import type { RumEvent, RumEventDomainContext } from '@datadog/browser-rum';

const SERVICE_REGEX =
    /unpkg\.servicetitan\.com\/@servicetitan\/(?<service>[\w-]+)(?:@(?<version>\d+\.\d+\.\d+(?:-[\w.]+)?))?/;

function parseService(event: RumEvent, input: string | undefined) {
    const match = input?.match(SERVICE_REGEX);

    const service = match?.groups?.service;
    const version = match?.groups?.version;

    if (service) {
        event.service = service;
        event.version = version ?? 'unknown';
        return true;
    }

    return false;
}

/**
 * See https://docs.datadoghq.com/real_user_monitoring/browser/advanced_configuration/?tab=npm#micro-frontend
 */
export function enrichEvent(event: RumEvent, context: RumEventDomainContext): void {
    const stack =
        (context && 'handlingStack' in context ? context.handlingStack : undefined) ??
        (event.type === 'error' ? event.error?.stack : undefined);

    const message = event.type === 'error' ? event.error?.message : undefined;

    const url = event.type === 'resource' ? event.resource?.url : undefined;

    for (const source of [stack, message, url]) {
        if (parseService(event, source)) {
            break;
        }
    }
}