#!/usr/bin/env sh
set -eu

COMPOSE_FILE="${COMPOSE_FILE:-docker-compose.production.yml}"
ENV_FILE="${ENV_FILE:-.env.production}"
BACKUP_DIR="${BACKUP_DIR:-./data/backups}"
RETENTION_DAYS="${BACKUP_RETENTION_DAYS:-14}"
SYNOLOGY_BACKUP_DIR="${SYNOLOGY_BACKUP_DIR:-}"

timestamp="$(date -u +%Y%m%d-%H%M%S)"
backup_file="postgres-${timestamp}.dump"

mkdir -p "${BACKUP_DIR}"

docker compose --env-file "${ENV_FILE}" -f "${COMPOSE_FILE}" exec -T postgres sh -lc \
  "PGPASSWORD=\"\$POSTGRES_PASSWORD\" pg_dump -U \"\$POSTGRES_USER\" -d \"\$POSTGRES_DB\" -Fc" \
  > "${BACKUP_DIR}/${backup_file}"

find "${BACKUP_DIR}" -type f -name 'postgres-*.dump' -mtime +"${RETENTION_DAYS}" -delete

if [ -n "${SYNOLOGY_BACKUP_DIR}" ]; then
  mkdir -p "${SYNOLOGY_BACKUP_DIR}"
  cp "${BACKUP_DIR}/${backup_file}" "${SYNOLOGY_BACKUP_DIR}/${backup_file}"
fi

echo "Created backup: ${BACKUP_DIR}/${backup_file}"