#!/usr/bin/env bash

working_dir="$(dirname $(realpath $0))"
conf_file="${working_dir}/conf/cleanup_from_old_files.conf"

LOCK_DIR="/tmp/clean_trash.LOCK"


# -------------
# - 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 terminated\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[33m\033[1mskipped\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"
}


# -------------
# - Running in a terminal?
# -------------

if [[ -t 1 ]] ; then
   terminal=true
else
   terminal=false
fi


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

if [[ ! -f "$conf_file" ]]; then
	fatal " Configuration file '$(basename ${conf_file})' not found!"
else
   source "$conf_file"
fi

[[ -z "$(trim $dirs_to_cleanup)" ]] && fatal "No directory given!"
[[ -z "$days" ]] && days=31


# -------------
# - 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.."

	error "A previos instance of the script '$(basename $0)' seems already be running."

   exit 1

fi


traverse() {

   while IFS='' read -r -d '' name ; do

      [[ "$name" = ".." ]] && continue
      [[ "$name" = "." ]] && continue
      traverse "$name"

   done  < <(find "$1" -mindepth 1 -maxdepth 1 -type d -print0)

   find "$1" -mindepth 1 -maxdepth 1 -type f -mtime +${days} -exec rm -f "{}" \; > /dev/null 2>&1

}

for dir in $dirs_to_cleanup ; do
   info "Delete files from directory \033[1m${dir}\033[m older than \033[1m${days}\033[m days .."
   traverse "$dir"
done

# - Delete empty sub-directories
# -
if $terminal ; then
   echo -e "\033[32m\033[1m-----\033[m"
fi
for dir in $dirs_to_cleanup ; do
   info "Cleanup trash directory \033[1m${dir}\033[m from empty directories .."
   find $dir -depth -mindepth 1 -type d -empty -delete
done

clean_up 0