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

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;
        }
    }
}