using System;
using System.Diagnostics;
using System.Globalization;
using System.Net.Sockets;
using System.Text;

using BS.Shared;

namespace BeWoChatServer
{
    public class Packet
    {
        // Fehlercodes zwischen 1500 und 1999
        public Socket         Socket             { 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 DateTime       MessageTimeStamp   { get; set; }
        public string         Tenant             { get; set; }

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

        //Aufbau Message:
        // die ersten fünf ";" ignorieren
        // SenderOid;RecipientOid;ClientNameLength;MessageLength;ChatDataIdentifier;Tenant;[ClientName][ChatMessage][MessageTimeStamp]

        //23;281;20;389;1;[Tenant]; 6 Semikola

        public Packet(Socket pSocket, string pClientName, long pSenderPersonOid, long pRecipientPersonOid)
        {
            Socket             = pSocket;
            ClientName         = pClientName;
            SenderPersonOid    = pSenderPersonOid;
            RecipientPersonOid = pRecipientPersonOid;
            MessageTimeStamp   = DateTime.Now;
            ChatMessage        = "";
            Tenant             = "";
        }

        public void GetData(string message)
        {
            Debug.WriteLine("Nachricht: " + message);

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

                var senderPersonOidString    = gesplittet[0];
                var recipientPersonOidString = gesplittet[1];
                var chatNameLengthString     = gesplittet[2];
                var chatMessageLengthString  = gesplittet[3];
                var chatIdentifierString     = gesplittet[4]; 
                Tenant                       = gesplittet[5];

                DataIdentifier = (DataIdentifier) Convert.ToInt32(chatIdentifierString);

                SenderPersonOid = Convert.ToInt64(senderPersonOidString);
                RecipientPersonOid = Convert.ToInt64(recipientPersonOidString);

                var chatNameLength = Convert.ToInt32(chatNameLengthString);
                var chatMessageLength = Convert.ToInt32(chatMessageLengthString);

                var headerLength = senderPersonOidString.Length + recipientPersonOidString.Length + chatNameLengthString.Length + chatMessageLengthString.Length + chatIdentifierString.Length + Tenant.Length + 7;
                var actualMessage = message.Substring(headerLength - 1);

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

                var dateString = actualMessage.Substring(chatMessageLength + chatNameLength);

                MessageTimeStamp = DateTime.ParseExact(dateString, "dd.MM.yyyy HH:mm:ss", CultureInfo.InvariantCulture);
            }
            catch(Exception exception)
            {
                Debug.WriteLine("Error 1500: " + exception.Message);
            }
        }

        public byte[] GetDataStream()
        {
            var result = "";

            result += SenderPersonOid + ";" + RecipientPersonOid + ";" + ClientName.Length + ";" + ChatMessage.Length + ";" + (int) DataIdentifier + ";" + Tenant + ";" + ClientName + ChatMessage + DateTime.Now.ToString("dd.MM.yyyy HH:mm:ss");

            return Encoding.UTF8.GetBytes(result);
        }
    }
}