using System;
using System.Threading.Tasks;
using Serilog;
using TINK.Model.Bikes.BikeInfoNS.BluetoothLock;
using TINK.Model.Connector;
using TINK.Model.Device;
using TINK.Model.User;
using TINK.MultilingualResources;
using TINK.Repository.Exception;
using TINK.Services.BluetoothLock;
using TINK.Services.BluetoothLock.Exception;
using TINK.Services.Geolocation;
using TINK.View;

namespace TINK.ViewModel.Bikes.Bike.BluetoothLock.RequestHandler
{
	/// <summary> Bike is disposable, lock is open and connected to app. </summary>
	/// <remarks> 
	/// This state can not be occur because
	/// - app does not allow to return bike/ cancel reservation when lock is not closed
	/// - as long as app is connected to lock
	///     - lock can not be opened manually
	///     - no other device can access lock
	/// </remarks>
	public class DisposableOpen : Base, IRequestHandler
	{
		/// <summary> Bike is disposable, lock is open and can be reached via bluetooth. </summary>
		/// <remarks> 
		/// This state should never occur because as long as a ILOCKIT is connected it
		/// - cannot be closed manually 
		/// - no other device can access lock
		/// - app itself should never event attempt to open a lock which is not rented.
		/// </remarks>
		/// <param name="smartDevice">Provides info about the smart device (phone, tablet, ...)</param>
		/// <param name="bikesViewModel">View model to be used for progress report and unlocking/ locking view.</param>
		public DisposableOpen(
			   IBikeInfoMutable selectedBike,
			   Func<bool> isConnectedDelegate,
			   Func<bool, IConnector> connectorFactory,
			   IGeolocationService geolocation,
			   ILocksService lockService,
			   Func<IPollingUpdateTaskManager> viewUpdateManager,
			   ISmartDevice smartDevice,
			   IViewService viewService,
			   IBikesViewModel bikesViewModel,
			   IUser activeUser) : base(
				   selectedBike,
				   AppResources.ActionBookOrClose,
				   true, // Show copri button to enable reserving
				   isConnectedDelegate,
				   connectorFactory,
				   geolocation,
				   lockService,
				   viewUpdateManager,
				   smartDevice,
				   viewService,
				   bikesViewModel,
				   activeUser)
		{
			LockitButtonText = GetType().Name;
			IsLockitButtonVisible = false;
		}

		/// <summary>Books bike by reserving bike, opening lock and booking bike.</summary>
		/// <returns>Next request handler.</returns>
		public async Task<IRequestHandler> HandleRequestOption1() => await DoBookOrClose();

		public async Task<IRequestHandler> HandleRequestOption2() => await UnsupportedRequest();


		/// <summary>Books bike by reserving bike, opening lock and booking bike.</summary>
		/// <returns>Next request handler.</returns>
		public async Task<IRequestHandler> DoBookOrClose()
		{
			BikesViewModel.IsIdle = false; // Lock list to avoid multiple taps while copri action is pending.

			// Stop polling before requesting bike.
			BikesViewModel.ActionText = AppResources.ActivityTextOneMomentPlease;
			await ViewUpdateManager().StopUpdatePeridically();

			// Ask whether to really book bike or close lock?
			var l_oResult = await ViewService.DisplayAlert(
				string.Empty,
				$"Fahrrad {SelectedBike.GetFullDisplayName()} mieten oder Schloss schließen?",
				"Mieten",
				"Schloss schließen");

			if (l_oResult == false)
			{
				// Close lock
				Log.ForContext<DisposableOpen>().Information("User selected disposable bike {bike} in order to close lock.", SelectedBike);
				BikesViewModel.ActionText = AppResources.ActivityTextClosingLock;
				try
				{
					SelectedBike.LockInfo.State = (await LockService[SelectedBike.LockInfo.Id].CloseAsync())?.GetLockingState() ?? LockingState.UnknownDisconnected;
				}
				catch (Exception exception)
				{
					BikesViewModel.ActionText = string.Empty;
					if (exception is OutOfReachException)
					{
						Log.ForContext<DisposableOpen>().Debug("Lock can not be closed. {Exception}", exception);

