using DTS.Common.Base;
using DTS.Common.Events;
using DTS.Common.Interactivity;
using DTS.Common.Interface;
using DTS.Common.Utils;
using Prism.Commands;
using Prism.Events;
using Prism.Regions;
using System.Collections.ObjectModel;
using System.Threading.Tasks;
using Unity;

namespace DTS.Viewer.PSDReportResults
{
    public class PSDReportResultsViewModel : BaseViewModel<IPSDReportResultsViewModel>, IPSDReportResultsViewModel
    {
        #region properties / fields
        public IBaseView View { get; set; }
        public IBaseViewModel Parent { get; set; }
        public ObservableCollection<IChannelGRMSSummary> Results { get; set; }
        private string Directory { get; set; }
        private IEventAggregator _eventAggregator { get; set; }
        private new IRegionManager _regionManager { get; set; }
        private IUnityContainer _unityContainer { get; set; }

        public InteractionRequest<Notification> NotificationRequest { get; private set; }
        public new InteractionRequest<Confirmation> ConfirmationRequest { get; private set; }
        #endregion

        /// <summary>
        /// Creates a new instance of the MainViewModel.
        /// </summary>

        /// <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 Unity container.</param>
        public PSDReportResultsViewModel(IPSDReportSettingsView 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;
            _regionManager = regionManager;
        }

        public override void Initialize(object parameter)
        {
            Parent = (IBaseViewModel)parameter;
            Results = new ObservableCollection<IChannelGRMSSummary>();
            Subscribe();
        }

        private void Subscribe()
        {
            _eventAggregator.GetEvent<PSDReportGRMSValuesUpdatedEvent>().Subscribe(OnGRMSValuesUpdated, ThreadOption.UIThread);
            _eventAggregator.GetEvent<GraphSelectedChannelsNotification>().Subscribe(OnGraphSelectedChannelsChanged);
        }

        private void OnGRMSValuesUpdated(PSDReportGRMSValuesUpdatedEventArg arg)
        {
            if (Parent != arg.ParentVM) return;
            Results.Clear();
            foreach (var val in arg.Values)
            {
                Results.Add(val);
            }
        }
        private void OnGraphSelectedChannelsChanged(GraphSelectedChannelsNotificationArg arg)
        {
            if (Parent != arg?.ParentVM) return;
            var channels = arg?.SelectedChannels ?? new System.Collections.Generic.List<ITestChannel>();

            Directory = channels.Count > 0 ? channels[0].BinaryFilePath.ReplaceLast("Binary", "Reports") : string.Empty;
        }

        private DelegateCommand _exportToPDFCommand;
        public DelegateCommand ExportToPDFCommand => _exportToPDFCommand ?? (_exportToPDFCommand = new DelegateCommand(ExportToPDFMethod));
        private void ExportToPDFMethod()
        {
            _eventAggregator.GetEvent<SaveReportToPDFRequestedEvent>().Publish(new SaveReportToPDFRequestedEventArgs() { Directory = Directory, ParentVM = Parent });
        }

        private DelegateCommand _exportToCSVCommand;
        public DelegateCommand ExportToCSVCommand => _exportToCSVCommand ?? (_exportToCSVCommand = new DelegateCommand(ExportToCSVMethod));

        private void ExportToCSVMethod()
        {
            _eventAggregator.GetEvent<SaveReportToCSVRequestedEvent>().Publish(new SaveReportToCSVRequestedEventArgs() { Directory = Directory, ParentVM = Parent });
        }
    }
}