using Microsoft.Extensions.Localization;
using System.Globalization;

namespace Atomx.Admin.Client.Services
{
    /// <summary>
    /// 基于 ILocalizationProvider 的 IStringLocalizer 实现：
    /// 使用 JSON 文件中的键值，未找到返回 key 本身。
    /// 名称改为 JsonStringLocalizer 避免与框架的 StringLocalizer 冲突。
    /// </summary>
    public class JsonStringLocalizer<T> : IStringLocalizer<T>
    {
        private readonly ILocalizationProvider _provider;

        public JsonStringLocalizer(ILocalizationProvider provider)
        {
            _provider = provider;
        }

        public LocalizedString this[string name]
        {
            get
            {
                var value = _provider.GetString(name);
                if (value == null)
                {
                    // Avoid synchronous blocking during server prerender. Start background load and return key.
                    try
                    {
                        _ = _provider.LoadCultureAsync(_provider.CurrentCulture);
                    }
                    catch { }
                }

                var result = value ?? name;
                return new LocalizedString(name, result, resourceNotFound: result == name);
            }
        }

        public LocalizedString this[string name, params object[] arguments]
        {
            get
            {
                var fmt = _provider.GetString(name);
                if (fmt == null)
                {
                    try
                    {
                        _ = _provider.LoadCultureAsync(_provider.CurrentCulture);
                    }
                    catch { }
                }

                var format = fmt ?? name;
                var value = string.Format(format, arguments);
                return new LocalizedString(name, value, resourceNotFound: format == name);
            }
        }

        public IEnumerable<LocalizedString> GetAllStrings(bool includeParentCultures)
        {
            var list = new List<LocalizedString>();
            var providerType = _provider.GetType();
            var currentProp = providerType.GetProperty("CurrentCulture");
            var culture = currentProp?.GetValue(_provider) as string ?? string.Empty;
            var cacheField = providerType.GetField("_cache", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
            if (!string.IsNullOrEmpty(culture) && cacheField?.GetValue(_provider) is Dictionary<string, Dictionary<string, string>> cache && cache.TryGetValue(culture, out var dict))
            {
                foreach (var kv in dict)
                {
                    list.Add(new LocalizedString(kv.Key, kv.Value, resourceNotFound: false));
                }
            }
            return list;
        }

        public IStringLocalizer WithCulture(CultureInfo culture)
        {
            return this;
        }
    }
}