using Stateless;
using Prism.Ioc;
using DTS.Common.Enums.TSRAIRGo;
using DTS.Common.Utilities.Logging;
using System;
using Prism.Events;

namespace DTS.Common.DataModel.StateMachines
{
    public class OverallArmStatusStateMachine
    {
        private readonly IEventAggregator _eventAggregator;

        private StateMachine<ArmStateMachineStates.States, Triggers> overallArmStatusStateMachine = null;

        private StateMachine<ArmStateMachineStates.States, Triggers>.TriggerWithParameters<ArmStateMachineStates.States> NoDataToDownloadTrigger;
        private StateMachine<ArmStateMachineStates.States, Triggers>.TriggerWithParameters<ArmStateMachineStates.States> DataNeverDownloadedTrigger;
        private StateMachine<ArmStateMachineStates.States, Triggers>.TriggerWithParameters<ArmStateMachineStates.States> DASNotFoundTrigger;
        private StateMachine<ArmStateMachineStates.States, Triggers>.TriggerWithParameters<ArmStateMachineStates.States> FlashClearTrigger;
        private StateMachine<ArmStateMachineStates.States, Triggers>.TriggerWithParameters<ArmStateMachineStates.States> WaitingForTriggerTrigger;
        private StateMachine<ArmStateMachineStates.States, Triggers>.TriggerWithParameters<ArmStateMachineStates.States> WaitingForScheduleTrigger;
        private StateMachine<ArmStateMachineStates.States, Triggers>.TriggerWithParameters<ArmStateMachineStates.States> WaitingForIntervalTrigger;
        private StateMachine<ArmStateMachineStates.States, Triggers>.TriggerWithParameters<ArmStateMachineStates.States> RecordingTrigger;
        private StateMachine<ArmStateMachineStates.States, Triggers>.TriggerWithParameters<ArmStateMachineStates.States> DoneRecordingTrigger;
        private StateMachine<ArmStateMachineStates.States, Triggers>.TriggerWithParameters<ArmStateMachineStates.States> ErrorTrigger;
        private StateMachine<ArmStateMachineStates.States, Triggers>.TriggerWithParameters<ArmStateMachineStates.States> CheckingForDataTrigger;
        private StateMachine<ArmStateMachineStates.States, Triggers>.TriggerWithParameters<ArmStateMachineStates.States> GettingEventInfoTrigger;
        private StateMachine<ArmStateMachineStates.States, Triggers>.TriggerWithParameters<ArmStateMachineStates.States> ReadyForDownloadTrigger;
        private StateMachine<ArmStateMachineStates.States, Triggers>.TriggerWithParameters<ArmStateMachineStates.States> DownloadTrigger;
        private StateMachine<ArmStateMachineStates.States, Triggers>.TriggerWithParameters<ArmStateMachineStates.States> DownloadCleaningUpTrigger;
        private StateMachine<ArmStateMachineStates.States, Triggers>.TriggerWithParameters<ArmStateMachineStates.States> DownloadFinishedTrigger;
        private StateMachine<ArmStateMachineStates.States, Triggers>.TriggerWithParameters<ArmStateMachineStates.States> IDLETrigger;
        private StateMachine<ArmStateMachineStates.States, Triggers>.TriggerWithParameters<ArmStateMachineStates.States> StreamingTrigger;
        private StateMachine<ArmStateMachineStates.States, Triggers>.TriggerWithParameters<ArmStateMachineStates.States> DisarmTrigger;
        private StateMachine<ArmStateMachineStates.States, Triggers>.TriggerWithParameters<ArmStateMachineStates.States> RearmingTrigger;

        ArmStateMachineStates.States CurrentOverallStatusState = ArmStateMachineStates.States.CheckingForDAS;

        /// <summary>
        /// Initialize the Event Aggregator and the Overall Arm Status state machine.
        /// </summary>
        public OverallArmStatusStateMachine()
        {
            _eventAggregator =  ContainerLocator.Container.Resolve<IEventAggregator>();

