using System;
using System.Threading.Tasks;
using Serilog;
using ShareeBike.Model.Bikes.BikeInfoNS.BluetoothLock.Command;
using ShareeBike.MultilingualResources;
using ShareeBike.Services.Logging;
using ShareeBike.View;
using CloseCommand = ShareeBike.Model.Bikes.BikeInfoNS.BluetoothLock.Command.CloseCommand;
using CancelReservationCommand = ShareeBike.Model.Bikes.BikeInfoNS.BikeNS.Command.CancelReservationCommand;
using DisconnectCommand = ShareeBike.Model.Bikes.BikeInfoNS.BluetoothLock.Command.DisconnectCommand;
using System.ComponentModel;

namespace ShareeBike.ViewModel.Bikes.Bike.BluetoothLock
{
	/// <summary>
	/// View model for action close bluetooth lock.
	/// </summary>
	/// <typeparam name="T"></typeparam>
	internal class CloseLockActionViewModel<T> : CloseCommand.ICloseCommandListener, CancelReservationCommand.ICancelReservationCommandListener, DisconnectCommand.IDisconnectCommandListener, INotifyPropertyChanged
	{
		/// <summary> Notifies view about changes. </summary>
		public event PropertyChangedEventHandler PropertyChanged;

		/// <summary>
		/// View model to be used for progress report and unlocking/ locking view.
		/// </summary>
		private IBikesViewModel BikesViewModel { get; set; }

		/// <summary>
		/// View service to show modal notifications.
		/// </summary>
		private IViewService ViewService { get; }

		/// <summary>Object to start or stop update of view model objects from Copri.</summary>
		private Func<IPollingUpdateTaskManager> ViewUpdateManager { get; }

		/// <summary> Bike close. </summary>
		private Model.Bikes.BikeInfoNS.BluetoothLock.IBikeInfoMutable SelectedBike { get; }

		/// <summary>
		/// Constructs the object.
		/// </summary>
		/// <param name="selectedBike">Bike to close.</param>
		/// <param name="viewUpdateManager">Object to start or stop update of view model objects from Copri.</param>
		/// <param name="viewService">View service to show modal notifications.</param>
		/// <param name="bikesViewModel">View model to be used for progress report and unlocking/ locking view.</param>
		/// <exception cref="ArgumentException"></exception>
		public CloseLockActionViewModel(
			Model.Bikes.BikeInfoNS.BluetoothLock.IBikeInfoMutable selectedBike,
			Func<IPollingUpdateTaskManager> viewUpdateManager,
			IViewService viewService,
			IBikesViewModel bikesViewModel)
		{
			SelectedBike = selectedBike;
			ViewUpdateManager = viewUpdateManager;
			ViewService = viewService;
			BikesViewModel = bikesViewModel
				?? throw new ArgumentException($"Can not construct {GetType().Name}-object. {nameof(bikesViewModel)} must not be null.");
		}

		/// <summary>
		/// Processes the close lock progress.
		/// </summary>
		/// <param name="step">Current step to process.</param>
		public void ReportStep(CloseCommand.Step step)
		{
			switch (step)
			{
				case CloseCommand.Step.StartStopingPolling:
					break;

				case CloseCommand.Step.StartingQueryingLocation:
					// 1a.Step: Start query geolocation data.
					BikesViewModel.ActionText = AppResources.ActivityTextQueryLocationStart;
					break;

				case CloseCommand.Step.ClosingLock:
					BikesViewModel.ActionText = AppResources.ActivityTextClosingLock;
					break;

				case CloseCommand.Step.WaitStopPollingQueryLocation:
					BikesViewModel.ActionText = AppResources.ActivityTextQueryLocation;
					break;

				case CloseCommand.Step.QueryLocationTerminated:
					break;

				case CloseCommand.Step.UpdateLockingState:
					// 1b.Step: Sent info to backend
					BikesViewModel.ActionText = AppResources.ActivityTextStartingUpdatingLockingState;
					BikesViewModel.RentalProcess.StepInfoText = AppResources.MarkingRentalProcessCloseLockStepUpload;
					BikesViewModel.RentalProcess.ImportantStepInfoText = AppResources.MarkingRentalProcessCloseLockCheckLock;
					break;
			}
		}

