const DRAFT_KEY_PREFIX = 'recall_draft_'
const DRAFT_TTL = 7 * 24 * 60 * 60 * 1000 // 7 days

interface Draft {
  title: string
  content: string
  type: string
  tags: string[]
  savedAt: number
}

export function saveDraft(noteId: string, data: Draft): void {
  if (typeof window === 'undefined') return
  localStorage.setItem(DRAFT_KEY_PREFIX + noteId, JSON.stringify({ ...data, savedAt: Date.now() }))
}

export function loadDraft(noteId: string): Draft | null {
  if (typeof window === 'undefined') return null
  const stored = localStorage.getItem(DRAFT_KEY_PREFIX + noteId)
  if (!stored) return null
  try {
    const draft = JSON.parse(stored) as Draft
    if (Date.now() - draft.savedAt > DRAFT_TTL) {
      deleteDraft(noteId)
      return null
    }
    return draft
  } catch {
    return null
  }
}

export function deleteDraft(noteId: string): void {
  if (typeof window === 'undefined') return
  localStorage.removeItem(DRAFT_KEY_PREFIX + noteId)
}