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import {
type Card as FSRSCard,
type State as FSRSState,
fsrs,
type Grade,
} from "ts-fsrs";
const f = fsrs({ enable_fuzz: true });
export interface ScheduleInput {
state: number;
due: Date;
stability: number;
difficulty: number;
elapsedDays: number;
scheduledDays: number;
reps: number;
lapses: number;
lastReview: Date | null;
}
export interface ScheduleResult {
state: number;
due: Date;
stability: number;
difficulty: number;
elapsedDays: number;
scheduledDays: number;
reps: number;
lapses: number;
lastReview: Date;
/** Days elapsed since the previous review (for ReviewLog). */
reviewElapsedDays: number;
}
export function computeNextSchedule(
card: ScheduleInput,
rating: 1 | 2 | 3 | 4,
now: Date,
): ScheduleResult {
const fsrsCard: FSRSCard = {
due: card.due,
stability: card.stability,
difficulty: card.difficulty,
elapsed_days: card.elapsedDays,
scheduled_days: card.scheduledDays,
reps: card.reps,
lapses: card.lapses,
state: card.state as FSRSState,
last_review: card.lastReview ?? undefined,
learning_steps: 0,
};
const result = f.next(fsrsCard, now, rating as Grade);
const reviewElapsedDays = card.lastReview
? Math.round(
(now.getTime() - card.lastReview.getTime()) / (1000 * 60 * 60 * 24),
)
: 0;
return {
state: result.card.state,
due: result.card.due,
stability: result.card.stability,
difficulty: result.card.difficulty,
elapsedDays: result.card.elapsed_days,
scheduledDays: result.card.scheduled_days,
reps: result.card.reps,
lapses: result.card.lapses,
lastReview: now,
reviewElapsedDays,
};
}
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