import { describe, expect, test } from "bun:test";
import { isValidLanguageTag } from "../../src/lib/languages.ts";

describe("isValidLanguageTag", () => {
	test("accepts well-formed BCP-47 tags", () => {
		for (const tag of ["en", "fr", "pt-BR", "zh-Hant", "de-DE", "eo"]) {
			expect(isValidLanguageTag(tag)).toBe(true);
		}
	});

	test("rejects HTML-bearing or malformed tags", () => {
		for (const tag of [
			'en" onmouseover=alert(1)',
			"en><script>",
			"en_US",
			"123",
			"-en",
			"en-",
			"",
		]) {
			expect(isValidLanguageTag(tag)).toBe(false);
		}
	});

	test("rejects an over-length tag even when otherwise well-formed", () => {
		const longTag = "aa-bbbbbbbb-cccccc"; // 18 chars, valid shape
		expect(longTag.length).toBeGreaterThan(16);
		expect(isValidLanguageTag(longTag)).toBe(false);
	});
});