#!/usr/bin/env bash

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

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

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

backup_date="$(date +%Y-%m-%d-%H%M)"
declare -a sync_dirs=()

DEFAULT_sync_dirs=""


# ----------
# 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 (){
   if $LOGGING || $terminal ; then
      echo ""
      if $terminal ; then
         echo -e "   [ \033[33m\033[1mWarn\033[m ]  $*"
      else
         echo "   [ Warn ]  $*"
      fi
      echo ""
   fi
}

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

ok (){
   if $LOGGING || $terminal ; then
      echo ""
      if $terminal ; then
         echo -e "   [ \033[32m\033[1mOk\033[m ]    $*"
      else
         echo "   [ Ok ]    $*"
      fi
      echo ""
   fi
}
echo_done() {
   if $terminal ; then
      echo -e "\033[75G[ \033[32mdone\033[m ]"
   fi
}
echo_ok() {
   if $terminal ; then
      echo -e "\033[75G[ \033[32mok\033[m ]"
   fi
}
echo_warn() {
   if $terminal ; then
      echo -e "\033[75G[ \033[33mwarn\033[m ]"
   fi
}
echo_failed(){
   if $terminal ; then
      echo -e "\033[75G[ \033[1;31mfailed\033[m ]"
   fi
}
echo_skipped() {
   if $terminal ; then
      echo -e "\033[75G[ \033[90m\033[1mskipped\033[m ]"
   fi
}
echo_wait(){
   if $terminal ; then
      echo -en "\033[75G[ \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
}


# ----------
# - 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
   terminal=false
fi


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

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

clear
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
# ----------

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

if ! (( ${#sync_dirs[@]} )) ; then
   sync_dirs=("${DEFAULT_sync_dirs[@]}")
fi



# ----------
# - Main part of script
# ----------

if $terminal ; then
   echo ""
   echo ""
   echo -e "   \033[1mGoing to sync from NAS systems ..\033[m"
   echo ""
fi


blank_line

sync_dirs="${sync_dirs##*( )}"
sync_dirs="${sync_dirs%%*( )}"

if [[ -z "${sync_dirs,,}" ]] ; then
    fatal "No Directories for syncing given!"
fi

for _val in $sync_dirs ; do

   blank_line

   IFS=':' read -a _val_arr <<< "${_val}"

   _src_dir="${_val_arr[0]}"

   if [[ -n "${_val_arr[1]}" ]] ; then
      _dst_dir="${_val_arr[1]}"
   else
      warn "No destination folder for \033[1m${_src_dir}\033[m was given."
      continue
   fi

   echononl "Create destination folder '${_dst_dir}'.."
   if [[ -d "${_dst_dir}" ]] ; then
      echo_skipped
   else
      mkdir -p "${_dst_dir}" > $log_file 2>&1
      if [[ $? -gt 0 ]]; then
         echo_failed
         error "$(cat $log_file)"

         echononl "Unmount folder '${_src_dir}' .."
         umount "${_src_dir}" > $log_file 2>&1
         if [[ $? -gt 0 ]]; then
            echo_failed
         else
            echo_done
         fi

         continue
      else
         echo_done
      fi
   fi

   echononl "Mount folder '${_src_dir}' from NAS system.."
   if $(mount | grep -q -E "${_src_dir} " > /dev/null 2>&1) ; then
      echo_skipped
   else
      mount "${_src_dir}" > $log_file 2>&1
      if [[ $? -gt 0 ]]; then
         echo_failed
         error "$(cat $log_file)"
         continue
      else
         echo_done
      fi
   fi

   echononl "Going to sync folder '${_src_dir}'.."
   echo_wait

   rsync -av \
         --exclude '.TemporaryItems' \
         --exclude '#recycle' \
         --exclude '.apdisk' \
         --exclude '*.DS_Store' \
         --delete \
         "${_src_dir}" "${_dst_dir}" > $log_file 2>&1

   if [[ $? -gt 0 ]]; then
      echo_failed
      error "$(cat $log_file)"
   else
      echo_done
   fi

   echononl "Unmount folder '${_src_dir}' .."
   umount "${_src_dir}" > $log_file 2>&1
   if [[ $? -gt 0 ]]; then
      echo_failed
   else
      echo_done
   fi

done

clean_up 0