Function calculateSyncChanges

Source

export function calculateSyncChanges(
  kenmei: KenmeiMangaData,
  userEntry: UserEntryData | undefined,
  syncConfig: SyncConfig,
): SyncChangesResult {
  const shouldUpdateStatus = (): boolean => {
    if (!userEntry) return true;
    if (syncConfig.prioritizeAniListStatus) return false;
    const effective = getEffectiveStatus(kenmei, syncConfig);
    const preservesCompleted =
      userEntry.status === "COMPLETED" && syncConfig.preserveCompletedStatus;
    return effective !== userEntry.status && !preservesCompleted;
  };

  const shouldUpdateProgress = (): boolean => {
    if (!userEntry) return true;
    const kenmeiProgress = kenmei.chaptersRead || 0;
    const aniProgress = userEntry.progress || 0;
    if (syncConfig.prioritizeAniListProgress) {
      return kenmeiProgress > aniProgress; // only if Kenmei ahead
    }
    return kenmeiProgress !== aniProgress;
  };

  const shouldUpdateScore = (): boolean => {
    const kenmeiScore = Number(kenmei.score || 0);
    if (!userEntry) return kenmeiScore > 0;

    // If preserving completed entries, don't touch score
    if (
      userEntry.status === "COMPLETED" &&
      syncConfig.preserveCompletedStatus
    ) {
      return false;
    }

    // If AniList score is preferred and meaningful, don't change
    if (
      syncConfig.prioritizeAniListScore &&
      userEntry.score &&
      Number(userEntry.score) > 0
    ) {
      return false;
    }

    const aniScore = Number(userEntry.score || 0);
    return (
      kenmeiScore > 0 &&
      (aniScore === 0 || Math.abs(kenmeiScore - aniScore) >= 0.5)
    );
  };

  const statusWillChange = shouldUpdateStatus();
  const progressWillChange = shouldUpdateProgress();
  const scoreWillChange = shouldUpdateScore();

  const isNewEntry = !userEntry;
  const isCompleted = userEntry?.status === "COMPLETED";

  const shouldSetPrivate = userEntry
    ? syncConfig.setPrivate && !userEntry.private
    : syncConfig.setPrivate;
  const changeCount = [
    statusWillChange,
    progressWillChange,
    scoreWillChange,
    shouldSetPrivate,
  ].filter(Boolean).length;

  return {
    statusWillChange,
    progressWillChange,
    scoreWillChange,
    isNewEntry,
    isCompleted,
    changeCount,
  };
}
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