///
/// Copyright (c) 2019 Sensus Slovensko a.s.
///
using System;
using System.Collections.Generic;
using log4net;
using TBF.Boxes;
using TBF.BenchControl.GenericDevices;

namespace TBF.BenchControl.Elde.FlowMeterDewa
{
	public class FlowMeter : ComponentBase, IFlowMeter
	{
		private static readonly ILog log = LogManager.GetLogger(typeof(FlowMeter));
        public override string ToString() { return string.Format("FlowMeter({0})", Cfg.ToString(1)); }

		readonly FlowMeterCfg flowMeterCfg;
        readonly ControlBoardDev controlBoard;
        readonly IFlowMeter flowMeter1;
        readonly IFlowMeter flowMeter2;
        readonly IFlowMeter flowMeter3;
        readonly double nominalFlow;
        readonly double ltrPerPulse;
        readonly int flowMetersCount;
        readonly int flowMetersBitfield;

        public int Idx1 { get { return flowMetersBitfield; } }
        public double NominalFlow { get { return nominalFlow; } }
        public double LtrPerPulse { get { return ltrPerPulse; } }

        double[] refFreq;

        public double LtrPerPulseCorrected(double flow, int rangeIx)
        {
            if (flow < 0.1 * NominalFlow) return LtrPerPulse;     /// No correction for small flow

            refFreq[0] = controlBoard.ReferenceFreqs(0);
            refFreq[2] = controlBoard.ReferenceFreqs(2);
            refFreq[3] = controlBoard.ReferenceFreqs(3);
            refFreq[1] = refFreq[0] - refFreq[2] - refFreq[3];

            double ltrPerPulseCorrected = 0;
            if (flowMeter1 != null) ltrPerPulseCorrected += refFreq[1] * flowMeter1.LtrPerPulseCorrected(flow * refFreq[1] / refFreq[0], rangeIx);
            if (flowMeter2 != null) ltrPerPulseCorrected += refFreq[2] * flowMeter2.LtrPerPulseCorrected(flow * refFreq[2] / refFreq[0], rangeIx);
            if (flowMeter3 != null) ltrPerPulseCorrected += refFreq[3] * flowMeter3.LtrPerPulseCorrected(flow * refFreq[3] / refFreq[0], rangeIx);
            return ltrPerPulseCorrected / refFreq[0];
        }


        public bool RangeEnabled(int ix) { return flowMeterCfg.RangeEnabled(ix); }
        public double GetTempLo(int ix) { return flowMeterCfg.GetTempLo(ix); }
        public double GetTempHi(int ix) { return flowMeterCfg.GetTempHi(ix); }
        public double GetPressLo(int ix) { return flowMeterCfg.GetPressLo(ix); }
        public double GetPressHi(int ix) { return flowMeterCfg.GetPressHi(ix); }


		public FlowMeter()
		{
		}

		public FlowMeter(Generic.IComponentCfg cfg, IList<Generic.IComponent> components)
			: base(cfg)
		{
			flowMeterCfg = cfg as FlowMeterCfg;

			controlBoard = (ControlBoardDev)TbfComponents.FindComponent(cfg.ParentName, components);
			if (controlBoard == null) throw new Exception("Cannot find " + Name + " parent");

            if (!string.IsNullOrEmpty(flowMeterCfg.Flowmeter1)) flowMeter1 = TbfComponents.FindComponent(flowMeterCfg.Flowmeter1, components) as IFlowMeter;
            if (!string.IsNullOrEmpty(flowMeterCfg.Flowmeter2)) flowMeter2 = TbfComponents.FindComponent(flowMeterCfg.Flowmeter2, components) as IFlowMeter;
            if (!string.IsNullOrEmpty(flowMeterCfg.Flowmeter3)) flowMeter3 = TbfComponents.FindComponent(flowMeterCfg.Flowmeter3, components) as IFlowMeter;

            nominalFlow = 0;
            flowMetersCount = 0;
            flowMetersBitfield = 0;
            if (flowMeter1 != null) { nominalFlow += flowMeter1.NominalFlow; flowMetersBitfield |= (8 << flowMeter1.Idx1); flowMetersCount++; }
            if (flowMeter2 != null) { nominalFlow += flowMeter2.NominalFlow; flowMetersBitfield |= (8 << flowMeter2.Idx1); flowMetersCount++; }
            if (flowMeter3 != null) { nominalFlow += flowMeter3.NominalFlow; flowMetersBitfield |= (8 << flowMeter3.Idx1); flowMetersCount++; }
            if (flowMetersCount == 0) throw new Exception("Missing flowmeters");
            ltrPerPulse = nominalFlow / (flowMetersCount * 7200.0);     /// Nominal freq. is flowMetersCount * 2000 Hz (2000, 4000 or 6000 Hz)

            refFreq = new double[4];

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

        public double ReadFlow()      { return controlBoard.ReferenceFlow; }
        public double ReadFrequency() { return controlBoard.ReferenceFreq; }

		/// <summary>
		/// Events:  FlowDone, Error
		/// </summary>
		/// <param name="flow">Reference to a variable for the flow in Bar</param>
		/// <returns>ReadFlowOp instance reference casted to IOperaton</returns>
		public IOperation ReadFlowOp(ref DoubleBox flow)
		{
			return new ReadFlowOp(this, controlBoard, ref flow);
		}

		/// <summary>
		/// Events:  flowDone, Error
		/// </summary>
		/// <param name="flow">Reference to a variable for the flow in Bar</param>
		/// <param name="flowDone">Event returned when measurement done</param>
		/// <returns>ReadFlowOp instance reference casted to IOperaton</returns>
		public IOperation ReadFlowOp(ref DoubleBox flow, Event flowDone)
		{
			return new ReadFlowOp(this, controlBoard, ref flow, flowDone);
		}
	}
}