using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Threading.Tasks;
using DTS.Common.Base;
using Unity;
using DTS.Common.Enums.Viewer;
using DTS.Common.Events;
using DTS.Common.Interface;
using Prism.Events;
using Prism.Regions;
using DTS.Common.Interactivity;
using Prism.Commands;
// ReSharper disable UnassignedGetOnlyAutoProperty
// ReSharper disable InconsistentNaming
// ReSharper disable NotAccessedField.Local
// ReSharper disable UnusedAutoPropertyAccessor.Local
// ReSharper disable CheckNamespace
// ReSharper disable AutoPropertyCanBeMadeGetOnly.Local
// ReSharper disable RedundantDefaultMemberInitializer

namespace DTS.Viewer.ChartOptions
{
    public class ChartOptionsViewModel : BaseViewModel<IChartOptionsViewModel>, IChartOptionsViewModel
    {
        public IBaseViewModel Parent { get; set; }
        private IEventAggregator _eventAggregator { get; set; }
        private IUnityContainer _unityContainer { get; set; }
        public InteractionRequest<Notification> NotificationRequest { get; private set; }
        public new InteractionRequest<Confirmation> ConfirmationRequest { get; private set; }
        public IBaseView View { get; set; }

        private IChartOptionsModel _model;
        public new IChartOptionsModel Model { get => _model; set { _model = value; OnPropertyChanged("Model"); } }

        /// <summary>
        /// Creates a new instance of the TestSummaryViewModel.
        /// </summary>
        /// <param name="view">The TestListView interface.</param>
        /// <param name="regionManager">The logical placeholder defined within the application's UI (in the shell or within views) into which views are displayed.</param>
        /// <param name="eventAggregator">The EventAggregator which allows different components to publish/subscribe to events without being coupled to each other.</param>
        /// <param name="unityContainer">The unityContainer.</param>
        public ChartOptionsViewModel(IChartOptionsView view, IRegionManager regionManager, IEventAggregator eventAggregator, IUnityContainer unityContainer)
            : base(regionManager, eventAggregator, unityContainer)
        {
            View = view;
            View.DataContext = this;
            NotificationRequest = new InteractionRequest<Notification>();
            ConfirmationRequest = new InteractionRequest<Confirmation>();

            _eventAggregator = eventAggregator;
            _unityContainer = unityContainer;
            _eventAggregator.GetEvent<ChartAxisChangedEvent>().Subscribe(OnChartAxisChangedEvent);

            //Model = _unityContainer.Resolve<IChartOptionsModel>();
            //Model.Parent = this;
            //View.DataContext = Model;
        }
        public override void Initialize()
        {

        }

        private string chartType = string.Empty;
        public override void Initialize(object parameter)
        {
            Subscribe();
            Model = _unityContainer.Resolve<IChartOptionsModel>();
            Model.Parent = this;
            View.DataContext = Model;
            if (parameter is IViewerMainViewModel)
            {
                Parent = (IBaseViewModel)parameter;
                Model.DecimateData = true;
            }
            else if (parameter is Tuple<IBaseViewModel, string> tuParam && tuParam.Item1 is IPSDReportMainViewModel)
            {
                Parent = tuParam.Item1;
                chartType = tuParam.Item2;
                Model.CanPublishChanges = false;
                if ("Graph" == chartType)
                {
                    Model.UnitType = ChartUnitTypeEnum.PSD;
                    Model.YRange = YRangeScaleEnum.Fixed;
                    Model.MaxFixedY = 1;
                    Model.MinFixedY = 1e-12; //log scale, can't be 0
                    Model.DecimateData = false;
                }
                else
                {
                    Model.DecimateData = true;
                    Model.Filter = FilterOptionEnum.Unfiltered;
                }
                Model.CanPublishChanges = true;
            }
        }

        private void Subscribe()
        {
            _eventAggregator.GetEvent<CursorsAlailableChangedEvent>().Subscribe(OnCursorsAlailableChanged);
            _eventAggregator.GetEvent<GraphSelectedChannelsNotification>().Subscribe(OnGraphSelectedChannelsChanged);
        }

