/**
 * External dependencies
 */
import { createIndexedSelector } from '@nelio-content/utils';
import type {
	Maybe,
	Post,
	PostId,
	SocialMessage,
	EditorialComment,
	EditorialTask,
} from '@nelio-content/types';

/**
 * Internal dependencies
 */
import { getSocialMessagesRelatedToPost } from '../messages/selectors';
import { getCommentsRelatedToPost } from '../comments/selectors';
import { getTasksRelatedToPost } from '../tasks/selectors';
import { getAllPremiumItemsRelatedToPost } from '../premium/selectors';
import type { State } from '../../config';

type PostRelatedItems = {
	readonly comment: ReadonlyArray< EditorialComment >;
	readonly social: ReadonlyArray< SocialMessage >;
	readonly task: ReadonlyArray< EditorialTask >;
} & ReturnType< typeof getAllPremiumItemsRelatedToPost >;

export function getPost( state: State, id?: PostId ): Maybe< Post > {
	return id ? state.entities.posts[ id ] : undefined;
}

export const getPostRelatedItems = createIndexedSelector(
	( state: State, id?: PostId ): PostRelatedItems => {
		return {
			comment: getCommentsRelatedToPost( state, id ),
			social: getSocialMessagesRelatedToPost( state, id ),
			task: getTasksRelatedToPost( state, id ),
			...getAllPremiumItemsRelatedToPost( state, id ),
		};
	},
	( state: State, id?: PostId ) => ( {
		key: id || 0,
		dependants: [
			getCommentsRelatedToPost( state, id ),
			getSocialMessagesRelatedToPost( state, id ),
			getTasksRelatedToPost( state, id ),
			getAllPremiumItemsRelatedToPost( state, id ),
		],
	} )
);