using System;
using System.Globalization;

namespace TBF.BenchControl.WaterMeters.iPerl
{
	public class OptoTelegramRaw
	{
		public static readonly int Length = 42;
		private static CultureInfo culture;


        ///
        /// Strobed value
        ///
        public static decimal TestStartTimestampDec;

		
		///
		/// Stored values
		///
		public OptoTelegramFlags Flags;

		public DateTime DateTime;		/// From PC
		public float RefFlow;			/// [m3/h]
		public int Counter;				

		public UInt32 EmfRaw;			/// From iPerl opto data
		public Int16 MagneticFieldRaw;
		public Int16 FlowRaw;
		public Int32 VolumeRaw;
		public Int16 Impedance;
		public Int64 Timestamp;
		public byte CheckSum;

		///
		/// Calculated values
		///
		public double EMF()
		{
			Int32 signedEmf = (EmfRaw > 0x7FFFFF) ? ((int)EmfRaw - 0x1000000) : (int)EmfRaw;
			return 0.000000333 * (double)signedEmf;
		}
		public double MagneticField() { return (double)MagneticFieldRaw; }
		public double Flow(double scalingFactor) { return 0.225 * scalingFactor * (double)FlowRaw; }
		public double Volume(double scalingFactor) { return 0.0000625 * scalingFactor * (double)VolumeRaw; }
		public Int32 FlipTime() { return Impedance; }
		public decimal TimestampDec() { return (decimal)Timestamp / (decimal)8192; }
		public double VolumeDelta(double scalingFactor, OptoTelegramRaw previous) { return (previous == null) ? 0 : Volume(scalingFactor) - previous.Volume(scalingFactor); }
        public decimal TimeDelta() { return TimestampDec() - TestStartTimestampDec; }
		public string Label()
		{
			if (Flags == OptoTelegramFlags.OK_TestStart) return "#### start test ####";
			else if (Flags == OptoTelegramFlags.OK_TestEnd) return "#### end of test ####";
			else return string.Empty;
		}


		static OptoTelegramRaw()
		{
			culture = CultureInfo.CreateSpecificCulture("DE");		/// This is to use comma as decimal number separator
		}

		public OptoTelegramRaw()
		{
		}

        /// <summary>
        /// Parses optical telegram and returns OptoTelegramRaw object
        /// </summary>
        /// <description>
        /// Create a configuration structure from a complete byte array
		/// 
		/// Telegram description:
		/// 
		/// AAAAAA[tab]BBBB[tab]CCCC[tab]DDDDDD[tab]EEEE[tab]FFFFFFFF[tab]GG[cr][lf]  (42 bytes)
		/// 
		/// Data     Comment         Type     Calculate to decimal
		/// ----------------------------------------------------------------
		/// AAAAAA   EMF             Int24    Value * 0.000000333
		/// BBBB     Magnetic field  Int16    Value
		/// CCCC     Flow            Int16    Value * 0.225 * Scalig factor
		/// DDDDDD   Volume          Int24    Value / 16000 * Scaling factor
		/// EEEE     Impedance       Int16    Value
		/// FFFFFFFF Timestamp       Uint32   Value / 8192
		/// GG       Checksum        Byte
		/// ----------------------------------------------------------------
		/// 
		/// Example:
		/// FFFFFE	51EA	0000	65324E	0087	F6319DFF	86
		/// FFDD3A	51F9	0000	65324E	0088	F631A60B	45
		/// ...
        /// </description>
        /// <param name="data">A complete byte array data</param>
        /// <returns>ConfigStruct or null when byte array was not complete</returns>
		public bool UpdateFromString(string telegram, int counter)
		{
			DateTime = DateTime.Now;
			Counter = counter;
			RefFlow = Sequences.ProcessData.RefFlow.Val;

			if ((telegram == null) || (telegram.Length < Length) ||
				(telegram[6]  != '\t') || (telegram[11] != '\t') || (telegram[16] != '\t') ||
				(telegram[23] != '\t') || (telegram[28] != '\t') || (telegram[37] != '\t') ||
				(telegram[40] != '\r') || (telegram[41] != '\n'))
			{
				return false;
			}

			bool f1 = UInt32.TryParse(telegram.Substring(0, 6), NumberStyles.HexNumber, CultureInfo.CurrentCulture, out EmfRaw);
			bool f2 = Int16.TryParse(telegram.Substring(7, 4), NumberStyles.HexNumber, CultureInfo.CurrentCulture, out MagneticFieldRaw);
			bool f3 = Int16.TryParse(telegram.Substring(12, 4), NumberStyles.HexNumber, CultureInfo.CurrentCulture, out FlowRaw);
			bool f4 = Int32.TryParse(telegram.Substring(17, 6), NumberStyles.HexNumber, CultureInfo.CurrentCulture, out VolumeRaw);
			bool f5 = Int16.TryParse(telegram.Substring(24, 4), NumberStyles.HexNumber, CultureInfo.CurrentCulture, out Impedance);
			bool f6 = Int64.TryParse(telegram.Substring(29, 8), NumberStyles.HexNumber, CultureInfo.CurrentCulture, out Timestamp);
			bool f7 = byte.TryParse(telegram.Substring(38, 2), NumberStyles.HexNumber, CultureInfo.CurrentCulture, out CheckSum);

