gramps
6b6ccd7b0a
ScoreboardRecorder owns the one scope the numbers promise. StartSession resets and marks running; Record ignores everything outside a session (a stale tally from the last stream is exactly the 'today' lie this design avoids); EndSession freezes the numbers but stops them moving, so an End screen can still show them. Changed fires only when a displayed value actually moves, which is what keeps the strip's raster cache honest.
52 lines
2.0 KiB
C#
52 lines
2.0 KiB
C#
namespace ytLive.Models;
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/// <summary>Owns the session's <see cref="ScoreboardState"/> and the one lifecycle rule that
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/// matters: a new session starts from zero.
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///
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/// <para>Kept separate from the view-model so the rule is testable without a window, and so the
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/// scoreboard layer has exactly one place that decides when counting begins.</para></summary>
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public sealed class ScoreboardRecorder
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{
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public ScoreboardState State { get; private set; } = new();
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/// <summary>Called when a session starts (go-live, test, or a local recording). Every start
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/// clears the tallies — "session" is the only scope the numbers promise.</summary>
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public void StartSession()
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{
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State = new ScoreboardState();
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IsRunning = true;
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RaiseChanged();
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}
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/// <summary>Folds a chat event in. Outside a session nothing is counted: a stale tally left over
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/// from the last stream would be the "today" lie this design exists to avoid.</summary>
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public void Record(ChatMessage message)
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{
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if (!IsRunning) return;
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var before = Fingerprint(State);
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State.Apply(message);
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if (Fingerprint(State) != before) RaiseChanged();
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}
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/// <summary>True while the tallies are live.</summary>
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public bool IsRunning { get; private set; }
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/// <summary>Marks the session finished. The tallies stay visible (the End screen may show
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/// them) but stop moving.</summary>
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public void EndSession()
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{
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IsRunning = false;
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RaiseChanged();
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}
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public event System.Action? Changed;
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private void RaiseChanged() => Changed?.Invoke();
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/// <summary>Cheap change detector: only re-render the strip when a displayed value moved.</summary>
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private static string Fingerprint(ScoreboardState state) =>
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$"{state.NewMembers}|{state.MilestoneCount}|{state.LastMemberName}|{state.LastGifterName}|" +
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$"{state.LastGiftCount}|{state.LastSuperChatAuthor}|{state.LastSuperChatDisplay}|" +
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$"{state.SessionTotal.Currency}|{state.SessionTotal.Total:0.######}";
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}
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