import { isProblem, type Problem } from '../../shared/links/problem';
import type { RouteParams } from '../../shared/lib/route';

export const ALL_FILTER = 'all';
const FIRST_PAGE = 1;

export type LinksFilter = Problem | typeof ALL_FILTER;

export function linksFilterOf( params: RouteParams ): LinksFilter {
	if ( isProblem( params.status ) ) {
		return params.status;
	}

	return ALL_FILTER;
}

export function linksPageOf( params: RouteParams ): number {
	const page = Number( params.page );

	if ( Number.isNaN( page ) || page === 0 ) {
		return FIRST_PAGE;
	}

	return Math.max( FIRST_PAGE, page );
}