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

namespace TBF.BenchControl.Elde.RegulValve
{
	public class SetFlowOp : IOperation
	{
		private static readonly ILog log = LogManager.GetLogger(typeof(SetFlowOp));
		public override string ToString()
		{
			return string.Format("SetFlowOp({0},{1},{2})", regulValve.Name, reqFlowLo, reqFlowHi);
		}

		/// Set by the constructor
		readonly ControlBoardDev controlBoard;
        readonly Elde.FlowMeter.FlowMeter flowMeter;
        readonly Elde.RegulValve.RegulValve regulValve;
		readonly int regulValveNr;
		readonly int flowMeterNr;
		readonly float reqFlowLo;
        readonly float reqFlowHi;
		readonly float reqFlowAve;
		readonly int timeout;
        readonly bool leaveMeasurementRunning;

        ///  Process values
		enum OpState
		{
			Idle = 0,
			ValveMoveToPosition,
			SettingPosition,
			ValveMoveToFlow,
			SettingFlow,
			FlowReached,
		}
		OpState opState;

		float targetPositionLo;
		float targetPositionHi;

        int expireTime;
        FloatBox measuredFlow;

		
		/// <summary>
        /// Set required water flow. Conditionally leave the measurement running.
        /// Events:  FlowSet, FlowTimeOut
		/// </summary>
		/// <param name="controlBoard">Control board device</param>
		/// <param name="regulValve">Regulation valve component</param>
        /// <param name="flowMeter">Flowmeter component</param>
		/// <param name="requiredFlowLo">Lower limit of the flow to be achieved in [m3/h]</param>
		/// <param name="requiredFlowHi">Upper limit of the flow to be achieved in [m3/h]</param>
		/// <param name="timeout">Timeout for the flow setting in [s]</param>
        /// <param name="leaveMeasurementRunning">true = Leave the measurement running after op. stop</param>
        /// <remarks>Only Elde.Valve flow are used, other flow on the lists are ignored</remarks>
        public SetFlowOp(ControlBoardDev controlBoard, IRegulValve regulValve, IFlowMeter flowMeter,
                         float requiredFlowLo, float requiredFlowHi, FloatBox measuredFlow, int timeout, bool leaveMeasurementRunning)
        {
			if (controlBoard == null) throw new ArgumentNullException("ctrlBoard");
			this.controlBoard = controlBoard;

            this.regulValve = regulValve as Elde.RegulValve.RegulValve;
            if (regulValve == null) throw new ArgumentNullException("regValve is null or not Elde");
			this.regulValveNr = this.regulValve.Position;

            this.flowMeter = flowMeter as Elde.FlowMeter.FlowMeter;
            if (flowMeter == null) throw new ArgumentNullException("flowMeter in null or not Elde");
            this.flowMeterNr = this.flowMeter.Position;

            this.reqFlowLo = requiredFlowLo;
            this.reqFlowHi = requiredFlowHi;
			this.reqFlowAve = (reqFlowLo + reqFlowHi) / 2.0f;
			this.measuredFlow = measuredFlow;

            this.timeout = timeout;

            this.leaveMeasurementRunning = leaveMeasurementRunning;

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

        /// <summary>
        /// Set required water flow - Do not leave the measurement running.
        /// Events:  FlowSet
        /// </summary>
        public SetFlowOp(ControlBoardDev controlBoard, IRegulValve regValve, IFlowMeter flowMeter,
                         float requiredFlowLo, float requiredFlowHi, FloatBox measuredFlow, int timeout)
            : this(controlBoard, regValve, flowMeter, requiredFlowLo, requiredFlowHi, measuredFlow, timeout, false)
        {
        }

        /// <summary>
        /// Set required water flow - No timeout.
        /// Events:  FlowSet
        /// </summary>
        public SetFlowOp(ControlBoardDev controlBoard, IRegulValve regValve, IFlowMeter flowMeter,
                         float requiredFlowLo, float requiredFlowHi, FloatBox measuredFlow)
			: this(controlBoard, regValve, flowMeter, requiredFlowLo, requiredFlowHi, measuredFlow, int.MaxValue, false)
        {
        }

		/// <summary>
        /// Fetch target position limits from the dictionary or return false
		/// </summary>
        /// <param name="avgReqFlow">Average of the flow targer range (input)</param>
		/// <param name="positionLo">Target valve position low limit (output)</param>
		/// <param name="positionHi">Target valve position high limit (output)</param>
		/// <returns>true when positions for the target flow are stored in the memory, otherwise return false</returns>
		bool FetchTargetPosition(float avgReqFlow, out float positionLo, out float positionHi)
		{
			float targetPosition;
			if (regulValve.Dict.TryGetValue(avgReqFlow, out targetPosition))
			{
				positionLo = Math.Max(targetPosition * 0.95f, 0.0f);
				positionHi = Math.Min(targetPosition * 1.05f, 100.0f);
				return true;
			}
			else
			{
				positionLo = 0.0f;
				positionHi = 0.0f;
				return false;
			}
		}

        void StoreTargetPosition(float avgReqFlow, float actPosition)
		{
			if (!regulValve.Dict.ContainsKey(reqFlowAve))
			{
                regulValve.Dict.Add(new KeyValuePair<float, float>(avgReqFlow, actPosition));
			}
			return;
		}

