terminal."
fi


# ==========
# - Begin Main Script
# ==========

# ----------
# - Headline
# ----------

if $terminal ; then
   echo ""
   echo -e "\033[1m----------\033[m"
   echo -e "\033[32m\033[1mRunning script \033[m\033[1m$script_name\033[32m .. \033[m"
   echo -e "\033[1m----------\033[m"
fi


# ----------
#  Read Configurations from $conf_file
# ----------


# - Give your default values here
# -
DEFAULT_FQHN_HOSTNAME="$(hostname -f)"
DEFAULT_JITSI_REPOSITORY_VERSION="stable"

if [[ -f "$conf_file" ]]; then
   source "$conf_file"
else
   warn "No configuration file '$conf_file' present.\n
             Loading default values.."
fi

[[ -n "$FQHN_HOSTNAME" ]] && DEFAULT_FQHN_HOSTNAME="$FQHN_HOSTNAME"
[[ -n "$JITSI_REPOSITORY_VERSION" ]] && DEFAULT_JITSI_REPOSITORY_VERSION="$JITSI_REPOSITORY_VERSION"
if [[ "$DEFAULT_JITSI_REPOSITORY_VERSION" != "stable" ]] \
      && [[ "$DEFAULT_JITSI_REPOSITORY_VERSION" != "unstable" ]]; then
   DEFAULT_JITSI_REPOSITORY_VERSION=""
fi


blank_line
echononl "Detect distribution/release of running OS.."
detect_os > "$log_file" 2>&1
if [[ $? -ne 0 ]]; then
	echo_failed
	error "$(cat "$log_file")"
else
	echo_ok
fi


FQHN_HOSTNAME=
echo ""
echo -e "\033[32m--\033[m"
echo ""
echo "Insert full qualified hostname for Jitsi-Meet Service"
echo ""
if [[ -n "$DEFAULT_FQHN_HOSTNAME" ]]; then
   while [[ "X${FQHN_HOSTNAME}" = "X" ]]; do
      echononl "Full qualified hostname [${DEFAULT_FQHN_HOSTNAME}]: "
      read FQHN_HOSTNAME
      if [[ "X${FQHN_HOSTNAME}" = "X" ]]; then
         FQHN_HOSTNAME=$DEFAULT_FQHN_HOSTNAME
      fi
      if [[ ! $FQHN_HOSTNAME =~ \. ]]; then
         echo -e "\n\tGiven Host \033[33m\033[1m$FQHN_HOSTNAME\033[m seems not to be a full qualified hostname.\n"
         FQHN_HOSTNAME=""
      fi
   done
else
   while [[ "X${FQHN_HOSTNAME}" = "X" ]]; do
      echononl "Full qualified hostname: "
      read FQHN_HOSTNAME
      if [[ "X${FQHN_HOSTNAME}" = "X" ]]; then
         echo -e "\n\t\033[33m\033[1mFull qualified hostname is reqired\033[m\n"
      fi
      if [[ ! $FQHN_HOSTNAME =~ \. ]]; then
         echo -e "\n\tGiven Host \033[33m\033[1m$FQHN_HOSTNAME\033[m seems not to be a full qualified hostname.\n"
         FQHN_HOSTNAME=""
      fi
   done
fi
HOSTNAME="${FQHN_HOSTNAME%%.*}"

JITSI_REPOSITORY_VERSION=""
echo ""
echo -e "\033[32m--\033[m"
echo ""
echo "Which Jitsi Repository should be installed?"
echo ""
if [[ "$DEFAULT_JITSI_REPOSITORY_VERSION" = 'unstable' ]]; then
   echo "[1] stable"
   echo -e "[2] \033[1munstable\033[m"
elif [[ "$DEFAULT_JITSI_REPOSITORY_VERSION" = 'stable' ]]; then
   echo -e "[1] \033[1mstable\033[m"
   echo "[2] unstable"
else
   echo "[1] stable"
   echo "[2] unstable"
fi
echo ""
echo "Type a number or press <RETURN> to choose highlighted value if available"
echo ""
echononl "Eingabe: "