            Initialize();
        }

        public enum Triggers
        {
            bFillingBuffer,
            CheckingForData,
            ConfigurationIsSet,
            DASNotFound,
            DataNeverDownloaded,
            Disarm,
            DoneRecording,
            Downloading,
            DownloadCleaningUp,
            DownloadFinished,
            Error,
            Faulted,
            FlashClear,
            GettingEventInfo,
            IDLE,
            IntervalRecording,
            NoDataToDownload,
            NonIntervalRecording,
            PostTestProcessing,
            ReadyForDownload,
            Rearming,
            Recording,
            RunButton,
            Streaming,
            WaitingForTrigger,
            WaitingForSchedule,
            WaitingForInterval,
            a,
            c,
            d,
            e,
            h,
            n,
            rr,
            tt,
            uu,
            yy
        }

        private void Initialize()
        {
            overallArmStatusStateMachine = new StateMachine<ArmStateMachineStates.States, Triggers>(ArmStateMachineStates.States.CheckingForDAS);

            NoDataToDownloadTrigger = overallArmStatusStateMachine.SetTriggerParameters<ArmStateMachineStates.States>(Triggers.NoDataToDownload);
            DataNeverDownloadedTrigger = overallArmStatusStateMachine.SetTriggerParameters<ArmStateMachineStates.States>(Triggers.DataNeverDownloaded);
            DASNotFoundTrigger = overallArmStatusStateMachine.SetTriggerParameters<ArmStateMachineStates.States>(Triggers.DASNotFound);
            FlashClearTrigger = overallArmStatusStateMachine.SetTriggerParameters<ArmStateMachineStates.States>(Triggers.FlashClear);
            RecordingTrigger = overallArmStatusStateMachine.SetTriggerParameters<ArmStateMachineStates.States>(Triggers.Recording);
            DoneRecordingTrigger = overallArmStatusStateMachine.SetTriggerParameters<ArmStateMachineStates.States>(Triggers.DoneRecording);
            WaitingForTriggerTrigger = overallArmStatusStateMachine.SetTriggerParameters<ArmStateMachineStates.States>(Triggers.WaitingForTrigger);
            WaitingForScheduleTrigger = overallArmStatusStateMachine.SetTriggerParameters<ArmStateMachineStates.States>(Triggers.WaitingForSchedule);
            WaitingForIntervalTrigger = overallArmStatusStateMachine.SetTriggerParameters<ArmStateMachineStates.States>(Triggers.WaitingForInterval);
            CheckingForDataTrigger = overallArmStatusStateMachine.SetTriggerParameters<ArmStateMachineStates.States>(Triggers.CheckingForData);
            ErrorTrigger = overallArmStatusStateMachine.SetTriggerParameters<ArmStateMachineStates.States>(Triggers.Error);
            GettingEventInfoTrigger = overallArmStatusStateMachine.SetTriggerParameters<ArmStateMachineStates.States>(Triggers.GettingEventInfo);
            ReadyForDownloadTrigger = overallArmStatusStateMachine.SetTriggerParameters<ArmStateMachineStates.States>(Triggers.ReadyForDownload);
            DownloadTrigger = overallArmStatusStateMachine.SetTriggerParameters<ArmStateMachineStates.States>(Triggers.Downloading);
            DownloadCleaningUpTrigger = overallArmStatusStateMachine.SetTriggerParameters<ArmStateMachineStates.States>(Triggers.DownloadCleaningUp);
            DownloadFinishedTrigger = overallArmStatusStateMachine.SetTriggerParameters<ArmStateMachineStates.States>(Triggers.DownloadFinished);
            IDLETrigger = overallArmStatusStateMachine.SetTriggerParameters<ArmStateMachineStates.States>(Triggers.IDLE);
            StreamingTrigger = overallArmStatusStateMachine.SetTriggerParameters<ArmStateMachineStates.States>(Triggers.Streaming);
            DisarmTrigger = overallArmStatusStateMachine.SetTriggerParameters<ArmStateMachineStates.States>(Triggers.Disarm);
            RearmingTrigger = overallArmStatusStateMachine.SetTriggerParameters<ArmStateMachineStates.States>(Triggers.Rearming);

