// A guest's name/contact, remembered locally so checkout doesn't ask again
// on their next order from this browser.
const STORAGE_KEY = 'ghost-kitchen-guest-identity'

export type GuestIdentity = { name: string; contact: string }

const isGuestIdentity = (value: unknown): value is GuestIdentity =>
  typeof value === 'object' &&
  value !== null &&
  typeof (value as GuestIdentity).name === 'string' &&
  typeof (value as GuestIdentity).contact === 'string'

export const getGuestIdentity = (): GuestIdentity | null => {
  try {
    const raw = window.localStorage.getItem(STORAGE_KEY)
    if (!raw) return null
    const parsed: unknown = JSON.parse(raw)
    return isGuestIdentity(parsed) ? parsed : null
  } catch {
    return null
  }
}

export const saveGuestIdentity = (identity: GuestIdentity) => {
  try {
    window.localStorage.setItem(STORAGE_KEY, JSON.stringify(identity))
  } catch {
    // Unavailable (private mode, quota) — checkout still works, it just
    // asks again next time.
  }
}

export const clearGuestIdentity = () => {
  try {
    window.localStorage.removeItem(STORAGE_KEY)
  } catch {
    // Unavailable — nothing to clear.
  }
}