using System;
using System.Globalization;
using TINK.Model.User.Account;
using Xamarin.Forms;

namespace TINK.View.Settings
{
	/// <summary> Translates user permissions into visibility state. </summary>
	public class PermissionToVisibleConverter : BindableObject, IValueConverter
	{
		static readonly BindableProperty VisibleFlagProperty =
			BindableProperty.Create(nameof(VisibleFlag), typeof(Permissions), typeof(BindableObject));

		/// <summary> Property set from XAML determinig for which permission value object is visible.</summary>
		public Permissions VisibleFlag
		{
			get => (Permissions)GetValue(VisibleFlagProperty);
			set => SetValue(VisibleFlagProperty, value);
		}

		/// <summary> Converts permission value into visible state.</summary>
		/// <param name="value">Permission value from view model used to derive whether object is visible or not.</param>
		/// <returns>Boolean value indicating whether object is visible or not.</returns>
		public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
		{
			return ((Permissions)value).HasFlag(VisibleFlag);
		}

		public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
		{
			return Permissions.None;
		}
	}
}