using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Linq.Expressions;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Input;
using System.Windows.Media;
using Tango.BL;
using Tango.Core.DI;
using Tango.FSE.BL;
using Tango.FSE.Common.Authentication;
using Tango.FSE.Common.Connection;
using Tango.FSE.Common.Diagnostics;
using Tango.FSE.Common.FileSystem;
using Tango.FSE.Common.FSEApplication;
using Tango.FSE.Common.Logging;
using Tango.FSE.Common.Navigation;
using Tango.FSE.Common.Notifications;
using Tango.FSE.Common.Performance;
using Tango.FSE.Common.MachineUpdates;
using Tango.FSE.Common.RemoteDesktop;
using Tango.FSE.Common.Resolution;
using Tango.FSE.Common.Storage;
using Tango.FSE.Common.SystemInfo;
using Tango.Settings;
using Tango.SharedUI;
using static Tango.SharedUI.Controls.NavigationControl;
using Tango.FSE.BL.Connectivity;
using Tango.FSE.Common.BugReporting;
using Tango.FSE.Common.RemoteUpgrade;
using Tango.FSE.Common.AutoComplete;
using Tango.BL.Entities;
using Tango.FSE.Common.Firmware;
using Tango.FSE.Common.Threading;
using Tango.FSE.Common.Events;
using Tango.FSE.Common.Tiles;
using Tango.FSE.Common.RemoteJob;
using Tango.FSE.Common.WindowsManager;
using Tango.FSE.Common.DemoMode;
using Tango.FSE.Common.FileAssociation;
using Tango.FSE.Common.Insights;
using Tango.FSE.Common.Build;
using Tango.FSE.Common.Statistics;

namespace Tango.FSE.Common
{
    /// <summary>
    /// Represents a FSE view model base class.
    /// </summary>
    /// <seealso cref="Tango.SharedUI.ViewModel" />
    public abstract class FSEViewModel : ViewModel, 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 IFSEApplicationManager ApplicationManager { get; set; }

        private IAuthenticationProvider _authenticationProvider;
        /// <summary>
        /// Gets or sets the authentication provider.
        /// </summary>
        [TangoInject]
        public IAuthenticationProvider AuthenticationProvider
        {
            get { return _authenticationProvider; }
            set
            {
                _authenticationProvider = value;
                RaisePropertyChangedAuto();
                if (_authenticationProvider != null)
                {
                    _authenticationProvider.CurrentUserChanged += OnCurrentUserChanged;
                }
            }
        }


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

        private INotificationProvider _notificationProvider;
        /// <summary>
        /// Gets or sets the notification provider.
        /// </summary>
        [TangoInject]
        public INotificationProvider NotificationProvider
        {
            get { return _notificationProvider; }
            set { _notificationProvider = value; RaisePropertyChangedAuto(); }
        }

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

        /// <summary>
        /// Gets or sets the diagnostics provider.
        /// </summary>
        [TangoInject]
        public IDiagnosticsProvider DiagnosticsProvider { get; set; }

        /// <summary>
        /// Gets or sets the remote desktop provider.
        /// </summary>
        [TangoInject]
        public IRemoteDesktopProvider RemoteDesktopProvider { get; set; }

        /// <summary>
        /// Gets or sets the performance provider.
        /// </summary>
        [TangoInject]
        public IPerformanceProvider PerformanceProvider { get; set; }

        /// <summary>
        /// Gets or sets the system information provider.
        /// </summary>
        [TangoInject]
        public ISystemInfoProvider SystemInfoProvider { get; set; }

        /// <summary>
        /// Gets or sets the logging provider.
        /// </summary>
        [TangoInject]
        public ILoggingProvider LoggingProvider { get; set; }

        private IResolutionService _resolutionService;
        /// <summary>
        /// Gets or sets the resolution service.
        /// </summary>
        [TangoInject]
        public IResolutionService ResolutionService
        {
            get { return _resolutionService; }
            set { _resolutionService = value; RaisePropertyChangedAuto(); }
        }

        /// <summary>
        /// Gets or sets the file system provider.
        /// </summary>
        [TangoInject]
        public IFileSystemProvider FileSystemProvider { get; set; }

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

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

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

        /// <summary>
        /// Gets or sets the bug reporter.
        /// </summary>
        [TangoInject]
        public IBugReporter BugReporter { get; set; }

        /// <summary>
        /// Gets or sets the remote upgrade manager.
        /// </summary>
        [TangoInject]
        public IRemoteUpgradeManager RemoteUpgradeManager { get; set; }

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

        /// <summary>
        /// Gets or sets the UI dispatcher provider.
        /// </summary>
        [TangoInject]
        public IDispatcherProvider DispatcherProvider { get; set; }

        /// <summary>
        /// Gets or sets the events provider.
        /// </summary>
        [TangoInject]
        public IEventsProvider EventsProvider { get; set; }

        /// <summary>
        /// Gets or sets the remote job provider.
        /// </summary>
        [TangoInject]
        public IRemoteJobProvider RemoteJobProvider { get; set; }

        /// <summary>
        /// Gets or sets the dashboard manager.
        /// </summary>
        [TangoInject]
        public IDashboardManager DashboardManager { get; set; }

        /// <summary>
        /// Gets or sets the windows manager.
        /// </summary>
        [TangoInject]
        public IWindowsManager WindowsManager { get; set; }

        /// <summary>
        /// Gets or sets the demo mode manager.
        /// </summary>
        [TangoInject]
        public IDemoModeManager DemoModeManager { get; set; }

        /// <summary>
        /// Gets or sets the file association provider.
        /// </summary>
        [TangoInject]
        public IFileAssociationProvider FileAssociationProvider { get; set; }

