using System;
using System.Collections.Generic;
using log4net;
using TBF.BenchControl.GenericDevices;

namespace TBF.BenchControl.Elde.Valve
{
	public class SetValvesOp : IOperation
	{
		private static readonly ILog log = LogManager.GetLogger(typeof(SetValvesOp));

		/// Set by the constructor
		ControlBoardDev controlBoard;

		class SwitchPoint
		{
			public int TimeSec;             /// Relative time in [s] from the start of the operation
            public IList<IValve> VOpen;     /// List of valves to open in this point of time
            public IList<IValve> VClose;    /// List of valves to close in this point of time
			public ulong MasksOpen;         /// OR-ed bitmasks of valves to open in this point of time
            public ulong MasksClose;        /// OR-ed bitmasks of valves to close in this point of time

            public SwitchPoint(int time, IList<IValve> vOpen, IList<IValve> vClose)
            {
                this.TimeSec = time;
                this.VOpen  = (vOpen == null) ? new List<IValve>() : vOpen;
                this.VClose = (vClose == null) ? new List<IValve>() : vClose;
            }

            /// Max. delay in [s] of all valves to be opened or closed 
            public int MaxDelay
            {
                get
                {
                    int max = 0;
                    foreach (var vlv in VOpen)  if ((vlv != null) && (vlv.Delay > max)) max = vlv.Delay;
                    foreach (var vlv in VClose) if ((vlv != null) && (vlv.Delay > max)) max = vlv.Delay;
                    return max;
                }
            }
		}

		IList<SwitchPoint> switchPointsRaw;
		IList<SwitchPoint> switchPoints;
		int nextIx;
		int swStartTime;
        int maxDelayTime;                   /// Max. delay from all valve/pump switches.
                                            /// Relative time in [s] from the start of the operation

		/// <summary>
		/// Processes coupled valves and creates switch points.
		/// </summary>
		/// <param name="valvesOpen">A list of opening master valves</param>
		/// <param name="valvesClose">A list of closing master valves</param>
		/// <returns></returns>
		IList<SwitchPoint> CollectSwitchPoints(IList<IValve> valvesOpen, IList<IValve> valvesClose)
		{
			IList<SwitchPoint> result = new List<SwitchPoint>();
			result.Add(new SwitchPoint(0, valvesOpen, valvesClose));

			foreach (var valve in StateMachine.CoupledValves)
			{
				if ((!valve.InvertCouple && valvesOpen.Contains(valve.CoupledTo)) ||
					(valve.InvertCouple && valvesClose.Contains(valve.CoupledTo)))
				{
					/// The coupled valve 'valve' is opening
					int time = valve.LagOpening;
					if (time == 0)
					{
						result[0].VOpen.Add(valve);
					}
					else
					{
						result.Add(new SwitchPoint(time, ValveBase.MakeList(valve), null));
					}
				}
				else if ((!valve.InvertCouple && valvesClose.Contains(valve.CoupledTo)) ||
						(valve.InvertCouple && valvesOpen.Contains(valve.CoupledTo)))
				{
					/// The coupled valve 'valve' is closing
					int time = valve.LagClosing;
					if (time == 0)
					{
						result[0].VClose.Add(valve);
					}
					else
					{
						result.Add(new SwitchPoint(time, null, ValveBase.MakeList(valve)));
					}
				}
			}
			return result;
		}


		IList<SwitchPoint> SortAndMergeSwitchPoints(IList<SwitchPoint> unsorted)
		{
			IList<SwitchPoint> result = new List<SwitchPoint>();

