#!/usr/bin/env bash
# 备份生产 Postgres 数据
# 用法：./deploy/scripts/backup-db.sh [输出目录]

set -euo pipefail

ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
cd "$ROOT_DIR"

ENV_FILE="deploy/.env.prod"
OUT_DIR="${1:-./backups}"
COMPOSE_FILE="docker-compose.prod.yml"

if [[ ! -f "$ENV_FILE" ]]; then
  echo "缺少 $ENV_FILE" >&2
  exit 1
fi

# shellcheck disable=SC1090
set -a
source <(sed 's/\r$//' "$ENV_FILE" | grep -v '^\s*#' | grep -v '^\s*$' || true)
set +a

mkdir -p "$OUT_DIR"
STAMP="$(date +%Y%m%d_%H%M%S)"
FILE="${OUT_DIR}/kefu_cloud_pg_${STAMP}.sql.gz"

echo "备份到 $FILE …"
docker compose -f "$COMPOSE_FILE" --env-file "$ENV_FILE" exec -T postgres \
  pg_dump -U "${DB_USER:-kefu}" "${DB_NAME:-kefu_cloud}" | gzip > "$FILE"

echo "完成: $FILE ($(du -h "$FILE" | awk '{print $1}'))"