/**
 * External dependencies
 */
import { values } from 'lodash';
import { createIndexedSelector } from '@nelio-content/utils';
import type { ExternalEvent, Maybe, Url, Uuid } from '@nelio-content/types';

/**
 * Internal dependencies
 */
import type { State } from '../../config';

export function getExternalEvent(
	state: State,
	id?: Uuid
): Maybe< ExternalEvent > {
	return id ? state.entities.externalEvents[ id ] : undefined;
}

export const getExternalEvents = createIndexedSelector(
	( state: State, calendarId?: Url ): ReadonlyArray< ExternalEvent > => {
		const events = values( state.entities.externalEvents );
		return events.filter( ( ev ) => ev.calendar === calendarId );
	},
	( state: State, calendarId?: Url ) => ( {
		key: calendarId || '',
		dependants: [ state.entities.externalEvents ],
	} )
);