#!/bin/bash

# 备份脚本
# 每日凌晨2点执行，备份重要配置和数据

echo "💾 $(date '+%Y-%m-%d %H:%M:%S') - 开始执行备份任务"

# 定义备份目录
BACKUP_DIR="/var/backups/ocngx"
BACKUP_DATE=$(date '+%Y%m%d_%H%M%S')
BACKUP_FILE="ocngx_backup_${BACKUP_DATE}.tar.gz"

# 创建备份目录
mkdir -p "$BACKUP_DIR"

# 定义需要备份的文件列表
BACKUP_ITEMS="
/etc/AGENT.md
/app/opencode.json
/usr/local/openresty/nginx/conf/nginx.conf
/usr/local/openresty/nginx/conf/conf.d
/usr/local/openresty/nginx/html
/etc/cron-jobs
/etc/cron.d
"

echo "📦 创建备份归档..."

# 创建临时备份目录
TEMP_BACKUP_DIR="/tmp/ocngx_backup_${BACKUP_DATE}"
mkdir -p "$TEMP_BACKUP_DIR"

# 复制重要文件
for item in $BACKUP_ITEMS; do
    if [ -e "$item" ]; then
        echo "  • 备份: $item"
        cp -r "$item" "$TEMP_BACKUP_DIR/" 2>/dev/null
    else
        echo "  • 跳过: $item (不存在)"
    fi
done

# 创建备份信息文件
cat > "$TEMP_BACKUP_DIR/backup_info.txt" << EOF
OCNGX 备份信息
================
备份时间: $(date '+%Y-%m-%d %H:%M:%S')
备份版本: ${BACKUP_DATE}
系统信息: $(uname -a)
磁盘使用: $(df -h / | awk 'NR==2 {print $2 " used, " $4 " free"}')
OpenCode 版本: $(curl -s http://127.0.0.1:3000/global/health 2>/dev/null | grep -o '"version":"[^"]*' | cut -d'"' -f4 || echo "未知")
EOF

# 创建压缩归档
echo "🗜️ 压缩备份文件..."
tar -czf "${BACKUP_DIR}/${BACKUP_FILE}" -C "/tmp" "ocngx_backup_${BACKUP_DATE}" 2>/dev/null

# 检查备份是否成功
if [ -f "${BACKUP_DIR}/${BACKUP_FILE}" ]; then
    BACKUP_SIZE=$(du -h "${BACKUP_DIR}/${BACKUP_FILE}" | cut -f1)
    echo "✅ 备份成功: ${BACKUP_FILE} (${BACKUP_SIZE})"
else
    echo "❌ 备份失败: 无法创建备份文件"
    rm -rf "$TEMP_BACKUP_DIR"
    exit 1
fi

# 清理临时目录
rm -rf "$TEMP_BACKUP_DIR"

# 清理旧备份（保留最近7个）
echo "🧹 清理旧备份文件..."
cd "$BACKUP_DIR"
ls -t ocngx_backup_*.tar.gz 2>/dev/null | tail -n +8 | xargs -r rm -f

# 显示备份目录状态
BACKUP_COUNT=$(ls -1 "$BACKUP_DIR"/ocngx_backup_*.tar.gz 2>/dev/null | wc -l)
echo "📊 备份目录状态: $BACKUP_COUNT 个备份文件"
echo "📁 备份目录大小: $(du -sh "$BACKUP_DIR" 2>/dev/null | cut -f1)"

# 可选：如果配置了外部存储，可以上传备份
# if [ -n "$BACKUP_S3_BUCKET" ]; then
#     echo "☁️ 上传备份到 S3..."
#     aws s3 cp "${BACKUP_DIR}/${BACKUP_FILE}" "s3://${BACKUP_S3_BUCKET}/ocngx-backups/" 2>/dev/null
# fi

echo "✅ $(date '+%Y-%m-%d %H:%M:%S') - 备份任务完成"
echo "---"