// @vitest-environment node
import { describe, it, expect } from 'vitest';
import { readdirSync, readFileSync, statSync } from 'node:fs';
import { fileURLToPath } from 'node:url';
import { join } from 'node:path';

// This package is ESM ("type": "module") — __dirname does not exist here.
const SRC = fileURLToPath(new URL('.', import.meta.url));
const ADAPTERS = join(SRC, 'adapters');

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

// The whole premise of this package: core renders, adapters transport. If core ever
// imports a transport, an app on a different backend pays for socket code it cannot
// use — which is exactly how iios-message-web welded itself to MessageSocket.
describe('transport boundary', () => {
  const coreFiles = tsFilesIn(SRC).filter((f) => !f.startsWith(ADAPTERS) && !/\.test\.tsx?$/.test(f));

  it('has core files to check', () => {
    expect(coreFiles.length).toBeGreaterThan(0);
  });

  it('core never imports a transport package', () => {
    const offenders: string[] = [];
    for (const file of coreFiles) {
      const content = readFileSync(file, 'utf8');
      if (/@insignia\/iios-kernel-client|socket\.io|@abe-kap\/appshell-sdk/.test(content)) {
        offenders.push(file.replace(SRC, 'src'));
      }
    }
    expect(offenders).toEqual([]);
  });
});