#!/usr/bin/env bash
# 备份 1Panel 管理的 Postgres（直接 docker exec 进它的容器，不依赖宿主端口）
#
#   ./scripts/backup-db.sh              # 输出 backups/db-YYYY-MM-DD-HHMMSS.sql.gz
#   KEEP_DAYS=7 ./scripts/backup-db.sh  # 顺手删掉 7 天前的备份
#
# cron（每天 4 点）：
#   0 4 * * * cd /opt/fashion/backend && KEEP_DAYS=7 ./scripts/backup-db.sh >> .deploy/backup.log 2>&1
set -euo pipefail
cd "$(dirname "$0")/.."

[ -f .env ] || { echo "!! 缺少 .env"; exit 1; }
set -a; . ./.env; set +a

PG_CONTAINER="${PG_CONTAINER:?PG_CONTAINER 未设置：填 .env 里那个 postgres 容器名}"
KEEP_DAYS="${KEEP_DAYS:-0}"
mkdir -p backups

OUT="backups/db-$(date +%F-%H%M%S).sql.gz"
echo "==> 备份到 $OUT"
docker exec -e PGPASSWORD="${DB_PASSWORD:?DB_PASSWORD 未设置}" "$PG_CONTAINER" \
  pg_dump -U "${DB_USER:-fashion}" "${DB_NAME:-fashion}" | gzip > "$OUT"

echo "    $(du -h "$OUT" | cut -f1)"

if [ "$KEEP_DAYS" -gt 0 ]; then
  find backups -name 'db-*.sql.gz' -mtime +"$KEEP_DAYS" -print -delete
fi

echo "==> 完成"