using System;
using System.Linq;
using System.Net.Sockets;
using System.Text;
using Newtonsoft.Json;

namespace Server
{
    class Client
    {
        private Communication communication;
        private TcpClient tcpClient;
        private NetworkStream stream;
        private byte[] buffer = new byte[1024];
        private byte[] totalBuffer = new byte[1024];
        private int bytesReceived;
        private int totalBufferReceived = 0;


        public string Username { get; set; }

        public Client(Communication communication, TcpClient tcpClient)
        {
            this.communication = communication;
            this.tcpClient = tcpClient;
            this.stream = this.tcpClient.GetStream();
            stream.BeginRead(buffer, 0, buffer.Length, new AsyncCallback(OnRead), null);
        }

        private void OnRead(IAsyncResult ar)
        {
            int receivedBytes = this.stream.EndRead(ar);
            byte[] lengthBytes = new byte[4];

            if (totalBufferReceived + receivedBytes > 1024)
            {
                throw new OutOfMemoryException("buffer too small");
            }
            Array.Copy(buffer, 0, totalBuffer, totalBufferReceived, receivedBytes);
            totalBufferReceived += receivedBytes;


            int expectedMessageLength = BitConverter.ToInt32(totalBuffer, 0);
            while (totalBufferReceived >= expectedMessageLength)
            {
                //volledig packet binnen
                byte[] packetBytes = new byte[expectedMessageLength];
                Array.Copy(totalBuffer, 6, packetBytes, 0, expectedMessageLength - 6);


                Console.WriteLine(Encoding.ASCII.GetString(packetBytes) + " " + expectedMessageLength);



                Array.Copy(totalBuffer, expectedMessageLength, totalBuffer, 0, (totalBufferReceived - expectedMessageLength));
                totalBufferReceived -= expectedMessageLength;
                expectedMessageLength = BitConverter.ToInt32(totalBuffer, 0);
            }

            /*

            Array.Copy(this.buffer, 0, lengthBytes, 0, 4);

            int expectedMessageLength = BitConverter.ToInt32(lengthBytes);

            if (expectedMessageLength > this.buffer.Length)
            {
                throw new OutOfMemoryException("buffer to small");
            }

            if (expectedMessageLength > this.bytesReceived + receivedBytes)
            {
                //message hasn't completely arrived yet
                this.bytesReceived += receivedBytes;
                Console.WriteLine("segmented message, {0} arrived", receivedBytes);
                this.stream.BeginRead(this.buffer, this.bytesReceived, this.buffer.Length - this.bytesReceived, new AsyncCallback(OnRead), null);

            }
            else
            {
                //message completely arrived
                if (expectedMessageLength != this.bytesReceived + receivedBytes)
                {
                    Console.WriteLine("something has gone completely wrong");
                    Console.WriteLine($"expected: {expectedMessageLength} bytesReceive: {bytesReceived} receivedBytes: {receivedBytes}");
                    Console.WriteLine($"received WEIRD data {BitConverter.ToString(buffer.Take(receivedBytes).ToArray())} string {Encoding.ASCII.GetString(buffer.Take(receivedBytes).ToArray())}");

                }
                else if (buffer[4] == 0x02)
                {
                    Console.WriteLine($"received raw data {BitConverter.ToString(buffer.Skip(5).Take(expectedMessageLength).ToArray())}");
                }
                else if (buffer[4] == 0x01)
                {
                    byte[] packet = new byte[expectedMessageLength];
                    Console.WriteLine(Encoding.ASCII.GetString(buffer) + " " + expectedMessageLength);
                    Array.Copy(buffer, 5, packet, 0, expectedMessageLength - 5);
                    Console.WriteLine(Encoding.ASCII.GetString(packet));
                    HandleData(Encoding.ASCII.GetString(packet));
                }
                this.bytesReceived = 0;

            }
            */
            this.stream.BeginRead(this.buffer, 0, this.buffer.Length, new AsyncCallback(OnRead), null);

        }

        private void HandleData(string packet)
        {
            Console.WriteLine("Data " + packet);
            JsonConvert.DeserializeObject(packet);
        }
    }
}