            //--------------------CheckingForDAS--------------------
            overallArmStatusStateMachine.Configure(ArmStateMachineStates.States.CheckingForDAS)
                .OnEntryFrom(DASNotFoundTrigger, o => SetOverallStatus(o))
                .OnEntryFrom(FlashClearTrigger, o => SetOverallStatus(o))
                .OnEntryFrom(ReadyForDownloadTrigger, o => SetOverallStatus(o))
                .PermitReentry(Triggers.DASNotFound)
                .Permit(Triggers.Recording, ArmStateMachineStates.States.Recording)
                .Permit(Triggers.ReadyForDownload, ArmStateMachineStates.States.IDLE)
                .Permit(Triggers.NoDataToDownload, ArmStateMachineStates.States.IDLE)
                .Permit(Triggers.DataNeverDownloaded, ArmStateMachineStates.States.IDLE)
                .Permit(Triggers.DoneRecording, ArmStateMachineStates.States.IDLE)
                .Permit(Triggers.Streaming, ArmStateMachineStates.States.Streaming)
                .Permit(Triggers.FlashClear, ArmStateMachineStates.States.ClearingFlash)
                .Permit(Triggers.WaitingForTrigger, ArmStateMachineStates.States.WaitingForTrigger)
                .Permit(Triggers.WaitingForSchedule, ArmStateMachineStates.States.WaitingForSchedule)
                .Permit(Triggers.WaitingForInterval, ArmStateMachineStates.States.WaitingForInterval);

            //--------------------IDLE--------------------------------
            overallArmStatusStateMachine.Configure(ArmStateMachineStates.States.IDLE)
                .OnEntryFrom(ReadyForDownloadTrigger, o => SetOverallStatus(o))
                .OnEntryFrom(NoDataToDownloadTrigger, o => SetOverallStatus(o))
                .OnEntryFrom(DataNeverDownloadedTrigger, o => SetOverallStatus(o))
                .OnEntryFrom(DoneRecordingTrigger, o => SetOverallStatus(o))
                .OnEntryFrom(FlashClearTrigger, o => SetOverallStatus(o))
                .OnEntryFrom(WaitingForTriggerTrigger, o => SetOverallStatus(o))
                .OnEntryFrom(StreamingTrigger, o => SetOverallStatus(o))
                .Permit(Triggers.DASNotFound, ArmStateMachineStates.States.CheckingForDAS)
                .Permit(Triggers.FlashClear, ArmStateMachineStates.States.ClearingFlash)
                .Permit(Triggers.WaitingForTrigger, ArmStateMachineStates.States.WaitingForTrigger)
                .Permit(Triggers.WaitingForSchedule, ArmStateMachineStates.States.WaitingForSchedule)
                .Permit(Triggers.WaitingForInterval, ArmStateMachineStates.States.WaitingForInterval)
                .PermitReentry(Triggers.ReadyForDownload)
                .PermitReentry(Triggers.NoDataToDownload)
                .PermitReentry(Triggers.DataNeverDownloaded)
                .PermitReentry(Triggers.DoneRecording);

            //--------------------Streaming--------------------------
            overallArmStatusStateMachine.Configure(ArmStateMachineStates.States.Streaming)
                .OnEntryFrom(StreamingTrigger, o => SetOverallStatus(o))
                .Permit(Triggers.DASNotFound, ArmStateMachineStates.States.CheckingForDAS)
                .Permit(Triggers.DoneRecording, ArmStateMachineStates.States.IDLE)
                .Permit(Triggers.NoDataToDownload, ArmStateMachineStates.States.IDLE)
                .PermitReentry(Triggers.Streaming);

            //--------------------ClearingFlash-----------------------
            overallArmStatusStateMachine.Configure(ArmStateMachineStates.States.ClearingFlash)
                .OnEntryFrom(FlashClearTrigger, o => SetOverallStatus(o))
                .Ignore(Triggers.ReadyForDownload)
                .Ignore(Triggers.NoDataToDownload)
                .Ignore(Triggers.DataNeverDownloaded)
                .Permit(Triggers.WaitingForTrigger, ArmStateMachineStates.States.WaitingForTrigger)
                .Permit(Triggers.WaitingForSchedule, ArmStateMachineStates.States.WaitingForSchedule)
                .Permit(Triggers.WaitingForInterval, ArmStateMachineStates.States.WaitingForInterval)
                .Permit(Triggers.Disarm, ArmStateMachineStates.States.Disarmed)
                .Permit(Triggers.Streaming, ArmStateMachineStates.States.Streaming)
                .Permit(Triggers.DASNotFound, ArmStateMachineStates.States.CheckingForDAS)
                .PermitReentry(Triggers.FlashClear);

