#!/bin/bash
# database/scripts/backup.sh
set -e

# ============================================================================
# CONFIGURATION
# ============================================================================

CONTAINER_NAME="${CONTAINER_NAME:-aurganize-postgres}"

# Host directory (on your laptop / machine)
BACKUP_DIR="${BACKUP_DIR:-$HOME/workspace/db_backup/aurganize_backups}"

DB_NAME="${DB_NAME:-aurganize_dev}"
DB_USER="${DB_USER:-aurganize_backend_api}"
RETENTION_DAYS="${RETENTION_DAYS:-30}"

# Ensure host backup directory exists
mkdir -p "${BACKUP_DIR}"

# Timestamped filename on host
TIMESTAMP=$(date +"%Y%m%d_%H%M%S")
BACKUP_FILE="${BACKUP_DIR}/${DB_NAME}_${TIMESTAMP}.sql.gz"

echo "==================================================================="
echo "PostgreSQL Backup (Docker) - $(date)"
echo "==================================================================="
echo "Container: ${CONTAINER_NAME}"
echo "Database : ${DB_NAME}"
echo "Backup   : ${BACKUP_FILE}"
echo ""

# ============================================================================
# BACKUP EXECUTION
# ============================================================================

echo "Creating backup inside Docker container..."

docker exec -i "${CONTAINER_NAME}" \
  pg_dump -U "${DB_USER}" -d "${DB_NAME}" --format=plain --no-owner --no-privileges \
  | gzip > "${BACKUP_FILE}"

# ============================================================================
# VERIFY BACKUP
# ============================================================================

if [ -f "${BACKUP_FILE}" ]; then
    SIZE=$(du -h "${BACKUP_FILE}" | cut -f1)
    echo "✓ Backup created successfully (${SIZE})"
else
    echo "✗ Backup failed!"
    exit 1
fi

# ============================================================================
# CLEANUP OLD BACKUPS
# ============================================================================

echo ""
echo "Cleaning up old backups (older than ${RETENTION_DAYS} days)..."

find "${BACKUP_DIR}" -name "${DB_NAME}_*.sql.gz" -type f -mtime +${RETENTION_DAYS} -delete

# ============================================================================
# LIST BACKUPS
# ============================================================================

echo ""
echo "Available backups:"
ls -lh "${BACKUP_DIR}/${DB_NAME}"_*.sql.gz 2>/dev/null || echo "No backups found."

echo ""
echo "==================================================================="
echo "Backup Complete!"
echo "==================================================================="