#!/bin/bash
# =================================================================
# 🧹 FNOS (Debian) Tailscale 终极物理超度 (彻底卸载)
# 核心功能：停服务、删配置、清依赖、拔网卡、净路由
# =================================================================

# 定义颜色
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
BLUE='\033[0;34m'
RED='\033[0;31m'
NC='\033[0m'

echo -e "${YELLOW}>>> [1/8] 正在停止所有 Tailscale 相关服务...${NC}"
sudo systemctl stop tailscaled 2>/dev/null
sudo systemctl stop tailscale-persistence.service 2>/dev/null
sudo systemctl stop tailscale-receive.service 2>/dev/null
sudo systemctl stop tailscale-ethtool.service 2>/dev/null

echo -e "${YELLOW}>>> [2/8] 禁用服务并销毁自定义配置文件...${NC}"
sudo systemctl disable tailscale-persistence.service 2>/dev/null
sudo systemctl disable tailscale-receive.service 2>/dev/null
sudo systemctl disable tailscale-ethtool.service 2>/dev/null

# 强制删除服务文件，加 -f 防止文件不存在时报错中断
sudo rm -f /etc/systemd/system/tailscale-persistence.service
sudo rm -f /etc/systemd/system/tailscale-receive.service
sudo rm -f /etc/systemd/system/tailscale-ethtool.service
sudo rm -rf /etc/systemd/system/tailscaled.service.d

echo -e "${YELLOW}>>> [3/8] 物理超度主程序及依赖 (Purge)...${NC}"
sudo apt-get purge tailscale -y
sudo apt-get autoremove -y

echo -e "${YELLOW}>>> [4/8] 斩断软件源连结 (防止残留更新)...${NC}"
sudo rm -f /etc/apt/sources.list.d/tailscale.list
sudo rm -f /usr/share/keyrings/tailscale-archive-keyring.gpg

echo -e "${YELLOW}>>> [5/8] 还原系统内核与转发配置...${NC}"
sudo rm -f /etc/sysctl.d/99-tailscale.conf
# 刷新 sysctl
sudo sysctl --system >/dev/null 2>&1

echo -e "${YELLOW}>>> [6/8] 冲洗防火墙与 NAT 伪装规则...${NC}"
sudo iptables -t nat -F
sudo rm -f /etc/iptables/rules.v4

echo -e "${YELLOW}>>> [7/8] 清除残留挂载点与顽固缓存...${NC}"
# 卸载挂载点
sudo umount /var/lib/tailscale 2>/dev/null
# 强制删除缓存与残留目录
sudo rm -rf /var/lib/tailscale
sudo rm -rf /var/cache/tailscale
sudo rm -rf /run/tailscale

echo -e "${YELLOW}>>> [8/8] 刷新系统守护进程...${NC}"
sudo systemctl daemon-reload

echo ""
echo -e "${GREEN}🎉 物理超度完成！Tailscale 及所有修改已被彻底骨灰级清除。${NC}"
echo -e "${RED}🚨 系统底层网络需要释放，请立即输入以下重启命令！${NC}"
echo ""
echo -e "${BLUE}sudo reboot${NC}"
echo ""