using Shared;
using Shared.SimpleControl;
using System;

namespace SmartHome
{
    public class SystemRemote
    {
        string txtCheckInternet = "请检查网络连接.";
        string txtLinkSeverLoser = "远程连接与服务器通讯失败。";
        string txtRemoteDevicesHaveNoReply = "一端口无响应。";
        string txtPwdError = "密码错误。";
        string txtLinkNotExist = "连接信息错误。";
        public SystemRemote ()
        {
            if (Language.CurrentLanguage != "Chinese") {
                txtCheckInternet = "Please check your network connection.";
                txtLinkSeverLoser = "Remote connection failed to communicate with the server.";
                txtRemoteDevicesHaveNoReply = "One port is not responding.";
                txtPwdError = "Password error";
                txtLinkNotExist = "Connection information error.";
            }
        }

        /// <summary>
        /// 加密算法
        /// </summary>
        /// <param name="SessionKey"></param>
        /// <param name="SessionLen"></param>
        /// <param name="KeyCode"></param>
        /// <param name="KeyCodeLen"></param>
        void encryption (int [] SessionKey, int SessionLen, int [] KeyCode, int KeyCodeLen)
        {
            int j, flag = 0;
            int session = 0;
            int temp1, temp2, temp = 0;
            int sk = 0; flag = 0; j = SessionLen;
            int k = 0;
            while (0 < j) {
                if (0 < flag) {
                    session = 0xFF & (session + SessionKey [k++]);
                    flag = 0;
                } else {
                    session = 0xFF & (session - SessionKey [k++]);
                    flag = 1;
                }
                j--;
            }
            sk = 0xFF & (session % 15);
            flag = 0;
            j = KeyCodeLen;
            k = 0;
            while (0 < j) {
                temp1 = 0xFF & (KeyCode [k] + (session % j));
                temp1 = 0xFF & (~temp1 + 1);
                temp2 = 0xFF & (temp1 & 0xf0);
                temp1 = 0xFF & (temp1 & 0x0f);
                switch (sk) {
                case 0: temp = 0xFF & ((temp2 >> 4) | (temp1 << 4)); break;
                case 1: temp = 0xFF & ((temp2 + j * 2) | (temp1 + j % 4)); break;
                case 2: temp = 0xFF & ((temp2 + j % 5) | (temp1 + 1)); break;
                case 3: temp = 0xFF & ((temp2 >> 2) | (temp1 << 2)); break;
                case 4: temp = 0xFF & ((temp2 - 5) | (temp1 + 4)); break;
                case 5: temp = 0xFF & ((temp2 % 7) | (temp1 + 4)); break;
                case 6: temp = 0xFF & ((temp2 + j) | (temp1)); break;
                case 7: temp = 0xFF & ((temp2 - j) | (temp1 + j % 2)); break;
                case 8: temp = 0xFF & ((~temp2) | (temp1 + j % 6)); break;
                case 9: temp = 0xFF & ((temp2 + j % 3) | (temp1 + j)); break;
                case 10: temp = 0xFF & ((temp2) | (temp1 + 1)); break;
                case 11: temp = 0xFF & ((temp2) | (temp1)); break;
                case 12: temp = 0xFF & ((temp2 - j) | (temp1 + 4)); break;
                case 13: temp = 0xFF & ((temp2) | (temp1 + j)); break;
                case 14: temp = 0xFF & ((temp2 - 2) | (temp1 - 4)); break;
                default: temp = 0xFF & ((temp2 >> 4) | (temp1 << 4)); break;
                }
                KeyCode [k] = temp;
                k++; j--;
            }
        }

        byte [] makeSurePassword (string Remote_ProjectName, string Remote_UserName, string Remote_Password)
        {
            byte [] tempBytes = new byte [66];

            byte [] b1 = CommonPage.MyEncodingGB2312.GetBytes (Remote_ProjectName);
            //工程备注
            System.Array.Copy (b1, 0, tempBytes, 0, 20 < b1.Length ? 20 : b1.Length);

