import { useCallback, useMemo, useState } from 'react';
import type { ReceptionistAppointmentStatus } from '../ReceptionistHomePage/receptionistAppointmentStatus';

export type AppointmentStatusHold = {
    kind: 'unknown' | 'stale';
    requested: ReceptionistAppointmentStatus;
    basedOn: string;
};

/**
 * A status change nobody could confirm, or one refused because the appointment changed: nothing is chosen for
 * that appointment again until a fresh read settles it. Kept per appointment, so looking at another one in
 * between never lets go of it.
 */
export const useAppointmentStatusHolds = (selectedId: string | undefined) => {
    const [holds, setHolds] = useState<Record<string, AppointmentStatusHold>>({});
    const selectedHold = selectedId ? holds[selectedId] : undefined;
    const held = useMemo(
        () => (selectedId && selectedHold ? { id: selectedId, ...selectedHold } : undefined),
        [selectedHold, selectedId],
    );
    const hold = useCallback((id: string, value: AppointmentStatusHold) =>
        setHolds((current) => ({ ...current, [id]: value })), []);
    const release = useCallback((id: string) =>
        setHolds(({ [id]: _released, ...rest }) => rest), []);
    return { held, hold, release };
};