while [[ "$JITSI_REPOSITORY_VERSION" != "stable" ]] \
         && [[ "$JITSI_REPOSITORY_VERSION" != "unstable" ]]; do
   read OPTION
   case $OPTION in
      1) JITSI_REPOSITORY_VERSION="stable"
         ;;
      2) JITSI_REPOSITORY_VERSION="unstable"
         ;;
   '') JITSI_REPOSITORY_VERSION="$DEFAULT_JITSI_REPOSITORY_VERSION"
         if [[ -z "$JITSI_REPOSITORY_VERSION" ]] ; then
            echo ""
            echo -e "\tFalsche Eingabe ! [ 1 = stable ; 2 = unstable ]"
            echo ""
            echononl "Eingabe:"
         fi
         ;;
      *) echo ""  
         echo -e "\tFalsche Eingabe ! [ 1 = stable ; 2 = unstable ]"
         echo ""
         echononl "Eingabe:"
         ;;
   esac
done


echo ""
echo ""
echo -e "\t\033[32mStart pre-install script for Jitsi-Meet Service with the following parameters\033[m"
echo ""
echo -e "\tFull qualified Hostname..: $FQHN_HOSTNAME"
echo -e "\tHostname.................: $HOSTNAME"
echo ""
echo -e "\tJitsi Repository Version.: $JITSI_REPOSITORY_VERSION"
echo ""
echononl "einverstanden (yes/no): "
read OK
OK=${OK,,}
while [ "X$OK" != "Xyes" -a "X$OK" != "Xno" ]; do
   echononl "Wrong entry! [yes/no]: "
   read OK
   OK=${OK,,}
done
[ $OK = "yes" ] || fatal Repeat with other settings..

echo ""
echo ""


echo
echo -e "\033[37m\033[1mSome checks....\033[m"
echo

_failed=false
echononl "Check if Nginx Webservice is installed.."
if $(dpkg -s nginx-extras > "$log_file" 2>&1) ; then
   nginx_installed=true
elif $(dpkg -s nginx-full > "$log_file" 2>&1) ; then
   nginx_installed=true
else
   nginx_installed=false
fi
if $nginx_installed ; then
   echo -e "\033[85G[ \033[32mYES\033[m ]"
else
   echo -e "\033[85G[ \033[1;31mNOT installed\033[m ]"
fi


_failed=false
echononl "Check if certificate for '$FQHN_HOSTNAME' is present.."
if [[ -d "/var/lib/dehydrated/certs/${FQHN_HOSTNAME}" ]] ; then
   if [[ -h "/var/lib/dehydrated/certs/${FQHN_HOSTNAME}/fullchain.pem" ]]; then
      cert_present=true
   else
      cert_present=false
   fi
else
   cert_present=false
fi
if $cert_present ; then
   echo -e "\033[85G[ \033[32mYES\033[m ]"
else
   echo -e "\033[85G[ \033[1;31mNOT present\033[m ]"
fi

if ! $cert_present || ! $nginx_installed ; then
   warn "We recommend you to have Nginx installed and also created the Lets Encrypt
               Certificate for jitsi host ${FQHN_HOSTNAME}"

   echononl "\033[1mcontinue anyway\033[m [yes/no]: "
   read OK
   OK="$(echo "$OK" | tr '[:upper:]' '[:lower:]')"
   while [[ "$OK" != "yes" ]] && [[  "$OK" != "no" ]] ; do
      echononl "Wrong entry! - repeat [yes/nno]: "
      read OK
   done
   [[ $OK = "yes" ]] || fatal "Abbruch durch User"
fi


echo
echo -e "\033[37m\033[1mUpdate file '/etc/systemd/system.conf'....\033[m"
echo

