cat > install-syncthing.sh << 'EOF'
#!/bin/bash

# Syncthing 一键安装脚本
echo "========================================"
echo "        Syncthing 一键安装脚本"
echo "========================================"

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

log() { echo -e "${GREEN}[✓]${NC} $1"; }
warn() { echo -e "${YELLOW}[!]${NC} $1"; }
error() { echo -e "${RED}[✗]${NC} $1"; }

# 检测系统
detect_os() {
    if [ -f /etc/os-release ]; then
        . /etc/os-release
        OS=$ID
        VERSION=$VERSION_ID
    else
        error "无法检测操作系统"
        exit 1
    fi
}

# 安装 Syncthing
install_syncthing() {
    log "检测到系统: $OS $VERSION"
    
    case $OS in
        ubuntu|debian)
            install_debian ;;
        centos|rhel|fedora|rocky|almalinux)
            install_centos ;;
        *)
            install_generic ;;
    esac
}

# Debian/Ubuntu 安装
install_debian() {
    log "安装 Syncthing (Debian/Ubuntu)"
    
    # 添加 Syncthing 官方仓库
    curl -s https://syncthing.net/release-key.txt | sudo apt-key add -
    echo "deb https://apt.syncthing.net/ syncthing stable" | sudo tee /etc/apt/sources.list.d/syncthing.list
    
    # 更新并安装
    sudo apt update
    sudo apt install -y syncthing
}

# CentOS/RHEL 安装
install_centos() {
    log "安装 Syncthing (CentOS/RHEL)"
    
    # 添加 Syncthing 官方仓库
    cat > /etc/yum.repos.d/syncthing.repo << REPO
[syncthing]
name=Syncthing
baseurl=https://syncthing.net/repo/redhat
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://syncthing.net/release-key.txt
REPO
    
    # 安装
    if command -v dnf &> /dev/null; then
        sudo dnf install -y syncthing
    else
        sudo yum install -y syncthing
    fi
}

# 通用安装方法
install_generic() {
    log "使用通用安装方法"
    
    # 下载最新版本
    LATEST_VERSION=$(curl -s https://api.github.com/repos/syncthing/syncthing/releases/latest | grep '"tag_name":' | sed -E 's/.*"([^"]+)".*/\1/')
    ARCH=$(uname -m)
    
    case $ARCH in
        x86_64) ARCH="amd64" ;;
        aarch64) ARCH="arm64" ;;
        armv7l) ARCH="armv7" ;;
        *) ARCH="amd64" ;;
    esac
    
    log "下载 Syncthing $LATEST_VERSION ($ARCH)"
    
    # 下载并解压
    cd /tmp
    wget -q https://github.com/syncthing/syncthing/releases/download/${LATEST_VERSION}/syncthing-linux-${ARCH}-${LATEST_VERSION}.tar.gz
    tar -xzf syncthing-linux-${ARCH}-${LATEST_VERSION}.tar.gz
    sudo cp syncthing-linux-${ARCH}-${LATEST_VERSION}/syncthing /usr/local/bin/
    sudo chmod +x /usr/local/bin/syncthing
}

# 创建系统服务
create_service() {
    log "创建系统服务"
    
    # 创建用户和目录
    if ! id syncthing &>/dev/null; then
        sudo useradd -r -s /bin/false -d /var/lib/syncthing -m syncthing
    fi
    
    sudo mkdir -p /var/lib/syncthing/{config,sync}
    sudo chown -R syncthing:syncthing /var/lib/syncthing
    
    # 创建 systemd 服务
    cat > /tmp/syncthing.service << SERVICE
[Unit]
Description=Syncthing
Documentation=man:syncthing(1)
After=network.target

[Service]
User=syncthing
ExecStart=/usr/bin/syncthing serve --no-browser --no-restart --home=/var/lib/syncthing/config
Restart=on-failure
RestartSec=5
SuccessExitStatus=3 4
RestartForceExitStatus=3 4

[Install]
WantedBy=multi-user.target
SERVICE

    sudo mv /tmp/syncthing.service /etc/systemd/system/
    sudo systemctl daemon-reload
}

# 配置防火墙
setup_firewall() {
    if command -v ufw &> /dev/null; then
        log "配置 UFW 防火墙"
        sudo ufw allow 8384/tcp comment "Syncthing Web UI"
        sudo ufw allow 22000/tcp comment "Syncthing Transfer"
        sudo ufw allow 21027/udp comment "Syncthing Discovery"
    elif command -v firewall-cmd &> /dev/null; then
        log "配置 FirewallD"
        sudo firewall-cmd --permanent --add-port=8384/tcp
        sudo firewall-cmd --permanent --add-port=22000/tcp
        sudo firewall-cmd --permanent --add-port=21027/udp
        sudo firewall-cmd --reload
    fi
}

# 启动服务
start_service() {
    log "启动 Syncthing 服务"
    sudo systemctl enable syncthing
    sudo systemctl start syncthing
    
    # 等待服务启动
    sleep 3
    
    if sudo systemctl is-active --quiet syncthing; then
        log "Syncthing 服务启动成功"
    else
        error "Syncthing 服务启动失败"
        sudo systemctl status syncthing
    fi
}

# 显示安装信息
show_info() {
    echo ""
    echo "========================================"
    echo "        Syncthing 安装完成！"
    echo "========================================"
    echo ""
    echo "访问地址: https://$(hostname -I | awk '{print $1}'):8384"
    echo ""
    echo "管理命令:"
    echo "  sudo systemctl start syncthing     # 启动"
    echo "  sudo systemctl stop syncthing      # 停止"
    echo "  sudo systemctl restart syncthing   # 重启"
    echo "  sudo systemctl status syncthing    # 状态"
    echo ""
    echo "默认端口:"
    echo "  - Web 界面: 8384/tcp"
    echo "  - 文件传输: 22000/tcp"
    echo "  - 设备发现: 21027/udp"
    echo ""
    warn "首次访问需要设置管理员密码"
    echo ""
}

# 主函数
main() {
    detect_os
    install_syncthing
    create_service
    setup_firewall
    start_service
    show_info
}

# 运行安装
main
EOF

chmod +x install-syncthing.sh
./install-syncthing.sh