RocketChat/Rocket.Chat

import type { IUser } from '@rocket.chat/core-typings';
import { Users } from '@rocket.chat/models';

import { settings } from '../../settings/server';

export const getUserNotificationPreference = async (user: IUser | string, pref: string) => {
    if (typeof user === 'string') {
        const u = await Users.findOneById(user);
        if (!u) {
            return null;
        }
        user = u;
    }

    let preferenceKey: 'desktopNotifications' | 'pushNotifications' | 'emailNotificationMode' | undefined;
    switch (pref) {
        case 'desktop':
            preferenceKey = 'desktopNotifications';
            break;
        case 'mobile':
            preferenceKey = 'pushNotifications';
            break;
        case 'email':
            preferenceKey = 'emailNotificationMode';
            break;
    }

    if (!preferenceKey) {
        return null;
    }

    if (
        user?.settings?.preferences &&
        typeof user.settings.preferences[preferenceKey] !== 'undefined' &&
        user.settings.preferences[preferenceKey] !== 'default'
    ) {
        return {
            value: user.settings.preferences[preferenceKey],
            origin: 'user',
        };
    }
    const serverValue = settings.get(`Accounts_Default_User_Preferences_${preferenceKey}`);
    if (serverValue) {
        return {
            value: serverValue,
            origin: 'server',
        };
    }

    return null;
};