echononl "Set Parameter 'DefaultLimitNOFILE'.."
if ! $(grep -q -E "^\s*DefaultLimitNOFILE=" /etc/systemd/system.conf 2> /dev/null); then
   perl -i -n -p -e "s/^(\s*#DefaultLimitNOFILE=.*)/\1\nDefaultLimitNOFILE=1048576/" \
      /etc/systemd/system.conf  > "$log_file" 2>&1
   if [[ $? -ne 0 ]]; then
      echo_failed
      error "$(cat "$log_file")"
   else
      echo_ok
   fi
elif ! $(grep -q -E "^\s*DefaultLimitNOFILE=1048576" /etc/systemd/system.conf 2> /dev/null); then
   perl -i -n -p -e "s/^\s*DefaultLimitNOFILE=.*/DefaultLimitNOFILE=1048576/" \
      /etc/systemd/system.conf > "$log_file" 2>&1
   if [[ $? -ne 0 ]]; then
      echo_failed
      error "$(cat "$log_file")"
   else
      echo_ok
   fi
else
   echo_skipped
fi

echononl "Set Parameter 'DefaultLimitNPROC'.."
if ! $(grep -q -E "^\s*DefaultLimitNPROC=" /etc/systemd/system.conf 2> /dev/null); then
   perl -i -n -p -e "s/^(\s*#DefaultLimitNPROC=.*)/\1\nDefaultLimitNPROC=1048576/" \
      /etc/systemd/system.conf > "$log_file" 2>&1
   if [[ $? -ne 0 ]]; then
      echo_failed
      error "$(cat "$log_file")"
   else
      echo_ok
   fi
elif ! $(grep -q -E "^\s*DefaultLimitNPROC=1048576" /etc/systemd/system.conf 2> /dev/null); then
   perl -i -n -p -e "s/^\s*DefaultLimitNPROC=.*/DefaultLimitNPROC=1048576/" \
      /etc/systemd/system.conf > "$log_file" 2>&1
   if [[ $? -ne 0 ]]; then
      echo_failed
      error "$(cat "$log_file")"
   else
      echo_ok
   fi
else
   echo_skipped
fi

echononl "Set Parameter 'DefaultTasksMax'.."
if ! $(grep -q -E "^\s*DefaultTasksMax=" /etc/systemd/system.conf 2> /dev/null); then
   perl -i -n -p -e "s/^(\s*#DefaultTasksMax=.*)/\1\nDefaultTasksMax=1048576/" \
      /etc/systemd/system.conf > "$log_file" 2>&1
   if [[ $? -ne 0 ]]; then
      echo_failed
      error "$(cat "$log_file")"
   else
      echo_ok
   fi
elif ! $(grep -q -E "^\s*DefaultTasksMax=1048576" /etc/systemd/system.conf 2> /dev/null); then
   perl -i -n -p -e "s/^\s*DefaultTasksMax=.*/DefaultTasksMax=1048576/" \
      /etc/systemd/system.conf > "$log_file" 2>&1
   if [[ $? -ne 0 ]]; then
      echo_failed
      error "$(cat "$log_file")"
   else
      echo_ok
   fi
else
   echo_skipped
fi

echononl "Set Parameter 'DefaultLimitRTPRIO'.."
if ! $(grep -q -E "^\s*DefaultLimitRTPRIO=" /etc/systemd/system.conf 2> /dev/null); then
   perl -i -n -p -e "s/^(\s*#DefaultLimitRTPRIO=.*)/\1\nDefaultLimitRTPRIO=infinity/" \
      /etc/systemd/system.conf > "$log_file" 2>&1
   if [[ $? -ne 0 ]]; then
      echo_failed
      error "$(cat "$log_file")"
   else
      echo_ok
   fi
elif ! $(grep -q -E "^\s*DefaultLimitRTPRIO=infinity" /etc/systemd/system.conf 2> /dev/null); then
   perl -i -n -p -e "s/^\s*DefaultLimitRTPRIO=.*/DefaultLimitRTPRIO=infinity/" \
      /etc/systemd/system.conf > "$log_file" 2>&1
   if [[ $? -ne 0 ]]; then
      echo_failed
      error "$(cat "$log_file")"
   else
      echo_ok
   fi
else
   echo_skipped
fi

