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

namespace STcpHelper.Packet
{
    public class STcpTextPacket : ISTcpPacket
    {
        public string Text { get; private set; }

        public STcpTextPacket(string text)
        {
            this.Text = text;
        }

        public STcpTextPacket(byte[] dataBuffer)
        {
            int cursor = 0;
            short textSize = IPAddress.NetworkToHostOrder(BitConverter.ToInt16(dataBuffer, cursor));
            cursor += sizeof(short);

            this.Text = Encoding.UTF8.GetString(dataBuffer, cursor, textSize);
        }

        public byte[] Serialize()
        {
            byte[] text = Encoding.UTF8.GetBytes(Text);
            byte[] textSize = BitConverter.GetBytes(IPAddress.HostToNetworkOrder((short)text.Length));

            // 4byte header
            STcpPacketHeader header = new STcpPacketHeader(PacketType.TEXT, text.Length + textSize.Length);

            // [2bytes text size][n bytes text]
            return SBufferHelper.GetBuffer(4 + textSize.Length + text.Length, header.Serialize(), textSize, text);
        }
    }
}