#!/bin/bash

# time stamp
printf "\nMultiple backups started at:\n  "
date

# # log the shell used
# echo "Shell used: $0"

# base setup
SCRIPT_PATH=$(realpath $0)
SCRIPT_DIR=$(dirname $SCRIPT_PATH)

# debugging
echo "debugging SCRIPT_PATH=$SCRIPT_PATH"
echo "debugging SCRIPT_DIR=$SCRIPT_DIR"

# save old CONFIGURATION for later reset
export SAVE_CONFIGURATION=$CONFIGURATION
# debugging
printf "debugging SAVE_CONFIGURATION=%s\n" $SAVE_CONFIGURATION

# export all variables in "../.env"
set -a            
source ${SCRIPT_DIR}/../.env
set +a

# check BACKUP_CONFIGURATIONS
if [[ -z ${BACKUP_CONFIGURATIONS} ]]; then
  #%! echo "You must provide a BACKUP_CONFIGURATIONS via environment variable"
  printf "!!! You must provide a BACKUP_CONFIGURATIONS via environment variable !!!\n"
  exit 1
else
  # debugging
  printf "debugging BACKUP_CONFIGURATIONS=%s\n" $BACKUP_CONFIGURATIONS

  # convert configurations to array
  IFS=' ' read -a CONFIGURATIONS_ARRAY <<< "$BACKUP_CONFIGURATIONS"

  # display the clusters
  printf "Backup the clusters:\n"
  for i in "${CONFIGURATIONS_ARRAY[@]}"
  do
    echo "  $i"
  done
fi

# check BACKUP_SAVED_BACKUPS_NUMBER
if [[ -z ${BACKUP_SAVED_BACKUPS_NUMBER} ]]; then
  #%! echo "You must provide a BACKUP_SAVED_BACKUPS_NUMBER via environment variable"
  printf "!!! You must provide a BACKUP_SAVED_BACKUPS_NUMBER via environment variable !!!\n"
  exit 1
else
  # deleting backups?
  if (( BACKUP_SAVED_BACKUPS_NUMBER >= 1 )); then
    printf "Keep the last %d backups for all networks.\n" $BACKUP_SAVED_BACKUPS_NUMBER
  else
    echo "!!! ATTENTION: No backups are deleted !!!"
  fi
fi

echo "Cancel by ^C. You have 15 seconds"
# wait for the admin to react
sleep 15

printf "\n"

for i in "${CONFIGURATIONS_ARRAY[@]}"
do
  export CONFIGURATION=$i
  # individual cluster backup
  ${SCRIPT_DIR}/cluster.backup.sh

  # deleting backups?
  if (( BACKUP_SAVED_BACKUPS_NUMBER >= 1 )); then
    # delete all oldest backups, but leave the last BACKUP_SAVED_BACKUPS_NUMBER

    keep=$BACKUP_SAVED_BACKUPS_NUMBER
    path="$SCRIPT_DIR/../configurations/$CONFIGURATION/backup/"

    cd $path

    printf "In\n  '$path'\n  remove:\n"
    while [ `ls -1  |  wc -l` -gt $keep ]; do
      # TODO: because 'ls' is not always relyable maybe replace 'ls' by 'find . -type d -maxdepth 1'? description: https://unix.stackexchange.com/questions/28939/how-to-delete-the-oldest-directory-in-a-given-directory
      #         I tested this, but 'find' this is crutial, because of shell compatibilities
      oldest=`ls -c1  |  sort -n  |  head -1`
      printf "  %s\n" $oldest
      rm -rf $oldest
    done

    printf "Keep the last %d backups:\n" $BACKUP_SAVED_BACKUPS_NUMBER
    ls -c1  |  sort -n  |  awk '{print "  " $0}'

    cd $SCRIPT_DIR
  else
    echo "!!! ATTENTION: No backups are deleted !!!"
  fi

  printf "\n"
done

# reset CONFIGURATION to old
# TODO: clearily if this is the same as: $ export CONFIGURATION=${SAVE_CONFIGURATION}"
export CONFIGURATION=$SAVE_CONFIGURATION
echo "Reset to CONFIGURATION=$CONFIGURATION"
# debugging
printf "debugging CONFIGURATION=%s\n" $CONFIGURATION