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.BluetoothLock.Tdo;
using TINK.Services.CopriApi.Exception;
using TINK.Services.Geolocation;
using TINK.View;

namespace TINK.ViewModel.Bikes.Bike.BluetoothLock.RequestHandler
{
	public class ReservedDisconnected : Base, IRequestHandler
	{
		/// <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 ReservedDisconnected(
		   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.ActionCancelReservation,
			   true, // Show button "Cancel Reservation".
			   isConnectedDelegate,
			   connectorFactory,
			   geolocation,
			   lockService,
			   viewUpdateManager,
			   smartDevice,
			   viewService,
			   bikesViewModel,
			   activeUser)
		{
			LockitButtonText = AppResources.ActionSearchLock;
			IsLockitButtonVisible = true; // Show button "Search Lock"
		}

		/// <summary> Cancel reservation. </summary>
		public async Task<IRequestHandler> HandleRequestOption1() => await CancelReservation();

		/// <summary> Connect to reserved bike ask whether to rent bike or not and if yes open lock. </summary>
		/// <returns></returns>
		public async Task<IRequestHandler> HandleRequestOption2() => await ConnectLockAndRentBike();

		/// <summary> Cancel reservation. </summary>
		public async Task<IRequestHandler> CancelReservation()
		{
			Log.ForContext<ReservedDisconnected>().Information("User request to cancel reservation of bike {bikeId}", SelectedBike.Id);
			BikesViewModel.IsIdle = false; // Lock list to avoid multiple taps while copri action is pending.

			var alertResult = await ViewService.DisplayAlert(
				string.Empty,
				string.Format(AppResources.QuestionCancelReservation, SelectedBike.GetFullDisplayName()),
				AppResources.MessageAnswerYes,
				AppResources.MessageAnswerNo);

			if (alertResult == false)
			{
				// User aborted cancel process
				Log.ForContext<ReservedDisconnected>().Information("User canceled request to cancel reservation of bike {bikeId}.", SelectedBike.Id);
				BikesViewModel.IsIdle = true;
				return this;
			}

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

			BikesViewModel.ActionText = AppResources.ActivityTextCancelingReservation;
			IsConnected = IsConnectedDelegate();
			try
			{
				await ConnectorFactory(IsConnected).Command.DoCancelReservation(SelectedBike);
				Log.ForContext<ReservedDisconnected>().Information("User canceled reservation of bike {bikeId} successfully.", SelectedBike.Id);
			}
			catch (Exception exception)
			{
				Log.ForContext<ReservedDisconnected>().Information("User selected reserved bike {bikeId} but cancel reservation failed.", SelectedBike.Id);
				BikesViewModel.ActionText = string.Empty;
				if (exception is InvalidAuthorizationResponseException)
				{
					// Copri response is invalid.
					Log.ForContext<ReservedDisconnected>().Error("Invalid auth. response.");
					await ViewService.DisplayAlert(
						AppResources.ErrorCancelReservationTitle,
						AppResources.ErrorAccountInvalidAuthorization,
						AppResources.MessageAnswerOk);
				}
				else if (exception is WebConnectFailureException
					|| exception is RequestNotCachableException)
				{
					// Copri server is not reachable.
					Log.ForContext<ReservedDisconnected>().Error("Copri server not reachable.");
					await ViewService.DisplayAlert(
						AppResources.ErrorCancelReservationTitle,
						AppResources.ErrorNoWeb,
						AppResources.MessageAnswerOk);
				}
				else
				{
					Log.ForContext<ReservedDisconnected>().Error("{@exception}", exception);
					await ViewService.DisplayAdvancedAlert(
						AppResources.ErrorCancelReservationTitle,
						exception.Message,
						AppResources.ErrorTryAgain,
						AppResources.MessageAnswerOk);
				}

				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);
			}

			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);
		}

		/// <summary> Connect to reserved bike ask whether to rent bike or not and if yes open lock. </summary>
		/// <returns></returns>
		public async Task<IRequestHandler> ConnectLockAndRentBike()
		{
			BikesViewModel.IsIdle = false;
			Log.ForContext<ReservedDisconnected>().Information("User request to connect to lock of bike {bikeId}.", SelectedBike.Id);

			// Stop polling before getting new auth-values.
			BikesViewModel.ActionText = AppResources.ActivityTextOneMomentPlease;
			await ViewUpdateManager().StopAsync();

