import { DisplayableFacet } from '@yext/search-core';
import { isLevenshteinMatch } from './utils/searchable-facets';

/**
 * Searches through the specified facet and filters out the options that aren't a
 * close match for the given searchTerm. The comparison is case insensitive.
 *
 * @param facet - The facet whose options are searched through
 * @param searchTerm - The search term to compare the facet options against
 * @returns The facet with only its options that are a close match for the
 *          searchTerm
 *
 * @public
 */
export function searchThroughFacet(facet: DisplayableFacet, searchTerm: string): DisplayableFacet {
  return {
    ...facet,
    options: facet.options.filter(o => isCloseMatch(o.displayName, searchTerm))
  };
}

/**
 * Checks if the searchTerm is a case-insensitive, Levenshtein match for the value.
 *
 * @param value - The string to compare against
 * @param searchTerm - The term being searched for
 * @returns Whether or not the searchTerm is a substring of or a close Levenshtein match
 *          for the value
 *
 * @public
 */
export function isCloseMatch(value: string, searchTerm: string): boolean {
  return isLevenshteinMatch(value.toLowerCase(), searchTerm.toLowerCase());
}