using System;
using System.ComponentModel;
using System.ComponentModel.Composition;
using System.Threading.Tasks;
using DTS.Common.Events;
using DTS.Common.Events.Database;
using Prism.Events;
using Prism.Regions;
using Unity;
using DTS.Common.Interactivity;
using Prism.Commands;
using DTS.Common.Interface.Database;
using DTS.Common.Storage;
using DTS.Common.Utilities.Logging;

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

namespace DatabaseServices
{
    /// <summary>
    /// this class handles DatabaseCopy functionality
    /// </summary>
    [PartCreationPolicy(CreationPolicy.Shared)]
    public class DatabaseSwitchViewModel : IDatabaseSwitchViewModel
    {
        /// <summary>
        /// The DatabaseCopy view
        /// </summary>
        public IDatabaseSwitchView View { get; set; }

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

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

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

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

        #region constructors and initializers

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

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

            _eventAggregator = eventAggregator;
            UnityContainer = unityContainer;
            _eventAggregator.GetEvent<RaiseNotification>().Subscribe(OnRaiseNotification);
            _eventAggregator.GetEvent<BusyIndicatorChangeNotification>()
                .Subscribe(OnBusyIndicatorNotification, ThreadOption.PublisherThread, true);
        }

        #endregion

        #region Methods

        public void Unset()
        {
        }

        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
            });
        }

        public void SwitchRemote()
        {
            _eventAggregator.GetEvent<AppStatusEvent>().Publish(AppStatusArg.Busy);
            try
            {
                DTS.Common.Storage.DatabaseServices.SetupForRemoteDb(DbHost, NTLMAuthentication, DbUser, DbPassword, DefaultDbName);
                if (!DTS.Common.Storage.DatabaseServices.SimpleDbTest())
                {
                    _eventAggregator.GetEvent<DbStatusEvent>().Publish(
                        new DbStatusArg(DbStatusArg.EventTypes.FailedToConnectToRemote, null));
                    SwitchLocal();
                    return;
                }
            }
            catch (Exception ex)
            {
                _eventAggregator.GetEvent<DbStatusEvent>()
                    .Publish(new DbStatusArg(DbStatusArg.EventTypes.FailedToConnectToRemote, ex));
                APILogger.Log(ex);
                SwitchLocal();
                return;
            }
            OnPropertyChanged("RemoteIsActive");
            _eventAggregator.GetEvent<DbStatusEvent>().Publish(new DbStatusArg(DbStatusArg.EventTypes.LegacyStatus, null));
            _eventAggregator.GetEvent<AppStatusEvent>().Publish(AppStatusArg.Available);
            //http://manuscript.dts.local/f/cases/39203/Local-mode-interacts-with-central-db
            //we are switching to a different database connection, make sure we make the user log in again
            //we aren't guaranteed the user details are sync'd between local and remote
            _eventAggregator.GetEvent<LogoutUserEvent>().Publish(new LogoutUserArg(LogoutUserArg.Reasons.DatabaseSwitch));
        }

        public void SwitchLocal()
        {
            try
            {
                DTS.Common.Utils.Database.CheckLocalDatabaseFilesExist(DefaultDbName, DTS.Common.Storage.DatabaseServices.LOCAL_DB_FOLDER);
            }
            catch (System.IO.FileNotFoundException ex)
            {
                _eventAggregator.GetEvent<PageErrorEvent>().Publish(new PageErrorArg(new[] { Resources.StringResources.SwitchFileNotFound, ex.Message }, null));
                return;
            }
            _eventAggregator.GetEvent<AppStatusEvent>().Publish(AppStatusArg.Busy);
            DTS.Common.Storage.DatabaseServices.SetupLocal(DefaultDbName);
            OnPropertyChanged("RemoteIsActive");
            _eventAggregator.GetEvent<DbStatusEvent>().Publish(new DbStatusArg(DbStatusArg.EventTypes.LegacyStatus, null));
            _eventAggregator.GetEvent<AppStatusEvent>().Publish(AppStatusArg.Available);
            _eventAggregator.GetEvent<LogoutUserEvent>()
                .Publish(new LogoutUserArg(LogoutUserArg.Reasons.DatabaseSwitch));
        }

        public void InitializeDbSettings(string defaultDbName, string dbHost, bool ntlmAuthentication, string dbUser,
            string dbPassword)
        {
            DefaultDbName = defaultDbName;
            DbHost = dbHost;
            NTLMAuthentication = ntlmAuthentication;
            DbUser = dbUser;
            DbPassword = dbPassword;
        }
        #endregion

        #region Properties   

        public string DefaultDbName
        {
            get;
            private set;
        }

        public bool RemoteIsActive => DbOperations._usingCentralizedDB;

        public bool IsDirty { get; private set; }
        private bool _isBusy = false;
        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 string DbHost { get; private set; }
        public bool NTLMAuthentication { get; private set; }
        public string DbUser { get; private set; }
        public string DbPassword { get; private set; }
        #endregion Properties

        #region Commands

        #endregion
    }
}