						await ViewService.DisplayAlert(
							AppResources.ErrorCloseLockTitle,
							AppResources.ErrorCloseLockOutOfReachMessage,
							AppResources.MessageAnswerOk);
					}
					else if (exception is CouldntCloseMovingException)
					{
						Log.ForContext<DisposableOpen>().Debug("Lock can not be closed. Lock is out of reach. {Exception}", exception);

						await ViewService.DisplayAlert(
							AppResources.ErrorCloseLockTitle,
							AppResources.ErrorCloseLockMovingMessage,
							AppResources.MessageAnswerOk);
					}
					else if (exception is CouldntCloseBoldBlockedException)
					{
						Log.ForContext<DisposableOpen>().Debug("Lock can not be closed. Lock is out of reach. {Exception}", exception);

						await ViewService.DisplayAlert(
							AppResources.ErrorCloseLockTitle,
							AppResources.ErrorCloseLockBoldBlockedMessage,
							AppResources.MessageAnswerOk);
					}
					else
					{
						Log.ForContext<DisposableOpen>().Error("Lock can not be closed. {Exception}", exception);

						await ViewService.DisplayAlert(
							AppResources.ErrorCloseLockTitle,
							exception.Message,
							AppResources.MessageAnswerOk);
					}

					SelectedBike.LockInfo.State = exception is StateAwareException stateAwareException
						? stateAwareException.State
						: LockingState.UnknownDisconnected;

					BikesViewModel.ActionText = AppResources.ActivityTextStartingUpdater;
					await ViewUpdateManager().StartUpdateAyncPeridically();
					BikesViewModel.ActionText = string.Empty;
					BikesViewModel.IsIdle = true;
					return RequestHandlerFactory.Create(SelectedBike, IsConnectedDelegate, ConnectorFactory, GeolocationService, LockService, ViewUpdateManager, SmartDevice, ViewService, BikesViewModel, ActiveUser);
				}

				// Disconnect lock.
				BikesViewModel.ActionText = AppResources.ActivityTextDisconnectingLock;
				try
				{
					SelectedBike.LockInfo.State = await LockService.DisconnectAsync(SelectedBike.LockInfo.Id, SelectedBike.LockInfo.Guid);
				}
				catch (Exception exception)
				{
					Log.ForContext<DisposableOpen>().Error("Lock can not be disconnected. {Exception}", exception);

					BikesViewModel.ActionText = AppResources.ActivityTextErrorDisconnect;
				}

				BikesViewModel.ActionText = AppResources.ActivityTextStartingUpdater;
				await ViewUpdateManager().StartUpdateAyncPeridically();
				BikesViewModel.ActionText = string.Empty;
				BikesViewModel.IsIdle = true;
				return RequestHandlerFactory.Create(SelectedBike, IsConnectedDelegate, ConnectorFactory, GeolocationService, LockService, ViewUpdateManager, SmartDevice, ViewService, BikesViewModel, ActiveUser);
			}

			// Lock list to avoid multiple taps while copri action is pending.
			Log.ForContext<DisposableOpen>().Information("Request to book bike {bike}.", SelectedBike);

			BikesViewModel.ActionText = AppResources.ActivityTextReadingChargingLevel;
			try
			{
				SelectedBike.LockInfo.BatteryPercentage = await LockService[SelectedBike.LockInfo.Id].GetBatteryPercentageAsync();
			}
			catch (Exception exception)
			{
				if (exception is OutOfReachException)
				{
					Log.ForContext<DisposableOpen>().Debug("Battery state can not be read, bike out of range. {Exception}", exception);

					BikesViewModel.ActionText = AppResources.ActivityTextErrorReadingChargingLevelOutOfReach;
				}
				else
				{
					Log.ForContext<DisposableOpen>().Error("Battery state can not be read. {Exception}", exception);

					BikesViewModel.ActionText = AppResources.ActivityTextErrorReadingChargingLevelGeneral;
				}
			}

