using Microsoft.Win32;

namespace Netch.Utils
{
    public static class TUNTAP
    {
        public static string TUNTAP_COMPONENT_ID_0901 = "tap0901";
        public static string TUNTAP_COMPONENT_ID_0801 = "tap0801";
        public static string NETWORK_KEY = "SYSTEM\\CurrentControlSet\\Control\\Network\\{4D36E972-E325-11CE-BFC1-08002BE10318}";
        public static string ADAPTER_KEY = "SYSTEM\\CurrentControlSet\\Control\\Class\\{4D36E972-E325-11CE-BFC1-08002BE10318}";

        /// <summary>
        ///     获取 TUN/TAP 适配器 ID
        /// </summary>
        /// <returns>适配器 ID</returns>
        public static string GetComponentID()
        {
            var adaptersRegistry = Registry.LocalMachine.OpenSubKey(ADAPTER_KEY);

            foreach (var adapterRegistryName in adaptersRegistry.GetSubKeyNames())
            {
                if (adapterRegistryName != "Configuration" && adapterRegistryName != "Properties")
                {
                    var adapterRegistry = adaptersRegistry.OpenSubKey(adapterRegistryName);

                    var adapterComponentId = adapterRegistry.GetValue("ComponentId", "").ToString();
                    if (adapterComponentId == TUNTAP_COMPONENT_ID_0901 || adapterComponentId == TUNTAP_COMPONENT_ID_0801)
                    {
                        return adapterRegistry.GetValue("NetCfgInstanceId", "").ToString();
                    }
                }
            }

            return "";
        }

        /// <summary>
        ///     获取 TUN/TAP 适配器名称
        /// </summary>
        /// <param name="componentId">适配器 ID</param>
        /// <returns>适配器名称</returns>
        public static string GetName(string componentId)
        {
            var registry = Registry.LocalMachine.OpenSubKey(string.Format("{0}\\{1}\\Connection", NETWORK_KEY, componentId));

            return registry.GetValue("Name", "").ToString();
        }

        /// <summary>
        ///     创建 TUN/TAP 适配器
        /// </summary>
        /// <returns></returns>
        public static bool Create()
        {
            return false;
        }
    }
}