using System;
using System.ComponentModel;
using System.Threading.Tasks;
using DTS.Common.Base;
using DTS.Common.Events;
using DTS.Common.Interface;
using Microsoft.Practices.Prism.Events;
using Microsoft.Practices.Prism.Interactivity.InteractionRequest;
using Microsoft.Practices.Prism.Regions;
using Microsoft.Practices.Unity;

namespace DTS.Viewer
{
    public class NavigationViewModel : BaseViewModel<INavigationViewModel>, INavigationViewModel
    {
        public INavigationView NavigationView { get; private set; }
        private IShellViewModel Parent { get; set; }

        private IEventAggregator EventAggregator { get; set; }
        private IRegionManager _regionManager;
        private IUnityContainer UnityContainer { get; set; }
        public InteractionRequest<Notification> NotificationRequest { get; private set; }
        public InteractionRequest<Confirmation> ConfirmationRequest { get; private set; }

        /// <summary>
        /// Creates a new instance of the TechnologyDoFrontEditViewModel.
        /// </summary>
        /// <param name="view">The NavigationView View.</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 NavigationViewModel(INavigationView view, IRegionManager regionManager, IEventAggregator eventAggregator, IUnityContainer unityContainer)
            : base(regionManager, eventAggregator, unityContainer)
        {
            NavigationView = view;
            NavigationView.DataContext = this;
            NotificationRequest = new InteractionRequest<Notification>();
            ConfirmationRequest = new InteractionRequest<Confirmation>();

            EventAggregator = eventAggregator;
            UnityContainer = unityContainer;
            _regionManager = regionManager;
            EventAggregator.GetEvent<RaiseNotification>().Subscribe(OnRaiseNotification);
        }

        public override void Initialize()
        {
            
        }

        public override void Initialize(object parameter)
        {
            Parent = (IShellViewModel)parameter;

        }

        #region Methods

        /// <summary>
        /// Private Event handler for RaiseNotification event.
        /// </summary>
        private void OnRaiseNotification(NotificationContentEventArgs eventArgsWithTitle)
        {
            // Notification object expects a NotificationContentEventArgsWithoutTitle object and a Title string.
            var eventArgsWithoutTitle = new NotificationContentEventArgs(eventArgsWithTitle.Message, eventArgsWithTitle.MessageDetails, eventArgsWithTitle.Image);

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

        /// <summary>
        /// Get all regions in the view
        /// </summary>
        /// <returns></returns>
        //public List<FrameworkElement> GetRegions()
        //{

        //    var items = new List<FrameworkElement>();
        //    Utils.GetChildrenByName(((NavigationView)NavigationView).FrontShell, "Region", ref items);
        //    return items;
        //}


        #endregion

        #region ContextRegion
        
        public object ContextNavigationRegion 
        {
            get { return ((NavigationView)NavigationView).NavigationRegion.Content; }
            set { ((NavigationView)NavigationView).NavigationRegion.Content = value; OnPropertyChanged("ContextNavigationRegion"); }
        }

        #endregion

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

        private new void OnPropertyChanged(string propertyName)
        {
            var eventHandler = PropertyChanged;
            if (eventHandler != null)
            {
                eventHandler(this, new PropertyChangedEventArgs(propertyName));
            }
        }
        #region Properties


        /// <summary>
        /// Gets the HeaderInfo.
        /// </summary>
        public string HeaderInfo
        {
            get { return "NavigationRegion"; }
        }

        #endregion

        public new bool IsBusy
        {
            get { throw new NotImplementedException(); }
            set { throw new NotImplementedException(); }
        }

        public override void Activated()
        {
            throw new NotImplementedException();
        }

        public new bool IsDirty
        {
            get { throw new NotImplementedException(); }
        }

        public override void Cleanup()
        {
            throw new NotImplementedException();
        }

        public new Task CleanupAsync()
        {
            throw new NotImplementedException();
        }

        public override Task InitializeAsync()
        {
            throw new NotImplementedException();
        }

        public override Task InitializeAsync(object parameter)
        {
            throw new NotImplementedException();
        }
    }
}