using HDLMonitorService.ServiceMonitor;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace HDLMonitorService.UDP
{
    public class Packet
    {
        /// <summary>
        /// 缓冲区
        /// </summary>
        public byte[] Bytes = new byte[1300];
        /// <summary>
        /// 网络套接字
        /// </summary>
        public System.Net.EndPoint RemoteEndPoint = new System.Net.IPEndPoint(System.Net.IPAddress.Any, 0);

        public void Manager()
        {
            try
            {
                if (!"HDLMIRACLE".Equals(System.Text.Encoding.ASCII.GetString(Bytes, 4, 10)))
                {
                    return;
                }
                #region
                byte subnetID = this.Bytes[17]; //源子网号
                byte deviceID = this.Bytes[18]; //源设备号

                //源设备类型
                int deviceType = this.Bytes[19] * 256 + this.Bytes[20];

                int command = Bytes[21] * 256 + Bytes[22]; //操作码控制命令

                byte targetSubnetID = this.Bytes[23];
                byte targetDeviceID = this.Bytes[24];

                var usefulBytes = new byte[] { };
                if (Bytes[16] == 0xFF)
                {
                    usefulBytes = new byte[this.Bytes.Length - 25 - 2];
                    Array.Copy(Bytes, 25 + 2, usefulBytes, 0, usefulBytes.Length);
                }
                else
                {
                    //有用的附加数据
                    usefulBytes = new byte[this.Bytes[16] - 11];
                    Array.Copy(Bytes, 25, usefulBytes, 0, usefulBytes.Length);
                }

                switch (command)//记录成功返回的数据
                {
                    case 0x3012:
                        if (ServerMonitor.ServerSendCount > 6)
                        {
                            var minuite = (ServerMonitor.ServerSendCount * 10) / 60;
                            //日志埋点
                            //PointLogUtil.LogsUtil.WriteLog("数据转发服务已恢复正常，不可用状态持续" + minuite + "分钟！");
                            System.IO.File.AppendAllText(AppDomain.CurrentDomain.BaseDirectory + $"UDPStart.txt", "数据转发服务已恢复正常，不可用状态持续" + minuite + "分钟！\r\n\r\n");
                        }
                        //收到数据清零
                        ServerMonitor.ServerSendCount = 0;

                        if ((DateTime.Now - ServerMonitor.sendTime).TotalSeconds >= 3)//超过3000毫秒，肯定有问题
                        {
                            ServerMonitor.InternetDeleyCount++;//记录延迟数据
                            if (ServerMonitor.InternetDeleyCount == 5)
                            {
                                //日志埋点
                                //PointLogUtil.LogsUtil.WriteLog("数据转发服务已连续超过5次响应数据延迟超过3秒，请检查服务状态和数据！");
                            }
                        }
                        else //正常
                        {
                            ServerMonitor.InternetDeleyCount = 0;
                        }
                        break;
                    default:

                        break;
                }
                #endregion
            }
            catch { }
        }

        public static byte[] SendBytes(byte[] addData, int Command, byte SubnetID, byte DeviceID)
        {
            try
            {
                var bytes = new byte[16 + 11 + addData.Length];

                bytes[0] = 192;
                bytes[1] = 168;
                bytes[2] = 10;
                bytes[3] = 1;
                bytes[4] = 72;//H
                bytes[5] = 68;//D
                bytes[6] = 76;//L
                bytes[7] = 77;//M
                bytes[8] = 73;//I
                bytes[9] = 82;//R
                bytes[10] = 65;//A
                bytes[11] = 67;//C
                bytes[12] = 76;//L
                bytes[13] = 69;//E

                bytes[14] = 0xAA;//引导码2位,0xAAAA固定
                bytes[15] = 0xAA;

                bytes[16] = (byte)(11 + addData.Length);//数据包长度
                bytes[17] = SubnetID; //源子网地址 0-254
                bytes[18] = DeviceID;//源设备地址 0-254
                                     //源设备类型2位
                bytes[19] = (byte)(0xFFFC / 256);
                bytes[20] = (byte)(0xFFFC % 256);
                //操作码
                bytes[21] = (byte)(Command / 256);
                bytes[22] = (byte)(Command % 256);
                //目标子网地址 0-254
                bytes[23] = 255;
                //目标设备地址 0-254
                bytes[24] = 255;

                Array.Copy(addData, 0, bytes, 25, addData.Length);

                //CRC校验位
                bytes[bytes.Length - 2] = 0;
                bytes[bytes.Length - 1] = 0;

                ConCRC(ref bytes, 16, bytes.Length - 2);

                return bytes;
            }
            catch
            {
                return null;
            }
        }

        /// <summary>
        /// 添加CRC校验字
        /// </summary>
        /// <param name="bufin">信息串</param>
        /// <param name="n">不包括校验字的串总长度</param>
        public static void ConCRC(ref byte[] bufin, byte start, int n)
        {
            ushort crc16 = 0;
            byte i;
            //n个数据的CRC校验
            for (i = start; i < n; i++)
            {
                crc16 = xcrc(crc16, bufin[i]);
            }
            bufin[i] = (byte)(crc16 >> 8);
            bufin[i + 1] = (byte)(crc16 & 0xff);
        }

        /// <summary>
        /// CRC校验公式
        /// </summary>
        /// <param name="crc">CRC</param>
        /// <param name="cp">发送的数据序列</param>
        /// <returns>新CRC</returns>
        private static ushort xcrc(ushort crc, byte cp)
        {
            ushort t1 = 0, t2 = 0, t3 = 0, t4 = 0, t5 = 0, t6 = 0;
            t1 = (ushort)(crc >> 8);
            t2 = (ushort)(t1 & 0xff);
            t3 = (ushort)(cp & 0xff);
            t4 = (ushort)(crc << 8);
            t5 = (ushort)(t2 ^ t3);
            t6 = (ushort)(crctab[t5] ^ t4);
            return t6;
        }

        #region crctab
        private static ushort[] crctab = new ushort[256]
        {
            0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
            0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
            0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
            0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
            0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
            0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
            0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
            0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
            0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
            0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
            0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
            0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
            0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
            0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
            0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
            0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
            0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
            0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
            0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
            0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
            0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
            0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
            0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
            0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
            0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
            0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
            0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
            0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
            0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
            0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
            0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
            0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
        };
        #endregion
    }
}