RateLimitBadge.razor

@*
   In the name of God, the Merciful, the Compassionate
   Visible only when RateLimiter is currently throttling. Polls every 5s
   so the badge appears within seconds of throttling kicking in and clears
   itself when the sliding window drains.
*@
@inject SQLTriage.Data.RateLimiter RateLimiter
@implements IDisposable

@if (_throttled)
{
    <div class="ratelimit-badge" title="@_tooltip">
        <i class="fa-solid fa-gauge-high"></i>
        <span>@_label</span>
    </div>
}

@code {
    private bool _throttled;
    private string _label = "";
    private string _tooltip = "";
    private System.Threading.Timer? _timer;

    protected override void OnInitialized()
    {
        Refresh();
        _timer = new System.Threading.Timer(_ =>
        {
            _ = InvokeAsync(() =>
            {
                Refresh();
                StateHasChanged();
            });
        }, null, TimeSpan.FromSeconds(5), TimeSpan.FromSeconds(5));
    }

    private void Refresh()
    {
        var queryThrottled = RateLimiter.IsRateLimited;
        var connThrottled  = RateLimiter.IsConnectionRateLimited;
        _throttled = queryThrottled || connThrottled;

        if (!_throttled) return;

        // Compose a compact label + a fuller tooltip. Show the *closer*
        // reset window so the user knows roughly when they'll be unblocked.
        var parts = new List<string>();
        if (queryThrottled)
            parts.Add($"Queries {RateLimiter.CurrentQueryCount}/{RateLimiter.MaxQueriesPerMinute}/min");
        if (connThrottled)
            parts.Add($"Conns {RateLimiter.CurrentConnectionAttemptCount}/{RateLimiter.MaxConnectionAttemptsPerMinute}/min");
        _label = "Throttled";

        var resetQ = RateLimiter.GetTimeToReset();
        var resetC = RateLimiter.GetConnectionTimeToReset();
        var nextReset = (queryThrottled, connThrottled) switch
        {
            (true, true)  => resetQ < resetC ? resetQ : resetC,
            (true, false) => resetQ,
            (false, true) => resetC,
            _ => TimeSpan.Zero
        };
        _tooltip = string.Join("\n", parts) + $"\nResets in ~{(int)nextReset.TotalSeconds}s";
    }

    public void Dispose()
    {
        _timer?.Dispose();
    }
}