namespace QuestionsApi.Services.Flashcards;

// Small pure helpers pulled out of FlashcardStudyService/FlashcardScheduleStore so the
// daily-limit and sibling-bury rules can be unit tested without a live Mongo instance.
public static class FlashcardScheduling
{
    // A card reviewed on a given local study day buries its siblings until the next local day.
    public static DateTime NextStudyDayStart(DateTime studyDayStartUtc) => studyDayStartUtc.Date.AddDays(1);

    // Effective per-day budget: deck override wins over the global default, minus what's
    // already been consumed on the client's current local study day.
    public static int ResolveDailyBudget(int globalLimit, int? deckOverride, int consumedToday) =>
        Math.Max(0, (deckOverride ?? globalLimit) - consumedToday);
}