// A staff payment whose outcome is unknown, kept per practice and invoice until the same key is confirmed or
// refused, so closing the dialog, the tab or the browser never turns one payment into two.
export interface PendingStaffPayment {
    key: string;
    cents: number;
}

const PREFIX = 'akashic.pendingStaffPayment.';
// Used only where local storage throws (a private window, blocked site data).
const fallback = new Map<string, PendingStaffPayment>();
const slot = (orgId: string, invoiceId: string) => `${PREFIX}${orgId}.${invoiceId}`;

export const readPendingStaffPayment = (orgId: string, invoiceId: string): PendingStaffPayment | null => {
    const name = slot(orgId, invoiceId);
    try {
        const raw = window.localStorage.getItem(name);
        if (!raw) return null;
        const value = JSON.parse(raw) as Partial<PendingStaffPayment>;
        return typeof value.key === 'string' && typeof value.cents === 'number'
            ? { key: value.key, cents: value.cents }
            : null;
    } catch {
        return fallback.get(name) ?? null;
    }
};

export const writePendingStaffPayment = (orgId: string, invoiceId: string, pending: PendingStaffPayment | null): void => {
    const name = slot(orgId, invoiceId);
    try {
        if (pending) window.localStorage.setItem(name, JSON.stringify(pending));
        else window.localStorage.removeItem(name);
    } catch {
        if (pending) fallback.set(name, pending);
        else fallback.delete(name);
    }
};