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.CopriApi.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.ActionRentBike, // Rent Bike
				   true, // Show button "Rent Bike"
				   isConnectedDelegate,
				   connectorFactory,
				   geolocation,
				   lockService,
				   viewUpdateManager,
				   smartDevice,
				   viewService,
				   bikesViewModel,
				   activeUser)
		{
			LockitButtonText = AppResources.ActionCloseLock; // Close Lock
			IsLockitButtonVisible = true; // Show button "Close Lock"
		}

		/// <summary>Rents bike by reserving bike and renting bike.</summary>
		/// <returns>Next request handler.</returns>
		public async Task<IRequestHandler> HandleRequestOption1() => await RentBike();

		/// <summary>Closes Lock.</summary>
		/// <returns>Next request handler.</returns>
		public async Task<IRequestHandler> HandleRequestOption2() => await CloseLock();

		public async Task<IRequestHandler> RentBike()
		{
			Log.ForContext<DisposableOpen>().Information("User request to book bike {bikeId}.", SelectedBike.Id);
			BikesViewModel.IsIdle = false;

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

			//reserve bike prior to book.
			BikesViewModel.ActionText = AppResources.ActivityTextReservingBike;
			IsConnected = IsConnectedDelegate();
			try
			{
				await ConnectorFactory(IsConnected).Command.DoReserve(SelectedBike);
				Log.ForContext<DisposableOpen>().Information("User reserved bike {bikeId} successfully.", SelectedBike.Id);
			}
			catch (Exception exception)
			{
				BikesViewModel.ActionText = string.Empty;
				Log.ForContext<DisposableOpen>().Information("Request to reserve bike {bikeId} declined.", SelectedBike.Id);
				if (exception is BookingDeclinedException)
				{
					// Too many bikes booked.
					Log.ForContext<DisposableOpen>().Error("Maximum count of bikes {exception.MaxBikesCount} already requested/ booked.", (exception as BookingDeclinedException).MaxBikesCount);

					await ViewService.DisplayAlert(
						AppResources.MessageHintTitle,
						string.Format(AppResources.ErrorReservingBikeTooManyReservationsRentals, SelectedBike.Id, (exception as BookingDeclinedException).MaxBikesCount),
						AppResources.MessageAnswerOk);
				}
				else if (exception is WebConnectFailureException
					|| exception is RequestNotCachableException)
				{
					// Copri server is not reachable.
					Log.ForContext<DisposableOpen>().Error("Copri server not reachable.");

					await ViewService.DisplayAlert(
						AppResources.ErrorNoConnectionTitle,
						AppResources.ErrorNoWeb,
						AppResources.MessageAnswerOk);
				}
				else
				{
					Log.ForContext<DisposableOpen>().Error("{@exception}", exception);

					await ViewService.DisplayAdvancedAlert(
						AppResources.ErrorReservingBikeTitle,
						exception.Message,
						AppResources.ErrorTryAgain,
						AppResources.MessageAnswerOk);
				}

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

				// Restart polling again.
				BikesViewModel.ActionText = AppResources.ActivityTextStartingUpdater;
				await ViewUpdateManager().StartAsync();
				BikesViewModel.ActionText = string.Empty;
				BikesViewModel.IsIdle = true;
				return this;
			}

			// Book bike
			BikesViewModel.ActionText = AppResources.ActivityTextRentingBike;
			IsConnected = IsConnectedDelegate();
			try
			{
				await ConnectorFactory(IsConnected).Command.DoBookAsync(SelectedBike);
				Log.ForContext<DisposableOpen>().Information("User booked bike {bikeId} successfully.", SelectedBike.Id);
			}
			catch (Exception exception)
			{
				BikesViewModel.ActionText = string.Empty;
				Log.ForContext<DisposableOpen>().Information("Booking of bike {bikeId} failed.", SelectedBike.Id);
				if (exception is WebConnectFailureException)
				{
					// Copri server is not reachable.
					Log.ForContext<DisposableOpen>().Error("Copri server not reachable.");

					await ViewService.DisplayAlert(
						AppResources.ErrorNoConnectionTitle,
						AppResources.ErrorNoWeb,
						AppResources.MessageAnswerOk);
				}
				else
				{
					Log.ForContext<DisposableOpen>().Error("{@exception}", exception);

