#!/bin/bash
# 数据备份脚本
# 用于备份重要数据

# 获取脚本所在目录
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
PROJECT_DIR="$(dirname "$SCRIPT_DIR")"
cd "$PROJECT_DIR"

echo "=========================================="
echo "开始备份: $(date '+%Y-%m-%d %H:%M:%S')"
echo "=========================================="

# 配置
BACKUP_DIR="${PROJECT_DIR}/backups"
DATE=$(date +"%Y%m%d_%H%M%S")
KEEP_DAYS=30

# 创建备份目录
mkdir -p "$BACKUP_DIR"

echo "备份目录: $BACKUP_DIR"
echo "备份日期: $DATE"
echo ""

# 1. 备份数据目录
echo "[1/3] 备份数据目录..."
if [ -d "data" ]; then
    DATA_BACKUP_FILE="${BACKUP_DIR}/data_${DATE}.tar.gz"
    tar -czf "$DATA_BACKUP_FILE" data/
    echo "✅ 数据备份完成: $DATA_BACKUP_FILE"
    echo "   文件大小: $(du -h "$DATA_BACKUP_FILE" | cut -f1)"
else
    echo "⚠️  data目录不存在，跳过数据备份"
fi

# 2. 备份日志目录（可选）
echo ""
echo "[2/3] 备份日志目录..."
if [ -d "logs" ]; then
    LOGS_BACKUP_FILE="${BACKUP_DIR}/logs_${DATE}.tar.gz"
    tar -czf "$LOGS_BACKUP_FILE" logs/
    echo "✅ 日志备份完成: $LOGS_BACKUP_FILE"
    echo "   文件大小: $(du -h "$LOGS_BACKUP_FILE" | cut -f1)"
else
    echo "⚠️  logs目录不存在，跳过日志备份"
fi

# 3. 清理旧备份
echo ""
echo "[3/3] 清理${KEEP_DAYS}天前的旧备份..."
OLD_BACKUPS=$(find "$BACKUP_DIR" -name "*.tar.gz" -mtime +${KEEP_DAYS} -print | wc -l)
if [ "$OLD_BACKUPS" -gt 0 ]; then
    find "$BACKUP_DIR" -name "*.tar.gz" -mtime +${KEEP_DAYS} -delete
    echo "✅ 已删除 ${OLD_BACKUPS} 个旧备份文件"
else
    echo "✅ 没有需要清理的旧备份"
fi

# 统计
echo ""
echo "=========================================="
echo "备份完成: $(date '+%Y-%m-%d %H:%M:%S')"
echo "备份文件数量: $(ls -1 "$BACKUP_DIR"/*.tar.gz 2>/dev/null | wc -l)"
echo "总备份大小: $(du -sh "$BACKUP_DIR" 2>/dev/null | cut -f1)"
echo "=========================================="

echo ""
echo "✅ 备份任务完成！"
exit 0