using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using GSG.NET.Utils;

namespace OHVConnector
{
    public enum eKind
    {
        Unknown, // Not Define
        E, //Error
        S, //State
        B, //Battery
        T, //
        C,
        P,
        I,//수동명령보고,응답
        O,
        A,//Alive Check
        L,
        U,
        F,
        M,//Move
        R,
        H,
        Z,
    }

    public class OCSMessage
    {
        const byte STX = 0x02;
        const byte ETX = 0x03;

        public string Id { get; set; }
        public eKind Kind { get; set; }

        //SubCode 만들기 위한 Bool
        public bool IsSubCode1 { get; set; } = false;
        public bool IsSubCode2 { get; set; } = false;
        public bool IsSubCode3 { get; set; } = false;

        public string RevID { get; set; }
        public string SendID { get; set; }
        public string Tag { get; set; }
        public string SubCode { get; set; }
        public byte CheckSum { get; set; }

        public OCSMessage()
        {
        }

        public string LogFormat()
        {
            return $"{this.Id} - {this.RevID} <- {this.SendID} : kind [{this.Kind.ToString()}] / Tag [{this.Tag}] / SubCode [{this.SubCode}]";
        }

        string MakeSubcode()
        {
            if ( this.Kind == eKind.A)
            {
                return this.SubCode;
            }
            else
            {
                StringBuilder sb = new StringBuilder();
                sb.Append(this.IsSubCode1 ? "1" : "0");
                sb.Append(this.IsSubCode2 ? "1" : "0");
                sb.Append(this.IsSubCode3 ? "1" : "0");

                return this.SubCode = sb.ToString();
            }
        }

        public MemoryBuffer ToMemoryBuffer()
        {
            var mb = new MemoryBuffer();
            mb.Append(STX);
            mb.AppendAscii(RevID);
            mb.AppendAscii(SendID);
            mb.AppendAscii(this.Kind.ToString());
            mb.AppendAscii(this.Tag);
            mb.AppendAscii(MakeSubcode());
            mb.Append(GetCheckSum(mb.ToBytes));
            mb.Append(ETX);

            return mb;
        }

        public byte GetCheckSum()
        {
            var mb = new MemoryBuffer(18);
            mb.Append(STX);
            mb.AppendAscii(RevID);
            mb.AppendAscii(SendID);
            mb.AppendAscii(this.Kind.ToString());
            mb.AppendAscii(this.Tag);
            mb.AppendAscii(MakeSubcode());

            return GetCheckSum(mb.ToBytes);
        }

        byte GetCheckSum(byte[] bs)
        {
            byte rb = 0;
            foreach( var item in bs)
            {
                rb += item;
            }
            return (byte)(rb & 0xff);
        }
    }
}