export interface HistoryEntry {
  mangaId:       number;
  mangaTitle:    string;
  thumbnailUrl:  string;
  chapterId:     number;
  chapterName:   string;
  chapterNumber: number;
  pageNumber:    number;
  readAt:        number;
}

export interface ReadingStats {
  currentStreakDays:  number;
  totalChaptersRead:  number;
  totalMinutesRead:   number;
  totalMangaRead:     number;
  longestStreakDays:  number;
}

export const homeState = $state({
  history:         [] as HistoryEntry[],
  dailyReadCounts: {} as Record<string, number>,
  stats: {
    currentStreakDays:  0,
    totalChaptersRead:  0,
    totalMinutesRead:   0,
    totalMangaRead:     0,
    longestStreakDays:  0,
  } as ReadingStats,
  heroSlots: [null, null, null, null] as [number | null, number | null, number | null, number | null],
});

export function setHeroSlot(i: 1 | 2 | 3, mangaId: number | null) {
  homeState.heroSlots[i] = mangaId;
}

export function recordRead(entry: HistoryEntry) {
  homeState.history = [entry, ...homeState.history.filter(e => e.chapterId !== entry.chapterId)];
  const dateStr = new Date(entry.readAt).toISOString().slice(0, 10);
  homeState.dailyReadCounts[dateStr] = (homeState.dailyReadCounts[dateStr] ?? 0) + 1;
  homeState.stats.totalChaptersRead++;
}