			BikesViewModel.ActionText = AppResources.ActivityTextQuerryServer;
			IsConnected = IsConnectedDelegate();
			try
			{
				// Repeat reservation to get a new seed/ k_user value.
				await ConnectorFactory(IsConnected).Command.CalculateAuthKeys(SelectedBike);
				Log.ForContext<ReservedDisconnected>().Information("Calculation of AuthKeys successfully.");
			}
			catch (Exception exception)
			{
				BikesViewModel.ActionText = string.Empty;

				if (exception is WebConnectFailureException
					|| exception is RequestNotCachableException)
				{
					// Copri server is not reachable.
					Log.ForContext<ReservedDisconnected>().Information("Calculation of AuthKeys failed (Copri server not reachable).");

					await ViewService.DisplayAlert(
						AppResources.ErrorNoConnectionTitle,
						AppResources.ErrorNoWeb,
						AppResources.MessageAnswerOk);
				}
				else
				{
					Log.ForContext<ReservedDisconnected>().Error("Calculation of AuthKeys failed. {@exception}", exception);

					await ViewService.DisplayAdvancedAlert(
						AppResources.ErrorConnectLockTitle,
						exception.Message,
						AppResources.ErrorConnectLock,
						AppResources.MessageAnswerOk);
				}

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

			// Connect to lock.
			LockInfoTdo result = null;
			var continueConnect = true;
			var retryCount = 1;
			while (continueConnect && result == null)
			{
				BikesViewModel.ActionText = AppResources.ActivityTextSearchingLock;
				try
				{
					result = await LockService.ConnectAsync(
						new LockInfoAuthTdo.Builder
						{
							Id = SelectedBike.LockInfo.Id,
							Guid = SelectedBike.LockInfo.Guid,
							K_seed = SelectedBike.LockInfo.Seed,
							K_u = SelectedBike.LockInfo.UserKey
						}.Build(),
						LockService.TimeOut.GetSingleConnect(retryCount));
					Log.ForContext<ReservedDisconnected>().Information("Connected to lock of bike {bikeId} successfully. Value is {lockState}.", SelectedBike.Id, SelectedBike.LockInfo.State);

				}
				catch (Exception exception)
				{
					BikesViewModel.ActionText = string.Empty;

					if (exception is ConnectBluetoothNotOnException)
					{
						continueConnect = false;

						await ViewService.DisplayAlert(
							AppResources.ErrorConnectLockTitle,
							AppResources.ErrorLockBluetoothNotOn,
							AppResources.MessageAnswerOk);
						Log.ForContext<ReservedDisconnected>().Debug("Connection to lock of bike {bikeId} failed, bluetooth is off.", SelectedBike.Id);
					}
					else if (exception is ConnectLocationPermissionMissingException)
					{
						continueConnect = false;

						await ViewService.DisplayAlert(
							AppResources.ErrorConnectLockTitle,
							AppResources.ErrorNoLocationPermission,
							AppResources.MessageAnswerOk);
						Log.ForContext<ReservedDisconnected>().Debug("Connection to lock of bike {bikeId} failed, location permissions are missing.", SelectedBike.Id);
					}
					else if (exception is ConnectLocationOffException)
					{
						continueConnect = false;

						await ViewService.DisplayAlert(
							AppResources.ErrorConnectLockTitle,
							AppResources.ErrorLockLocationOff,
							AppResources.MessageAnswerOk);
						Log.ForContext<ReservedDisconnected>().Debug("Connection to lock of bike {bikeId} failed, location services are off.", SelectedBike.Id);
					}
					else if (exception is OutOfReachException)
					{
						continueConnect = false;

						await ViewService.DisplayAlert(
							AppResources.ErrorConnectLockTitle,
							AppResources.ErrorLockOutOfReach,
							AppResources.MessageAnswerOk);
						Log.ForContext<ReservedDisconnected>().Debug("Connection to lock of bike {bikeId} failed, lock is out of reach.", SelectedBike.Id);
					}
					else
					{
						Log.ForContext<ReservedDisconnected>().Error("Lock of bike {bikeId} can not be found. {Exception}", SelectedBike.Id, exception);

						string message;
						if (retryCount < 2)
						{
							message = AppResources.ErrorConnectLock;
						}
						else
						{
							message = AppResources.ErrorConnectLockEscalationLevel1;
						}

