using System;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
using Serilog;
using TINK.Model;
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.Repository.Request;
using TINK.Services.BluetoothLock;
using TINK.Services.BluetoothLock.Exception;
using TINK.Services.Geolocation;
using TINK.View;

namespace TINK.ViewModel.Bikes.Bike.BluetoothLock.RequestHandler
{
	public class BookedClosed : 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 BookedClosed(
		   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.ActionReturn, // Copri button text "Miete beenden"
			   true, // Show button to enabled returning of bike.
			   isConnectedDelegate,
			   connectorFactory,
			   geolocation,
			   lockService,
			   viewUpdateManager,
			   smartDevice,
			   viewService,
			   bikesViewModel,
			   activeUser)
		{
			LockitButtonText = AppResources.ActionOpenAndPause;
			IsLockitButtonVisible = true; // Show button to enable opening lock in case user took a pause and does not want to return the bike.
		}

		/// <summary> Return bike. </summary>
		public async Task<IRequestHandler> HandleRequestOption1() => await ReturnBike();

		/// <summary> Open bike and update COPRI lock state. </summary>
		public async Task<IRequestHandler> HandleRequestOption2() => await OpenLock();

		/// <summary> Return bike. </summary>
		public async Task<IRequestHandler> ReturnBike()
		{
			BikesViewModel.IsIdle = false;
			var ctsLocation = new CancellationTokenSource();
			Task<IGeolocation> currentLocationTask = null;

			// Try getting geolocation which was requested when closing lock.
			IGeolocation currentLocation = SelectedBike.LockInfo.Location;
			var lastConfimredLockStateTimeStamp = SelectedBike.LockInfo.LastLockingStateChange;

			// Check if bike is around.
			var deviceState = LockService[SelectedBike.LockInfo.Id].GetDeviceState();

			// Check if
			// - geolocation is already available
			// - or if bike is in reach so that geolocation makes sense
			if (currentLocation == null && deviceState != DeviceState.Connected)
			{
				// Geolocation information is missing and can not be queried.
				Log.ForContext<BookedClosed>().Information("User selected booked bike {bike} but returning failed. COPRI returned an error.", SelectedBike);

				await ViewService.DisplayAlert(
					AppResources.ErrorReturnBikeTitle,
					AppResources.Error_ReturnBike_Station_Location_Message,
					AppResources.MessageAnswerOk);

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

					BikesViewModel.ActionText = AppResources.ActivityTextErrorDisconnect;
				}

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

			// Check if querying geolocation is required.
			if (currentLocation == null)
			{
				BikesViewModel.ActionText = AppResources.ActivityTextQueryLocationStart;    

				// Start getting geolocation.
				try
				{
					currentLocationTask = GeolocationService.GetAsync(ctsLocation.Token, DateTime.Now);
				}
				catch (Exception ex)
				{
					// No location information available.
					Log.ForContext<BookedClosed>().Information("Getting geolocation when returning bike {Bike} failed. {Exception}", SelectedBike, ex);

					await ViewService.DisplayAlert(
						AppResources.ErrorReturnBikeTitle,
						AppResources.ErrorReturnBikeLockClosedStartGetGPSExceptionMessage,
						AppResources.MessageAnswerOk);

					BikesViewModel.ActionText = string.Empty;
					BikesViewModel.IsIdle = true;
					return this;
				}
			}

			// Ask whether to really return bike?
			var l_oResult = await ViewService.DisplayAlert(
				string.Empty,
				string.Format(AppResources.QuestionReturnBike, SelectedBike.GetFullDisplayName()),
				AppResources.MessageAnswerYes,
				AppResources.MessageAnswerNo);

			if (l_oResult == false)
			{
				// User aborted returning bike process
				Log.ForContext<BookedClosed>().Information("User selected booked bike {l_oId} in order to return but action was canceled.", SelectedBike.Id);

				// Cancel getting geolocation.
				ctsLocation.Cancel();
				BikesViewModel.ActionText = AppResources.ActivityTextQueryLocationCancelWait;
				try
				{
					await Task.WhenAny(new List<Task> { currentLocationTask ?? Task.CompletedTask });
				}
				catch (Exception ex)
				{
					// No location information available.
					Log.ForContext<BookedClosed>().Information("Canceling query location failed on abort returning closed bike failed. {Exception}", SelectedBike, ex);
				}

