using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.ComponentModel.Composition;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Data;
using DTS.Common.Events;
using DTS.Common.Events.TTSImport;
using DTS.Common.Interface.DataRecorders;
using DTS.Common.Interface.TestSetups.Imports.TTS.DOChannels;
using DTS.Common.Interface.TestSetups.Imports.TTS.ReadFile;
using Prism.Events;
using Unity;
using DTS.Common.Interactivity;
using Prism.Regions;
using Prism.Commands;
using TTSImport.Model;
using TTSImport.Resources;

// ReSharper disable CheckNamespace
// ReSharper disable MemberCanBePrivate.Global
// ReSharper disable InconsistentNaming

namespace TTSImport
{
    /// <summary>
    /// this class handles Level Trigger edit/create functionality
    /// </summary>
    [PartCreationPolicy(CreationPolicy.Shared)]
    public class DigitalOutputChannelsViewModel : IDigitalOutputChannelsViewModel
    {
        /// <summary>
        /// The Hardware Scan view
        /// </summary>
        public IDigitalOutputChannelsView View { get; set; }

        private IEventAggregator _eventAggregator { get; }
        private IRegionManager _regionManager;
        private IUnityContainer UnityContainer { get; }

        public InteractionRequest<Notification> NotificationRequest { get; }
        public InteractionRequest<Confirmation> ConfirmationRequest { get; }

        /// <summary>
        /// Creates a new instance of the TechnologyDomainEditViewModel.
        /// </summary>
        /// <param name="view">The IDigitalOutputChannelsView.</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 DigitalOutputChannelsViewModel(IDigitalOutputChannelsView view, IRegionManager regionManager,
            IEventAggregator eventAggregator, IUnityContainer unityContainer)
        {
            View = view;
            View.DataContext = this;

            NotificationRequest = new InteractionRequest<Notification>();
            ConfirmationRequest = new InteractionRequest<Confirmation>();

            _eventAggregator = eventAggregator;
            UnityContainer = unityContainer;
            _regionManager = regionManager;
            _eventAggregator.GetEvent<RaiseNotification>().Subscribe(OnRaiseNotification);
            _eventAggregator.GetEvent<BusyIndicatorChangeNotification>()
                .Subscribe(OnBusyIndicatorNotification, ThreadOption.PublisherThread, true);
            _eventAggregator.GetEvent<AssignedChannelsChangedEvent>().Subscribe(OnAssignedChannelsChangedEvent,
                ThreadOption.PublisherThread, true);
            _eventAggregator.GetEvent<TTSImportHardwareScanFinishedEvent>()
                .Subscribe(OnHardwareScanComplete, ThreadOption.PublisherThread, true);
            _eventAggregator.GetEvent<EIDMappingEvent>()
                .Subscribe(OnEIDComplete, ThreadOption.PublisherThread, true);
        }

        #region Methods
        private void OnEIDComplete(IDictionary<string, string> sensorIdToChannelId)
        {
            var channelIdToSensorId = new Dictionary<string, string>();
            using (var e = sensorIdToChannelId.GetEnumerator())
            {
                while (e.MoveNext())
                {
                    channelIdToSensorId[e.Current.Value] = e.Current.Key;
                }
            }
            _hardwareChannelIdToSensorId = channelIdToSensorId;
        }
        private void OnHardwareScanComplete(List<IDASHardware> hardware)
        {
            _hardware = hardware;
        }

        private void OnAssignedChannelsChangedEvent(ITTSSetup setup)
        {
            if (!Application.Current.Dispatcher.CheckAccess())
            {
                Application.Current.Dispatcher.BeginInvoke(new Action(() =>
                {
                    OnAssignedChannelsChangedEvent(setup);
                }));
                return;
            }
            _setup = setup;
            if (null == _hardware || null == _setup) { return; }
            var channels = new ObservableCollection<DASChannel>();
            var channelIdToChannelRecord = new Dictionary<string, ITTSChannelRecord>();
            foreach (var ch in _setup.Channels)
            {
                if (!ch.IsDigitalOutput) { continue; }
                if (null == ch.HardwareChannel) { continue; }
                if (ch.ChannelCode == TTSChannelRecord.NONE) { continue; }
                channelIdToChannelRecord[ch.HardwareChannel.GetId()] = ch;
            }
            var channelIdToDASChannel = new Dictionary<string, DASChannel>();
            foreach (var das in _hardware)
            {
                var ichannels = das.GetIHardwareChannels();
                foreach (var ch in ichannels)
                {
                    if (!ch.IsDigitalOut) { continue; }
                    var newChannel = new DASChannel(ch, _setup);
                    if (_hardwareChannelIdToSensorId.ContainsKey(ch.GetId()))
                    {
                        newChannel.EID = _hardwareChannelIdToSensorId[ch.GetId()];
                    }
                    channels.Add(newChannel);
                    channelIdToDASChannel[newChannel.HardwareChannel.GetId()] = newChannel;
                    if (channelIdToChannelRecord.ContainsKey(ch.GetId()))
                    {
                        newChannel.SetITTSChannelRecord(channelIdToChannelRecord[ch.GetId()]);
                        newChannel.Channel.ChannelCode = $"Digital Out {ch.ToString()}";
                        newChannel.Channel.SensorSerialNumber = newChannel.Channel.ChannelCode;
                    }
                }
            }