			// Notify copri about unlock action in order to start booking.
			BikesViewModel.ActionText = AppResources.ActivityTextRentingBike;
			IsConnected = IsConnectedDelegate();
			try
			{
				await ConnectorFactory(IsConnected).Command.DoBookAsync(SelectedBike);
			}
			catch (Exception l_oException)
			{
				BikesViewModel.ActionText = string.Empty;

				if (l_oException is WebConnectFailureException)
				{
					// Copri server is not reachable.
					Log.ForContext<DisposableOpen>().Information("User selected requested bike {l_oId} but reserving failed (Copri server not reachable).", SelectedBike.Id);

					await ViewService.DisplayAlert(
						AppResources.MessageRentingBikeErrorConnectionTitle,
						string.Format(AppResources.MessageErrorLockIsClosedThreeLines, l_oException.Message, WebConnectFailureException.GetHintToPossibleExceptionsReasons),
						AppResources.MessageAnswerOk);
				}
				else
				{
					Log.ForContext<DisposableOpen>().Error("User selected requested bike {l_oId} but reserving failed. {@l_oException}", SelectedBike.Id, l_oException);

					await ViewService.DisplayAlert(
						AppResources.MessageRentingBikeErrorGeneralTitle,
						string.Format(AppResources.MessageErrorLockIsClosedTwoLines, l_oException.Message),
						AppResources.MessageAnswerOk);
				}

				// If booking failed lock bike again because bike is only reserved.
				BikesViewModel.ActionText = "Verschließe Schloss...";
				try
				{
					SelectedBike.LockInfo.State = (await LockService[SelectedBike.LockInfo.Id].CloseAsync())?.GetLockingState() ?? LockingState.UnknownDisconnected;
				}
				catch (Exception exception)
				{
					Log.ForContext<DisposableOpen>().Error("Locking bike after booking failure failed. {Exception}", exception);

					SelectedBike.LockInfo.State = exception is StateAwareException stateAwareException
						? stateAwareException.State
						: LockingState.UnknownDisconnected;
				}

				// Disconnect lock.
				BikesViewModel.ActionText = AppResources.ActivityTextDisconnectingLock;
				try
				{
					SelectedBike.LockInfo.State = await LockService.DisconnectAsync(SelectedBike.LockInfo.Id, SelectedBike.LockInfo.Guid);
				}
				catch (Exception exception)
				{
					Log.ForContext<DisposableOpen>().Error("Lock can not be disconnected. {Exception}", exception);

					BikesViewModel.ActionText = AppResources.ActivityTextErrorDisconnect;
				}

				// Restart polling again.
				BikesViewModel.ActionText = AppResources.ActivityTextStartingUpdater;
				await ViewUpdateManager().StartUpdateAyncPeridically();

				// Update status text and unlock list of bikes because no more action is pending.
				BikesViewModel.ActionText = string.Empty; // Todo: Move this statement in front of finally block because in catch block BikesViewModel.ActionText is already set to empty.
				BikesViewModel.IsIdle = true;
				return RequestHandlerFactory.Create(SelectedBike, IsConnectedDelegate, ConnectorFactory, GeolocationService, LockService, ViewUpdateManager, SmartDevice, ViewService, BikesViewModel, ActiveUser);
			}

			Log.ForContext<DisposableOpen>().Information("User reserved bike {bike} successfully.", SelectedBike);

			// Restart polling again.
			BikesViewModel.ActionText = AppResources.ActivityTextStartingUpdater;
			await ViewUpdateManager().StartUpdateAyncPeridically();

			// Update status text and unlock list of bikes because no more action is pending.
			BikesViewModel.ActionText = string.Empty; // Todo: Move this statement in front of finally block because in catch block BikesViewModel.ActionText is already set to empty.
			BikesViewModel.IsIdle = true;
			return RequestHandlerFactory.Create(SelectedBike, IsConnectedDelegate, ConnectorFactory, GeolocationService, LockService, ViewUpdateManager, SmartDevice, ViewService, BikesViewModel, ActiveUser);
		}

		/// <summary> Request is not supported, button should be disabled. </summary>
		/// <returns></returns>
		public async Task<IRequestHandler> UnsupportedRequest()
		{
			Log.ForContext<DisposableOpen>().Error("Click of unsupported button click detected.");
			return await Task.FromResult<IRequestHandler>(this);
		}
	}
}