using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using log4net;

namespace TBF.BenchControl.MettlerToledo
{
	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 balanceDev;
		BalanceDev.Units units;

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

			this.units = units;

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

		/// <summary>Start this operation</summary>
		public void Start()
        {
			log.Debug("Start()");
			balanceDev.SetUnits(units);
		}

		/// <summary>Run this operation</summary>
		/// <returns>
		///		Event.None
		///		Event.BalanceDone
		/// </returns>
		public Event Run()
		{
			if (balanceDev.MsrmntState == MsrmntState.Valid) return Event.BalanceDone;		/// Units set
			if (balanceDev.MsrmntState == MsrmntState.Failed) return Event.Error;	/// Failed
			return Event.None;														/// No result yet
		}

		/// <summary>Stop this operation</summary>
		public void Stop()
		{
			log.Debug("Stop()");
		}
	}
}