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 string CheckSum { get; set; }
        string checkSum = string.Empty;

        public IList<string> ViaRouteList { get; set; }

        public OCSMessage()
        {
            this.ViaRouteList = new List<string>();
        }

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

        public int SubCodeToInt()
        {
            int result = 0;

            if ( string.IsNullOrEmpty( this.SubCode ) )
            {
                StringBuilder sb = new StringBuilder();
                sb.Append( this.IsSubCode1 ? "1" : "0" );
                sb.Append( this.IsSubCode2 ? "1" : "0" );
                sb.Append( this.IsSubCode3 ? "1" : "0" );

                int.TryParse( sb.ToString(), out result );
            }
            else
                int.TryParse( this.SubCode, out result );

            return result;
        }

        string MakeSubcode()
        {
            if ( !string.IsNullOrEmpty( this.SubCode ) )
            {
                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() );

            if ( this.Kind == eKind.M)
            {
                var viaCountj = this.ViaRouteList.Count.ToString( "0000" );
                foreach(var item in this.ViaRouteList )
                {
                    mb.AppendAscii( item );
                }
            }

            this.CheckSum = Convert.ToString( GetCheckSum( mb.ToBytes ), 16 ).ToLower();
            mb.AppendAscii( this.CheckSum );
            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() );

            //string checkSum = Convert.ToString( GetCheckSum( mb.ToBytes ), 16 ).ToLower();

            return GetCheckSum( mb.ToBytes );
        }

        byte GetCheckSum( byte[] bs )
        {
            byte rb = 0;
            foreach ( var item in bs )
            {
                if ( item == STX ) continue;
                rb += item;
            }
            return (byte)( rb & 0xf ); //&0xff 수정.
        }
    }
}