///
/// Copyright (c) 2013-2021 Sensus Slovensko a.s.
///
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using log4net;

namespace TBF.Rig.MettlerToledo.Standard
{
	public class SetUnitsOp : IOperation
	{
		private static readonly ILog log = LogManager.GetLogger(typeof(SetUnitsOp));
		public override string ToString() { return string.Format("SetUnitsOp({0})", units); }

		/// Set by the constructor
		BalanceDev scale;
		Common.Unit units;
        bool activityStarted;

		/// <summary>
		/// Events:  BalanceDone, Error
		/// </summary>
		/// <param name="scale">Balance device instance</param>
		/// <param name="result">Reference to the serialNumber</param>
		public SetUnitsOp(BalanceDev scale, Common.Unit units)
        {
			if (scale == null) throw new ArgumentNullException("balanceDev");
			this.scale = scale;
			this.units = units;

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

		/// <summary>Start this operation</summary>
		public void Start()
        {
			log.DebugFormat("{0} - SetUnitsOp - Start()", scale.Name);

            if (scale.Activity == Activity.Idle)
            {
                scale.SendSetUnitsCmd(units);
                activityStarted = true;
                scale.Activity = Activity.RunningOperation;
            }
            else
            {
                activityStarted = false;
            }
        }

		/// <summary>Run this operation</summary>
		/// <returns>
		///		Event.None
		///		Event.BalanceDone
		/// </returns>
		public Event Run()
		{
            if (!activityStarted && scale.Activity == Activity.Idle)
            {
                scale.SendSetUnitsCmd(units);
                activityStarted = true;
                scale.Activity = Activity.RunningOperation;
                return Event.None;
            }

            if (scale.MsrmntState == MsrmntState.Valid) return Event.BalanceDone;	/// Units set
			if (scale.MsrmntState == MsrmntState.Failed) return Event.Error;	    /// Failed
			return Event.None;														/// No result yet
		}

		/// <summary>Stop this operation</summary>
		public void Stop()
		{
            if (scale.MsrmntState == MsrmntState.Busy) scale.MsrmntState = MsrmntState.Failed;
            scale.Activity = Activity.Idle;
            log.DebugFormat("{0} - SetUnitsOp - Stop()", scale.Name);
		}
	}
}