///
/// Copyright (c) 2021 Sensus Slovensko a.s.
///
using System;
namespace TBF.Rig.ControlBoard.Uni
{
    public class ScopeAnalyzerData
    {
        public const int MessageLen = 1033;
        public const byte MessageCode = (byte)'S';

        /// Scope analyzer data
        public int KonSc;
        public int ZacSc;

        ScopeAnalyzerData()
        {
        }

        /// <summary>
        /// Returns tru when receive data fit the message frame 
        /// </summary>
        /// <param name="rcvdData">Received data</param>
        /// <param name="cumulativeSums">Cumulative sums of received data bytes</param>
        /// <param name="rcvdBytesCount">Received bytes count</param>
        /// <param name="offset">Offset of the message</param>
        /// <returns>true when frame fits data</returns>
        public static bool FrameFitsData(byte[] rcvdData, int[] cumulativeSums, int rcvdBytesCount, int offset)
        {
            if (offset + MessageLen > rcvdBytesCount) return false;

            int checksum = cumulativeSums[offset + MessageLen - 3] - cumulativeSums[offset];

            return rcvdData[offset] == Const.STX &&
                   rcvdData[offset + 1] == 0x01 &&
                   rcvdData[offset + 2] == ((MessageLen - 5) & 0xFF) &&
                   rcvdData[offset + 3] == MessageCode &&
                   rcvdData[offset + MessageLen - 2] == (checksum & 0xFF) &&
                   rcvdData[offset + MessageLen - 1] == ((checksum >> 8) & 0xFF);
        }

        /// <summary>
        /// Proces received data
        /// </summary>
        /// <param name="rcvdData">Received data</param>
        /// <param name="offset">Offset of the message</param>
        public static ScopeAnalyzerData GetData(byte[] rcvdData, int offset)
        {
            var data = new ScopeAnalyzerData();

            data.KonSc = Convert.ToInt32(rcvdData[4]) + 256 * Convert.ToInt32(rcvdData[5]);
            data.ZacSc = Convert.ToInt32(rcvdData[6]) + 256 * Convert.ToInt32(rcvdData[7]);

            return data;
        }
    }
}