///
/// Copyright (c) 2017 Sensus Metering Systems
///
using System;
using log4net;
using TBF.Boxes;

namespace TBF.BenchControl.Elde
{
	public class ReadDiverterTransitionOp : IOperation
	{
        private static readonly ILog log = LogManager.GetLogger(typeof(ReadDiverterTransitionOp));
        public override string ToString()
        {
            return string.Format("ReadDiverterTransitionOp(.,{0},{1},{2},...)", div.Name, runsCountWhenSendingCmd, runsCountWhenReadingDiv);
        }

        const int SamplesCount = 240;       /// Should be less then or equal to 256
        float[] samples;                                            

		/// Set by the constructor
		readonly ControlBoardDev controlBoard;
        readonly GenericDevices.IDiverter div;
        readonly int runsCountWhenSendingCmd;
        readonly int runsCountWhenReadingDiv;
        readonly FloatBox transitionTimeSec;
        readonly Sequences.Statistics plotter;
        readonly int batchNr;
        readonly string testName;
        readonly int repetition;

        int counter;
        bool cmdSent = false;
        bool divRead = false;


        /// <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 ReadDiverterTransitionOp(ControlBoardDev controlBoard, GenericDevices.IDiverter div, int runsCountWhenSendingCmd, int runsCountWhenReadingDiv,
                                        FloatBox transitionTimeSec, Sequences.Statistics plotter, int batchNr, string testName, int repetition)
        {
			if (controlBoard == null) throw new ArgumentNullException("controlBoardDev");
            if (runsCountWhenSendingCmd < 0) throw new ArgumentNullException("runsCountWhenSendingCmd");
            if (runsCountWhenReadingDiv <= runsCountWhenSendingCmd) throw new ArgumentNullException("runsCountWhenReadingDiv");
            if (transitionTimeSec == null) throw new ArgumentNullException("transitionTimeSec");

			this.controlBoard = controlBoard;
            this.div = div;
            this.runsCountWhenSendingCmd = runsCountWhenSendingCmd;
            this.runsCountWhenReadingDiv = runsCountWhenReadingDiv;
            this.transitionTimeSec = transitionTimeSec;
            this.plotter = plotter;
            this.batchNr = batchNr;
            this.testName = testName;
            this.repetition = repetition;

            samples = new float[SamplesCount];

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

		/// <summary>Start this operation</summary>
		public void Start()
        {
            counter = 0;

            if (runsCountWhenSendingCmd == 0 && div.DiverterNr > 0)
            {
                SendCommand();
                log.DebugFormat("Start() ... Sending a command to read diverter {0}", div.Name);
            }

            if (plotter != null)
            {
                plotter.Start(batchNr, testName, repetition);
                log.DebugFormat("Start() ... plotter.Start({0}, {1}, {2})", batchNr, testName, repetition);
            }
        }

		/// <summary>Run this operation</summary>
		/// <returns>
		///		Event.FlowInDone or Event.FlowOutDone
		/// </returns>
		public Event Run()
		{
            counter++;

            if (counter == runsCountWhenSendingCmd && div.DiverterNr > 0)
            {
                SendCommand();
                log.DebugFormat("Run() ... Sending a command to read diverter {0}", div.Name);
            }
            else if (counter == runsCountWhenReadingDiv && div.DiverterNr > 0)
            {
                if (plotter == null)
                {
                    ReadDiverterTransitionTimes();
                    log.DebugFormat("Run() ... Reading diverter {0} transition times: {1}s", div.Name, transitionTimeSec.Val);
                }
                else
                {
                    log.DebugFormat("Run() ... Reading diverter {0} samples", div.Name);
                    for (int i = 0; i < SamplesCount; i++)
                    {
                        float oneSample = controlBoard.DivSamples(i, div.DiverterNr - 1);
                        samples[i] = oneSample;
                        plotter.Update(oneSample);
                    }
                    plotter.Stop();

                    log.DebugFormat("Run() ... Calculating diverter {0} transition times: {1}s", div.Name, transitionTimeSec.Val);
                    CalculateDiverterTransitionTimes();
                }
            }

            return Event.None;
		}

		/// <summary>Stop this operation</summary>
		public void Stop()
		{
            log.DebugFormat("Stop()");
        }

        void SendCommand()
        {
            controlBoard.SyncRoute();
            controlBoard.SendCommand(Command.ReadDivTransition, 0, controlBoard.Route, 0, 0, 0, 0, 0, 0, StopDevs.None);
            cmdSent = true;
        }

        /// <summary>
        /// Diverter transition time is read from the control board
        /// </summary>
        /// <returns>true (always)</returns>
        bool ReadDiverterTransitionTimes()
        {
            transitionTimeSec.Val = (float)controlBoard.DivTime(2) - (float)controlBoard.DivTime(1);
            return true;
        }

        /// <summary>
        /// Diverter transition time is calculated from ADC samples and threshold levels
        /// </summary>
        /// <returns>true when transition time calculated OK</returns>
        bool CalculateDiverterTransitionTimes()
        {
            bool startedRising = false;
            bool startedFalling = false;
            bool stopped = false;

            int transitionStartIdx = 0;
            int transitionEndIdx = 0;

            float level = samples[0];
            for (int i = 1; i < SamplesCount; i++)
            {
                if (!startedRising && !startedFalling)
                {
                    if (level <= div.ThresholdLo && samples[i] > div.ThresholdLo)
                    {
                        transitionStartIdx = i;
                        startedRising = true;
                    }
                    else if (level >= div.ThresholdHi && samples[i] < div.ThresholdHi)
                    {
                        transitionStartIdx = i;
                        startedFalling = true;
                    }
                }
                else if (startedRising && !stopped && level < div.ThresholdHi && samples[i] >= div.ThresholdHi)
                {
                    transitionEndIdx = i;
                    stopped = true;
                    break;
                }
                else if (startedFalling && !stopped && level > div.ThresholdLo && samples[i] <= div.ThresholdLo)
                {
                    transitionEndIdx = i;
                    stopped = true;
                    break;
                }
            }

            if ((startedRising || startedFalling) && stopped)
            {
                transitionTimeSec.Val = 0.002f * (float)(transitionEndIdx - transitionStartIdx);    /// 2 ms per sample
                return true;
            }
            else
            {
                return false;
            }
        }
    }
}