#!/bin/bash
# =============================================================================
#  追光AI 容器卷备份脚本 (在宿主机上跑)
#  - 把 4 个 docker 卷打包到 /home/ubuntu/zhuiguang-ai-backup/dockers/
#  - 默认保留最近 7 天快照
#  - 用法: bash scripts/backup-volumes.sh
# =============================================================================
set -e

PROJECT="/home/ubuntu/zhuiguang-ai"
BACKUP_ROOT="/home/ubuntu/zhuiguang-ai-backup/dockers"
STAMP=$(date +%Y%m%d-%H%M%S)
BACKUP_DIR="${BACKUP_ROOT}/${STAMP}"
KEEP_DAYS=7

mkdir -p "$BACKUP_DIR"

echo "[backup] $(date) 开始备份容器卷到 $BACKUP_DIR"

# 备份 4 个卷
for vol in zhuiguang_ai_bot_data zhuiguang_ai_bot_public zhuiguang_ai_bot_logs zhuiguang_ai_bot_prisma; do
  if ! docker volume inspect "$vol" >/dev/null 2>&1; then
    echo "[backup] WARN: 卷 $vol 不存在，跳过"
    continue
  fi
  echo "[backup] 备份卷 $vol ..."
  docker run --rm \
    -v "${vol}:/src:ro" \
    -v "${BACKUP_DIR}:/dst" \
    alpine:3.19 \
    tar czf "/dst/${vol}.tgz" -C /src . 2>&1 | tail -3
  echo "[backup]   -> ${vol}.tgz"
done

# 同时备份 .env（敏感文件单独加密存）
if [ -f "$PROJECT/env/.env.production" ]; then
  cp "$PROJECT/env/.env.production" "${BACKUP_DIR}/.env.production"
  echo "[backup] .env.production 已备份"
fi

# 备份清单
{
  echo "# 备份清单 - $(date)"
  echo "STAMP: $STAMP"
  ls -lh "$BACKUP_DIR"
} > "$BACKUP_DIR/INDEX.txt"

echo "[backup] 完成。清单："
ls -lh "$BACKUP_DIR"

# 清理 7 天前的旧备份
echo "[backup] 清理 $KEEP_DAYS 天前的旧备份 ..."
find "$BACKUP_ROOT" -maxdepth 1 -type d -mtime +$KEEP_DAYS -exec rm -rf {} + 2>/dev/null || true

echo "[backup] DONE"