#!/bin/sh
# Database Backup Script for SEEN
# Runs daily automated backups with retention policy

set -e

# Configuration
BACKUP_DIR="/backups"
TIMESTAMP=$(date +%Y%m%d_%H%M%S)
BACKUP_FILE="${BACKUP_DIR}/seen_backup_${TIMESTAMP}.sql.gz"
RETENTION_DAYS=${BACKUP_RETENTION_DAYS:-7}

# Create backup directory if it doesn't exist
mkdir -p "${BACKUP_DIR}"

echo "[$(date)] Starting database backup..."

# Perform backup
PGPASSWORD="${POSTGRES_PASSWORD}" pg_dump \
  -h "${POSTGRES_HOST}" \
  -U "${POSTGRES_USER}" \
  -d "${POSTGRES_DB}" \
  --format=plain \
  --no-owner \
  --no-acl \
  | gzip > "${BACKUP_FILE}"

# Check if backup was successful
if [ $? -eq 0 ]; then
  BACKUP_SIZE=$(du -h "${BACKUP_FILE}" | cut -f1)
  echo "[$(date)] Backup completed successfully: ${BACKUP_FILE} (${BACKUP_SIZE})"
else
  echo "[$(date)] ERROR: Backup failed!"
  exit 1
fi

# Clean up old backups
echo "[$(date)] Cleaning up backups older than ${RETENTION_DAYS} days..."
find "${BACKUP_DIR}" -name "seen_backup_*.sql.gz" -type f -mtime +${RETENTION_DAYS} -delete

# List current backups
echo "[$(date)] Current backups:"
ls -lh "${BACKUP_DIR}"/seen_backup_*.sql.gz 2>/dev/null || echo "No backups found"

echo "[$(date)] Backup process completed"