		/// <summary>
		/// Processes the close lock state.
		/// </summary>
		/// <param name="state">State to process.</param>
		/// <param name="details">Textual details describing current state.</param>
		public async Task ReportStateAsync(CloseCommand.State state, string details)
		{
			switch (state)
			{
				case CloseCommand.State.OutOfReachError:
					BikesViewModel.RentalProcess.Result = CurrentStepStatus.Failed;
					BikesViewModel.ActionText = string.Empty;
					await ViewService.DisplayAlert(
						AppResources.ErrorCloseLockTitle,
						AppResources.ErrorLockOutOfReach,
						AppResources.MessageAnswerOk);
					break;

				case CloseCommand.State.CouldntCloseMovingError:
					BikesViewModel.RentalProcess.Result = CurrentStepStatus.Failed;
					BikesViewModel.ActionText = string.Empty;
					await ViewService.DisplayAlert(
						AppResources.ErrorCloseLockTitle,
						AppResources.ErrorLockMoving,
						AppResources.MessageAnswerOk);
					break;

				case CloseCommand.State.CouldntCloseBoltBlockedError:
					BikesViewModel.RentalProcess.Result = CurrentStepStatus.Failed;
					BikesViewModel.ActionText = string.Empty;
					await ViewService.DisplayAlert(
						AppResources.ErrorCloseLockTitle,
						AppResources.ErrorCloseLockBoltBlocked,
						AppResources.MessageAnswerOk);
					break;

				case CloseCommand.State.GeneralCloseError:
					BikesViewModel.RentalProcess.Result = CurrentStepStatus.Failed;
					BikesViewModel.ActionText = string.Empty;
					await ViewService.DisplayAlert(
						AppResources.ErrorCloseLockTitle,
						details,
						AppResources.MessageAnswerOk);
					break;

				case CloseCommand.State.WebConnectFailed:
					BikesViewModel.ActionText = AppResources.ActivityTextErrorNoWebUpdateingLockstate;
					break;

				case CloseCommand.State.ResponseIsInvalid:
					BikesViewModel.ActionText = AppResources.ActivityTextErrorStatusUpdateingLockstate;
					break;

				case CloseCommand.State.BackendUpdateFailed:
					BikesViewModel.ActionText = AppResources.ActivityTextErrorConnectionUpdateingLockstate;
					break;
			}
		}

		/// <summary>
		/// Processes the start reservation progress.
		/// </summary>
		/// <param name="step">Current step to process.</param>
		public void ReportStep(CancelReservationCommand.Step step)
		{
			switch (step)
			{
				case CancelReservationCommand.Step.CancelReservation:
					BikesViewModel.RentalProcess.StepInfoText = AppResources.MarkingRentalProcessCancelReservation;
					BikesViewModel.ActionText = AppResources.ActivityTextCancelingReservation;
					break;
			}
		}

		/// <summary>
		/// Processes the start reservation state.
		/// </summary>
		/// <param name="state">State to process.</param>
		/// <param name="details">Textual details describing current state.</param>
		public async Task ReportStateAsync(CancelReservationCommand.State state, string details)
		{
			switch (state)
			{
				case CancelReservationCommand.State.InvalidResponse:
					BikesViewModel.RentalProcess.Result = CurrentStepStatus.Failed;
					BikesViewModel.ActionText = string.Empty;
					await ViewService.DisplayAlert(
						AppResources.ErrorCancelReservationTitle,
						AppResources.ErrorAccountInvalidAuthorization,
						AppResources.MessageAnswerOk);
					break;

				case CancelReservationCommand.State.WebConnectFailed:
					BikesViewModel.RentalProcess.Result = CurrentStepStatus.Failed;
					BikesViewModel.ActionText = string.Empty;
					await ViewService.DisplayAlert(
						AppResources.ErrorNoConnectionTitle,
						AppResources.ErrorNoWeb,
						AppResources.MessageAnswerOk);
					break;

