///
/// Copyright (c) 2017-2018 Sensus Metering Systems
///
using System;
using System.Collections.Generic;
using log4net;
using TBF.Rig.GenericDevices;
using TBF.Resources;

namespace TBF.Rig.MettlerToledo
{
	public enum DrainState
	{
		None,
		OpeningDV_Start,
		OpeningDV_Run,
		OpeningDV_Stop,
		Draining,
		ClosingDV_Start,
		ClosingDV_Run,
		ClosingDV_Stop,
		TankClosed,
	}

	public class TankDraining : ComponentBase, ITankDraining, ISequenceCondition
	{
		private static readonly ILog log = LogManager.GetLogger(typeof(TankDraining));


		readonly GenericDevices.ITankDrainingCfg tankDrainingCfg;

        bool hasDrainValve { get { return !string.IsNullOrEmpty(tankDrainingCfg.DrainValve); } }    /// Available in UI (unlike 'drainValve')
		IValve drainValve;
		public IValve DrainValve { get { return drainValve; } }
        IEvaporation evaporationCmpnt;

		IOperation openTheDrainValveOp;
		IOperation closeTheDrainValveOp;
		IOperation waitTankIsEmptyOp;
        IOperation waitTankContainsMoreThenThld1Op;
        IOperation waitTankContainsMoreThenThld2Op;
        IOperation waitTankContainsMoreThenThld3Op;
        IOperation waitTankContainsMoreThenThld4Op;

		DrainState drainState;


		public TankDraining()
			: base()
		{
			openTheDrainValveOp = null;
			closeTheDrainValveOp = null;
			waitTankIsEmptyOp = null;
            waitTankContainsMoreThenThld1Op = null;
            waitTankContainsMoreThenThld2Op = null;
            waitTankContainsMoreThenThld3Op = null;
            waitTankContainsMoreThenThld4Op = null;
        }

		public TankDraining(Generic.IComponentCfg cfg)
			: base(cfg)
        {
			tankDrainingCfg = cfg as GenericDevices.ITankDrainingCfg;
			if (tankDrainingCfg == null) throw new Exception(string.Format("Cannot create component {0}", cfg.Name));

			openTheDrainValveOp = null;
			closeTheDrainValveOp = null;
			waitTankIsEmptyOp = null;
            waitTankContainsMoreThenThld1Op = null;
            waitTankContainsMoreThenThld2Op = null;
            waitTankContainsMoreThenThld3Op = null;
            waitTankContainsMoreThenThld4Op = null;
        }

		public override void Initialize()
		{
			drainValve = TbfComponents.FindComponent(tankDrainingCfg.DrainValve) as IValve;
            evaporationCmpnt = TbfComponents.FindComponent(tankDrainingCfg.Evaporation) as IEvaporation;

            if (drainValve == null) throw new Exception(string.Format("{0} is missing a drain valve", Name));

			openTheDrainValveOp = new BuiltIn.SetValvesOp(StateMachine.ControlBoard, drainValve, null);
            closeTheDrainValveOp = new BuiltIn.SetValvesOp(StateMachine.ControlBoard, null, drainValve);
			waitTankIsEmptyOp = new WaitTankEmptyOp(this);

            Various.TankWithLevelMsrmnt.TankCfg tankCfg = tankDrainingCfg as Various.TankWithLevelMsrmnt.TankCfg;
            if (tankCfg != null)
            {
                waitTankContainsMoreThenThld1Op = new WaitTankContainsMoreThenOp(this, tankCfg.ThldLevel1);
                waitTankContainsMoreThenThld2Op = new WaitTankContainsMoreThenOp(this, tankCfg.ThldLevel2);
                waitTankContainsMoreThenThld3Op = new WaitTankContainsMoreThenOp(this, tankCfg.ThldLevel3);
                waitTankContainsMoreThenThld4Op = new WaitTankContainsMoreThenOp(this, tankCfg.ThldLevel4);
            }
        }