		/// <summary>Start this operation</summary>
		public void Start()
        {
            if (regulValve.RegulValveCfg.StoredPositionReuse && FetchTargetPosition(reqFlowAve, out targetPositionLo, out targetPositionHi))
			{
                log.InfoFormat("Start(): rv#={0} flowMtr#={1} TARGET: flowLo={2} flowHi={3} FETCHED: posLo={4} posHi={5}",
                                regulValveNr, flowMeterNr, reqFlowLo, reqFlowHi, targetPositionLo, targetPositionHi);

				opState = OpState.ValveMoveToPosition;
			}
			else
			{
                log.InfoFormat("Start(): rv#={0} flowMtr#={1} TARGET: flowLo={2} flowHi={3}",
                                regulValveNr, flowMeterNr, reqFlowLo, reqFlowHi);

				opState = OpState.ValveMoveToFlow;
			}

            expireTime = StateMachine.Time + timeout;
            if (expireTime < 0) expireTime = int.MaxValue;

            TestMethods tm = 0;
            StopDevs sd = 0;
			controlBoard.SendCommand(Command.Start, flowMeterNr, controlBoard.Route, int.MaxValue, tm,
                                     0.0f, regulValve.RegulValveCfg.PidCoef, 0, sd); 
		}

		/// <summary>Run this operation</summary>
		/// <returns>
		///		Event.None, Event.FlowReached, Event.RegulValveTimeOut, Event.OpArgumentError
		/// </returns>
		public Event Run()
		{
            float rvPosition = controlBoard.RValvePosition(regulValveNr);
			float flowMtrFreq = controlBoard.ReferenceFreq;
            float flow = flowMtrFreq * flowMeter.NominalFlow / 2000.0f;

			if (measuredFlow != null) measuredFlow.Val = flow;

            log.InfoFormat("Run(): rv#={0} pos={1}% freq={2} flow={3} opState={4}",
                            regulValveNr, rvPosition.ToString("F1"), flowMtrFreq, flow, opState);

			if (opState == OpState.ValveMoveToPosition)
			{
				controlBoard.ValveMove(regulValveNr, RegulValveMode.TargetPosition,
									   new float[2] { targetPositionLo, targetPositionHi });

				opState = OpState.SettingPosition;
				return Event.None;
			}
			else if (opState == OpState.SettingPosition)
			{
                if ((targetPositionLo <= rvPosition) && (rvPosition <= targetPositionHi))
                {
                    opState = OpState.ValveMoveToFlow;
                }
                return Event.None;
			}
			else if (opState == OpState.ValveMoveToFlow)
            {
                if (reqFlowLo >= reqFlowHi || reqFlowLo > flowMeter.NominalFlow || reqFlowHi <= 0)
                {
					return Event.OpArgumentError;
                }

                log.InfoFormat("Run(): rv#={0} flowMtr#={1} TARGET: flowLo={2} flowHi={3}",
                                regulValveNr, flowMeterNr, reqFlowLo, reqFlowHi);

                float freqLo = 2000.0f * reqFlowLo / flowMeter.NominalFlow;
                float freqHi = 2000.0f * reqFlowHi / flowMeter.NominalFlow;
                controlBoard.ValveMove(regulValveNr, RegulValveMode.TargetFrequency,
                                       new float[2] { freqLo, freqHi });

				opState = OpState.SettingFlow;
				return Event.None;
            }
			else if (opState == OpState.SettingFlow)
			{
				if ((reqFlowLo <= flow) && (flow <= reqFlowHi))
				{
                    if (regulValve.RegulValveCfg.StoredPositionReuse)
                    {
                        float storedPosition;
                        if (regulValve.Dict.TryGetValue(reqFlowAve, out storedPosition))
                        {
                            /// update the stored valve position
                            StoreTargetPosition(reqFlowAve, (rvPosition + storedPosition) / 2.0f);
                            log.InfoFormat("Run(): rv#={0} reqFlow={1} pos={2}% stored={3} <--- Updating a stored position",
                                            regulValveNr, reqFlowAve, rvPosition.ToString("F1"), storedPosition);
                        }
                        else
                        {
                            /// store the valve position
                            StoreTargetPosition(reqFlowAve, rvPosition);
                            log.InfoFormat("Run(): rv#={0} reqFlow={1} pos={2}% <--- Storing a new position",
                                            regulValveNr, reqFlowAve, rvPosition.ToString("F1"));
                        }
                    }

                    opState = OpState.FlowReached;
                    return Event.FlowReached;
				}
				else if (StateMachine.Time > expireTime)
				{
					return Event.RegulValveTimeOut;
				}
				else
				{
					return Event.None;
				}
			}
			else /// opState == OpState.FlowReached
			{
				return Event.FlowReached;
			}
		}

        /// <summary>Start this operation</summary>
        public void Stop()
		{
			opState = OpState.Idle;

            if (leaveMeasurementRunning) return;
            
			/// Stop measurement
            TestMethods tm = 0;
            StopDevs sd = StopDevs.RegValveRegulation;
            controlBoard.SendCommand(Command.Stop, flowMeterNr, controlBoard.Route, 50000, tm,
                                     0.0f, 20, 0, sd);
        }
	}
}