#!/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"
    # TODO: 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
    while [ `ls -1 | wc -l` -gt $keep ]; do
      oldest=`ls -c1 | head -1`
      echo "  ${oldest}"
      rm -rf $oldest
    done

    printf "Keep the last %d backups:\n  " ${BACKUP_SAVED_BACKUPS_NUMBER}
    ls

    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}