/**
 * Drift guard: `KNOWN_ELEMENTS` in `known.ts` must match the `customElement`
 * registrations under `src/components`. This is what would have caught
 * `:md-card` — matched by the completion scanner but registered nowhere.
 */

import { readdirSync, readFileSync } from "fs";
import { join } from "path";
import { ELEMENT_NAMES } from "./known.js";
import { renderReference } from "./reference.js";

const COMPONENTS_DIR = join(process.cwd(), "src", "components");
const CUSTOM_ELEMENT_RE = /customElement(?:<[^>]*>)?\(\s*["'](md-[\w-]+)["']/g;

function sourceFiles(dir: string): string[] {
  const files: string[] = [];
  for (const entry of readdirSync(dir, { withFileTypes: true })) {
    const full = join(dir, entry.name);
    if (entry.isDirectory()) files.push(...sourceFiles(full));
    else if (/\.tsx?$/.test(entry.name)) files.push(full);
  }
  return files;
}

function registeredElements(): Set<string> {
  const names = new Set<string>();
  for (const file of sourceFiles(COMPONENTS_DIR)) {
    const source = readFileSync(file, "utf-8");
    for (const match of source.matchAll(CUSTOM_ELEMENT_RE)) {
      names.add(match[1]);
    }
  }
  return names;
}

describe("known element catalog", () => {
  test("matches the customElement registrations under src/components", () => {
    const registered = [...registeredElements()].sort();
    const known = [...ELEMENT_NAMES].sort();

    expect(known).toEqual(registered);
  });

  test.each([
    ["docs/reference.md"],
    [join(".agents", "skills", "tttk-authoring", "reference.md")],
  ])("%s is up to date", (relativePath) => {
    const committed = readFileSync(join(process.cwd(), relativePath), "utf-8");

    expect(committed).toBe(renderReference());
  });
});