        /// <summary>
        /// Gets or sets the insights provider.
        /// </summary>
        [TangoInject]
        public IInsightsProvider InsightsProvider { get; set; }

        /// <summary>
        /// Gets or sets the cryptography provider.
        /// </summary>
        [TangoInject]
        public ICryptographyProvider CryptographyProvider { get; set; }

        /// <summary>
        /// Gets or sets the current build provider.
        /// </summary>
        [TangoInject]
        public IBuildProvider BuildProvider { get; set; }

        /// <summary>
        /// Gets or sets the statistics data provider.
        /// </summary>
        [TangoInject]
        public IStatisticsProvider StatisticsProvider { get; set; }

        /// <summary>
        /// Gets or sets the FSE service.
        /// </summary>
        [TangoInject]
        public FSEServicesContainer Services { get; set; }

        /// <summary>
        /// Gets or sets the machines automatic complete provider.
        /// </summary>
        public AutoCompleteSource<Machine> MachinesAutoCompleteProvider { get; set; }

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

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

        /// <summary>
        /// Gets the current user.
        /// </summary>
        public User CurrentUser
        {
            get { return AuthenticationProvider.CurrentUser; }
        }


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

        /// <summary>
        /// Initializes a new instance of the <see cref="FSEViewModel"/> class.
        /// </summary>
        public FSEViewModel()
        {
            MachinesAutoCompleteProvider = new AutoCompleteSource<Machine>(AutoCompleteMachines);
        }

        private List<Machine> AutoCompleteMachines(string key)
        {
            key = key ?? String.Empty;

            try
            {
                return Services.MachinesService.GetAllMachines().Result.Where(x => x.SerialNumber.ToLower().StartsWith(key.ToLower())).Take(8).ToList();
            }
            catch (Exception ex)
            {
                LogManager.Log(ex, "Error on auto complete machine filter.");
                return new List<Machine>();
            }
        }

        /// <summary>
        /// Called when the application has been started.
        /// </summary>
        public virtual 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 to this VM view.
        /// </summary>
        /// <param name="fromVM">The view model instance of the previous view model</param>
        public virtual void OnNavigatedTo(FSEViewModel fromVM)
        {

        }

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

        /// <summary>
        /// Called before the navigation system has navigated to this VM view.
        /// </summary>
        public virtual void OnBeforeNavigatedTo()
        {

        }

        /// <summary>
        /// Called before the navigation system has navigated from this VM view.
        /// </summary>
        public virtual void OnBeforeNavigatedFrom()
        {
            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>
        /// Raises the specified message using the default <see cref="TangoMessenger"/>.
        /// </summary>
        /// <typeparam name="T"></typeparam>
        protected void RaiseMessage<T>() where T : class
        {
            TangoMessenger.Default.Send<T>(Activator.CreateInstance<T>());
        }

        /// <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>
        /// Called when the current user has logged out of the application.
        /// </summary>
        public virtual Task<bool> OnApplicationLogout()
        {
            return Task.FromResult(true);
        }

        /// <summary>
        /// Raises the property changed event.
        /// </summary>
        /// <param name="caller"></param>
        protected override void RaisePropertyChangedAuto([CallerMemberName] string caller = null)
        {
            base.RaisePropertyChangedAuto(caller);
        }

        /// <summary>
        /// Raises the property changed event.
        /// </summary>
        /// <param name="propName">Name of the property.</param>
        protected override void RaisePropertyChanged(string propName)
        {
            base.RaisePropertyChanged(propName);

            if (propName == nameof(IsFree))
            {
                if (IsFree)
                {
                    Mouse.OverrideCursor = null;
                }
                else
                {
                    Mouse.OverrideCursor = Cursors.AppStarting;
                }
            }
        }

        /// <summary>
        /// Called on <see cref="IAuthenticationProvider.CurrentUserChanged"/>.
        /// </summary>
        /// <param name="sender">The sender.</param>
        /// <param name="user">The user.</param>
        protected virtual void OnCurrentUserChanged(object sender, User user)
        {
            InvalidateRelayCommands();
        }
    }

    /// <summary>
    /// Represents an FSE view model with a auto ModuleSettings property.
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <seealso cref="Tango.FSE.Common.FSEViewModel" />
    public abstract class FSEViewModelWithModuleSettings<T> : FSEViewModel where T : SettingsBase
    {
        /// <summary>
        /// Gets or sets the module settings.
        /// </summary>
        public T ModuleSettings { get; private set; }

        /// <summary>
        /// Initializes a new instance of the <see cref="FSEViewModelWithModuleSettings{T}"/> class.
        /// </summary>
        public FSEViewModelWithModuleSettings()
        {
            ModuleSettings = SettingsManager.Default.GetOrCreate<T>();
        }
    }

    /// <summary>
    /// Represents a FSE view model base class a View property as an instance of a <see cref="IFSEView"/> contract.
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <seealso cref="Tango.SharedUI.ViewModel" />
    public abstract class FSEViewModel<T> : FSEViewModel where T : IFSEView
    {
        private T _view;
        /// <summary>
        /// Gets the IFSEView 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 IFSEView 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 IFSEView is available.
        /// </summary>
        public virtual void OnViewAttached()
        {

        }
    }

    public abstract class FSEViewModelWithModuleSettings<TView,TSettings> : FSEViewModel<TView> where TView : IFSEView where TSettings : SettingsBase
    {
        /// <summary>
        /// Gets or sets the module settings.
        /// </summary>
        public TSettings ModuleSettings { get; private set; }

        /// <summary>
        /// Initializes a new instance of the <see cref="FSEViewModelWithModuleSettings{T}"/> class.
        /// </summary>
        public FSEViewModelWithModuleSettings()
        {
            ModuleSettings = SettingsManager.Default.GetOrCreate<TSettings>();
        }
    }
}