// The address somebody has just signed up with, carried to sign-in for one visit. Held in memory,
// not in the URL, so the address never lands in browser history.
let handedEmail: { email: string; verified: boolean } | undefined;

/** A patient who has just verified their address: sign-in says so. */
export const rememberVerifiedEmail = (email: string) => {
    handedEmail = { email, verified: true };
};

/** An address that only needs carrying, such as a just-created admin's: nothing was verified, so nothing says it was. */
export const rememberSignInEmail = (email: string) => {
    handedEmail = { email, verified: false };
};

/** Returns the handed address once, then forgets it, so a later visit to sign-in starts empty. */
export const takeSignInHandoff = (): { email: string; verified: boolean } => {
    const handed = handedEmail ?? { email: '', verified: false };
    handedEmail = undefined;
    return handed;
};

/** The address alone, for callers that only fill a field. */
export const takeVerifiedEmail = (): string => takeSignInHandoff().email;