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

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

				BikesViewModel.ActionText = AppResources.ActivityTextStartingUpdater;
				await ViewUpdateManager().StartAsync(); // Restart polling again.
				BikesViewModel.ActionText = string.Empty;
				BikesViewModel.IsIdle = true; // Unlock GUI
				return RequestHandlerFactory.Create(SelectedBike, IsConnectedDelegate, ConnectorFactory, GeolocationService, LockService, ViewUpdateManager, SmartDevice, ViewService, BikesViewModel, ActiveUser);
			}

			// Get current charging level
			BikesViewModel.ActionText = AppResources.ActivityTextReadingChargingLevel;
			ILockService btLock = LockService[SelectedBike.LockInfo.Id];
			try
			{
				SelectedBike.LockInfo.BatteryPercentage = await btLock.GetBatteryPercentageAsync();
				Log.ForContext<DisposableOpen>().Information("Battery state of lock from {bikeId} read successfully.", SelectedBike.Id);
			}
			catch (Exception exception)
			{
				Log.ForContext<DisposableOpen>().Information("Battery state of lock from {bikeId} can not be read.", SelectedBike.Id);
				if (exception is OutOfReachException)
				{
					Log.ForContext<DisposableOpen>().Debug("Lock is out of reach.");
					BikesViewModel.ActionText = AppResources.ActivityTextErrorReadingChargingLevelOutOfReach;
				}
				else
				{
					Log.ForContext<DisposableOpen>().Error("{@exception}", exception);
					BikesViewModel.ActionText = AppResources.ActivityTextErrorReadingChargingLevelGeneral;
				}
			}

			// Get lock infos.
			BikesViewModel.ActionText = AppResources.ActivityTextStartingUpdatingLockingState;
			var versionTdo = btLock.VersionInfo;
			if (versionTdo != null)
			{
				SelectedBike.LockInfo.VersionInfo = new VersionInfo.Builder
				{
					FirmwareVersion = versionTdo.FirmwareVersion,
					HardwareVersion = versionTdo.HardwareVersion,
					LockVersion = versionTdo.LockVersion,
				}.Build();
			}

			// Update backend
			IsConnected = IsConnectedDelegate();
			try
			{
				await ConnectorFactory(IsConnected).Command.UpdateLockingStateAsync(SelectedBike);
				Log.ForContext<DisposableOpen>().Information("Backend updated for bike {bikeId} successfully.", SelectedBike.Id);
			}
			catch (Exception exception)
			{
				Log.ForContext<DisposableOpen>().Information("Updating backend for bike {bikeId} failed.", SelectedBike.Id);
				if (exception is WebConnectFailureException)
				{
					// No web.
					Log.ForContext<DisposableOpen>().Debug("Copri server not reachable. No web");
					BikesViewModel.ActionText = AppResources.ActivityTextErrorNoWebUpdateingLockstate;
				}
				else if (exception is ResponseException copriException)
				{
					// Copri exception.
					Log.ForContext<DisposableOpen>().Debug("{response}", copriException.Response);
					BikesViewModel.ActionText = AppResources.ActivityTextErrorStatusUpdateingLockstate;
				}
				else
				{
					Log.ForContext<DisposableOpen>().Debug("{@exception}", exception);
					BikesViewModel.ActionText = AppResources.ActivityTextErrorConnectionUpdateingLockstate;
				}
			}

			BikesViewModel.ActionText = AppResources.ActivityTextStartingUpdater;
			await ViewUpdateManager().StartAsync(); // Restart polling again.
			BikesViewModel.ActionText = string.Empty;
			BikesViewModel.IsIdle = true; // Unlock GUI
			return RequestHandlerFactory.Create(SelectedBike, IsConnectedDelegate, ConnectorFactory, GeolocationService, LockService, ViewUpdateManager, SmartDevice, ViewService, BikesViewModel, ActiveUser);
		}

		public async Task<IRequestHandler> CloseLock()
		{
			Log.ForContext<DisposableOpen>().Information("User request to close lock of bike {bikeId}.", SelectedBike.Id);
			BikesViewModel.IsIdle = false;

