using System;
using System.Collections.Generic;
using System.Net.Sockets;
using System.Text;

using BS.Shared;

namespace BeWoChatServer
{
    public class Packet
    {
        public Socket         Socket             { get; set; }
        public int            ClientNumber       { get; set; }
        public string         ClientName         { get; set; }
        public long           SenderPersonOid    { get; set; }
        public long           RecipientPersonOid { get; set; }
        public DataIdentifier DataIdentifier     { get; set; }
        public string         ChatMessage        { get; set; }

        public byte[] DataBuffer = new byte[1024];

        public Packet(Socket pSocket, int pClientNumber, string pClientName, long pSenderPersonOid, long pRecipientPersonOid)
        {
            Socket             = pSocket;
            ClientNumber       = pClientNumber;
            ClientName         = pClientName;
            SenderPersonOid    = pSenderPersonOid;
            RecipientPersonOid = pRecipientPersonOid;
        }

        //                  0              4           8              12                20                   28
        // Description   -> |dataIdentifier|name length|message length|sender person oid|recipient person oid|    name   |    message   |
        // Size in bytes -> |       4      |     4     |       4      |        8        |          8         |name length|message length|
        public Packet(byte[] dataStream)
        {
            DataIdentifier = (DataIdentifier)BitConverter.ToInt32(dataStream, 0);

            var nameLength = BitConverter.ToInt32(dataStream, 4);

            var messageLength = BitConverter.ToInt32(dataStream, 8);

            SenderPersonOid = BitConverter.ToInt64(dataStream, 12);

            RecipientPersonOid = BitConverter.ToInt64(dataStream, 20);

            ClientName = nameLength > 0 ? Encoding.UTF8.GetString(dataStream, 28, nameLength) : null;

            ChatMessage = messageLength > 0 ? Encoding.UTF8.GetString(dataStream, 28 + nameLength, messageLength) : null;
        }

        public void GetData(string message)
        {
            //Aufbau Message:
            // die ersten fünf ";" ignorieren
            // SenderOid;RecipientOid;ClientNameLength;MessageLength;ChatDataIdentifier;ClientNameChatMessage

            //23;281;20;389;1; 5 Semikola

            var gesplittet = message.Split(';');

            SenderPersonOid = Convert.ToInt64(gesplittet[0]);
            RecipientPersonOid = Convert.ToInt64(gesplittet[1]);

            var chatNameLength = Convert.ToInt32(gesplittet[2]);
            var chatMessageLength = Convert.ToInt32(gesplittet[3]);

            var headerLength = gesplittet[0].Length + gesplittet[1].Length + gesplittet[2].Length + gesplittet[3].Length + 5;
            var actualMessage = message.Substring(headerLength - 1);

            ClientName = actualMessage.Substring(0, chatNameLength);
            ChatMessage = actualMessage.Substring(chatNameLength);
        }

        // Java kennt nur unsigned bytes (-127 bis 128)
        public byte[] GetDataStream()
        {
            var result = "";

            return Encoding.UTF8.GetBytes(result);
        }


    }
}