				BikesViewModel.IsIdle = true;
				return this;
			}

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

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

			// Get geolocation if
			// - geolocation was not available when closing lock
			// - bike is around (lock is connected via bluetooth)
			LocationDto currentLocationDto = null;
			if (currentLocation == null)
			{
				BikesViewModel.ActionText = AppResources.ActivityTextQueryLocation;
				try
				{
					await Task.WhenAny(new List<Task> { currentLocationTask ?? Task.CompletedTask });
					currentLocation = currentLocationTask?.Result ?? null;
				}
				catch (Exception ex)
				{
					// No location information available.
					Log.ForContext<BookedClosed>().Information("Returning closed bike {Bike} is not possible. Cancel geolocation query failed. {Exception}", SelectedBike, ex);

					await ViewService.DisplayAlert(
						AppResources.ErrorQueryGeolocation,
						AppResources.ErrorReturnBikeLockClosedGetGPSExceptionMessage,
						AppResources.MessageAnswerOk);

					BikesViewModel.ActionText = AppResources.ActivityTextStartingUpdater;
					await ViewUpdateManager().StartUpdateAyncPeridically();
					BikesViewModel.ActionText = string.Empty;
					BikesViewModel.IsIdle = true;
					return this;
				}

				lastConfimredLockStateTimeStamp = DateTime.Now;
			}

			currentLocationDto = currentLocation != null
				? new LocationDto.Builder
				{
					Latitude = currentLocation.Latitude,
					Longitude = currentLocation.Longitude,
					Accuracy = currentLocation.Accuracy ?? double.NaN,
					Age = lastConfimredLockStateTimeStamp is DateTime lastLockState ? lastLockState.Subtract(currentLocation.Timestamp.DateTime) : TimeSpan.MaxValue,
				}.Build()
				: null;

			BikesViewModel.ActionText = AppResources.ActivityTextReturningBike;
			IsConnected = IsConnectedDelegate();

			var feedBackUri = SelectedBike?.OperatorUri;
			BookingFinishedModel bookingFinished;
			try
			{
				bookingFinished = await ConnectorFactory(IsConnected).Command.DoReturn(
					SelectedBike,
					currentLocationDto);
			}
			catch (Exception exception)
			{
				BikesViewModel.ActionText = string.Empty;

				if (exception is WebConnectFailureException)
				{
					// Copri server is not reachable.
					Log.ForContext<BookedClosed>().Information("User selected booked bike {bike} but returning failed (Copri server not reachable).", SelectedBike);

					await ViewService.DisplayAdvancedAlert(
						AppResources.ErrorReturnBikeNoWebTitle,
						string.Format("{0}\r\n{1}", AppResources.ErrorReturnBikeNoWebMessage, WebConnectFailureException.GetHintToPossibleExceptionsReasons),
						exception.Message,
						AppResources.MessageAnswerOk);
				}
				else if (exception is NotAtStationException notAtStationException)
				{
					// COPRI returned an error.
					Log.ForContext<BookedClosed>().Information(
							"User selected booked bike {bike} but returning failed. COPRI returned out of GEO fencing error. Position send to COPRI {@position}.",
							SelectedBike,
							currentLocationDto);

					await ViewService.DisplayAlert(
						AppResources.ErrorReturnBikeTitle,
						string.Format(AppResources.ErrorReturnBikeNotAtStationMessage, notAtStationException.StationNr, notAtStationException.Distance),
						AppResources.MessageAnswerOk);
				}
				else if (exception is NoGPSDataException)
				{
					// COPRI returned an error.
					Log.ForContext<BookedClosed>().Information("User selected booked bike {bike} but returning failed. COPRI returned an no GPS- data error.", SelectedBike);

					await ViewService.DisplayAlert(
						AppResources.ErrorReturnBikeTitle,
						string.Format(AppResources.ErrorReturnBikeLockClosedNoGPSMessage),
						AppResources.MessageAnswerOk);
				}
				else if (exception is ResponseException copriException)
				{
					// COPRI returned an error.
					Log.ForContext<BookedClosed>().Information("User selected booked bike {bike} but returning failed. COPRI returned an error.", SelectedBike);

					await ViewService.DisplayAdvancedAlert(
						"Statusfehler beim Zurückgeben des Rads!",
						copriException.Message,
						copriException.Response,
						"OK");
				}
				else
				{
					Log.ForContext<BookedClosed>().Error("User selected booked bike {bike} but returning failed. {@l_oException}", SelectedBike.Id, exception);