echononl "Set Parameter 'DefaultLimitRTTIME'.."
if ! $(grep -q -E "^\s*DefaultLimitRTTIME=" /etc/systemd/system.conf 2> /dev/null); then
   perl -i -n -p -e "s/^(\s*#DefaultLimitRTTIME=.*)/\1\nDefaultLimitRTTIME=infinity/" \
      /etc/systemd/system.conf > "$log_file" 2>&1
   if [[ $? -ne 0 ]]; then
      echo_failed
      error "$(cat "$log_file")"
   else
      echo_ok
   fi
elif ! $(grep -q -E "^\s*DefaultLimitRTTIME=infinity" /etc/systemd/system.conf 2> /dev/null); then
   perl -i -n -p -e "s/^\s*DefaultLimitRTTIME=.*/DefaultLimitRTTIME=infinity/" \
      /etc/systemd/system.conf > "$log_file" 2>&1
   if [[ $? -ne 0 ]]; then
      echo_failed
      error "$(cat "$log_file")"
   else
      echo_ok
   fi
else
   echo_skipped
fi

_failed=false
echononl "Set Parameter 'DefaultLimitCORE'.."
if ! $(grep -q -E "^\s*DefaultLimitCORE=" /etc/systemd/system.conf 2> /dev/null); then
   perl -i -n -p -e "s/^(\s*#DefaultLimitCORE=.*)/\1\nDefaultLimitCORE=infinity/" \
      /etc/systemd/system.conf > "$log_file" 2>&1
   if [[ $? -ne 0 ]]; then
      echo_failed
      error "$(cat "$log_file")"
   else
      echo_ok
   fi
elif ! $(grep -q -E "^\s*DefaultLimitCORE=infinity" /etc/systemd/system.conf 2> /dev/null); then
   perl -i -n -p -e "s/^\s*DefaultLimitCORE=.*/DefaultLimitCORE=infinity/" \
      /etc/systemd/system.conf > "$log_file" 2>&1
   if [[ $? -ne 0 ]]; then
      echo_failed
      error "$(cat "$log_file")"
   else
      echo_ok
   fi
else
   echo_skipped
fi


echononl "Reload Systemd .."
systemctl daemon-reload > "$log_file" 2>&1
if [[ $? -ne 0 ]]; then
   echo_failed
   error "$(cat "$log_file")"
else
   echo_ok
fi


echo
echo -e "\033[37m\033[1mSome Certifikation/Key stuff..\033[m"
echo

cert_copied=false
echononl "Copy Snakeoil Cert to file '/etc/ssl/fullchain.pem'.."
if [[ ! -f "/etc/ssl/fullchain.pem" ]] && [[ ! -h "/etc/ssl/fullchain.pem" ]]; then
   cp /etc/ssl/certs/ssl-cert-snakeoil.pem /etc/ssl/fullchain.pem > "$log_file" 2>&1
   if [[ $? -ne 0 ]]; then
      echo_failed
      error "$(cat "$log_file")"
   else
      echo_ok
      cert_copied=true
   fi
else
   echo_skipped
fi

perm_cert="644"
echononl "Set Permission $perm_cert on file '/etc/ssl/fullchain.pem'.."
if $cert_copied ; then
   chmod 644 /etc/ssl/fullchain.pem > "$log_file" 2>&1
   if [[ $? -ne 0 ]]; then
      echo_failed
      error "$(cat "$log_file")"
   else
      echo_ok
   fi
else
   echo_skipped
fi