				case CancelReservationCommand.State.GeneralCancelReservationError:
					BikesViewModel.RentalProcess.Result = CurrentStepStatus.Failed;
					BikesViewModel.ActionText = string.Empty;
					await ViewService.DisplayAdvancedAlert(
						AppResources.ErrorCancelReservationTitle,
						details,
						AppResources.ErrorTryAgain,
						AppResources.MessageAnswerOk);
					break;
			}
		}

		/// <summary>
		/// Processes the disconnect from lock progress.
		/// </summary>
		/// <param name="step">Current step to process.</param>
		public void ReportStep(DisconnectCommand.Step step)
		{
			switch (step)
			{
				case DisconnectCommand.Step.DisconnectLock:
					BikesViewModel.RentalProcess.StepInfoText = AppResources.MarkingRentalProcessCloseLockStepUpload;
					BikesViewModel.ActionText = AppResources.ActivityTextDisconnectingLock;
					break;
			}
		}

		/// <summary>
		/// Processes the disconnect from lock state.
		/// </summary>
		/// <param name="state">State to process.</param>
		/// <param name="details">Textual details describing current state.</param>
		public async Task ReportStateAsync(DisconnectCommand.State state, string details)
		{
			switch (state)
			{

				case DisconnectCommand.State.GeneralDisconnectError:
					BikesViewModel.RentalProcess.Result = CurrentStepStatus.Failed;
					BikesViewModel.ActionText = string.Empty;
					await ViewService.DisplayAdvancedAlert(
						AppResources.ErrorAccountInvalidAuthorization,
						details,
						AppResources.ErrorTryAgain,
						AppResources.MessageAnswerOk);
					break;
			}
		}

		/// <summary> Close lock in order to pause ride and update COPRI lock state.</summary>
		public async Task CloseLockAsync()
		{
			Log.ForContext<T>().Information("User request to close lock of bike {bikeId}.", SelectedBike.Id);

			// lock GUI
			BikesViewModel.IsIdle = false;

			// Stop Updater
			BikesViewModel.ActionText = AppResources.ActivityTextOneMomentPlease;
			var stopPollingTask = ViewUpdateManager().StopAsync();

			// Clear logging memory sink to avoid passing log data not related to returning of bike to backend.
			// Log data is passed to backend when calling CopriCallsHttps.DoReturn().
			MemoryStackSink.ClearMessages();

			// 1. Step
			// Parameter for RentalProcess View
			switch(SelectedBike.State.Value)
			{
				case Model.State.InUseStateEnum.Reserved:
					BikesViewModel.StartRentalProcess(new RentalProcessViewModel(SelectedBike.Id)
					{
						State = CurrentRentalProcess.CloseLockAndCancelReservation,
						StepIndex = 1,
						Result = CurrentStepStatus.None
					});
					break;

				case Model.State.InUseStateEnum.Disposable:
					BikesViewModel.StartRentalProcess(new RentalProcessViewModel(SelectedBike.Id)
					{
						State = CurrentRentalProcess.CloseDisposableLock,
						StepIndex = 1,
						Result = CurrentStepStatus.None
					});
					break;

				default:
					BikesViewModel.StartRentalProcess(new RentalProcessViewModel(SelectedBike.Id)
					{
						State = CurrentRentalProcess.CloseLock,
						StepIndex = 1,
						Result = CurrentStepStatus.None
					});
					break;

