/**
 * The Signup Mirror flow is gated by the ``signup_mirror`` flag, which
 * dashboard-api sets at registration for every new signup and exposes on
 * ``/me``. Accounts that registered before the flow shipped have it false, so
 * they keep the standard onboarding.
 */

/** The /me fields that decide where a mirror account resumes. */
export interface SignupMirrorUser {
  signup_mirror?: boolean;
  signup_mirror_completed_at?: string | null;
  launch_discount_status?: 'ELIGIBLE' | 'USED' | 'SKIPPED';
}

/**
 * Whether this account is in the Signup Mirror flow at all.
 *
 * @param {SignupMirrorUser | null} user - The /me flags for this account.
 * @return {boolean} True when the mirror flag is set.
 */
export const isSignupMirrorUser = (user?: SignupMirrorUser | null): boolean =>
  !!user?.signup_mirror;

/**
 * Whether the merchant still owes the Mirror (flag set, not yet completed).
 *
 * @param {SignupMirrorUser | null} user - The /me flags for this account.
 * @return {boolean} True when the Mirror is still pending.
 */
export const isSignupMirrorPending = (
  user?: SignupMirrorUser | null
): boolean => !!user?.signup_mirror && !user?.signup_mirror_completed_at;

export const isLaunchDiscountActioned = (
  user?: SignupMirrorUser | null
): boolean =>
  !!user?.launch_discount_status && user.launch_discount_status !== 'ELIGIBLE';

export const signupMirrorRedirect = (
  user?: SignupMirrorUser | null
): string | null => {
  if (!user?.signup_mirror) return null;
  if (user.signup_mirror_completed_at) return null;
  if (isLaunchDiscountActioned(user)) return '/onboarding-chain';

  return '/signup-mirror';
};