using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Data;
using System.Globalization;
using System.Windows.Media;

namespace SudokuWeek4.Models.Converters
{
    internal class OptionsValueConverter : IValueConverter
    {
        private static readonly OptionsValueConverter _instance = new OptionsValueConverter();

        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (!(value is HashSet<int>) || targetType != typeof(Brush) || !(parameter is int))
                throw new InvalidCastException();

            HashSet<int> set = (HashSet<int>)value;
            int number = (int)parameter;

            if (set.Contains(number) && BoardModel.CheatMode)
                return NumberBrushes.GetBrush(number, Constants.CheatActivedFontColor);
            else
                return Brushes.Transparent;
        }

        // Create a property to get the instance of the OptionsValue
        public static OptionsValueConverter Instance
        {
            get { return _instance; }
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}