import assert from "node:assert/strict";
import { existsSync } from "node:fs";
import { fileURLToPath } from "node:url";
import { test } from "node:test";
import { build } from "esbuild";

const out = await build({ entryPoints: [fileURLToPath(new URL("../src/ui/language-catalog.ts", import.meta.url))],
  bundle: true, write: false, format: "esm", platform: "node", logLevel: "silent" });
const { languageCatalog, searchLanguages, describeLanguage, BCP47 } =
  await import(`data:text/javascript;base64,${Buffer.from(out.outputFiles[0].text).toString("base64")}`);
const all = languageCatalog();
const codes = (text) => searchLanguages(all, text).map((o) => o.code);

test("a language is found by its Russian name, its own name, English name or code", () => {
  assert.equal(codes("немец")[0], "de");
  assert.equal(codes("deutsch")[0], "de");
  assert.equal(codes("german")[0], "de");
  assert.equal(codes("ja")[0], "ja");
  assert.ok(codes("португал").includes("pt-BR"));
});

test("names that begin with the text come before names that merely contain it", () => {
  const found = codes("но");  // «Норвежский» starts with it; «Македонский» or «Иврит»-like names only contain it
  assert.equal(found[0], "no");
  assert.ok(found.length > 1, "words that only contain the text are still offered");
});

test("empty search shows everything, nonsense shows nothing", () => {
  assert.equal(searchLanguages(all, "  ").length, all.length);
  assert.deepEqual(codes("qqqqzzz"), []);
});

test("every flag the catalog points to exists, and every offered code is valid BCP-47", () => {
  for (const o of all) {
    assert.match(o.code, BCP47, o.code);
    if (o.flag) assert.ok(existsSync(fileURLToPath(new URL(`../public/flags/${o.flag}.svg`, import.meta.url))), `${o.code} -> ${o.flag}`);
  }
  assert.equal(describeLanguage("ru").name, "Русский");
});