#!/bin/bash

# Variables
BACKUP_DIR="./testbak"  # Change this to your desired backup directory
TIMESTAMP=$(date +"%Y%m%d_%H%M%S")

# List of volumes to backup
#VOLUMES=("nc202501_redis" "nc202501_oo_data" "nc202501_es_root" "nc202501_es_index" "nc202501_db" "nc202501_clamav")  # Replace with your volume names
VOLUMES=("nc202501_redis" "nc202501_oo_data" "nc202501_es_root"  "nc202501_clamav")  # Replace with your volume names

# Ensure backup directory exists
mkdir -p "$BACKUP_DIR"

# Function to check if a volume is empty
is_volume_empty() {
  local volume_name=$1

  # Use a temporary container to check if the volume is empty
  if docker run --rm -v "$volume_name:/volume" alpine sh -c '[ -z "$(ls -A /volume)" ]'; then
    return 0  # Volume is empty
  else
    return 1  # Volume is not empty
  fi
}


# Function to get the next sequence number for a volume
get_next_sequence_number() {
  local volume_name=$1
  local sequence=1

  # Find the highest sequence number for the volume
  while [ -f "$BACKUP_DIR/${volume_name}_backup_$(printf "%04d" $sequence)_*.tar.bz2" ]; do  
    sequence=$((sequence + 1))
  done

  echo "$sequence"
}

# Loop through each volume and perform the backup
for volume in "${VOLUMES[@]}"; do

  # Check if the volume is empty
  if is_volume_empty "$volume"; then
    echo "Skipping empty volume: $volume"
    continue
  fi

  # Get the next sequence number for this volume
  sequence=$(get_next_sequence_number "$volume")

  # Define the backup file name
  
  BACKUP_FILE="$BACKUP_DIR/${volume}_backup-$(printf "%04d" $sequence)_${TIMESTAMP}.tar.bz2"
  # Create a temporary container to backup the volume
  echo "Backing up volume: $volume to $BACKUP_FILE"
  # docker run --rm \
  #  -v "$BACKUP_DIR:/backup" \
  #  -v "$volume:/volume" \
  #  alpine tar czf "/backup/${volume}_backup_${sequence}_${TIMESTAMP}.tar.bz2" -C / volume
#  echo docker run --rm -v $volume:/volume -v $BACKUP_DIR:/backup" --rm loomchild/volume-backup  backup -v ${volume}_backup-$(printf "%04d" $sequence)_${TIMESTAMP}" 
  docker run -v "$volume:/volume" -v "$BACKUP_DIR:/backup" --rm loomchild/volume-backup  backup -v ${volume}_backup-$(printf "%04d" $sequence)_${TIMESTAMP} 



  # Check if the backup was successful
  if [ $? -eq 0 ]; then
    echo "Backup completed successfully: $BACKUP_FILE"
  else
    echo "Backup failed for volume: $volume!"
    exit 1
  fi
done

echo "All backups completed successfully!"