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

				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);
			}

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

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

				BikesViewModel.ActionText = AppResources.ActivityTextErrorDisconnect;
			}


#if !USERFEEDBACKDLG_OFF
			// Do get Feedback
			var feedback = await ViewService.DisplayUserFeedbackPopup(SelectedBike.Drive?.Battery, bookingFinished?.Co2Saving);
			IsConnected = IsConnectedDelegate();
			try
			{
				await ConnectorFactory(IsConnected).Command.DoSubmitFeedback(
					 new UserFeedbackDto
					 {
						 BikeId = SelectedBike.Id,
						 CurrentChargeBars = feedback.CurrentChargeBars,
						 IsBikeBroken = feedback.IsBikeBroken,
						 Message = feedback.Message
					 },
					feedBackUri);
			}
			catch (Exception exception)
			{
				BikesViewModel.ActionText = string.Empty;

				if (exception is ResponseException copriException)
				{
					// Copri server is not reachable.
					Log.ForContext<BookedClosed>().Information("Submitting feedback for bike {bike} failed. COPRI returned an error.", SelectedBike);
				}
				else
				{
					Log.ForContext<BookedClosed>().Error("Submitting feedback for bike {bike} failed. {@l_oException}", SelectedBike.Id, exception);
				}

				await ViewService.DisplayAlert(
					AppResources.ErrorReturnSubmitFeedbackTitle,
					AppResources.ErrorReturnSubmitFeedbackMessage,
					AppResources.MessageAnswerOk);


				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);
			}
#endif
			if (bookingFinished != null && bookingFinished.MiniSurvey.Questions.Count > 0)
			{
				await ViewService.PushModalAsync(ViewTypes.MiniSurvey);
			}

			// Restart polling again.
			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);
		}

		/// <summary> Open bike and update COPRI lock state. </summary>
		public async Task<IRequestHandler> OpenLock()
		{
			// Unlock bike.
			Log.ForContext<BookedClosed>().Information("User request to unlock bike {bike}.", SelectedBike);

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

			BikesViewModel.ActionText = AppResources.ActivityTextOpeningLock;
			ILockService btLock;
			try
			{
				btLock = LockService[SelectedBike.LockInfo.Id];
				SelectedBike.LockInfo.State = (await btLock.OpenAsync())?.GetLockingState() ?? LockingState.UnknownDisconnected;
			}
			catch (Exception exception)
			{
					BikesViewModel.ActionText = string.Empty;

				if (exception is OutOfReachException)
				{
					Log.ForContext<BookedClosed>().Debug("Lock can not be opened. {Exception}", exception);

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

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

					await ViewService.DisplayAlert(
						AppResources.ErrorOpenLockStillClosedTitle,
						AppResources.ErrorOpenLockBoldStatusIsUnknownMessage,
						"OK");
				}
				else if (exception is CouldntOpenInconsistentStateExecption inconsistentState
						&& inconsistentState.State == LockingState.Closed)
				{
					Log.ForContext<BookedClosed>().Debug("Lock can not be opened. lock reports state closed. {Exception}", exception);

					await ViewService.DisplayAlert(
						AppResources.ErrorOpenLockTitle,
						AppResources.ErrorOpenLockStillClosedMessage,
						"OK");
				}
				else
				{
					Log.ForContext<BookedClosed>().Error("Lock can not be opened. {Exception}", exception);

					await ViewService.DisplayAlert(
						AppResources.ErrorOpenLockTitle,
						exception.Message,
						"OK");
				}

				// When bold is blocked lock is still closed even if exception occurs.
				// In all other cases state is supposed to be unknown. Example: Lock is out of reach and no more bluetooth connected.
				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);
			}

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

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

			try
			{
				await ConnectorFactory(IsConnected).Command.UpdateLockingStateAsync(SelectedBike);
			}
			catch (Exception exception)
			{
				if (exception is WebConnectFailureException)
				{
					// Copri server is not reachable.
					Log.ForContext<BookedClosed>().Information("User locked bike {bike} in order to pause ride but updating failed (Copri server not reachable).", SelectedBike);

					BikesViewModel.ActionText = AppResources.ActivityTextErrorNoWebUpdateingLockstate;
				}
				else if (exception is ResponseException copriException)
				{
					// Copri server is not reachable.
					Log.ForContext<BookedClosed>().Information("User locked bike {bike} in order to pause ride but updating failed. {response}.", SelectedBike, copriException.Response);

					BikesViewModel.ActionText = AppResources.ActivityTextErrorStatusUpdateingLockstate;
				}
				else
				{
					Log.ForContext<BookedClosed>().Error("User locked bike {bike} in order to pause ride but updating failed . {@l_oException}", SelectedBike.Id, exception);
					BikesViewModel.ActionText = AppResources.ActivityTextErrorConnectionUpdateingLockstate;
				}
			}

			Log.ForContext<BookedClosed>().Information("User paused ride using {bike} successfully.", SelectedBike);
			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);
		}
	}
}