LanguageTypeToXmlLanguageConverter.cs

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using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Data;
using System.Windows.Markup;
using Dreamine.UI.Wpf.Localization;
 
namespace Dreamine.UI.Wpf.Converters
{
    public sealed class LanguageToXmlLanguageConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            var lang = value as Language? ?? Language.Korean;
 
            // 필요 시 세부 로케일 문자열 수정 가능 (예: zh-Hant-TW 등)
            var tag = lang switch
            {
                Language.English => "en-US",
                Language.Korean => "ko-KR",
                Language.Chinese => "zh-CN",
                Language.Vietnamese => "vi-VN",
                _ => "ko-KR"
            };
 
            return XmlLanguage.GetLanguage(tag);
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is XmlLanguage xml)
            {
                var tag = xml.IetfLanguageTag.ToLowerInvariant();
                if (tag.StartsWith("en")) return Language.English;
                if (tag.StartsWith("ko")) return Language.Korean;
                if (tag.StartsWith("zh")) return Language.Chinese;
                if (tag.StartsWith("vi")) return Language.Vietnamese;
            }
            return Language.Korean;
        }
    }
}