using System.ComponentModel;
using ShareeBike.MultilingualResources;

namespace SharedGui.ViewModel
{
	/// <summary>
	/// Bar based filling level indicator view.
	/// </summary>
	public class BarLevelViewModel : INotifyPropertyChanged
	{
		public event PropertyChangedEventHandler PropertyChanged;

		public int? _Maximum = null;

		/// <summary>
		/// Holds the maximum count of bars.
		/// </summary>
		public int? Maximum
		{
			get => _Maximum;
			set
			{
				if (_Maximum == value)
				{
					// Nothing to do because nothing changed.
					return;
				}

				_Maximum = value;
				PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(IsBatteryChargeLevelLabelVisible)));
				PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(BatteryChargeLevelBarsText)));
				PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(BatteryChargeLevelImageSourceString)));
				PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(IsBatteryChargeLevelImageVisible)));
			}
		}

		public int? _Current = null;

		/// <summary>
		/// Holds the current count of bars.
		/// </summary>
		public int? Current
		{
			get => _Current;
			set
			{
				if (_Current == value)
				{
					// Nothing to do because nothing changed.
					return;
				}

				_Current = value;
				PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(IsBatteryChargeLevelLabelVisible)));
				PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(BatteryChargeLevelBarsText)));
				PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(BatteryChargeLevelImageSourceString)));
				PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(IsBatteryChargeLevelImageVisible)));
			}
		}

		/// <summary>
		/// Gets the battery filling level or pedelecs.
		/// </summary>
		public string BatteryChargeLevelBarsText => Maximum != null
			? string.Format(
				AppResources.MarkingDriveBatteryChargingLevel,
				Current != null ? Current.ToString() : "-",
				Maximum != null ? Maximum.ToString() : "-")
			: AppResources.MarkingDriveBatteryChargingLevelNotAvailable;

		/// <summary>
		/// Gets a value indicating whether battery label is visible or not.
		/// </summary>
		public bool IsBatteryChargeLevelLabelVisible => Maximum.HasValue && Maximum.Value != 5;

		/// <summary>
		/// Gets name of battery image resource.
		/// </summary>
		public string BatteryChargeLevelImageSourceString => Current.HasValue && Maximum.HasValue && Maximum.Value == 5
			? $"battery_{Current.Value}_{Maximum.Value}.png"
			: "battery_undefined.png";

		/// <summary>
		/// Gets a value indicating whether battery image is visible or not.
		/// </summary>
		public bool IsBatteryChargeLevelImageVisible => Maximum.HasValue && Maximum.Value == 5;

	}
}