#!/bin/bash

# --- Configuration ---
BACKUP_DIR="./backup"
TIMESTAMP=$(date +%Y%m%d_%H%M%S)
BACKUP_FILENAME="vikunja_backup_${TIMESTAMP}.tar.gz"

# Data directories and files to include in the backup
# This includes the MariaDB volume, the Vikunja files volume, and the docker-compose.yml
FILES_TO_BACKUP="docker-compose.yml db files"

# Exit immediately if a command exits with a non-zero status
set -e

echo "Starting Vikunja backup process at ${TIMESTAMP}..."

# 1. Stop all services (keeping volumes intact)
echo "1. Shutting down Docker services (docker compose down)..."
# Use '-v' to remove volumes if needed, but here we just want to stop containers
docker compose down

# 2. Ensure the backup directory exists
echo "2. Creating backup directory: ${BACKUP_DIR}"
mkdir -p "${BACKUP_DIR}"

# 3. Create the timestamped tar archive
echo "3. Creating archive: ${BACKUP_DIR}/${BACKUP_FILENAME}"
# 'tar' command explanation:
# - c: Create a new archive
# - z: Compress the archive using gzip
# - v: Verbose output (show files being added)
# - f: Specify the filename
# Note: The data directories (db and files) and the compose file are included.
tar -czvf "${BACKUP_DIR}/${BACKUP_FILENAME}" ${FILES_TO_BACKUP}

# 4. Restart the services
echo "4. Bringing Docker services back up (docker compose up -d)..."
docker compose up -d

# 5. Completion message
echo "--------------------------------------------------------"
echo "✅ Backup successfully completed!"
echo "Archive saved to: ${BACKUP_DIR}/${BACKUP_FILENAME}"
echo "Vikunja services are now running again."
echo "--------------------------------------------------------"