///
/// Copyright (c) 2018 Sensus Slovensko a.s.
///
using System;
using log4net;
using TBF.Boxes;

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

		/// Set by the constructor
        readonly LevelMeter levelMeter;
		readonly Event eventDone;

        /// Measured value
        DoubleBox level;

		/// <summary>
		/// Events:  LevelDone or Error
		/// </summary>
		/// <param name="levelMeter">Water level meter reference</param>
		/// <param name="level">Reference to the measured level variable, value is in mm</param>
		/// <param name="eventDone">Event to be returned by Run() when completed OK</param>
        public ReadLevelOp(LevelMeter levelMeter, ref DoubleBox level, Event eventDone)
        {
            if (levelMeter == null) throw new ArgumentNullException("levelMeter");
            this.levelMeter = levelMeter;
            this.level = level;
            this.eventDone = eventDone;

			log.Debug(this.ToString());
        }
        public ReadLevelOp(LevelMeter levelMeter, ref DoubleBox level)
			: this(levelMeter, ref level, Event.LevelDone)
		{
		}


		/// <summary>Start this operation</summary>
		public void Start()
        {
            level.Val = levelMeter.ReadLevel();
        }

		/// <summary>Run this operation</summary>
		/// <returns>
		///		Event.LevelDone
		/// </returns>
		public Event Run()
		{
            level.Val = levelMeter.ReadLevel();
			return eventDone;
		}

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