#!/usr/bin/env bash
set -euo pipefail

# ============================================
# Xray 备份脚本
# 备份内容：Xray 配置 + .env 凭据 + 网络调优
# 定时执行: crontab -e → 0 3 * * 0 /opt/vps-xray/backup.sh
# ============================================

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
cd "$SCRIPT_DIR"

# 加载配置
if [ -f .env ]; then
    sed -i 's/\r$//' .env
    set -a; source .env; set +a
fi

BACKUP_DIR="${BACKUP_DIR:-/var/backups/xray}"
DATE=$(date +%Y%m%d_%H%M%S)
KEEP_DAYS=30

log() { echo "[$(date '+%Y-%m-%d %H:%M:%S')] $*"; }

mkdir -p "$BACKUP_DIR"

# 1. 备份 Xray 配置
log "正在备份 Xray 配置..."
if [ -f /usr/local/etc/xray/config.json ]; then
    tar czf "${BACKUP_DIR}/xray_config_${DATE}.tar.gz" \
        -C /usr/local/etc xray/
    log "Xray 配置备份完成: xray_config_${DATE}.tar.gz"
else
    log "警告: Xray 配置文件不存在，跳过"
fi

# 2. 备份部署配置（.env + 脚本）
log "正在备份部署配置..."
tar czf "${BACKUP_DIR}/deploy_config_${DATE}.tar.gz" \
    -C "$SCRIPT_DIR" \
    $(ls .env deploy.sh backup.sh uninstall.sh 2>/dev/null)
log "部署配置备份完成: deploy_config_${DATE}.tar.gz"

# 3. 备份网络调优配置
if [ -f /etc/sysctl.d/99-xray-turbo.conf ]; then
    log "正在备份网络调优配置..."
    cp /etc/sysctl.d/99-xray-turbo.conf "${BACKUP_DIR}/sysctl_${DATE}.conf"
    log "网络调优备份完成: sysctl_${DATE}.conf"
fi

# 4. 清理过期备份
log "清理 ${KEEP_DAYS} 天前的备份..."
deleted=$(find "$BACKUP_DIR" -type f -mtime +${KEEP_DAYS} -print -delete | wc -l)
log "已清理 ${deleted} 个过期文件"

# 5. 输出备份摘要
echo ""
log "===== 备份完成 ====="
log "备份目录: ${BACKUP_DIR}/"
ls -lh "${BACKUP_DIR}/"*"${DATE}"* 2>/dev/null || true
echo ""
log "总备份空间占用: $(du -sh "${BACKUP_DIR}" | cut -f1)"