using NATS.Server.Auth;

namespace NATS.Server.Tests;

public class ResponseTrackerTests
{
    [Fact]
    public void Allows_reply_subject_after_registration()
    {
        var tracker = new ResponseTracker(maxMsgs: 1, expires: TimeSpan.FromMinutes(5));
        tracker.RegisterReply("_INBOX.abc123");
        tracker.IsReplyAllowed("_INBOX.abc123").ShouldBeTrue();
    }

    [Fact]
    public void Denies_unknown_reply_subject()
    {
        var tracker = new ResponseTracker(maxMsgs: 1, expires: TimeSpan.FromMinutes(5));
        tracker.IsReplyAllowed("_INBOX.unknown").ShouldBeFalse();
    }

    [Fact]
    public void Enforces_max_messages()
    {
        var tracker = new ResponseTracker(maxMsgs: 2, expires: TimeSpan.FromMinutes(5));
        tracker.RegisterReply("_INBOX.abc");
        tracker.IsReplyAllowed("_INBOX.abc").ShouldBeTrue();
        tracker.IsReplyAllowed("_INBOX.abc").ShouldBeTrue();
        tracker.IsReplyAllowed("_INBOX.abc").ShouldBeFalse(); // exceeded
    }

    [Fact]
    public void Enforces_expiry()
    {
        var tracker = new ResponseTracker(maxMsgs: 0, expires: TimeSpan.FromMilliseconds(1));
        tracker.RegisterReply("_INBOX.abc");
        Thread.Sleep(50);
        tracker.IsReplyAllowed("_INBOX.abc").ShouldBeFalse();
    }

    [Fact]
    public void Prune_removes_expired()
    {
        var tracker = new ResponseTracker(maxMsgs: 0, expires: TimeSpan.FromMilliseconds(1));
        tracker.RegisterReply("_INBOX.a");
        tracker.RegisterReply("_INBOX.b");
        Thread.Sleep(50);
        tracker.Prune();
        tracker.Count.ShouldBe(0);
    }
}