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

			// Close lock
			BikesViewModel.ActionText = AppResources.ActivityTextClosingLock;
			try
			{
				SelectedBike.LockInfo.State = (await LockService[SelectedBike.LockInfo.Id].CloseAsync())?.GetLockingState() ?? LockingState.UnknownDisconnected;
				Log.ForContext<DisposableOpen>().Information("Lock of bike {bikeId} closed successfully.", SelectedBike.Id);
			}
			catch (Exception exception)
			{
				Log.ForContext<DisposableOpen>().Information("Lock of bike {bikeId} can not be closed.", SelectedBike.Id);
				BikesViewModel.ActionText = string.Empty;
				if (exception is OutOfReachException)
				{
					Log.ForContext<DisposableOpen>().Debug("Lock is out of reach.");

					await ViewService.DisplayAlert(
						AppResources.ErrorCloseLockTitle,
						AppResources.ErrorLockOutOfReach,
						AppResources.MessageAnswerOk);
				}
				else if (exception is CouldntCloseMovingException)
				{
					Log.ForContext<DisposableOpen>().Debug("Lock is moving.");

					await ViewService.DisplayAlert(
						AppResources.ErrorCloseLockTitle,
						AppResources.ErrorLockMoving,
						AppResources.MessageAnswerOk);
				}
				else if (exception is CouldntCloseBoltBlockedException)
				{
					Log.ForContext<DisposableOpen>().Debug("Bold is blocked.");

					await ViewService.DisplayAlert(
						AppResources.ErrorCloseLockTitle,
						AppResources.ErrorCloseLockBoltBlocked,
						AppResources.MessageAnswerOk);
				}
				else
				{
					Log.ForContext<DisposableOpen>().Debug("{@exception}", exception);

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

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

			// get current charging level
			ILockService btLock = LockService[SelectedBike.LockInfo.Id];
			BikesViewModel.ActionText = AppResources.ActivityTextReadingChargingLevel;
			try
			{
				SelectedBike.LockInfo.BatteryPercentage = await btLock.GetBatteryPercentageAsync();
				Log.ForContext<ReservedOpen>().Information("Battery state of lock from {bikeId} read successfully.", SelectedBike.Id);
			}
			catch (Exception exception)
			{
				Log.ForContext<ReservedOpen>().Information("Battery state of lock from {bikeId} can not be read", SelectedBike.Id);
				if (exception is OutOfReachException)
				{
					Log.ForContext<ReservedOpen>().Debug("Lock is out of reach.");
					BikesViewModel.ActionText = AppResources.ActivityTextErrorReadingChargingLevelOutOfReach;
				}
				else
				{
					Log.ForContext<ReservedOpen>().Debug("{@exception}", exception);
					BikesViewModel.ActionText = AppResources.ActivityTextErrorReadingChargingLevelGeneral;
				}
			}

			// Get lock infos.
			BikesViewModel.ActionText = AppResources.ActivityTextStartingUpdatingLockingState;
			var versionTdo = btLock.VersionInfo;
			if (versionTdo != null)
			{
				SelectedBike.LockInfo.VersionInfo = new VersionInfo.Builder
				{
					FirmwareVersion = versionTdo.FirmwareVersion,
					HardwareVersion = versionTdo.HardwareVersion,
					LockVersion = versionTdo.LockVersion,
				}.Build();
			}

			// update backend
			IsConnected = IsConnectedDelegate();
			try
			{
				await ConnectorFactory(IsConnected).Command.UpdateLockingStateAsync(SelectedBike);
				Log.ForContext<ReservedOpen>().Information("Backend updated for bike {bikeId} successfully.", SelectedBike.Id);
			}
			catch (Exception exception)
			{
				Log.ForContext<ReservedOpen>().Information("Updating backend for bike {bikeId} failed.", SelectedBike.Id);
				if (exception is WebConnectFailureException)
				{
					// No web.
					Log.ForContext<ReservedOpen>().Debug("Copri server not reachable. No web.");
					BikesViewModel.ActionText = AppResources.ActivityTextErrorNoWebUpdateingLockstate;
				}
				else if (exception is ResponseException copriException)
				{
					// Copri exception.
					Log.ForContext<ReservedOpen>().Debug("{response}", copriException.Response);
					BikesViewModel.ActionText = AppResources.ActivityTextErrorStatusUpdateingLockstate;
				}
				else
				{
					Log.ForContext<ReservedOpen>().Debug("{@exception}", exception);
					BikesViewModel.ActionText = AppResources.ActivityTextErrorConnectionUpdateingLockstate;
				}
			}

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

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