#!/bin/bash

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

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

# save old CONFIGURATION for later reset
export SAVE_CONFIGURATION=$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
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
fi

# 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

# 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

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
      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
export CONFIGURATION=$SAVE_CONFIGURATION
echo "Reset to CONFIGURATION=$CONFIGURATION"