// A notification email links to `#/go/<token>`. The token is held for this tab across sign-in and
// opened once the person is signed in; it grants nothing and names nobody on its own.

const SESSION_KEY = 'akashere_notification_link_token';
const GO_PATH = /^#\/go\/([0-9a-f]{64})(?:[/?].*)?$/;

export type NotificationDestination =
    | { kind: 'appointment'; id: string }
    | { kind: 'task'; id: string }
    | { kind: 'message'; id: string }
    | { kind: 'record' }
    | { kind: 'home' };

export const extractNotificationLinkToken = (hash: string): string | null =>
    GO_PATH.exec(hash ?? '')?.[1] ?? null;

export const getNotificationLinkToken = (): string | null => {
    try {
        return window.sessionStorage.getItem(SESSION_KEY);
    } catch {
        return null;
    }
};

export const clearNotificationLinkToken = (): void => {
    try {
        window.sessionStorage.removeItem(SESSION_KEY);
    } catch {
        // ignore
    }
};

/**
 * Hold a `#/go/<token>` link for this tab and take it out of the address bar, so it is not left in
 * history or on a shared screen. sessionStorage, so it dies with the tab.
 */
export const captureNotificationLink = (
    hash: string = window.location.hash,
    replaceHash: (hash: string) => void = (next) => window.history.replaceState(null, '', next),
): boolean => {
    const token = extractNotificationLinkToken(hash);
    if (!token) return false;
    try {
        window.sessionStorage.setItem(SESSION_KEY, token);
    } catch {
        // Without storage the link cannot survive sign-in; the portal still opens.
    }
    try {
        replaceHash('#/');
    } catch {
        // ignore
    }
    return true;
};

/** The route state a destination opens with: a record update opens on the practice it came from. */
export const destinationState = (destination: NotificationDestination, organization?: { id: string }) =>
    destination.kind === 'record' && organization?.id ? { recordPractice: organization.id } : undefined;

/** The portal route a destination opens. */
export const destinationPath = (destination: NotificationDestination): string => {
    switch (destination.kind) {
        case 'appointment':
            return '/dashboard/my-appointments';
        case 'task':
            return `/dashboard/home/task/${encodeURIComponent(destination.id)}`;
        case 'message':
            return '/dashboard/messages';
        case 'record':
            return '/dashboard/patient';
        default:
            return '/dashboard/home';
    }
};