"use strict";

const { LCS } = require("js-lcs");

module.exports = function selectBestPackage(query, packages) {
	if (packages.length === 0) {
		return null;
	} else if (packages.length === 1) {
		return packages[0];
	} else {
		/* We sort by (Longest Common Substring) similarity between the library and a candidate package, highest-scoring ones first; and then we refine the sort by assuming that the shortest package name is the most generic and therefore most-likely-correct one. */
		return packages
			.sort((a, b) => {
				let lcsOrder = LCS.size(b.attribute, query) - LCS.size(a.attribute, query);

				if (lcsOrder === 0) {
					return a.attribute.length - b.attribute.length;
				} else {
					return lcsOrder;
				}
			})
			[0];
	}
};