Function recordReadingHistory

Source

export function recordReadingHistory(entries: ReadingHistoryEntry[]): void {
  if (!entries.length) return;

  const history = getReadingHistory();
  const now = Date.now();

  // Create a map of existing entries by mangaId and date for deduplication (using local date)
  const existingMap = new Map<string, ReadingHistoryEntry>();
  for (const entry of history.entries) {
    const entryDate = getLocalDateString(entry.timestamp);
    const key = `${entry.mangaId}_${entryDate}`;
    existingMap.set(key, entry);
  }

  // Add or update entries
  for (const entry of entries) {
    const entryDate = getLocalDateString(entry.timestamp);
    const key = `${entry.mangaId}_${entryDate}`;

    // Only update if chapters changed or it's a new entry
    const existing = existingMap.get(key);
    if (!existing || existing.chaptersRead !== entry.chaptersRead) {
      existingMap.set(key, entry);
    }
  }

  // Convert back to array and sort by timestamp (newest first)
  const allEntries = Array.from(existingMap.values()).sort(
    (a, b) => b.timestamp - a.timestamp,
  );

  // Enforce maximum entries limit per manga to avoid disproportionate truncation
  const entriesByManga = new Map<string | number, ReadingHistoryEntry[]>();
  for (const entry of allEntries) {
    if (!entriesByManga.has(entry.mangaId)) {
      entriesByManga.set(entry.mangaId, []);
    }
    entriesByManga.get(entry.mangaId)!.push(entry);
  }

  // Trim each manga's history to max entries, keeping newest
  const maxPerManga = 365;
  const trimmedEntries: ReadingHistoryEntry[] = [];
  for (const mangaEntries of entriesByManga.values()) {
    if (mangaEntries.length > maxPerManga) {
      trimmedEntries.push(...mangaEntries.slice(0, maxPerManga));
    } else {
      trimmedEntries.push(...mangaEntries);
    }
  }

  // Sort final list by timestamp (newest first)
  trimmedEntries.sort((a, b) => b.timestamp - a.timestamp);

  const updatedHistory: ReadingHistory = {
    entries: trimmedEntries,
    lastUpdated: now,
    version: 1,
  };

  saveReadingHistory(updatedHistory);
}
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