			}

			// Close Lock
			BikesViewModel.RentalProcess.StepInfoText = AppResources.MarkingRentalProcessCloseLockStepCloseLock;
			BikesViewModel.RentalProcess.ImportantStepInfoText = AppResources.MarkingRentalProcessCloseLockObserve;

			try
			{
#if USELOCALINSTANCE
				var command = new CloseCommand(SelectedBike, GeolocationService, LockService, IsConnectedDelegate, ConnectorFactory, ViewUpdateManager);
				await command.Invoke(this);
#else
				await SelectedBike.CloseLockAsync(this, stopPollingTask);
#endif
				Log.ForContext<T>().Information("Lock of bike {bikeId} closed successfully.", SelectedBike.Id);
			}
			catch (Exception exception)
			{
				Log.ForContext<T>().Information("Lock of bike {bikeId} can not be closed. {@exception}", SelectedBike.Id, exception);

				BikesViewModel.ActionText = AppResources.ActivityTextOneMomentPlease;
				await ViewUpdateManager().StartAsync();

				BikesViewModel.ActionText = string.Empty;
				BikesViewModel.RentalProcess.State = CurrentRentalProcess.None;
				BikesViewModel.IsIdle = true;
				return;
			}
			BikesViewModel.RentalProcess.Result = CurrentStepStatus.Succeeded;

			// 2. Step
			BikesViewModel.RentalProcess.StepIndex = 2;
			BikesViewModel.RentalProcess.Result = CurrentStepStatus.None;
			BikesViewModel.RentalProcess.ImportantStepInfoText = String.Empty;


			if (SelectedBike.State.Value == Model.State.InUseStateEnum.Reserved)
			{
				// Cancel reservation
				try
				{
#if USELOCALINSTANCE
			var command = new CancelReservationCommand(SelectedBike, ConnectorFactory, ViewUpdateManager);
			await command.Invoke(this);
#else
					await SelectedBike.CancelReservationAsync(this);
#endif
				}
				catch (Exception exception)
				{
					Log.ForContext<T>().Information("Reservation of bike {bikeId} could not be canceled. {@exception}", SelectedBike.Id, exception);
				}
			}

			// If bike is not reserved/booked, disconnect lock
			if (SelectedBike.State.Value == Model.State.InUseStateEnum.Disposable)
			{
				try
				{
#if USELOCALINSTANCE
			var command = new DisconnectCommand(SelectedBike, ConnectorFactory, ViewUpdateManager);
			await command.Invoke(this);
#else
					await SelectedBike.DisconnectAsync(this);
#endif
				}
				catch (Exception exception)
				{
					Log.ForContext<T>().Information("Lock of bike {bikeId} could not be disconnected. {@exception}", SelectedBike.Id, exception);
				}
			}
			else
			{
				// Question if park bike or end rental
				IsEndRentalRequested = await ViewService.DisplayAlert(
					AppResources.QuestionRentalProcessCloseLockEndOrContinueTitle,
					AppResources.QuestionRentalProcessCloseLockEndOrContinueText,
					AppResources.ActionEndRental,
					AppResources.QuestionRentalProcessCloseLockContinueRentalAnswer);

				BikesViewModel.RentalProcess.Result = CurrentStepStatus.Succeeded;

				// Message for parking bike
				if (IsEndRentalRequested == false)
				{
					Log.ForContext<T>().Information("User request to park bike {bikeId}.", SelectedBike.Id);
					await ViewService.DisplayAlert(
						AppResources.MessageRentalProcessCloseLockFinishedTitle,
						AppResources.MessageRentalProcessCloseLockFinishedText,
						AppResources.MessageAnswerOk);
				}
			}

			BikesViewModel.ActionText = AppResources.ActivityTextOneMomentPlease;
			await ViewUpdateManager().StartAsync();
			BikesViewModel.ActionText = string.Empty;

			BikesViewModel.RentalProcess.State = CurrentRentalProcess.None;
			BikesViewModel.IsIdle = true;
			return;
		}

		/// <summary>
		/// Default value of user request to end rental = false.
		/// </summary>
		private bool isEndRentalRequested = false;

		/// <summary>
		/// True if user requested End rental.
		/// </summary>
		public bool IsEndRentalRequested
		{
			get { return isEndRentalRequested; }
			set
			{
				isEndRentalRequested = value;
				PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(IsEndRentalRequested)));
			}
		}
	}
}