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

namespace TBF.BenchControl.Dummy.FlowMeter
{
	public class ReadFlowOp : IOperation
	{
		private static readonly ILog log = LogManager.GetLogger(typeof(ReadFlowOp));
		public override string ToString() { return string.Format("ReadFlowOp(.,{0},{1},.)", eventDone); }

		/// Set by the constructor
        readonly FlowMeter flowMeter;
        readonly DoubleBox flowBox;
        readonly Event eventDone;

		/// <summary>
		/// Events:  FlowInDone, FlowOutDone or Error
		/// </summary>
		/// <param name="flowMeter">Flow meter reference</param>
		/// <param name="flowBox">Reference to the measured flow variable, value is in bar</param>
		/// <param name="eventDone">Event to be returned by Run() when completed OK</param>
		public ReadFlowOp(FlowMeter flowMeter, ref DoubleBox flowBox, Event eventDone)
        {
			if (flowMeter == null) throw new ArgumentNullException("flowMeter");

            this.flowMeter = flowMeter;
			this.eventDone = eventDone;
			this.flowBox = flowBox;

			log.Debug(this.ToString());
        }
		public ReadFlowOp(FlowMeter flowMeter, ref DoubleBox flow)
			: this(flowMeter, ref flow, Event.FlowMeasurementDone)
		{
		}

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

		/// <summary>Run this operation</summary>
		/// <returns>
		///		Event.FlowInDone or Event.FlowOutDone
		/// </returns>
		public Event Run()
		{
            if (flowBox != null) flowBox.Val = flowMeter.ReadFlow();
			return eventDone;
		}

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