import { describe, expect, test } from "bun:test";
import { dirname, resolve } from "node:path";
import { fileURLToPath } from "node:url";

// Guards the one rule that broke the preview: an asset URL starting with "/" escapes the proxy prefix.
//
// Served through a path-prefix proxy the app lives under /<prefix>/, and only the HTML is
// rewritten — a root-absolute path inside a component reaches the platform root, which answers
// 200 text/html. The image is broken and the network tab shows no error, so this is worth a test
// rather than a note someone reads after losing an afternoon to it.

const frontendDir = dirname(fileURLToPath(import.meta.url));
const templatePath = resolve(frontendDir, "index.html");

describe("asset URLs", () => {
  test("index.html declares a base so relative URLs can be rewritten", async () => {
    const html = await Bun.file(templatePath).text();
    expect(html).toMatch(/<base\s+href="\/"\s*\/?>/);
  });

  test("no component uses a root-absolute asset URL", async () => {
    const offenders: string[] = [];

    for await (const relative of new Bun.Glob("**/*.tsx").scan({ cwd: frontendDir })) {
      const source = await Bun.file(resolve(frontendDir, relative)).text();

      for (const [match] of source.matchAll(/\b(?:src|srcSet|poster)=["']\/[^/][^"']*["']/g)) {
        offenders.push(`${relative}: ${match}`);
      }
    }

    expect(offenders).toEqual([]);
  });
});