            //--------------------WaitingForTrigger------------------
            overallArmStatusStateMachine.Configure(ArmStateMachineStates.States.WaitingForTrigger)
                .OnEntryFrom(WaitingForTriggerTrigger, o => SetOverallStatus(o))
                .Ignore(Triggers.DataNeverDownloaded)
                .Permit(Triggers.DASNotFound, ArmStateMachineStates.States.CheckingForDAS)
                .Permit(Triggers.Recording, ArmStateMachineStates.States.Recording)
                .Permit(Triggers.DoneRecording, ArmStateMachineStates.States.IDLE)
                .Permit(Triggers.ReadyForDownload, ArmStateMachineStates.States.IDLE)
                .Permit(Triggers.NoDataToDownload, ArmStateMachineStates.States.IDLE)
                .Permit(Triggers.Disarm, ArmStateMachineStates.States.Disarmed)
                .Permit(Triggers.Rearming, ArmStateMachineStates.States.Rearming)
                .PermitReentry(Triggers.WaitingForTrigger)
                .PermitReentry(Triggers.WaitingForSchedule)
                .PermitReentry(Triggers.WaitingForInterval);

            //--------------------WaitingForSchedule------------------
            overallArmStatusStateMachine.Configure(ArmStateMachineStates.States.WaitingForSchedule)
                .OnEntryFrom(WaitingForScheduleTrigger, o => SetOverallStatus(o))
                .OnEntryFrom(DisarmTrigger, o => SetOverallStatus(o))
                .Ignore(Triggers.DataNeverDownloaded)
                .Permit(Triggers.DASNotFound, ArmStateMachineStates.States.CheckingForDAS)
                .Permit(Triggers.Recording, ArmStateMachineStates.States.Recording)
                .Permit(Triggers.DoneRecording, ArmStateMachineStates.States.IDLE)
                .Permit(Triggers.WaitingForInterval, ArmStateMachineStates.States.WaitingForInterval)
                .Permit(Triggers.ReadyForDownload, ArmStateMachineStates.States.IDLE)
                .Permit(Triggers.NoDataToDownload, ArmStateMachineStates.States.IDLE)
                .Permit(Triggers.Disarm, ArmStateMachineStates.States.Disarmed)
                .PermitReentry(Triggers.WaitingForSchedule);

            //--------------------WaitingForInterval------------------
            overallArmStatusStateMachine.Configure(ArmStateMachineStates.States.WaitingForInterval)
                .OnEntryFrom(WaitingForIntervalTrigger, o => SetOverallStatus(o))
                .OnEntryFrom(DisarmTrigger, o => SetOverallStatus(o))
                .Ignore(Triggers.DataNeverDownloaded)
                .Permit(Triggers.DASNotFound, ArmStateMachineStates.States.CheckingForDAS)
                .Permit(Triggers.Recording, ArmStateMachineStates.States.Recording)
                .Permit(Triggers.DoneRecording, ArmStateMachineStates.States.IDLE)
                .Permit(Triggers.ReadyForDownload, ArmStateMachineStates.States.IDLE)
                .Permit(Triggers.NoDataToDownload, ArmStateMachineStates.States.IDLE)
                .Permit(Triggers.Disarm, ArmStateMachineStates.States.Disarmed)
                .PermitReentry(Triggers.WaitingForInterval);

            //--------------------Recording--------------------------
            overallArmStatusStateMachine.Configure(ArmStateMachineStates.States.Recording)
                .OnEntryFrom(RecordingTrigger, o => SetOverallStatus(o))
                .OnEntryFrom(DoneRecordingTrigger, o => SetOverallStatus(o))
                .OnEntryFrom(WaitingForIntervalTrigger, o => SetOverallStatus(o))
                .Permit(Triggers.DASNotFound, ArmStateMachineStates.States.CheckingForDAS)
                .Permit(Triggers.DoneRecording, ArmStateMachineStates.States.PostTestProcessing)
                .Permit(Triggers.WaitingForTrigger, ArmStateMachineStates.States.WaitingForTrigger)
                .Permit(Triggers.WaitingForInterval, ArmStateMachineStates.States.WaitingForInterval)
                .Permit(Triggers.Rearming, ArmStateMachineStates.States.Rearming)
                .Permit(Triggers.ReadyForDownload, ArmStateMachineStates.States.IDLE)
                .Permit(Triggers.NoDataToDownload, ArmStateMachineStates.States.IDLE)
                .Permit(Triggers.DataNeverDownloaded, ArmStateMachineStates.States.ReadyForDownload)
                .Permit(Triggers.Disarm, ArmStateMachineStates.States.Disarmed)
                .PermitReentry(Triggers.Recording);

