///
/// Copyright (c) 2013-2015 Sensus Metering Systems
///
using System;
using log4net;

namespace TBF.BenchControl.Elde
{
	public class StartMeasurementOp : IOperation
	{
		private static readonly ILog log = LogManager.GetLogger(typeof(StartMeasurementOp));
        public override string ToString() { return string.Format("StartMeasurementOp(ref={0},pulses={1})", flowMeterNr, refPulses); }

		/// Set by the constructor
		readonly ControlBoardDev controlBoard;
		readonly Elde.RegulValve.RegulValve regulValve;
		readonly int regulValveNr;
		readonly int flowMeterNr;
		readonly float nominalFlow;
		readonly float reqFlowLo;
		readonly float reqFlowHi;
		readonly float reqFlowAve;
		readonly float pidCoef;
		readonly int refPulses;                 /// Number of reference pulses for a complete test
        readonly TestMethods testMethod;
        readonly float filterConstant;
        readonly int diverterNr;

        bool started = false;

		///
		///  Internal states of this operation
		///
		enum OpState
		{
			StartingTest,
			TestStarted,
			ValveMoveToFlow,
			OpCompleted,
		}
		OpState opState;


        /// <summary>
        /// Starts the measurement.
        /// Events:  MeasurementStarted
        /// </summary>
        /// <param name="controlBoard">Control board component reference</param>
		/// <param name="outputPath">Specifies used components</param>
		/// <param name="method">Test method</param>
		/// <param name="refPulses">Test duration in number of reference flowmeter pulses</param>
		/// <param name="filterConstant">Specifies filter for watermeter pulses</param>
		public StartMeasurementOp(ControlBoardDev controlBoard, OutputPath outputPath, TestMethods method,
								  float requiredFlowLo, float requiredFlowHi,
								  int refPulses, float filterConstant)
        {
			if (controlBoard == null) throw new ArgumentNullException("controlBoardDev");
			this.controlBoard = controlBoard;

            if (outputPath.FlowMeter is Elde.FlowMeter.FlowMeter)
            {
				flowMeterNr = (outputPath.FlowMeter as Elde.FlowMeter.FlowMeter).Idx1;
            }
			else if (outputPath.FlowMeter is Elde.FlowMeterTwins.FlowMeter)
            {
                flowMeterNr = 0;
            }
            else
            {
                throw new ArgumentException("flowMeter is null or is not Elde");
            }

			regulValve = outputPath.RegulValve as Elde.RegulValve.RegulValve;
			if (regulValve == null) throw new ArgumentNullException("regValve is null or not Elde");
			regulValveNr = this.regulValve.Idx1;

			if (outputPath.Diverter is Elde.Diverter.Diverter)
            {
				diverterNr = (outputPath.Diverter as Elde.Diverter.Diverter).AdcNr - 4;
            }

			nominalFlow = outputPath.FlowMeter.NominalFlow;

			this.reqFlowLo = requiredFlowLo;
			this.reqFlowHi = requiredFlowHi;
			this.reqFlowAve = (reqFlowLo + reqFlowHi) / 2.0f;
			this.pidCoef = outputPath.PidCoef;

            this.refPulses = refPulses;
            this.testMethod = method;
            this.filterConstant = filterConstant;

			log.Debug(this.ToString());
        }

		/// <summary>Start this operation</summary>
		public void Start()
        {
			controlBoard.SyncRoute();
#if IPERLST || BADGER_VELKA_TRAT
			int flowMeterIdxAndDiv = flowMeterNr + 16 * diverterNr;
#else
			int flowMeterIdxAndDiv = flowMeterNr;
#endif

			controlBoard.SendCommand(Command.Start, flowMeterIdxAndDiv, controlBoard.Route,
									 refPulses, refPulses, testMethod,
                                     filterConstant, 20, 0, StopDevs.None);

			opState = OpState.StartingTest;
        }

		/// <summary>Run this operation</summary>
		/// <returns>
		///		Event.FlowInDone or Event.FlowOutDone
		/// </returns>
		public Event Run()
		{
			if (opState == OpState.StartingTest)
			{
				StatusP statusP = controlBoard.StatusP;
				log.DebugFormat("statusP = {0} {1} {2} {3}",
								(((ulong)statusP >> 48) & 0xFFFF).ToString("X4"),
								(((ulong)statusP >> 32) & 0xFFFF).ToString("X4"),
								(((ulong)statusP >> 16) & 0xFFFF).ToString("X4"),
								((ulong)statusP & 0xFFFF).ToString("X4"));

				if (0 != (statusP & StatusP.TestInProgress))
				{
					log.Info("Test started");
					opState = OpState.TestStarted;
				}

				return Event.None;
			}
			else if (opState == OpState.TestStarted)
			{
				///
				/// Done once, issues an appropriate ValveMove(...) command
				///
				if (reqFlowLo >= reqFlowHi || reqFlowLo > nominalFlow || reqFlowHi <= 0)
				{
					return Event.OpArgumentError;
				}

				log.InfoFormat("Run(): rv#={0} flowMtr#={1} TARGET: flowLo={2} flowHi={3}",
								regulValveNr, flowMeterNr, reqFlowLo, reqFlowHi);

				float freqLo = 2000.0f * reqFlowLo / nominalFlow;
				float freqHi = 2000.0f * reqFlowHi / nominalFlow;
				controlBoard.ValveMove(regulValveNr, RegulValveMode.TargetFrequency,
									   new float[2] { freqLo, freqHi },
									   regulValve.StableTime);

				opState = OpState.OpCompleted;
				return Event.None;
			}
			else if (opState == OpState.OpCompleted)
			{
				return Event.MeasurementStarted;
			}

			return Event.None;
		}

		/// <summary>Stop this operation</summary>
		public void Stop()
		{
		}
	}
}