import type {
    RumEvent,
    RumEventDomainContext,
    RumInitConfiguration,
    RumResourceEventDomainContext,
} from '@datadog/browser-rum';
import { enrichEvent } from './enrich-event';
import { handleResource } from './handle-resource';

/**
 * Used for `application.beforeSend`. Returning `false` drops the event app-wide;
 * `void` / `true` passes it through.
 */
export type ApplicationBeforeSendHandler = (
    event: RumEvent,
    context: RumEventDomainContext
) => boolean | void;

/**
 * Used for per-service `beforeSend`. Transform-only: the return value is
 * ignored. Only `application.beforeSend` may drop events.
 */
export type ServiceBeforeSendHandler = (event: RumEvent, context: RumEventDomainContext) => void;

export function beforeSend(
    handler?: RumInitConfiguration['beforeSend']
): NonNullable<RumInitConfiguration['beforeSend']> {
    return function (event: RumEvent, context: RumEventDomainContext) {
        try {
            if (event.type === 'resource') {
                handleResource(event, context as RumResourceEventDomainContext);
            }

            enrichEvent(event, context);

            return handler?.(event, context) ?? true;
        } catch {} // eslint-disable-line no-empty

        return true;
    };
}