/**
 * Public-demo helpers.
 *
 * The demo build (VITE_DEMO=1) replays the intro/onboarding on each visit, but
 * only once per calendar day per browser — tracked in localStorage so it
 * survives the short-lived backend session. Also exposes the shared demo
 * credentials shown on the login screen.
 */

export const IS_DEMO =
  import.meta.env.VITE_DEMO === '1' || import.meta.env.VITE_DEMO === 'true'

/** Memorable shared password for the public demo (must match the mock backend). */
export const DEMO_PASSWORD = 'entertoexit'

const INTRO_DATE_KEY = 'demo_intro_date'

function todayKey(): string {
  // Local calendar day, e.g. "2026-06-22".
  const d = new Date()
  return `${d.getFullYear()}-${String(d.getMonth() + 1).padStart(2, '0')}-${String(d.getDate()).padStart(2, '0')}`
}

/** True if this browser already watched the intro earlier today. */
export function demoIntroSeenToday(): boolean {
  try {
    return localStorage.getItem(INTRO_DATE_KEY) === todayKey()
  } catch {
    return false
  }
}

/** Record that the intro has been seen today, so it won't replay until tomorrow. */
export function markDemoIntroSeen(): void {
  try {
    localStorage.setItem(INTRO_DATE_KEY, todayKey())
  } catch {
    /* ignore (private mode / storage disabled) */
  }
}

/** Forget today's "seen" marker so the intro plays again (e.g. "Replay Intro"). */
export function clearDemoIntroSeen(): void {
  try {
    localStorage.removeItem(INTRO_DATE_KEY)
  } catch {
    /* ignore */
  }
}