            //--------------------Rearming-----------------
            overallArmStatusStateMachine.Configure(ArmStateMachineStates.States.Rearming)
                .OnEntryFrom(RecordingTrigger, o => SetOverallStatus(o))
                .OnEntryFrom(WaitingForTriggerTrigger, o => SetOverallStatus(o))
                .Permit(Triggers.WaitingForTrigger, ArmStateMachineStates.States.WaitingForTrigger)
                .Permit(Triggers.WaitingForInterval, ArmStateMachineStates.States.WaitingForInterval)
                .Permit(Triggers.Recording, ArmStateMachineStates.States.Recording)
                .PermitReentry(Triggers.Rearming);

            //--------------------Disarmed-----------------
            overallArmStatusStateMachine.Configure(ArmStateMachineStates.States.Disarmed)
                .OnEntryFrom(DisarmTrigger, o => SetOverallStatus(o))
                .Permit(Triggers.DASNotFound, ArmStateMachineStates.States.CheckingForDAS)
                .Permit(Triggers.NoDataToDownload, ArmStateMachineStates.States.IDLE)
                .Permit(Triggers.ReadyForDownload, ArmStateMachineStates.States.IDLE)
                .Permit(Triggers.DataNeverDownloaded, ArmStateMachineStates.States.IDLE)
                .Permit(Triggers.FlashClear, ArmStateMachineStates.States.ClearingFlash);

            //--------------------PostTestProcessing-----------------
            overallArmStatusStateMachine.Configure(ArmStateMachineStates.States.PostTestProcessing)
                .OnEntryFrom(DoneRecordingTrigger, o => SetOverallStatus(o))
                .Permit(Triggers.GettingEventInfo, ArmStateMachineStates.States.GettingEventInfo)
                .PermitReentry(Triggers.PostTestProcessing);

            //--------------------CheckingForData-----------------
            overallArmStatusStateMachine.Configure(ArmStateMachineStates.States.CheckingForData)
                .OnEntryFrom(DoneRecordingTrigger, o => SetOverallStatus(o))
                .OnEntryFrom(CheckingForDataTrigger, o => SetOverallStatus(o))
                .Permit(Triggers.GettingEventInfo, ArmStateMachineStates.States.GettingEventInfo)
                .PermitReentry(Triggers.DoneRecording)
                .PermitReentry(Triggers.CheckingForData);

            //--------------------GettingEventInfo-----------------
            overallArmStatusStateMachine.Configure(ArmStateMachineStates.States.GettingEventInfo)
                .OnEntryFrom(GettingEventInfoTrigger, o => SetOverallStatus(o))
                .OnEntryFrom(DataNeverDownloadedTrigger, o => SetOverallStatus(o))
                .Permit(Triggers.DataNeverDownloaded, ArmStateMachineStates.States.ReadyForDownload);

            //--------------------ReadyForDownload-----------------
            overallArmStatusStateMachine.Configure(ArmStateMachineStates.States.ReadyForDownload)
                .OnEntryFrom(DataNeverDownloadedTrigger, o => SetOverallStatus(o))
                .OnEntryFrom(ReadyForDownloadTrigger, o => SetOverallStatus(o))
                .OnEntryFrom(FlashClearTrigger, o => SetOverallStatus(o))
                .OnEntryFrom(WaitingForTriggerTrigger, o => SetOverallStatus(o)) //In case Flash Clear finishes very quickly
                .OnEntryFrom(WaitingForScheduleTrigger, o => SetOverallStatus(o))
                .OnEntryFrom(WaitingForIntervalTrigger, o => SetOverallStatus(o))
                .Permit(Triggers.DASNotFound, ArmStateMachineStates.States.IDLE)
                .Permit(Triggers.Downloading, ArmStateMachineStates.States.Downloading)
                .Permit(Triggers.FlashClear, ArmStateMachineStates.States.ClearingFlash)
                .Permit(Triggers.WaitingForTrigger, ArmStateMachineStates.States.WaitingForTrigger)
                .Permit(Triggers.WaitingForSchedule, ArmStateMachineStates.States.WaitingForSchedule)
                .Permit(Triggers.WaitingForInterval, ArmStateMachineStates.States.WaitingForInterval)
                .Ignore(Triggers.DataNeverDownloaded)
                .PermitReentry(Triggers.ReadyForDownload);