            //用户名  
            byte [] b2 = CommonPage.MyEncodingGB2312.GetBytes (Remote_UserName);
            System.Array.Copy (b2, 0, tempBytes, 20, 8 < b2.Length ? 8 : b2.Length);

            byte [] b3 = CommonPage.MyEncodingGB2312.GetBytes (Remote_Password);
            int [] KeyCode = new int [8];
            System.Array.Copy (b3, 0, KeyCode, 0, 8 < b3.Length ? 8 : b3.Length);

            int [] SessionKey = new int [] { (int)0x01, 0x01, 0x01, 0x01, (int)0x01, (int)0x01, 0x01, 0x01 };

            //密匙   
            //0xF1 0x05 0x23 0x49 0xac 0xe6 0x5b 0x28   
            tempBytes [36] = (byte)SessionKey [0];
            tempBytes [37] = (byte)SessionKey [1];
            tempBytes [38] = (byte)SessionKey [2];
            tempBytes [39] = (byte)SessionKey [3];
            tempBytes [40] = (byte)SessionKey [4];
            tempBytes [41] = (byte)SessionKey [5];
            tempBytes [42] = (byte)SessionKey [6];
            tempBytes [43] = (byte)SessionKey [7];

            encryption (SessionKey, 8, KeyCode, (byte)8);
            // 远程访问的密码  
            //0x0e  0x0f  0x0e  0x12  0x13  0x12  0x13  0x04            
            tempBytes [28] = (byte)KeyCode [0];
            tempBytes [29] = (byte)KeyCode [1];
            tempBytes [30] = (byte)KeyCode [2];
            tempBytes [31] = (byte)KeyCode [3];
            tempBytes [32] = (byte)KeyCode [4];
            tempBytes [33] = (byte)KeyCode [5];
            tempBytes [34] = (byte)KeyCode [6];
            tempBytes [35] = (byte)KeyCode [7];


            int year = System.DateTime.Now.Year; //ca.get();//获取年份
            int month = System.DateTime.Now.Month; //ca.get(Calendar.MONTH);//获取月份
            int day = System.DateTime.Now.Day; //ca.get(Calendar.DAY_OF_MONTH);//获取日   
            int hour = System.DateTime.Now.Hour; //ca.get(Calendar.HOUR);//小时
            int minute = System.DateTime.Now.Minute; //ca.get(Calendar.MINUTE);//分
            int second = System.DateTime.Now.Second; //ca.get(Calendar.SECOND);//秒

            var yearString = year.ToString ();
            tempBytes [44] = byte.Parse (yearString.Substring (yearString.Length - 2, 2));
            tempBytes [45] = (byte)month;
            tempBytes [46] = (byte)day;
            tempBytes [47] = (byte)hour;
            tempBytes [48] = (byte)minute;
            tempBytes [49] = (byte)second;

            tempBytes [50] = (byte)('H');
            tempBytes [51] = (byte)('D');
            tempBytes [52] = (byte)('L');
            tempBytes [53] = (byte)('-');
            tempBytes [54] = (byte)('O');
            tempBytes [55] = (byte)('N');
            tempBytes [56] = (byte)(' ');
            tempBytes [57] = (byte)(' ');
            tempBytes [58] = (byte)(' ');
            tempBytes [59] = (byte)(' ');


            tempBytes [60] = (byte)('2');
            tempBytes [61] = (byte)('.');
            tempBytes [62] = (byte)('0');
            tempBytes [63] = (byte)('.');
            tempBytes [64] = (byte)('0');
            tempBytes [65] = (byte)('0');
            return tempBytes;
        }

        public bool checeInternet ()
        {
            //byte [] bytes = null;
            //var dateTime = DateTime.Now;
            //System.Threading.Tasks.Task.Run (() => {
            //    bytes = new System.Net.WebClient { Proxy = null }.DownloadData ("http://www.baidu.com");
            //});
            //while ((DateTime.Now - dateTime).TotalMilliseconds < 8000) {
            //    System.Threading.Thread.Sleep (100);
            //    if (bytes != null) {
            //        return true;
            //    }
            //}
            return true;
        }

        bool ShowTip = true;
        //static Alert sssAlert = new Alert ("", "Make sure your gateway is powered ON and connected to WIFI router", "Cancel", "Try again");


