#!/bin/bash

# 下载地址
DOWNLOAD_URL="https://github.com/bqlpfy/forward-panel/releases/download/gost/gost"
INSTALL_DIR="/etc/gost"

# 显示菜单
show_menu() {
  echo "==============================================="
  echo "              管理脚本"
  echo "==============================================="
  echo "请选择操作："
  echo "1. 安装"
  echo "2. 更新"  
  echo "3. 卸载"
  echo "4. 退出"
  echo "==============================================="
}

# 获取用户输入的配置参数
get_config_params() {
  if [[ -z "$SERVER_ADDR" || -z "$SECRET" ]]; then
    echo "请输入配置参数："
    
    if [[ -z "$SERVER_ADDR" ]]; then
      read -p "服务器地址: " SERVER_ADDR
    fi
    
    if [[ -z "$SECRET" ]]; then
      read -p "密钥: " SECRET
    fi
    
    if [[ -z "$SERVER_ADDR" || -z "$SECRET" ]]; then
      echo "❌ 参数不完整，操作取消。"
      exit 1
    fi
  fi
}

# 解析命令行参数
while getopts "a:s:" opt; do
  case $opt in
    a) SERVER_ADDR="$OPTARG" ;;
    s) SECRET="$OPTARG" ;;
    *) echo "❌ 无效参数"; exit 1 ;;
  esac
done

# 安装功能
install_gost() {
  echo "🚀 开始安装 GOST..."
  get_config_params
  
  mkdir -p "$INSTALL_DIR"

  # 停止并禁用已有服务
  if systemctl list-units --full -all | grep -Fq "gost.service"; then
    echo "🔍 检测到已存在的gost服务"
    systemctl stop gost 2>/dev/null && echo "🛑 停止服务"
    systemctl disable gost 2>/dev/null && echo "🚫 禁用自启"
  fi

  # 删除旧文件
  [[ -f "$INSTALL_DIR/gost" ]] && echo "🧹 删除旧文件 gost" && rm -f "$INSTALL_DIR/gost"

  # 下载 gost
  echo "⬇️ 下载 gost 中..."
  curl -L "$DOWNLOAD_URL" -o "$INSTALL_DIR/gost"
  if [[ ! -f "$INSTALL_DIR/gost" || ! -s "$INSTALL_DIR/gost" ]]; then
    echo "❌ 下载失败，请检查网络或下载链接。"
    exit 1
  fi
  chmod +x "$INSTALL_DIR/gost"
  echo "✅ 下载完成"

  # 打印版本
  echo "🔎 gost 版本：$($INSTALL_DIR/gost -V)"

  # 写入 config.json
  CONFIG_FILE="$INSTALL_DIR/config.json"
  if [[ -f "$CONFIG_FILE" ]]; then
    echo "⏭️ 跳过配置文件: config.json (已存在)"
  else
    echo "📄 创建新配置: config.json"
    cat > "$CONFIG_FILE" <<EOF
{
  "addr": "$SERVER_ADDR",
  "secret": "$SECRET"
}
EOF
  fi

  # 写入 gost.json
  GOST_CONFIG="$INSTALL_DIR/gost.json"
  if [[ -f "$GOST_CONFIG" ]]; then
    echo "⏭️ 跳过配置文件: gost.json (已存在)"
  else
    echo "📄 创建新配置: gost.json"
    cat > "$GOST_CONFIG" <<EOF
{}
EOF
  fi

  # 加强权限
  chmod 600 "$INSTALL_DIR"/*.json

  # 创建 systemd 服务
  SERVICE_FILE="/etc/systemd/system/gost.service"
  cat > "$SERVICE_FILE" <<EOF
[Unit]
Description=Gost Proxy Service
After=network.target

[Service]
WorkingDirectory=$INSTALL_DIR
ExecStart=$INSTALL_DIR/gost
Restart=on-failure

[Install]
WantedBy=multi-user.target
EOF

  # 启动服务
  systemctl daemon-reload
  systemctl enable gost
  systemctl start gost

  # 检查状态
  echo "🔄 检查服务状态..."
  if systemctl is-active --quiet gost; then
    echo "✅ 安装完成，gost服务已启动并设置为开机启动。"
    echo "📁 配置目录: $INSTALL_DIR"
    echo "🔧 服务状态: $(systemctl is-active gost)"
  else
    echo "❌ gost服务启动失败，请执行以下命令查看日志："
    echo "journalctl -u gost -f"
  fi
}

# 更新功能
update_gost() {
  echo "🔄 开始更新 GOST..."
  
  if [[ ! -d "$INSTALL_DIR" ]]; then
    echo "❌ GOST 未安装，请先选择安装。"
    return 1
  fi

  # 先下载新版本
  echo "⬇️ 下载最新版本..."
  curl -L "$DOWNLOAD_URL" -o "$INSTALL_DIR/gost.new"
  if [[ ! -f "$INSTALL_DIR/gost.new" || ! -s "$INSTALL_DIR/gost.new" ]]; then
    echo "❌ 下载失败。"
    return 1
  fi

  # 停止服务
  if systemctl list-units --full -all | grep -Fq "gost.service"; then
    echo "🛑 停止 gost 服务..."
    systemctl stop gost
  fi

  # 替换文件
  mv "$INSTALL_DIR/gost.new" "$INSTALL_DIR/gost"
  chmod +x "$INSTALL_DIR/gost"
  
  # 打印版本
  echo "🔎 新版本：$($INSTALL_DIR/gost -V)"

  # 重启服务
  echo "🔄 重启服务..."
  systemctl start gost
  
  echo "✅ 更新完成，服务已重新启动。"
}

# 卸载功能
uninstall_gost() {
  echo "🗑️ 开始卸载 GOST..."
  
  read -p "确认卸载 GOST 吗？此操作将删除所有相关文件 (y/N): " confirm
  if [[ "$confirm" != "y" && "$confirm" != "Y" ]]; then
    echo "❌ 取消卸载"
    return 0
  fi

  # 停止并禁用服务
  if systemctl list-units --full -all | grep -Fq "gost.service"; then
    echo "🛑 停止并禁用服务..."
    systemctl stop gost 2>/dev/null
    systemctl disable gost 2>/dev/null
  fi

  # 删除服务文件
  if [[ -f "/etc/systemd/system/gost.service" ]]; then
    rm -f "/etc/systemd/system/gost.service"
    echo "🧹 删除服务文件"
  fi

  # 删除安装目录
  if [[ -d "$INSTALL_DIR" ]]; then
    rm -rf "$INSTALL_DIR"
    echo "🧹 删除安装目录: $INSTALL_DIR"
  fi

  # 重载 systemd
  systemctl daemon-reload

  echo "✅ 卸载完成"
}

# 主逻辑
main() {
  # 如果提供了命令行参数，直接执行安装
  if [[ -n "$SERVER_ADDR" && -n "$SECRET" ]]; then
    install_gost
    exit 0
  fi

  # 显示交互式菜单
  while true; do
    show_menu
    read -p "请输入选项 (1-4): " choice
    
    case $choice in
      1)
        install_gost
        break
        ;;
      2)
        update_gost
        break
        ;;
      3)
        uninstall_gost
        break
        ;;
      4)
        echo "👋 退出脚本"
        exit 0
        ;;
      *)
        echo "❌ 无效选项，请输入 1-4"
        echo ""
        ;;
    esac
  done
}

# 执行主函数
main