using System;
using log4net;

namespace TBF.BenchControl.Elde.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, flowMeterNr); }

		/// Set by the constructor
		readonly ControlBoardDev controlBoard;
		readonly int flowMeterNr;
		readonly Event eventDone;
        FloatBox flow;

		/// <summary>
		/// Events:  FlowInDone, FlowOutDone or Error
		/// </summary>
		/// <param name="flowMeter">Flow meter reference</param>
		/// <param name="flow">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 FloatBox flow, Event eventDone)
        {
			if (flowMeter == null) throw new ArgumentNullException("flowMeter");
			this.controlBoard = flowMeter.ControlBoard;
			this.flowMeterNr = flowMeter.Position;
			this.eventDone = eventDone;
			this.flow = flow;

			log.Debug(this.ToString());
        }
        public ReadFlowOp(FlowMeter flowMeter, ref FloatBox 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 (flowMeterNr == (int)(controlBoard.StatusP & StatusP.RefFlowMeterMask))
			{
				flow.F = controlBoard.ReferenceFlow;
				return eventDone;
			}
			else
			{
				return Event.Error;
			}
		}

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