using System;
using System.Collections.Generic;
using log4net;
using TBF.Boxes;

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

		readonly FlowMeterCfg flowMeterCfg;

        public int Idx1 { get { return 0; } }

        public readonly ControlBoardDev ControlBoard;
        public readonly TBF.BenchControl.Elde.FlowMeter.FlowMeter FlowMeter1;
        public readonly TBF.BenchControl.Elde.FlowMeter.FlowMeter FlowMeter2;

        public float NominalFlow { get { return flowMeterCfg.NominalFlow; } }

        /// The nominal flowed of a pair of flow meters is reached at 4000Hz
        public float LtrPerPulse { get { return flowMeterCfg.NominalFlow / 14400.0f; } }

        /// Calculates the average of values of two flowmeters. Assumes the flow is divided evenly. 
        public float LtrPerPulseCorrected(float flow)
        {
            float flow2 = flow / 2;
            return (FlowMeter1.LtrPerPulseCorrected(flow2) + FlowMeter2.LtrPerPulseCorrected(flow2)) / 2;
        }
        

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

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

            FlowMeter1 = (TBF.BenchControl.Elde.FlowMeter.FlowMeter)TbfComponents.FindComponent(flowMeterCfg.FlowMeter1, components);
            if (FlowMeter1 == null) throw new Exception("Cannot find FlowMeter1 component");

            FlowMeter2 = (TBF.BenchControl.Elde.FlowMeter.FlowMeter)TbfComponents.FindComponent(flowMeterCfg.FlowMeter2, components);
            if (FlowMeter2 == null) throw new Exception("Cannot find FlowMeter2 component");

            ControlBoard.EtCalib[Idx1] = flowMeterCfg.NominalFlow;

			/// Prepare data for SendCalibData() control board component method

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

		/// <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 FloatBox flow)
		{
			return new ReadFlowOp(this, 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 FloatBox flow, Event flowDone)
		{
			return new ReadFlowOp(this, ref flow, flowDone);
		}
	}
}