using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.NetworkInformation;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Ultron.Ngrok.Utils
{
    public class NetworkUtils
    {

        public static string url = "www.baidu.com;www.sina.com;www.163.com;ngrok.aaqbee.com";

        public static string[] urls = url.Split(new char[] { ';' });

        public static FormMain fm = null;

        public static void RwiteLog(string message)
        {
            StringBuilder sb = new StringBuilder(NetworkUtils.fm.cmdLogTextArea.Text);
            NetworkUtils.fm.cmdLogTextArea.Text = sb.AppendLine(message).ToString();
            NetworkUtils.fm.cmdLogTextArea.SelectionStart = fm.cmdLogTextArea.Text.Length;
            NetworkUtils.fm.cmdLogTextArea.ScrollToCaret();
        }
        /// <summary>
        /// 检测网络连接状态
        /// </summary>
        /// <param name="urls"></param>
        public static void CheckServeStatus(FormMain form)
        {
            Control.CheckForIllegalCrossThreadCalls = false;

            NetworkUtils.fm = form;

            int errCount = 0;//ping时连接失败个数

            NetworkUtils.RwiteLog("开始检测网络...");

            string checkMsg = string.Empty;

            if (!LocalConnectionStatus())
            {
                checkMsg = "网络异常--无连接";
            }
            else if (!MyPing(urls, out errCount))
            {
                if ((double)errCount / urls.Length >= 0.3)
                {
                    checkMsg = "网络异常--连接多次无响应";
                }
                else
                {
                    checkMsg = "网络不稳定";
                }
            }
            else
            {
                checkMsg = "网络正常";
            }
            NetworkUtils.RwiteLog(checkMsg);
            NetworkUtils.RwiteLog("网络检测结束...");
        }

        private const int INTERNET_CONNECTION_MODEM = 1;
        private const int INTERNET_CONNECTION_LAN = 2;


        [System.Runtime.InteropServices.DllImport("winInet.dll")]
        private static extern bool InternetGetConnectedState(ref int dwFlag, int dwReserved);
        /// <summary>
        /// 判断本地的连接状态
        /// </summary>
        /// <returns></returns>
        private static bool LocalConnectionStatus()
        {
            System.Int32 dwFlag = new Int32();
            if (!InternetGetConnectedState(ref dwFlag, 0))
            {
                NetworkUtils.RwiteLog("本地连接状态--未连网!");
                return false;
            }
            else
            {
                if ((dwFlag & INTERNET_CONNECTION_MODEM) != 0)
                {
                    //NetworkUtils.RwiteLog("本地连接状态--采用调制解调器上网。");
                    return true;
                }
                else if ((dwFlag & INTERNET_CONNECTION_LAN) != 0)
                {
                    //NetworkUtils.RwiteLog("本地连接状态--采用网卡上网。");
                    return true;
                }
            }
            return false;
        }

        /// <summary>
        /// Ping命令检测网络是否畅通
        /// </summary>
        /// <param name="urls">URL数据</param>
        /// <param name="errorCount">ping时连接失败个数</param>
        /// <returns></returns>
        public static bool MyPing(string[] urls, out int errorCount)
        {
            bool isconn = true;
            Ping ping = new Ping();
            errorCount = 0;
            try
            {
                PingReply pr;
                for (int i = 0; i < urls.Length; i++)
                {
                    pr = ping.Send(urls[i]);
                    if (pr.Status != IPStatus.Success)
                    {
                        isconn = false;
                        errorCount++;
                    }
                    //NetworkUtils.RwiteLog("Ping " + urls[i] + "    " + pr.Status.ToString());
                }
            }
            catch
            {
                isconn = false;
                errorCount = urls.Length;
            }
            //if (errorCount > 0 && errorCount < 3)
            //  isconn = true;
            return isconn;
        }
    }
}