if [[ ! -h "/etc/ssl/${FQHN_HOSTNAME}.crt" ]]; then
   if [[ -f "/etc/ssl/${FQHN_HOSTNAME}.crt" ]] ; then
      echononl "Remove file '/etc/ssl/${FQHN_HOSTNAME}.crt'.."
      rm "/etc/ssl/${FQHN_HOSTNAME}.crt" > "$log_file" 2>&1
      if [[ $? -ne 0 ]]; then
         echo_failed
         error "$(cat "$log_file")"
      else
         echo_ok
      fi
   fi
   echononl "Set Symlink '/etc/ssl/${FQHN_HOSTNAME}.crt --> fullchain.pem'.."
   ln -s fullchain.pem /etc/ssl/${FQHN_HOSTNAME}.crt > "$log_file" 2>&1
   if [[ $? -ne 0 ]]; then
      echo_failed
      error "$(cat "$log_file")"
   else
      echo_ok
   fi
else
   echononl "Set Symlink '/etc/ssl/${FQHN_HOSTNAME}.crt --> fullchain.pem'.."
   echo_skipped
fi

blank_line

key_copied=false
echononl "Copy Snakeoil Key to file '/etc/ssl/privkey.pem'.."
if [[ ! -f "/etc/ssl/privkey.pem" ]] && [[ ! -h "/etc/ssl/privkey.pem" ]]; then
   cp  /etc/ssl/private/ssl-cert-snakeoil.key /etc/ssl/privkey.pem > "$log_file" 2>&1
   if [[ $? -ne 0 ]]; then
      echo_failed
      error "$(cat "$log_file")"
   else
      echo_ok
      key_copied=true
   fi
else
   echo_skipped
fi

perm_key="644"
echononl "Set Permission $perm_key on file '/etc/ssl/privkey.pem'.."
if $key_copied ; then
   chmod 644 /etc/ssl/privkey.pem > "$log_file" 2>&1
   if [[ $? -ne 0 ]]; then
      echo_failed
      error "$(cat "$log_file")"
   else
      echo_ok
   fi
else
   echo_skipped
fi

if [[ ! -h "/etc/ssl/${FQHN_HOSTNAME}.key" ]]; then
   if [[ -f "/etc/ssl/${FQHN_HOSTNAME}.key" ]] ; then
      echononl "Remove file '/etc/ssl/${FQHN_HOSTNAME}.key'.."
      rm "/etc/ssl/${FQHN_HOSTNAME}.key" > "$log_file" 2>&1
      if [[ $? -ne 0 ]]; then
         echo_failed
         error "$(cat "$log_file")"
      else
         echo_ok
      fi
   fi
   echononl "Set Symlink '/etc/ssl/${FQHN_HOSTNAME}.key --> privkey.pem'.."
   ln -s privkey.pem /etc/ssl/${FQHN_HOSTNAME}.key > "$log_file" 2>&1
   if [[ $? -ne 0 ]]; then
      echo_failed
      error "$(cat "$log_file")"
   else
      echo_ok
   fi
else
   echononl "Set Symlink '/etc/ssl/${FQHN_HOSTNAME}.key --> privkey.pem'.."
   echo_skipped
fi



echo
echo -e "\033[37m\033[1mSome naming stuff..\033[m"
echo

echononl "Change /etc/hostname - set entry to '$FQHN_HOSTNAME'.."
if [[ "$(head -1 /etc/hostname)" != "$FQHN_HOSTNAME" ]]; then
   cat <<EOF > /etc/hostname
$FQHN_HOSTNAME
EOF
   if [[ $? -ne 0 ]]; then
      echo_failed
      error "$(cat "$log_file")"
   else
      echo_ok
   fi
else
   echo_skipped
fi

