RocketChat/Rocket.Chat

import type { IRole } from '@rocket.chat/core-typings';

type PriorityRoleName =
    | 'custom-role'
    | 'admin'
    | 'livechat-manager'
    | 'livechat-monitor'
    | 'livechat-agent'
    | 'user'
    | 'app'
    | 'bot'
    | 'guest'
    | 'anonymous';

const order = [
    'admin',
    'livechat-manager',
    'livechat-monitor',
    'livechat-agent',
    'custom-role',
    'user',
    'app',
    'bot',
    'guest',
    'anonymous',
] as const;

const rolesToConsiderAsUser = ['auditor', 'auditor-log'];

export function getMostImportantRole(roles: IRole['_id'][] = []): 'no-role' | PriorityRoleName {
    if (!roles.length) {
        return 'no-role';
    }

    roles = roles.map((r) => (rolesToConsiderAsUser.includes(r) ? 'user' : r));

    if (roles.length === 1) {
        if (!(order as readonly string[]).includes(roles[0])) {
            return 'custom-role';
        }
        return roles[0] as PriorityRoleName;
    }

    const newRoles: PriorityRoleName[] = [];
    for (const role of roles) {
        if ((order as readonly string[]).includes(role)) {
            newRoles.push(role as PriorityRoleName);
        } else if (!newRoles.includes('custom-role')) {
            newRoles.push('custom-role');
        }
    }

    for (const item of order) {
        if (newRoles.includes(item)) {
            return item;
        }
    }

    return 'no-role';
}