using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.Net.Sockets;
using SafeMobileLib;
using System.Threading;
using MotoTRBO_GW;

namespace MotoTrbo_GW
{
    class SMSThread
    {
        public UInt16 port;
        private byte[] data = new byte[1024];
        private UdpMulticast udpMulticast;
        private static UdpClient udpClient;
        private String mIP;
        private Int32 mPort;

        public SMSThread(UInt16 smsPort, String multicastID, String multicastPort)
        {
            port = smsPort;
            mIP = multicastID;
            mPort = Int32.Parse(multicastPort);
        }

        public void handleConnection()
        {
            Console.WriteLine("SMS Thread - Initialized on port " + port);

            udpClient = null;
            try
            {
                IPEndPoint ie;
                ie = new IPEndPoint(IPAddress.Any, port);
                udpClient = new UdpClient(ie);
            }
            catch (Exception ex)
            {
                Console.WriteLine("SMS Thread handleConnection exception: " + ex.ToString());
            }

            try
            {
                udpMulticast = new UdpMulticast(mIP, mPort);
                Console.WriteLine("SMS thread successfully registered to multicast group");
            }
            catch (Exception ex)
            {
                Console.WriteLine("SMS Thread exception while joining the multicast group: " + ex.ToString());
            }

            IPEndPoint remoteIpEndPoint = new IPEndPoint(IPAddress.Any, 0);

            while (true)
            {
                // Blocks until a message returns on this socket from a remote host.
                Byte[] receivedBytes = udpClient.Receive(ref remoteIpEndPoint);

                char[] separator = { '.' };
                string[] su = remoteIpEndPoint.Address.ToString().Split(separator);
                uint radioID = (Convert.ToUInt32(su[1])) * 256 * 256 + (Convert.ToUInt32(su[2])) * 256 + Convert.ToUInt32(su[3]);
                string suid = radioID.ToString();

                Console.Write("SMS Thread received data from radio " + radioID + ": ");
                Utils.printBytesArray(receivedBytes);

                header_T hret = DecodePacket(receivedBytes);

                if (hret.ack)
                {
                    Thread.Sleep(1000);
                    // The client needs an ACK
                    Byte[] sendBytes = new Byte[5];
                    sendBytes[0] = 0x00; // len (2B)
                    sendBytes[1] = 0x03;
                    sendBytes[2] = 0xBF; // first header (req)
                    sendBytes[3] = 0x00; // addr len
                    sendBytes[4] = hret.seq_no; // 2nd header (opt)
                    Console.WriteLine("SMS thread ACK sent: " + Utils.Byte2String(sendBytes, 0, sendBytes[1] + 2));
                    udpClient.Send(sendBytes, sendBytes[1] + 2, remoteIpEndPoint);
                }

                //put information on message bus
                Byte[] toSendMulticast = Utils.createMulticastMessage(132, suid, receivedBytes);
                udpMulticast.Send(toSendMulticast, toSendMulticast.Length);
                Console.WriteLine("SMS thread sent data to message bus");

                Thread.Sleep(1000);
            }
        }

        header_T DecodePacket(Byte[] data)
        {
            header_T hret = new header_T();
            int i, j, pdata;

            pdata = (int)data[0];
            pdata <<= 8;
            pdata |= (int)data[1];

            // parse header
            int header = data[2];
            hret.header = data[2];
            if ((header & 0x80) != 0)
                hret.ext = true;
            else hret.ext = false;

            if ((header & 0x40) != 0)
                hret.ack = true;
            else hret.ack = false;

            if ((header & 0x10) != 0)
                hret.cntl = true;
            else hret.cntl = false; // txt message

            hret.pdu_type = (byte)(header & 0x0f);

            // parse address
            int addrsize = data[3];
            i = 4;
            //Console.Write("Address: ");
            for (j = 0; j < addrsize; j++)
            {
                //Console.Write(data[i + j].ToString("X"));
            }
            i += j;

            // parse rest of headers
            if (hret.ext)
            {
                byte h2 = data[i];
                if ((h2 & 0x80) != 0)
                    hret.ext2 = true;
                else hret.ext2 = false;

                hret.seq_no = (byte)(h2 & 0x1F);
                i++;

                if (hret.ext2)
                { // parse third header
                    hret.encoding = (byte)(data[i] & 0x0f);
                    i++;
                }
            }

            int crc = 0;
            if ((!hret.cntl) && (hret.pdu_type == 0))
            { // the rest is the txt message
                Char[] cs = new Char[100];
                int k;
                for (j = i, k = 0; j < pdata + 2; j++)
                {
                    //Console.Write(" 0x" + data[j].ToString("X"));
                    if (data[j] != 0)
                    {
                        cs[k++] = (Char)data[j];
                        crc |= (Char)data[j];
                    }
                }
                Console.WriteLine();

                // save message in inbox ht
                string s = new string(cs, 0, k);
                s.Replace("\r\n", "");
                s = s.Replace(System.Environment.NewLine, string.Empty);
                Console.WriteLine("Message [" + s + "]");
            }
            return hret;
        }
    }
}