using System;
using System.Collections.Generic;
using System.Globalization;
using System.Text;
using Microsoft.UI.Xaml.Data;
using Microsoft.UI.Xaml.Markup;

namespace WinWARP.Ui.Converters;

[MarkupExtensionReturnType(ReturnType = typeof(IValueConverter))]
public class LanguageCodeToNameConverter : MarkupExtension, IValueConverter
{
    protected override object ProvideValue() => this;

    public object Convert(object value, Type targetType, object parameter, string language)
    {
        if (value is string languageCode && !string.IsNullOrWhiteSpace(languageCode))
        {
            try
            {
                CultureInfo culture = new CultureInfo(languageCode);

                // DisplayName returns "English (United States)"
                // NativeName returns "English (United States)" or "Español (España)"
                return culture.NativeName;
            }
            catch (CultureNotFoundException)
            {
                return value;
            }
        }
        return string.Empty;
    }

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