/**
 * Mise en évidence temporaire des carnets créés via IA (wizard, etc.).
 * Les notes ont déjà `autoGenerated` en base ; les carnets n'ont pas ce flag
 * → on stocke un repère local (TTL 7 jours) pour les retrouver facilement.
 */

const STORAGE_KEY = 'memento-ai-created-notebooks'
const TTL_MS = 7 * 24 * 60 * 60 * 1000

type Entry = { id: string; at: number }

function readEntries(): Entry[] {
  if (typeof window === 'undefined') return []
  try {
    const raw = localStorage.getItem(STORAGE_KEY)
    if (!raw) return []
    const parsed = JSON.parse(raw) as Entry[]
    if (!Array.isArray(parsed)) return []
    const now = Date.now()
    return parsed.filter((e) => e?.id && typeof e.at === 'number' && now - e.at < TTL_MS)
  } catch {
    return []
  }
}

function writeEntries(entries: Entry[]) {
  try {
    localStorage.setItem(STORAGE_KEY, JSON.stringify(entries.slice(0, 50)))
  } catch {
    /* quota / private mode */
  }
}

/** Marque un carnet comme créé via IA (repère sidebar ~7 jours). */
export function markAiCreatedNotebook(notebookId: string) {
  if (!notebookId) return
  const now = Date.now()
  const next = [{ id: notebookId, at: now }, ...readEntries().filter((e) => e.id !== notebookId)]
  writeEntries(next)
  if (typeof window !== 'undefined') {
    window.dispatchEvent(new CustomEvent('memento-ai-created-changed'))
  }
}

export function isAiCreatedNotebook(notebookId: string): boolean {
  return readEntries().some((e) => e.id === notebookId)
}

export function listAiCreatedNotebookIds(): Set<string> {
  return new Set(readEntries().map((e) => e.id))
}

/** Note créée récemment (pour point « nouveau » optionnel). */
export function isRecentlyCreated(createdAt: Date | string | null | undefined, hours = 48): boolean {
  if (!createdAt) return false
  const t = typeof createdAt === 'string' ? new Date(createdAt).getTime() : createdAt.getTime()
  if (Number.isNaN(t)) return false
  return Date.now() - t < hours * 60 * 60 * 1000
}