import assert from "node:assert/strict";
import { existsSync, readFileSync } from "node:fs";
import { describe, it } from "node:test";

const appSource = readFileSync(new URL("../App.tsx", import.meta.url), "utf8");
const routesSourcePath = new URL("../routes/appRoutes.tsx", import.meta.url);
const readRoutesSource = () => {
  assert.equal(existsSync(routesSourcePath), true, "expected src/routes/appRoutes.tsx to exist");
  return readFileSync(routesSourcePath, "utf8");
};

describe("App route splitting", () => {
  it("loads route pages lazily instead of statically importing every page into the first bundle", () => {
    const routesSource = readRoutesSource();

    assert.doesNotMatch(appSource, /^import\s+\w+\s+from\s+["']\.\/pages\//m);
    assert.doesNotMatch(appSource, /lazy\(\s*\(\)\s*=>\s*import\(["']\.\/pages\//);
    assert.match(routesSource, /lazy\(\s*\(\)\s*=>\s*import\(["']\.\.\/pages\//);
  });

  it("wraps lazy routes in Suspense with an operator-friendly loading state", () => {
    assert.match(appSource, /Suspense/);
    assert.match(appSource, /Routes laden/);
  });

  it("keeps route definitions in a dedicated manifest instead of the app shell", () => {
    const routesSource = readRoutesSource();

    assert.match(appSource, /import\s+\{\s*appRoutes\s*\}\s+from\s+["']\.\/routes\/appRoutes["']/);
    assert.doesNotMatch(appSource, /<Route\s+path=/);
    assert.match(routesSource, /export\s+const\s+appRoutes/);
    assert.match(routesSource, /path:\s*["']\/ai\/security-reviewer["']/);
    assert.match(routesSource, /path:\s*["']\*["']/);
  });
});