using Xunit;
using ytLive.Models;

namespace ytLive.Tests;

/// <summary>The session is the only scope the scoreboard promises, so the rules are: a start clears
/// everything, events outside a session are ignored, and an ended session keeps its numbers but
/// stops moving.</summary>
public class ScoreboardRecorderTests
{
    private static ChatMessage Member(string name) => new() { Kind = ChatEventKind.NewMember, AuthorName = name };

    [Fact]
    public void Starting_a_session_clears_the_tallies_and_only_a_live_session_counts()
    {
        var recorder = new ScoreboardRecorder();
        var changes = 0;
        recorder.Changed += () => changes++;

        // Outside a session: nothing is counted (no stale carry-over from the last stream).
        recorder.Record(Member("Ignored"));
        Assert.Equal(0, recorder.State.NewMembers);

        recorder.StartSession();
        Assert.True(recorder.IsRunning);
        recorder.Record(Member("First"));
        recorder.Record(Member("Second"));
        Assert.Equal(2, recorder.State.NewMembers);
        Assert.True(changes >= 2, "each visible change must raise Changed so the strip re-renders");

        // End freezes: numbers stay, movement stops.
        recorder.EndSession();
        Assert.False(recorder.IsRunning);
        recorder.Record(Member("AfterEnd"));
        Assert.Equal(2, recorder.State.NewMembers);

        // The next session starts from zero.
        recorder.StartSession();
        Assert.Equal(0, recorder.State.NewMembers);
        Assert.Null(recorder.State.LastMemberName);
    }
}