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

namespace STcpHelper.Packet
{
    /// <summary>
    /// 4byte header
    /// </summary>
    public class STcpPacketHeader : ISTcpPacket
    {
        private readonly int TYPE_LENGTH = 4;
        public static readonly int HEADER_LENGTH = 8;

        public PacketType Type { get; private set; }
        public int DataLength { get; private set; }

        public STcpPacketHeader(PacketType type, int dataLength)
        {
            Type = type;
            DataLength = dataLength;
        }

        public STcpPacketHeader(byte[] buffer)
        {
            int cursor = 0;
            this.Type = (PacketType)SBufferHelper.ConvertBufferToDataLength(buffer, cursor);
            cursor += TYPE_LENGTH;

            this.DataLength = SBufferHelper.ConvertBufferToDataLength(buffer, cursor);
        }

        public byte[] Serialize()
        {

            byte[] type = SBufferHelper.ConvertPacketTypeToBuffer(this.Type);
            byte[] dataLength = SBufferHelper.ConvertDataLengthToBuffer(this.DataLength);

            return SBufferHelper.GetBuffer(HEADER_LENGTH, type, dataLength);
        }

        public static int GetDataSize(params byte[][] data)
        {
            int size = 0;
            for (int i = 0; i < data.Length; i++)
            {
                size += data[i].Length;
            }

            return size;
        }
    }
}