using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Core.ONH.Collection.Protocol;

namespace Core.ONH.Collection.Send
{
    /// <summary>
    /// 自定义串口通信协议
    /// </summary>
    public class CoreProtocol
    {

        /// <summary>
        ///   组帧  特定格式   0x68 + Len +  数据域(有效数据 + 2位有效数据的Crc16的校验)  + 0x68
        /// </summary>
        /// <param name="byteArray"></param>
        /// <returns></returns>
        public static byte[] Framing(byte[] byteArray)
        {
            byteArray = Crc16.GetCRC16Full(byteArray, true);

            byte[] fullyByte =
                new byte[] { 0x68 }.Concat(new[] { (byte)byteArray.Length }).Concat(byteArray).Concat(new byte[] { 0x68 }).ToArray();
            return fullyByte;
        }

        /// <summary>
        ///  解帧   检查数据帧是否有效正确   
        /// </summary>
        /// <param name="byteArray">数据帧</param>
        /// <param name="data">有效数据</param>
        /// <returns>据帧是否有效正确 </returns>
        public static DeframeType Deframe(List<byte> byteArray, out List<byte> data)
        {
            data = new List<byte>();
            try
            {
                if (byteArray == null || byteArray.Count<=0) return DeframeType.RightFrame;
                if (byteArray[0] != 0x68) return DeframeType.WrongHead;
                int len = byteArray[1];
                if (byteArray.Count < len + 2 + 1) return DeframeType.LengthLess;
                if (byteArray[1 + len + 1] != 0x68) return DeframeType.WrongHead;

                List<byte> dataArea = byteArray.Skip(2).Take(len).ToList();
                data = dataArea.Take(len - 2).ToList();

                if (!Crc16.CompareCrc(dataArea.Take(len-2).ToArray(), true, dataArea.Skip(len - 2).Take(2).ToArray())) return DeframeType.WrongFrame;


                return DeframeType.RightFrame;

            }
            catch (Exception)
            {
                return DeframeType.UnKnow;
            }
        }

    }

    public enum DeframeType
    {
        RightFrame =0,
        WrongHead = 1,
        LengthLess = 2,
        WrongFrame = 3,
        UnKnow
    }

}