			SwitchPoint lastAdded = null;
			while (unsorted.Count > 0)
			{
				SwitchPoint first = null;
				foreach (var point in unsorted)
				{
					if (first == null || first.TimeSec > point.TimeSec) first = point;
				}
				if (lastAdded == null || lastAdded.TimeSec != first.TimeSec)
				{
					result.Add(first);
					lastAdded = first;
				}
				else
				{
					lastAdded.VOpen = ValveBase.Merge(lastAdded.VOpen, first.VOpen);
					lastAdded.VClose = ValveBase.Merge(lastAdded.VClose, first.VClose);
				}
				unsorted.Remove(first);
			}
			return result;
		}


		void MakeMasks(IList<SwitchPoint> switchPoints, int timeShift)
		{
			foreach (var point in switchPoints)
			{
				/// Only Elde.Valve valves are used, other valves are ignored
				point.MasksOpen = 0;
                foreach (var valve in point.VOpen)
                {
                    if (valve is Valve) point.MasksOpen |= (valve as Valve).Mask;
                    if (valve is Pump.Pump) point.MasksOpen |= (valve as Pump.Pump).Mask;
                    if (valve is PumpWithFM.Pump) point.MasksOpen |= (valve as PumpWithFM.Pump).Mask;
                }
				point.MasksClose = 0;
                foreach (var valve in point.VClose)
                {
                    if (valve is Valve) point.MasksClose |= (valve as Valve).Mask;
                    if (valve is Pump.Pump) point.MasksClose |= (valve as Pump.Pump).Mask;
                    if (valve is PumpWithFM.Pump) point.MasksClose |= (valve as PumpWithFM.Pump).Mask;
                }
				point.TimeSec += timeShift;
			}
		}


		/// <summary>
        /// Open and/or close multiple valves.
        /// Events:  ValvesSet
		/// </summary>
		/// <param name="controlBoard">Control board device</param>
		/// <param name="valvesOpen">A list of opening master valves</param>
		/// <param name="valvesClose">A list of closing master valves</param>
		/// <remarks>Only Elde.Valve valves are used, other valves on the lists are ignored</remarks>
		public SetValvesOp(ControlBoardDev controlBoard, IList<IValve> valvesOpen, IList<IValve> valvesClose)
        {
			if (controlBoard == null) throw new ArgumentNullException("ctrlBoard");
			this.controlBoard = controlBoard;

			if (valvesOpen == null) valvesOpen = new List<IValve>();
			if (valvesClose == null) valvesOpen = new List<IValve>();

			switchPointsRaw = CollectSwitchPoints(valvesOpen, valvesClose);
			switchPoints = SortAndMergeSwitchPoints(switchPointsRaw);
			int timeShift = -switchPoints[0].TimeSec;
			MakeMasks(switchPoints, timeShift);
        }

        /// <summary>
        /// Open one valve and/or close one valve.
        /// Events:  ValvesSet
        /// </summary>
        /// <param name="controlBoard">Control board device</param>
        /// <param name="valveOpen">Valve to be opened</param>
        /// <param name="valveClose">Valve to be closed</param>
        /// <remarks>Only Elde.Valve valves are used, other valves on the lists are ignored</remarks>
        public SetValvesOp(ControlBoardDev controlBoard, IValve valveOpen, IValve valveClose)
			: this(controlBoard, ValveBase.MakeList(valveOpen), ValveBase.MakeList(valveClose))
        {
        }

		/// <summary>Start this operation</summary>
		public void Start()
        {
			controlBoard.SetValves(switchPoints[0].MasksOpen, switchPoints[0].MasksClose);
			swStartTime = StateMachine.Time;
            maxDelayTime = switchPoints[0].MaxDelay;
            nextIx = 1;
		}

		/// <summary>Run this operation</summary>
		/// <returns>
		///		Event.SetValvesDone
		/// </returns>
		public Event Run()
		{
            if (nextIx >= switchPoints.Count)
            {
                if (StateMachine.Time >= swStartTime + maxDelayTime) return Event.ValvesSet;
                else                                                 return Event.None;
            }
			
			if (StateMachine.Time >= swStartTime + switchPoints[nextIx].TimeSec)
			{
                if (switchPoints[nextIx].TimeSec + switchPoints[nextIx].MaxDelay > maxDelayTime)
                {
                    maxDelayTime = switchPoints[nextIx].TimeSec + switchPoints[nextIx].MaxDelay;
                }
                controlBoard.SetValves(switchPoints[nextIx].MasksOpen, switchPoints[nextIx].MasksClose);
                nextIx++;
			}

			return Event.None;
		}

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