			return f1 && f2 && f3 && f4 && f5 && f6 && f7;
		}


		public static OptoTelegramRaw FromString(string telegram, int counter)
		{
			OptoTelegramRaw opto = new OptoTelegramRaw();

			if (opto.UpdateFromString(telegram, counter))
			{
				return opto;
			}
			else
			{
				return null;
			}
		}


		public void SetFlags(OptoTelegramFlags flags)
		{
			this.Flags = flags;
		}


		public string ToString(double scalingFactor, OptoTelegramRaw previous)
		{
			if (Flags == OptoTelegramFlags.SyncError)
			{
				return "Sychronization error";
			}
			else if (Flags == OptoTelegramFlags.InvalidTelegram)
			{
				return "Invalid telegram";
			}
			else /// if (flags == OptoTelegramFlags.OK / OptoTelegramFlags.OK_TestStart / OptoTelegramFlags.OK_TestEnd)
			{
				return string.Format("{0}:{1}:{2}.{3}\t{4} :\t{5}\t{6}\t{7}\t{8}\t{9}\t{10}\t{11}\t{12}\t{13}\t{14}\t{15}\t{16}\t{17}\t{18}\t{19}\t{20}\t{21}\t{22}",
									DateTime.Hour.ToString("D2"),
									DateTime.Minute.ToString("D2"),
									DateTime.Second.ToString("D2"),
									DateTime.Millisecond.ToString("D4"),
									Counter,
									EmfRaw.ToString("X6"),
									MagneticFieldRaw.ToString("X4"),
									FlowRaw.ToString("X4"),
									VolumeRaw.ToString("X6"),
									Impedance.ToString("X4"),
									Timestamp.ToString("X8"),
									CheckSum.ToString("X2"),
									EMF().ToString("F4", culture),
									MagneticField().ToString("F0", culture),
									Flow(scalingFactor).ToString("F2", culture),
									Volume(scalingFactor).ToString("F4", culture),
									FlipTime().ToString("F0", culture),
									TimestampDec().ToString("F4", culture),
									(RefFlow * 1000).ToString("F2", culture),
									VolumeDelta(scalingFactor, previous).ToString("F4", culture),
									TimeDelta().ToString("F3", culture),
									scalingFactor.ToString("F1", culture),
									Label());
			}
		}

		/// <summary>
		/// Filter RefFlow data in an array of OptoTelegramRaw objects by a FIR filter:
		/// 
		/// kSize = 5, kSize2 = 2
		/// 
		///  i  k
		///  ---------------------------------------------------------------------------
		///  0 -5                        filtered[0] = data[0]
		///  1 -4                        filtered[1] = data[1]
		///  2 -3                        filtered[2] = data[0]*k[0] + ... + data[4]*k[4]
		///  3 -2                        filtered[3] = data[1]*k[0] + ... + data[5]*k[4]
		///  4 -1                        filtered[4] = data[2]*k[0] + ... + data[6]*k[4]
		///  5  0 data[0] = filtered[0], filtered[0] = data[3]*k[0] + ... + data[7]*k[4]
		///  6  1 data[1] = filtered[1], filtered[1] = data[4]*k[0] + ... + data[8]*k[4]
		///  7    ...
		/// </summary>
		/// <param name="optoData">array of OptoTelegramRaw objects</param>
		/// <param name="optoDataCount">number of objects to process</param>
		public static void FIRFilterFlow(OptoTelegramRaw[] optoData, int optoDataCount)
		{
			float[] kernel = new float[] { 0.1f, 0.2f, 0.4f, 0.2f, 0.1f };
			int kSize = kernel.Length;
			int kSize2 = kernel.Length / 2;

			float[] filtered = new float[kSize];

			for (int i = 0; i < optoDataCount; i++)
			{
				int k = i - kSize;
				if (k >= 0) optoData[k].RefFlow = filtered[i % kSize];

				if (i < kSize2 || i >= optoDataCount - kSize2)
				{
					filtered[i % kSize] = optoData[i].RefFlow;
				}
				else
				{
					float weoightedSum = 0;
					for (int j = -kSize2; j <= kSize2; j++)
						weoightedSum += optoData[i + j].RefFlow * kernel[j + kSize2];

					filtered[i % kSize] = weoightedSum;
				}
			}

			for (int k = optoDataCount - kSize; k < optoDataCount; k++)
			{
				if (k >= 0) optoData[k].RefFlow = filtered[k % kSize];
			}
		}
	}
}