// This demonstrates how to perform a graceful disconnect, where data sending/receiving
// is allowed to complete before the client is disconnected.
// In this demo the server begins the graceful disconnect process
// It is also possible for a client to initiate a graceful disconnect



using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;

namespace Client
{
    class Program
    {
        static void Main(string[] args)
        {
            // mnClientConnected return value constants
            const int C_NOT_CONNECTED = 0;
            const int C_CONNECTED = 1;
            const int C_NO_SEND = 2;
            const int C_NO_RECV = 3;
            const int C_NO_SEND_RECV = 4;

	        // Connect to server
	        int iReturn = 0;
	        Console.WriteLine("DarkNet version: " + mn.GetVersion());

	        Int64 RecvPacket = mn.CreatePacket();
	        Int64 SendPacket = mn.CreatePacket();
	        mn.SetMemorySize(SendPacket,1024);

	        mn.Start(1,0);
        	
	        mn.DisableUDP(0);
	        mn.EnableGracefulDisconnect(0);
	        iReturn = mn.Connect(0,"127.0.0.1",6565,"",0,5,true);
	        switch(iReturn)
	        {
		        case(1):
			        Console.WriteLine("Connected to server");
		        break;

		        case(0):
			        Console.WriteLine("Connection timed out");
			        Console.WriteLine("Press any key to exit...");
                    Console.ReadKey();
                    return;
		        break;

		        case(-1):
			        Console.WriteLine("An unknown error occurred whilst trying to connect");
			        Console.WriteLine("Press any key to exit...");
                    Console.ReadKey();
			        return;
		        break;

		        case(-2):
			        Console.WriteLine("The connection request was rejected because the server is full");
			        Console.WriteLine("Press any key to exit...");
                    Console.ReadKey();
			        return;
		        break;
	        }


	        // Main loop
	        int SendTimer = 0;
	        int SendFreq = 2000;

	        int iClientStatus;
	        do
	        {
		        // Use less CPU
		        Thread.Sleep(1);

		        iClientStatus = mn.ClientConnected(0,0);
		        switch(iClientStatus)
		        {
			        // Server has begun to gracefully disconnect us
			        // No further data can be received but we can use
			        // what has already been received, and is stored in
			        // the packet queue
			        case(C_NO_RECV):
				        Console.WriteLine("mn.ClientConnected: " + iClientStatus);

				        // Deal with data received and in packet queue
				        while(mn.RecvTCP(0,RecvPacket,0) > 0)
				        {
					        Console.WriteLine("Final TCP data received");
				        }

				        // Send final data
				        // When mn.SendTCP returns data has been sent
				        // and so cleanup after this will NOT cause the
				        // send to fail
				        mn.AddString(SendPacket,"Goodbye server, I will miss you!",0,true);
				        mn.SendTCP(0,SendPacket,0,false,true);

				        // Shutdown
				        // No further data can be sent
				        // mn.ClientConnected will use mn.DisconnectClient/mn.Finish
				        // to clean up the instance and will return 0, completing
				        // the disconnect process
				        mn.ShutdownClient(0,0);

				        Console.WriteLine("Received all data, sent final message to server and fully disconnected");
			        break;
		        }

		        if(iClientStatus == C_CONNECTED)
		        {
			        // TCP packets
			        iReturn = mn.RecvTCP(0,RecvPacket,0);
        		
			        if(iReturn > 0)
			        {
				        Console.WriteLine("New TCP packet received");
			        }

			        // Send messages every SendFreq ms
                    if ((System.DateTime.Now.Millisecond + (System.DateTime.Now.Second * 1000) + (System.DateTime.Now.Minute * 60 * 1000)) - SendTimer > SendFreq)
			        {
				        string str = System.DateTime.Now.Date + ", " + System.DateTime.Now.TimeOfDay;
        				
				        mn.AddString(SendPacket,str,0,true);

				        Console.WriteLine("String sent to server: " + str);

				        // Send packet
				        mn.SendTCP(0,SendPacket,0,false,true);

				        // Update timer
                        SendTimer = (System.DateTime.Now.Millisecond + (System.DateTime.Now.Second * 1000) + (System.DateTime.Now.Minute * 60 * 1000));
			        }
		        }
	        }while(iClientStatus != C_NOT_CONNECTED);

	        // Cleanup and exit
	        Console.WriteLine("Disconnected from server!");
	        Console.WriteLine("Press any key to exit...");
            Console.ReadKey();

	        mn.Finish(-1);
        }
    }
}