using System.ComponentModel;
using TINK.Model;

namespace TINK.ViewModel.Bikes
{
	public enum CurrentRentalProcess
	{
		None = 0,
		ReserveBike = 1,
		StartRental = 2,
		OpenLock = 3,
		CloseLock = 4,
		EndRental = 5,
	}

	public enum CurrentStepStatus
	{
		None = 0,
		Succeeded = 1,
		Failed = 2,
	}

	public class RentalProcessViewModel : IRentalProcessViewModel, INotifyPropertyChanged
	{
		public event PropertyChangedEventHandler PropertyChanged;

		public RentalProcessViewModel(string bikeId = null) => BikeId = bikeId ?? string.Empty;

		/// <summary>
		/// Loads rental process view model from source.
		/// </summary>
		/// <param name="processViewModel">Source object to load from </param>
		public void LoadFrom(IRentalProcessViewModel processViewModel)
		{
			BikeId = processViewModel.BikeId;
			_state = processViewModel.State;
			_stepIndex = processViewModel.StepIndex;
			_stepInfoText = processViewModel.StepInfoText;
			_importantStepInfoText = processViewModel.ImportantStepInfoText;
			_result = processViewModel.Result;
			EndRentalInfo = processViewModel.EndRentalInfo;
		}

		/// <summary>
		/// Gets the id of the bike which is rental ends.
		/// </summary>
		public string BikeId { get; private set; }

		/// <summary> Holds info about active rental process. </summary>
		private CurrentRentalProcess _state = CurrentRentalProcess.None;

		/// <summary> Holds info about active rental process. </summary>
		public CurrentRentalProcess State
		{
			get => _state;
			set
			{
				if (_state == value) { return; }

				_state = value;

				if (value == CurrentRentalProcess.None)
				{
					StepIndex = null;
					Result = CurrentStepStatus.None;
				}
				PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(State)));
				PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(StepIndex)));
				PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(Result)));
			}
		}

		/// <summary> Holds info about current step in rental process. </summary>
		private int? _stepIndex;

		/// <summary> Holds info about current step in rental process. </summary>
		public int? StepIndex
		{
			get => _stepIndex;
			set
			{
				if (_stepIndex == value) { return; }

				_stepIndex = value;
				PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(StepIndex)));
			}
		}

		/// <summary> Holds info about current step. </summary>
		private string _stepInfoText;

		/// <summary> Holds info about current step. </summary>
		public string StepInfoText
		{
			get => _stepInfoText;
			set
			{
				if (value == _stepInfoText)
					return;

				_stepInfoText = value;
				PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(StepInfoText)));
			}
		}

		/// <summary> Holds important info about current step. </summary>
		private string _importantStepInfoText;

		/// <summary> Holds important info about current step. </summary>
		public string ImportantStepInfoText
		{
			get => _importantStepInfoText;
			set
			{
				if (value == _importantStepInfoText)
					return;

				_importantStepInfoText = value;
				PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(ImportantStepInfoText)));
			}
		}

		/// <summary> Holds info about status of current rental process. </summary>
		private CurrentStepStatus _result = CurrentStepStatus.None;

		/// <summary> Holds info about status of current rental process. </summary>
		public CurrentStepStatus Result
		{
			get => _result;
			set
			{
				if (_result == value) { return; }

				_result = value;
				PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(Result)));
			}
		}

		/// <summary>
		/// Holds the info returned from back end when rent is ended.
		/// </summary>
		public BookingFinishedModel EndRentalInfo { get; set; }

	}
}