						Log.ForContext<ReservedDisconnected>().Error("Lock state can not be retrieved. {Exception}", exception);
						continueConnect = await ViewService.DisplayAdvancedAlert(
								AppResources.ErrorConnectLockTitle,
								message,
								"", // Might show detailed info in future versions.  Property used earlier: IsReportLevelVerbose. Maybe use ActiveUser.DebugLevel.HasFlag(Permissions.ReportLevel) instead.
								AppResources.MessageAnswerRetry,
								AppResources.MessageAnswerCancel);
					}

					if (continueConnect)
					{
						retryCount++;
						continue;
					}

					// Restart polling again.
					BikesViewModel.ActionText = AppResources.ActivityTextStartingUpdater;
					await ViewUpdateManager().StartAsync();
					BikesViewModel.ActionText = string.Empty;
					BikesViewModel.IsIdle = true;
					return this;
				}
			}
			if (!(result?.State is LockitLockingState lockingState))
			{
				Log.ForContext<ReservedDisconnected>().Information("Lock for bike {bikeId} not found.", SelectedBike.Id);
				BikesViewModel.ActionText = string.Empty;

				await ViewService.DisplayAlert(
					AppResources.ErrorConnectLockTitle,
					AppResources.ErrorLockNoStatus,
					AppResources.MessageAnswerOk);

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

			// get current locking state
			var state = lockingState.GetLockingState();
			SelectedBike.LockInfo.State = state;
			SelectedBike.LockInfo.Guid = result?.Guid ?? new Guid();

			// Ask whether to really book bike?
			var alertResult
				= SelectedBike.LockInfo.State != LockingState.Open
				? await ViewService.DisplayAlert(
					string.Empty,
					string.Format(AppResources.QuestionOpenLockAndBookBike, SelectedBike.GetFullDisplayName()),
					AppResources.MessageAnswerYes,
					AppResources.MessageAnswerNo)
				: await ViewService.DisplayAlert(
					string.Empty,
					string.Format(AppResources.QuestionBookBike, SelectedBike.GetFullDisplayName()),
					AppResources.MessageAnswerYes,
					AppResources.MessageAnswerNo);

			if (alertResult == false)
			{
				// User aborted booking process
				Log.ForContext<ReservedDisconnected>().Information("User denied to book reserved bike {bikeId}.", SelectedBike.Id);

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

					BikesViewModel.ActionText = AppResources.ActivityTextErrorDisconnect;
				}

				// Restart polling again.
				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);
			}

			// Book bike prior to opening lock.
			Log.ForContext<ReservedDisconnected>().Information("User request to book reserved bike {bikeId}.", SelectedBike.Id);
			BikesViewModel.ActionText = AppResources.ActivityTextRentingBike;
			IsConnected = IsConnectedDelegate();
			try
			{
				if (SelectedBike.LockInfo.State != LockingState.Open)
				{
					await ConnectorFactory(IsConnected).Command.DoBookAsync(SelectedBike, LockingAction.Open);
				}
				else
				{
					await ConnectorFactory(IsConnected).Command.DoBookAsync(SelectedBike);
				}
				Log.ForContext<ReservedDisconnected>().Information("User booked bike {bikeId} successfully.", SelectedBike.Id);
			}
			catch (Exception exception)
			{
				BikesViewModel.ActionText = string.Empty;

				if (exception is WebConnectFailureException)
				{
					// Copri server is not reachable.
					Log.ForContext<ReservedDisconnected>().Information("Booking of bike {bikeId} failed (Copri server not reachable).", SelectedBike.Id);

					await ViewService.DisplayAlert(
						AppResources.ErrorRentingBikeTitle,
						AppResources.ErrorNoWeb,
						AppResources.MessageAnswerOk);
				}
				else
				{
					Log.ForContext<ReservedDisconnected>().Error("Booking of bike {bikeId} failed. {@exception}", SelectedBike.Id, exception);

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

				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);
			}

			// Unlock bike.
			ILockService btLock = LockService[SelectedBike.LockInfo.Id];
			if (SelectedBike.LockInfo.State != LockingState.Open)
			{
				BikesViewModel.ActionText = AppResources.ActivityTextOpeningLock;
				try
				{
					SelectedBike.LockInfo.State = (await btLock.OpenAsync())?.GetLockingState() ?? LockingState.UnknownDisconnected;
					Log.ForContext<ReservedDisconnected>().Debug("Lock from {bikeId} opened successfully.", SelectedBike.Id);

