#!/usr/bin/env bash
# backup.sh — 备份 moziplus v2 数据到 NAS
set -euo pipefail

TARGET_DIR="${MOZIPLUS_V2_DIR:-$HOME/.sanguo_projects/sanguo_moziplus_v2}"
NAS_BASE="/Volumes/stock"
BACKUP_SUBDIR="moziplus-v2-backups"
PM2_NAME="sanguo-moziplus-v2"
STOP_SERVICE=false

usage() {
  echo "Usage: $0 [options]"
  echo ""
  echo "Options:"
  echo "  --target=DIR    安装目录"
  echo "  --nas=DIR       NAS 挂载点 (default: /Volumes/stock)"
  echo "  --stop          备份前停服务（确保数据一致性）"
  echo "  -h, --help      显示帮助"
  echo ""
  echo "Note: 如果不停服务，SQLite 可能有不一致的快照"
  echo "      对于日常备份通常没问题，重要备份建议加 --stop"
  exit 0
}

for arg in "$@"; do
  case "$arg" in
    --target=*) TARGET_DIR="${arg#*=}" ;;
    --nas=*) NAS_BASE="${arg#*=}" ;;
    --stop) STOP_SERVICE=true ;;
    -h|--help) usage ;;
  esac
done

DATA_DIR="$TARGET_DIR/data"
CONFIG_DIR="$TARGET_DIR/config"

if [ ! -d "$DATA_DIR" ]; then
  echo "❌ Data directory not found: $DATA_DIR" && exit 1
fi

if [ ! -d "$NAS_BASE" ]; then
  echo "❌ NAS not mounted: $NAS_BASE"
  echo "   Mount NAS first: open smb://192.168.2.154/"
  exit 1
fi

BACKUP_DIR="$NAS_BASE/$BACKUP_SUBDIR"
TIMESTAMP=$(date +%Y%m%d-%H%M%S)
BACKUP_NAME="backup-$TIMESTAMP"

echo "💾 Backing up moziplus v2"
echo "   Data:   $DATA_DIR"
echo "   Config: $CONFIG_DIR"
echo "   Target: $BACKUP_DIR/$BACKUP_NAME"

mkdir -p "$BACKUP_DIR"

# ── 停服务（可选）──
if [ "$STOP_SERVICE" = true ]; then
  echo ""
  echo "🛑 Stopping service for consistent backup..."
  pm2 stop "$PM2_NAME" 2>/dev/null || true
fi

# ── 备份 ──
echo ""
echo "📦 Copying data..."
mkdir -p "$BACKUP_DIR/$BACKUP_NAME"
rsync -a "$DATA_DIR/" "$BACKUP_DIR/$BACKUP_NAME/data/"
echo "📦 Copying config..."
rsync -a "$CONFIG_DIR/" "$BACKUP_DIR/$BACKUP_NAME/config/"

# ── 记录元数据 ──
cat > "$BACKUP_DIR/$BACKUP_NAME/metadata.json" << EOF
{
  "timestamp": "$TIMESTAMP",
  "date": "$(date "+%Y-%m-%dT%H:%M:%S%z")",
  "source": "$TARGET_DIR",
  "service_stopped": $STOP_SERVICE,
  "version": "$(cd "$TARGET_DIR" && python3 -c 'import tomllib; print(tomllib.load(open("pyproject.toml","rb"))["project"]["version"])' 2>/dev/null || echo 'unknown')"
}
EOF

# ── 计算大小 ──
BACKUP_SIZE=$(du -sh "$BACKUP_DIR/$BACKUP_NAME" | cut -f1)

# ── 重启服务 ──
if [ "$STOP_SERVICE" = true ]; then
  echo ""
  echo "▶️  Restarting service..."
  pm2 start "$PM2_NAME" 2>/dev/null || true
fi

# ── 清理旧备份（保留最近 10 个）──
echo ""
echo "🧹 Cleaning old backups (keeping latest 10)..."
cd "$BACKUP_DIR"
ls -d backup-* 2>/dev/null | sort | head -n -10 | xargs rm -rf 2>/dev/null || true

# ── 完成 ──
echo ""
echo "✅ Backup completed"
echo "   Name: $BACKUP_NAME"
echo "   Size: $BACKUP_SIZE"
echo "   Path: $BACKUP_DIR/$BACKUP_NAME"