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

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

export function getComment(
	state: State,
	id?: Uuid
): Maybe< EditorialComment > {
	return id ? state.entities.comments[ id ] : undefined;
}

export const getCommentsRelatedToPost = createIndexedSelector(
	( state: State, postId?: PostId ): ReadonlyArray< EditorialComment > => {
		return getCommentIdsRelatedToPost( state, postId )
			.map( ( id ) => getComment( state, id ) )
			.filter( isDefined );
	},
	( state: State, postId?: PostId ) => ( {
		key: postId || 0,
		dependants: [ getCommentIdsRelatedToPost( state, postId ) ],
	} )
);

export const getCommentIdsRelatedToPost = createIndexedSelector(
	( state: State, postId?: PostId ): ReadonlyArray< Uuid > => {
		return Object.values( state.entities.comments )
			.filter( ( c ) => ! postId || c.postId === postId )
			.map( ( c ) => c.id );
	},
	( state: State, postId?: PostId ) => ( {
		key: postId || 0,
		dependants: [ state.entities.comments ],
	} )
);