        /// <summary>
        /// 连接远程一端口交换机
        /// </summary>
        /// <param name="userName">用户名</param>
        /// <param name="projectName">工程名</param>
        /// <param name="password">密码</param>
        /// <param name="isConnect">连接为真，断开为假</param>
        public string LinkRemote (string userName, string projectName, string password, bool isConnect)
        {
            bool result = false;
            string linkMsg =  "";
            try {
                if (!checeInternet ()) {
                    Application.RunOnMainThread (() => {
                        MainPage.Loading.Hide ();
                    });
                    return txtCheckInternet;
                } else {
                    Application.RunOnMainThread (() => {
                        MainPage.Loading.Start ("Connecting...");
                        MainPage.Loading.CurStatus = true;
                    });

                    //System.Threading.Tasks.Task.Run (() => {
                    byte [] userNameBytes = CommonPage.MyEncodingGB2312.GetBytes (userName);
                    byte [] projectBytes = CommonPage.MyEncodingGB2312.GetBytes (projectName);
                    byte [] firstBytes = new byte [28];
                    //用户名  
                    System.Array.Copy (userNameBytes, 0, firstBytes, 0, 8 < userNameBytes.Length ? 8 : userNameBytes.Length);
                    //工程备注
                    System.Array.Copy (projectBytes, 0, firstBytes, 8, 20 < projectBytes.Length ? 20 : projectBytes.Length);

                    //服务器的子网号设备号固定为1，251
                    //1byte  // 0不存在 1存在
                    //远程访问的用户名         8 bytes
                    //工程备注                 20 bytes
                    //IP地址:                  4bytes
                    //端口:                    2bytes
                    //在线状态：               1byte  0不在线 1在线
                    byte [] firstReturnBytes = Control.ControlBytesSendHasReturn (Command.RemoteFirst, 251, 251, firstBytes);
                    //连接不到远程服务器
                    if (firstReturnBytes == null) {
                        linkMsg = txtLinkSeverLoser;//"，远程连接与服务器通讯失败。";
                        return linkMsg;
                    }
                    //从服务器获取用户远程连接的信息
                    else {
                        if (firstReturnBytes [0] == 0) {
                            return txtLinkNotExist;
                        }
                        byte [] secoudBytes = new byte [7];
                        System.Array.Copy (firstReturnBytes, 29, secoudBytes, 0, 6);
                        secoudBytes [6] = isConnect ? (byte)1 : (byte)0;
                        byte [] secoudBytesReturnBytes = Control.ControlBytesSendHasReturn (Command.RemoteSecoud, 251, 251, secoudBytes);
                        if (!isConnect) {
                            //断开连接远程服务器
                            CommonPage.IsRemote = false;
                            return "200";
                        }
                        var tempBytes = makeSurePassword (projectName, userName, password);
                        //密码验证
                        if (secoudBytesReturnBytes != null) {
                            byte [] isSuccess = Control.ControlBytesSendHasReturn (Command.Remote3th, 0xFF, 0xFF, tempBytes);
                            if (isSuccess == null) {
                                //一端口交换机没有数据回复
                                linkMsg = txtRemoteDevicesHaveNoReply;
                                return linkMsg;
                            }
                            if (isSuccess [0] == 0xF8) {
                                result = true;
                                //远程连接成功
                                linkMsg = "200";
                            } else {
                                //密码错误
                                linkMsg = txtPwdError;
                            }
                        }
                        return linkMsg;
                    }
                }
            } catch (Exception ex) {
                Console.WriteLine (ex.Message);
                return "";
            } finally {
                Application.RunOnMainThread (() => {
                    MainPage.Loading.Hide ();
                });
            }
        }
    }
}