using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Data;

namespace RegionOfInterestChannels
{
    public class StateListIndexConverter : IMultiValueConverter
    {
        public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            if (null == values || values.Length != 2)
                return null;

            if (!(values[1] is int idx) || !(values[0] is IEnumerable<State> states) || states.Count() <= idx)
                return null;

            return states.ElementAt(idx);
        }

        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}