        private string Directory { get; set; }

        private void OnGraphSelectedChannelsChanged(GraphSelectedChannelsNotificationArg arg)
        {
            if (Parent != arg?.ParentVM) return;
            var channels = arg.SelectedChannels;
            Model.Parent = this;
            Directory = channels.Count > 0 ? channels[0].BinaryFilePath : string.Empty;
            ChartOptionsVisability = (channels.Count > 0);
            //whenever channels change, check the status of mV/ADC buttons
            //18256 Implement StackChannelScaleFactorsEUPerADC Arm/Event Command
            if (AllChannelsSupportADC(channels))
            {
                Model.SupportsADC = true;
            }
            else
            {
                Model.SupportsADC = false;
                if (Model.UnitType == ChartUnitTypeEnum.ADC)
                {
                    Model.UnitType = ChartUnitTypeEnum.EU;
                }
            }
            if (AllChannelsSupportmV(channels))
            {
                Model.SupportsMV = true;
            }
            else
            {
                Model.SupportsMV = false;
                if (Model.UnitType == ChartUnitTypeEnum.mV)
                {
                    Model.UnitType = ChartUnitTypeEnum.EU;
                }
            }

            PublishChanges();
        }
        /// <summary>
		/// returns true if all channels support ADC
        /// for now this is determined by looking at the sensor serial number, but we
        /// can be more sophisticated in the future, as there are other channels that won't support ADC meaningfully as well
        /// (like calculated channels)
		/// </summary>
        private bool AllChannelsSupportADC(List<ITestChannel> channels)
        {
            return !channels.Exists(x => Common.Enums.Hardware.HardwareConstants.IsTSRAIRSerialNumber(x.ParentModule.BaseSerialNumber));
        }
		/// <summary>
		/// returns true if all channels support mV
		/// </summary>
        private bool AllChannelsSupportmV(List<ITestChannel> channels)
        {
            return !channels.Exists(x => Common.Enums.Hardware.HardwareConstants.IsTSRAIRSerialNumber(x.ParentModule.BaseSerialNumber));
        }

        private void OnCursorsAlailableChanged(bool value)
        {
            Model.IsCursorsAvailable = value;
        }

        private void OnChartAxisChangedEvent(ChartAxisChangedEventArg args)
        {
            if (args?.ParentVM != Parent) return;
            Model.CanPublishChanges = false;
            switch (args.Axis)
            {
                case "Y":
                    Model.MinFixedY = args.MinValue;
                    Model.MaxFixedY = args.MaxValue;
                    break;
                case "X":
                    Model.MinFixedT = args.MinValue;
                    Model.MaxFixedT = args.MaxValue;
                    break;
            }
            Model.CanPublishChanges = true;
        }

        #region Properties

        public object ContextSearchRegion { get; set; }
        public new bool IsMenuIncluded { get; set; }
        public new bool IsNavigationIncluded { get; set; }
        public new bool IsBusy { get; set; }
        public new bool IsDirty { get; }

        private bool _chartOptionsVisability = false;
        public bool ChartOptionsVisability { get => _chartOptionsVisability; set { _chartOptionsVisability = value; OnPropertyChanged("ChartOptionsVisability"); } }

        public new event PropertyChangedEventHandler PropertyChanged;

        public new void OnPropertyChanged(string propertyName)
        {
            var handler = PropertyChanged;
            handler?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
        #endregion Properties

        #region Methods
        public void ShowMinMaxCursor(bool value)
        {
            _eventAggregator.GetEvent<CursorShowMinMaxChangedEvent>().Publish(value);
        }
        public void ResetZoomMethod()
        {
            Model.YRange = YRangeScaleEnum.AutoRange;
            _eventAggregator.GetEvent<ResetZoomChangedEvent>().Publish(true);
        }
        public void ResetTMethod()
        {
            _eventAggregator.GetEvent<ResetZoomChangedEvent>().Publish(false);
        }
        public void SaveToPDFMethod()
        {
            _eventAggregator.GetEvent<SaveToPDFRequestedEvent>().Publish(Directory);
        }
        public void PublishChanges()
        {
            _eventAggregator.GetEvent<ChartOptionsChangedEvent>().Publish(new ChartOptionsChangedEventArg() { ParentVM = Parent, Model = Model, ChartType = chartType });
        }
        public void ShowCusor(bool value)
        {
            _eventAggregator.GetEvent<CursorShowChangedEvent>().Publish(value);
        }
        
        #endregion Methods

        #region Commands

        private DelegateCommand _clearMarkersCommand;
        public DelegateCommand ClearMarkersCommand => _clearMarkersCommand ?? (_clearMarkersCommand = new DelegateCommand(ClearMarkersMethod));
        private void ClearMarkersMethod()
        {
            _eventAggregator.GetEvent<CursorsClearChangedEvent>().Publish(true);
        }

        #endregion
    }
}