using System.Net.Http;

namespace AxCopilot.Services;

internal static class WeatherWidgetService
{
    private static string? _cached;
    private static DateTime _cacheTime = DateTime.MinValue;
    private static bool _fetching;
    private static readonly TimeSpan Ttl = TimeSpan.FromMinutes(30);

    public static string CachedText => _cached ?? "--";

    public static async Task RefreshAsync(bool internalMode)
    {
        if (internalMode)
        {
            _cached = "--";
            return;
        }

        if (_cached != null && DateTime.Now - _cacheTime < Ttl)
            return;
        if (_fetching)
            return;

        _fetching = true;
        try
        {
            using var client = new HttpClient();
            client.Timeout = TimeSpan.FromSeconds(6);
            var raw = await client.GetStringAsync("https://wttr.in/?format=%c+%t");
            _cached = raw.Trim().Replace("+", " ");
            _cacheTime = DateTime.Now;
        }
        catch (Exception ex)
        {
            LogService.Warn($"날씨 위젯 갱신 실패: {ex.Message}");
            _cached ??= "--";
        }
        finally
        {
            _fetching = false;
        }
    }

    public static void Invalidate()
    {
        _cached = null;
        _cacheTime = DateTime.MinValue;
    }
}