		protected void RunBefore()
		{
			switch (drainState)
			{
				case DrainState.OpeningDV_Start:
					openTheDrainValveOp.Start();
					drainState = DrainState.OpeningDV_Run;
					return;

				case DrainState.OpeningDV_Run:
					if (openTheDrainValveOp.Run() == Event.ValvesSet) drainState = DrainState.OpeningDV_Stop;
					return;

				case DrainState.OpeningDV_Stop:
					openTheDrainValveOp.Stop();
					return;

				case DrainState.Draining:
					if (IsEmpty()) drainState = DrainState.ClosingDV_Start;
					return;

				case DrainState.ClosingDV_Start:
					closeTheDrainValveOp.Start();
					drainState = DrainState.ClosingDV_Run;
					return;

				case DrainState.ClosingDV_Run:
					if (closeTheDrainValveOp.Run() == Event.ValvesSet) drainState = DrainState.ClosingDV_Stop;
					return;

				case DrainState.ClosingDV_Stop:
					closeTheDrainValveOp.Stop();
					return;

				default:
					return;
			}
		}

		protected void RunAfter() { }	/// Not used


		public virtual string GetName() { return string.Empty; }
		public virtual bool IsEmpty() { return false; }
        public virtual bool ContainsMoreThen(float thld) { return thld == 0; }

        /// <summary>
        /// For a given temperature in [°C] returns an evaporation rate in [kg/s]
        /// </summary>
        public double EvaporationRate(double temperature)
        {
            return (evaporationCmpnt != null) ? evaporationCmpnt.EvaporationRate(temperature) : 0;
        }

        public int ConditionsCount
        {
            get { return hasDrainValve ? 3 : ((tankDrainingCfg is Various.TankWithLevelMsrmnt.TankCfg) ? 4 : 0); } 
        }

		/// Strings are added to the combo-box for transition sequence condition selection
		public string ConditionName(int i)
		{
            if (hasDrainValve)
            {
                switch (i)
                {
                    case 0: return string.Format(Strings._0_open_the_drain_valve, Name);
                    case 1: return string.Format(Strings._0_close_the_drain_valve, Name);
                    case 2: return string.Format(Strings._0_wait_until_the_tank_is_empty, Name);
                }
            }
            else if (tankDrainingCfg is Various.TankWithLevelMsrmnt.TankCfg)
            {
                var tankCfg = tankDrainingCfg as Various.TankWithLevelMsrmnt.TankCfg;
                switch (i)
                {
                    case 0: return string.Format(Strings._0_wait_until_tank_contains_more_then_1_l, Name, tankCfg.ThldLevel1);
                    case 1: return string.Format(Strings._0_wait_until_tank_contains_more_then_1_l, Name, tankCfg.ThldLevel2);
                    case 2: return string.Format(Strings._0_wait_until_tank_contains_more_then_1_l, Name, tankCfg.ThldLevel3);
                    case 3: return string.Format(Strings._0_wait_until_tank_contains_more_then_1_l, Name, tankCfg.ThldLevel4);
                }
            }

            return string.Empty;    // Default
		}

		/// Operation to be executed as a part of a transition sequence
		public IOperation ConditionOp(int i)
		{
            if (hasDrainValve)
            {
                switch (i)
                {
                    case 0: return openTheDrainValveOp;
                    case 1: return closeTheDrainValveOp;
                    case 2: return waitTankIsEmptyOp;
                }
            }
            else if (tankDrainingCfg is Various.TankWithLevelMsrmnt.TankCfg)
            {
                switch (i)
                {
                    case 0: return waitTankContainsMoreThenThld1Op;
                    case 1: return waitTankContainsMoreThenThld2Op;
                    case 2: return waitTankContainsMoreThenThld3Op;
                    case 3: return waitTankContainsMoreThenThld4Op;
                }
            }

            return null;        /// Default
		}
	}
}