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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tango.BL;
using Tango.Core.DI;
using Tango.PPC.Common.Application;
using Tango.PPC.Common.Authentication;
using Tango.PPC.Common.Connection;
using Tango.PPC.Common.Connectivity;
using Tango.PPC.Common.EventLogging;
using Tango.PPC.Common.ExternalBridge;
using Tango.PPC.Common.HotSpot;
using Tango.PPC.Common.Navigation;
using Tango.PPC.Common.Notifications;
using Tango.PPC.Common.Printing;
using Tango.PPC.Common.RemoteAssistance;
using Tango.PPC.Common.Storage;
using Tango.Settings;
using Tango.SharedUI;
using static Tango.SharedUI.Controls.NavigationControl;

namespace Tango.PPC.Common
{
    /// <summary>
    /// Represents a PPC view model base class.
    /// </summary>
    /// <seealso cref="Tango.SharedUI.ViewModel" />
    public abstract class PPCViewModel : ViewModel, INavigationViewModel, INavigationBlocker
    {
        /// <summary>
        /// Gets the static observable entities adapter.
        /// </summary>
        public ObservablesStaticCollections Adapter
        {
            get { return ObservablesStaticCollections.Instance; }
        }

        /// <summary>
        /// Gets or sets the application manager.
        /// </summary>
        [TangoInject]
        public IPPCApplicationManager ApplicationManager { get; set; }

        /// <summary>
        /// Gets or sets the authentication provider.
        /// </summary>
        [TangoInject]
        public IAuthenticationProvider AuthenticationProvider { get; set; }

        /// <summary>
        /// Gets or sets the navigation manager.
        /// </summary>
        [TangoInject]
        public INavigationManager NavigationManager { get; set; }

        /// <summary>
        /// Gets or sets the notification provider.
        /// </summary>
        [TangoInject]
        public INotificationProvider NotificationProvider { get; set; }

        /// <summary>
        /// Gets or sets the machine provider.
        /// </summary>
        [TangoInject]
        public IMachineProvider MachineProvider { get; set; }

        /// <summary>
        /// Gets or sets the external bridge service.
        /// </summary>
        [TangoInject]
        public IPPCExternalBridgeService ExternalBridgeService { get; set; }

        /// <summary>
        /// Gets or sets the printing manager.
        /// </summary>
        [TangoInject]
        public IPrintingManager PrintingManager { get; set; }

        /// <summary>
        /// Gets or sets the connectivity provider.
        /// </summary>
        [TangoInject]
        public IConnectivityProvider ConnectivityProvider { get; set; }

        /// <summary>
        /// Gets or sets the hot spot provider.
        /// </summary>
        [TangoInject]
        public IHotSpotProvider HotSpotProvider { get; set; }

        /// <summary>
        /// Gets or sets the remote assistance provider.
        /// </summary>
        [TangoInject]
        public IRemoteAssistanceProvider RemoteAssistanceProvider { get; set; }

        /// <summary>
        /// Gets or sets the storage provider.
        /// </summary>
        [TangoInject]
        public IStorageProvider StorageProvider { get; set; }

        /// <summary>
        /// Gets or sets the event logger.
        /// </summary>
        [TangoInject]
        public IEventLogger EventLogger { get; set; }

        private PPCSettings _settings;
        /// <summary>
        /// Gets the main PPC settings.
        /// </summary>
        public PPCSettings Settings
        {
            get
            {
                if (_settings == null)
                {
                    _settings = SettingsManager.Default.GetOrCreate<PPCSettings>();
                }

                return _settings;
            }
            private set { _settings = value; }
        }

        private bool _isVisible;
        /// <summary>
        /// Gets or sets a value indicating whether this <see cref="PPCViewModel"/> view is visible.
        /// </summary>
        public bool IsVisible
        {
            get { return _isVisible; }
            private set { _isVisible = value; RaisePropertyChangedAuto(); }
        }

        /// <summary>
        /// Called when the application has been started.
        /// </summary>
        public abstract void OnApplicationStarted();

        /// <summary>
        /// Called when the application is shutting down.
        /// </summary>
        public virtual void OnApplicationShuttingDown()
        {

        }

        /// <summary>
        /// Called when the navigation system has navigated to this VM view.
        /// </summary>
        public virtual void OnNavigatedTo()
        {
            IsVisible = true;
        }

        /// <summary>
        /// Called when the navigation system has navigated from this VM view.
        /// </summary>
        public virtual void OnNavigatedFrom()
        {
            IsVisible = false;
        }

        /// <summary>
        /// Raises the specified message using the default <see cref="TangoMessenger"/>.
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="message">The message.</param>
        protected void RaiseMessage<T>(T message) where T : class
        {
            TangoMessenger.Default.Send<T>(message);
        }

        /// <summary>
        /// Registers a message handle for the specified message type T.
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="handler">The handler.</param>
        protected void RegisterForMessage<T>(Action<T> handler)
        {
            TangoMessenger.Default.Register<T>(handler);
        }

        /// <summary>
        /// Called before the navigation system navigates from this object.
        /// Return false to abort the navigation.
        /// </summary>
        /// <returns></returns>
        public virtual Task<bool> OnNavigateOutRequest()
        {
            return Task.FromResult(true);
        }

        /// <summary>
        /// Called before the navigation system navigates back from this object.
        /// Return false to abort the navigation.
        /// </summary>
        /// <returns></returns>
        public virtual Task<bool> OnNavigateBackRequest()
        {
            return Task.FromResult(true);
        }

        /// <summary>
        /// Called when the application is ready and all modules views are loaded.
        /// </summary>
        public virtual void OnApplicationReady()
        {
            
        }
    }

    /// <summary>
    /// Represents a PPC view model base class a View property as an instance of a <see cref="IPPCView"/> contract.
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <seealso cref="Tango.SharedUI.ViewModel" />
    public abstract class PPCViewModel<T> : PPCViewModel where T : IPPCView
    {
        private T _view;
        /// <summary>
        /// Gets the IPPCView instance.
        /// </summary>
        [TangoInject(TangoInjectMode.WhenAvailable)]
        public T View
        {
            get { return _view; }
            set
            {
                _view = value;
                ViewAttached = true;
                OnViewAttached();
            }
        }


        /// <summary>
        /// Gets a value indicating whether the instance of IPPCView is available.
        /// </summary>
        public bool ViewAttached { get; private set; }

        /// <summary>
        /// Called when the application has been started.
        /// </summary>
        public override void OnApplicationStarted()
        {

        }

        /// <summary>
        /// Called when the instance of IPPCView is available.
        /// </summary>
        public virtual void OnViewAttached()
        {

        }
    }
}