            string graph = Stateless.Graph.UmlDotGraph.Format(overallArmStatusStateMachine.GetInfo());
            graph = graph.Replace("DTS.DASLib.Service.StateMachine.", "");

        }
        public delegate void OverallStatusStateChangeDelegate(ArmStateMachineStates.States previousState,  ArmStateMachineStates.States nextState);

        /// <summary>
        /// Handler for consumers to be notified when overall state transitions
        /// </summary>
        public event OverallStatusStateChangeDelegate OverallStatusStateChange;
        /// <summary>
        /// Display a message in the Global Status field.
        /// </summary>
        /// <param name="newState"></param>
        private void SetOverallStatus(ArmStateMachineStates.States newState)
        {
            if (newState != CurrentOverallStatusState)
            {
                APILogger.Log($"Transitioning from {CurrentOverallStatusState} to {newState}");
                OverallStatusStateChange?.Invoke(CurrentOverallStatusState, newState);
                CurrentOverallStatusState = newState;
            }            
        }

        public ArmStateMachineStates.States GetDASStatus()
        {
            return CurrentOverallStatusState;
        }

        public void FireTrigger(Triggers trigger, ArmStateMachineStates.States state)
        {
            try
            {
                //why specify state here? shouldn't that be done based on current state/trigger?
                switch (trigger)
                {
                    case Triggers.DASNotFound:
                        overallArmStatusStateMachine.Fire(DASNotFoundTrigger, state);
                        break;
                    case Triggers.NoDataToDownload:
                        overallArmStatusStateMachine.Fire(NoDataToDownloadTrigger, state);
                        break;
                    case Triggers.DataNeverDownloaded:
                        overallArmStatusStateMachine.Fire(DataNeverDownloadedTrigger, state);
                        break;
                    case Triggers.DoneRecording:
                        overallArmStatusStateMachine.Fire(DoneRecordingTrigger, state);
                        break;
                    case Triggers.FlashClear:
                        overallArmStatusStateMachine.Fire(FlashClearTrigger, state);
                        break;
                    case Triggers.WaitingForTrigger:
                        overallArmStatusStateMachine.Fire(WaitingForTriggerTrigger, state);
                        break;
                    case Triggers.WaitingForSchedule:
                        overallArmStatusStateMachine.Fire(WaitingForScheduleTrigger, state);
                        break;
                    case Triggers.WaitingForInterval:
                        overallArmStatusStateMachine.Fire(WaitingForIntervalTrigger, state);
                        break;
                    case Triggers.Recording:
                        overallArmStatusStateMachine.Fire(RecordingTrigger, state);
                        break;
                    case Triggers.PostTestProcessing:
                        overallArmStatusStateMachine.Fire(DoneRecordingTrigger, state);
                        break;
                    case Triggers.CheckingForData:
                        overallArmStatusStateMachine.Fire(CheckingForDataTrigger, state);
                        break;
                    case Triggers.GettingEventInfo:
                        overallArmStatusStateMachine.Fire(GettingEventInfoTrigger, state);
                        break;
                    case Triggers.ReadyForDownload:
                        overallArmStatusStateMachine.Fire(ReadyForDownloadTrigger, state);
                        break;
                    case Triggers.Error:
                        overallArmStatusStateMachine.Fire(ErrorTrigger, state);
                        break;
                    case Triggers.Streaming:
                        overallArmStatusStateMachine.Fire(StreamingTrigger, state);
                        break;
                    case Triggers.Disarm:
                        overallArmStatusStateMachine.Fire(DisarmTrigger, state);
                        break;
                    case Triggers.Rearming:
                        overallArmStatusStateMachine.Fire(RearmingTrigger, state);
                        break;
                    default:
                        break;
                }
            }
            catch (Exception ex)
            {
                APILogger.Log(ex.Message);
            }
        }
    }
}