const key = 'safety-last-activity-at'
const throttleMs = 30_000

export const activity = {
  get: () => Number(localStorage.getItem(key) || 0),
  record(force = false) {
    const now = Date.now()
    if (force || now - this.get() >= throttleMs) localStorage.setItem(key, String(now))
  },
  clear: () => localStorage.removeItem(key),
  start(checkRefresh: () => void) {
    const onActivity = () => { this.record(); checkRefresh() }
    const onVisible = () => { if (document.visibilityState === 'visible') checkRefresh() }
    const events = ['click', 'keydown', 'touchstart'] as const
    events.forEach((event) => window.addEventListener(event, onActivity, { passive: true }))
    window.addEventListener('popstate', onActivity)
    document.addEventListener('visibilitychange', onVisible)
    return () => {
      events.forEach((event) => window.removeEventListener(event, onActivity))
      window.removeEventListener('popstate', onActivity)
      document.removeEventListener('visibilitychange', onVisible)
    }
  },
}