            using (var enumChannels = channelIdToDASChannel.GetEnumerator())
            {
                while (enumChannels.MoveNext())
                {
                    if (null == enumChannels.Current.Value.Channel)
                    {
                        //CREATE new channel
                        var ch = new TTSChannelRecord();
                        ch.ChannelCode = $"Digital Out {enumChannels.Current.Value.HardwareChannel?.ToString()}";
                        ch.IsChannelCodeValid = true;
                        ch.IsDigitalOutput = true;
                        ch.SensorEU = "V";
                        ch.HardwareChannel = enumChannels.Current.Value.HardwareChannel;
                        //ch.SensorSerialNumber = ch.ChannelCode;
                        enumChannels.Current.Value.SetITTSChannelRecord(ch);
                    }
                }
            }

            DASChannels = channels;
            OnPropertyChanged("DASChannels");
            CollectionViewSource.GetDefaultView(DASChannels)?.Refresh();
        }
        public void Cleanup()
        {
        }

        public Task CleanupAsync()
        {
            return Task.CompletedTask;
        }

        public void Initialize()
        {
        }

        public void Initialize(object parameter)
        {
        }

        public void Initialize(object parameter, object model)
        {
        }

        public Task InitializeAsync()
        {
            return Task.CompletedTask;
        }

        public Task InitializeAsync(object parameter)
        {
            return Task.CompletedTask;
        }

        public void Activated()
        {
        }

        /// <summary>
        /// Private Event handler for RaiseNotification event.
        /// </summary>
        private void OnBusyIndicatorNotification(bool eventArg)
        {
            IsBusy = eventArg;
        }

        /// <summary>
        /// Private Event handler for RaiseNotification event.
        /// </summary>
        private void OnRaiseNotification(NotificationContentEventArgs eventArgsWithTitle)
        {
            // The NotificationRequest.Raise triggers the Invoke() method of the PopupWindowAction object to show the NotificationWindow window
            // Notification object expects a NotificationContentEventArgsWithoutTitle object and a Title string.
            var eventArgsWithoutTitle = new NotificationContentEventArgs(eventArgsWithTitle.Message, "",
                eventArgsWithTitle.Image, string.Empty);

            NotificationRequest.Raise(new Notification
            {
                Content = eventArgsWithoutTitle,
                Title = eventArgsWithTitle.Title
            });
        }

        #endregion

        #region Properties
        private ITTSSetup _setup;
        private IList<IDASHardware> _hardware;
        private IDictionary<string, string> _hardwareChannelIdToSensorId = new Dictionary<string, string>();
        public bool IsDirty { get; private set; }
        private bool _isBusy;

        public bool IsBusy
        {
            get => _isBusy;
            set
            {
                _isBusy = value;
                OnPropertyChanged("IsBusy");
            }
        }

        private bool _isMenuIncluded;

        public bool IsMenuIncluded
        {
            get => _isMenuIncluded;
            set
            {
                _isMenuIncluded = value;
                OnPropertyChanged("IsMenuIncluded");
            }
        }

        private bool _isNavigationIncluded;

        public bool IsNavigationIncluded
        {
            get => _isNavigationIncluded;
            set
            {
                _isNavigationIncluded = value;
                OnPropertyChanged("IsNavigationIncluded");
            }
        }
        public ObservableCollection<DASChannel> DASChannels { get; set; } = new ObservableCollection<DASChannel>();

        private DASChannel _selectedDASChannel;
        public DASChannel SelectedDASChannel
        {
            get => _selectedDASChannel;
            set => _selectedDASChannel = value;
        }

        public string EnableOrDisableText
        {
            get
            {
                if (SelectedDASChannel?.Channel == null)
                {
                    return StringResources.Analog_Enable;
                }
                return SelectedDASChannel.Channel.Disabled
                    ? StringResources.Analog_Enable
                    : StringResources.Analog_Disable;
            }
        }
        #endregion Properties

        #region Commands

        #endregion

        /// <inheritdoc />
        /// <summary>
        /// Occurs when a property value changes.
        /// </summary>
        public event PropertyChangedEventHandler PropertyChanged;

        public void OnPropertyChanged(string propertyName)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}