				}
				catch (Exception exception)
				{
					BikesViewModel.ActionText = string.Empty;
					if (exception is OutOfReachException)
					{
						Log.ForContext<ReservedDisconnected>().Debug("Lock from {bikeId} can not be opened. {Exception}", SelectedBike.Id, exception);

						await ViewService.DisplayAlert(
							AppResources.ErrorOpenLockTitle,
							AppResources.ErrorLockOutOfReach,
							AppResources.MessageAnswerOk);
					}
					else if (exception is CouldntOpenBoldIsBlockedException)
					{
						Log.ForContext<ReservedDisconnected>().Debug("Lock from {bikeId} can not be opened. Bold is blocked. {Exception}", SelectedBike.Id, exception);

						await ViewService.DisplayAlert(
							AppResources.ErrorOpenLockTitle,
							AppResources.ErrorOpenLockBoldBlocked,
							AppResources.MessageAnswerOk);
					}
					else if (exception is CouldntOpenBoldStatusIsUnknownException)
					{
						Log.ForContext<ReservedDisconnected>().Debug("Lock from {bikeId} can not be opened. Bold status is unknown. {Exception}", SelectedBike.Id, exception);

						await ViewService.DisplayAlert(
							AppResources.ErrorOpenLockTitle,
							AppResources.ErrorOpenLockStatusUnknown,
							AppResources.MessageAnswerOk);
					}
					else if (exception is CouldntOpenInconsistentStateExecption inconsistentState
							&& inconsistentState.State == LockingState.Closed)
					{
						Log.ForContext<ReservedDisconnected>().Debug("Lock from {bikeId} can not be opened. lock reports state closed. {Exception}", SelectedBike.Id, exception);

						await ViewService.DisplayAlert(
							AppResources.ErrorOpenLockTitle,
							AppResources.ErrorOpenLockStillClosed,
							AppResources.MessageAnswerOk);
					}
					else
					{
						Log.ForContext<ReservedDisconnected>().Error("Lock from {bikeId} can not be opened. {Exception}", SelectedBike.Id, exception);
						await ViewService.DisplayAdvancedAlert(
							AppResources.ErrorOpenLockTitle,
							exception.Message,
							AppResources.ErrorTryAgain,
							AppResources.MessageAnswerOk);
					}

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

				}
			}

			// get current charging level
			BikesViewModel.ActionText = AppResources.ActivityTextReadingChargingLevel;
			try
			{
				SelectedBike.LockInfo.BatteryPercentage = await btLock.GetBatteryPercentageAsync();
				Log.ForContext<ReservedDisconnected>().Information("Battery state of lock from {bikeId} read successfully.", SelectedBike.Id);
			}
			catch (Exception exception)
			{
				if (exception is OutOfReachException)
				{
					Log.ForContext<ReservedDisconnected>().Debug("Battery state of lock from {bikeId} can not be read, bike out of range. {Exception}", SelectedBike.Id, exception);

					BikesViewModel.ActionText = AppResources.ActivityTextErrorReadingChargingLevelOutOfReach;
				}
				else
				{
					Log.ForContext<ReservedDisconnected>().Error("Battery state of lock from {bikeId} can not be read. {Exception}", SelectedBike.Id, exception);

					BikesViewModel.ActionText = AppResources.ActivityTextErrorReadingChargingLevelGeneral;
				}
			}

			// Lock list to avoid multiple taps while copri action is pending.
			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<ReservedDisconnected>().Information("Backend updated for bike {bikeId} successfully.", SelectedBike.Id);
			}
			catch (Exception exception)
			{
				Log.ForContext<ReservedDisconnected>().Information("Updating backend for bike {bikeId} failed.", SelectedBike.Id);
				if (exception is WebConnectFailureException)
				{
					// No web.
					Log.ForContext<ReservedDisconnected>().Debug("Copri server not reachable. No web.");
					BikesViewModel.ActionText = AppResources.ActivityTextErrorNoWebUpdateingLockstate;
				}
				else if (exception is ResponseException copriException)
				{
					// Copri exception.
					Log.ForContext<ReservedDisconnected>().Debug("{response}.", copriException.Response);
					BikesViewModel.ActionText = AppResources.ActivityTextErrorStatusUpdateingLockstate;
				}
				else
				{
					Log.ForContext<ReservedDisconnected>().Debug("{@exception}", exception);
					BikesViewModel.ActionText = AppResources.ActivityTextErrorConnectionUpdateingLockstate;
				}
			}

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