blank_line

echo -e "   Take care '/etc/hosts' contains line '127.0.1.1 ${FQHN_HOSTNAME} $HOSTNAME'.."
echononl "  \033[1m127.0.1.1 ${FQHN_HOSTNAME} $HOSTNAME\033[m .."
if ! $(grep -q -E "^\s*127.0.1.1 ${FQHN_HOSTNAME} $HOSTNAME" /etc/hosts 2> "$log_file") ; then
   if $(grep -q -E "^\s*127.0.1.1" /etc/hosts 2> "$log_file") ; then
      perl -i -n -p -e "s/(^\s*127.0.1.1.*)/#\1\n127.0.1.1 ${FQHN_HOSTNAME} $HOSTNAME/" \
         /etc/hosts > "$log_file" 2>&1
      if [[ $? -ne 0 ]]; then
         echo_failed
         error "$(cat "$log_file")"
      else
         echo_ok
      fi
   elif $(grep -q -E "^\s*127.0.0.1" /etc/hosts 2> "$log_file") ; then
      perl -i -n -p -e "s/(^\s*127.0.0.1.*)/\1\n127.0.1.1 ${FQHN_HOSTNAME} $HOSTNAME/" \
         /etc/hosts > "$log_file" 2>&1
      if [[ $? -ne 0 ]]; then
         echo_failed
         error "$(cat "$log_file")"
      else
         echo_ok
      fi
   else
      cat <<EOF >> /etc/hosts 2> "$log_file"
127.0.1.1 ${FQHN_HOSTNAME} $HOSTNAME
EOF
      if [[ $? -ne 0 ]]; then
         echo_failed
         error "$(cat "$log_file")"
      else
         echo_ok
      fi
   fi
else
   echo_skipped
fi



echo
echo -e "\033[37m\033[1mRepository stuff..\033[m"
echo


echononl "Add the '$JITSI_REPOSITORY_VERSION' Jitsi package repository.."
echo "deb https://download.jitsi.org ${JITSI_REPOSITORY_VERSION}/" > /etc/apt/sources.list.d/jitsi-${JITSI_REPOSITORY_VERSION}.list
if [[ $? -ne 0 ]]; then
   echo_failed
   error "$(cat "$log_file")"
else
   echo_ok
fi

if [[ "$JITSI_REPOSITORY_VERSION" = "stable" ]]; then
   if [[ -f "/etc/apt/sources.list.d/jitsi-unstable.list" ]]; then
      echononl "Remove Repository List for 'unstable' jitsi packages.."
      rm "/etc/apt/sources.list.d/jitsi-unstable.list" > "$log_file" 2>&1
      if [[ $? -ne 0 ]]; then
         echo_failed
         error "$(cat "$log_file")"
      else
         echo_ok
      fi
   fi
else
   if [[ -f "/etc/apt/sources.list.d/jitsi-stable.list" ]]; then
      echononl "Remove Repository List for 'stable' jitsi packages.."
      rm "/etc/apt/sources.list.d/jitsi-stable.list" > "$log_file" 2>&1
      if [[ $? -ne 0 ]]; then
         echo_failed
         error "$(cat "$log_file")"
      else
         echo_ok
      fi
   fi
fi

echononl "Add the Jitsi Maintainer gpg key.."
wget -qO -  https://download.jitsi.org/jitsi-key.gpg.key 2> "$log_file" | sudo apt-key add - > "$log_file" 2>&1
if [[ $? -ne 0 ]]; then
   echo_failed
   error "$(cat "$log_file")"
else
   echo_ok
fi

echononl "Update Repository.."
apt-get update > "$log_file" 2>&1
if [[ $? -ne 0 ]]; then
   echo_failed
   error "$(cat "$log_file")"
else
   echo_ok
fi

# Ensure support is available for apt repositories served via HTTPS
#
echononl "Install 'apt-transport-https'.."
if $(dpkg -s apt-transport-https > "$log_file" 2>&1) ; then
   echo_skipped
else
   apt-get install -y apt-transport-https > "$log_file" 2>&1
   if [[ $? -ne 0 ]]; then
      echo_failed
      error "$(cat "$log_file")"
   else
      echo_ok
   fi
fi

info "To ensure, your system is fully prepared for installing Jitsi Meet, it is 
             recommend to \033[1mreboot the system before installing Jitsi Meet\033[m."

clean_up 0