using System.Globalization;

namespace Atomx.Admin.Client.Services
{
    public interface ILocalizationService
    {
        /// <summary>
        /// 获取当前文化环境
        /// </summary>d
        CultureInfo CurrentCulture { get; }

        /// <summary>
        /// 当语言发生改变时触发的事件。
        /// </summary>
        event EventHandler<CultureInfo> LanguageChanged;

        /// <summary>
        /// 当语言发生改变时触发的事件。调用 <see cref="InteractiveStringLocalizer"/> 来更改语言环境。
        /// </summary>
        /// <param name="culture"></param>
        void SetLanguage(CultureInfo culture);
    }


    public class LocalizationService : ILocalizationService
    {
        private CultureInfo? _currentCulture;

        /// <summary>
        /// 获取当前文化环境
        /// </summary>
        public CultureInfo CurrentCulture => _currentCulture ?? CultureInfo.CurrentCulture;

        public event EventHandler<CultureInfo> LanguageChanged = default!;

        public void SetLanguage(CultureInfo culture)
        {
            if (!culture.Equals(CultureInfo.CurrentCulture))
            {
                CultureInfo.CurrentCulture = culture;
            }

            if (_currentCulture == null || !_currentCulture.Equals(culture))
            {
                _currentCulture = culture;
                CultureInfo.DefaultThreadCurrentCulture = culture;
                CultureInfo.DefaultThreadCurrentUICulture = culture;

                LanguageChanged?.Invoke(this, culture);
            }
        }
    }
}