///
/// Copyright (c) 2020 Sensus Slovensko a.s.
///
using System;
using log4net;
using TBF.Boxes;

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

        /// Set by the constructor
        readonly GenericDevices.IDiverter div;
        readonly int delay;

        int startTime;

        /// <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 ReadDiverterStateOp(GenericDevices.IDiverter div, int delay)
        {
            this.div = div;
            if (div == null) throw new ArgumentNullException();

            this.delay = delay;

            log.Debug(this.ToString());
        }
        public ReadDiverterStateOp(GenericDevices.IDiverter div)
            : this(div, 0)
        {
        }

        /// <summary>Start this operation</summary>
        public void Start()
        {
            startTime = StateMachine.Time;
        }

        /// <summary>Run this operation</summary>
        /// <returns> Event.ToTank or Event.ToSink </returns>
        public Event Run()
        {
            if (StateMachine.Time - startTime <= delay)
            {
                return Event.None;
            }
            return div.State ? Event.ToTank : Event.ToSink;
        }

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