namespace Mr.BrickAdventures.Progression;

/// <summary>
/// Collects the events an aggregate raises until someone drains them. Composed rather than
/// inherited — aggregates own one, they are not a kind of it.
/// </summary>
internal sealed class EventLog
{
    private readonly List<ProgressionEvent> _events = new();

    public void Raise(ProgressionEvent @event) => _events.Add(@event);

    public IReadOnlyList<ProgressionEvent> Drain()
    {
        var drained = _events.ToList();
        _events.Clear();
        return drained;
    }
}