namespace Kbx.Shared.Providers;

public sealed class KisRequestPacer
{
    private readonly SemaphoreSlim _gate = new(1,1);
    private DateTimeOffset _last = DateTimeOffset.MinValue;
    public async ValueTask WaitAsync(bool sandbox, CancellationToken ct)
    {
        await _gate.WaitAsync(ct);
        try
        {
            var spacing = TimeSpan.FromMilliseconds(sandbox ? 1000 : 100); // KBX conservative default; official production max is higher.
            var remaining = spacing - (DateTimeOffset.UtcNow - _last);
            if (remaining > TimeSpan.Zero) await Task.Delay(remaining, ct);
            _last = DateTimeOffset.UtcNow;
        }
        finally { _gate.Release(); }
    }
}