#!/usr/bin/env node

import { mkdtemp, mkdir, rm, writeFile } from 'node:fs/promises';
import os from 'node:os';
import path from 'node:path';
import { spawnSync } from 'node:child_process';

import { verifyHistory } from './gate-history.mjs';

const root = await mkdtemp(path.join(os.tmpdir(), 'gate-delayed-introduction-'));
function git(...args) {
  const result = spawnSync(
    'git',
    ['-c', 'user.name=gate-control', '-c', 'user.email=gate-control@example.invalid', ...args],
    { cwd: root, encoding: 'utf8' },
  );
  if (result.status !== 0) throw new Error(result.stderr || result.stdout);
  return result.stdout.trim();
}

try {
  git('init', '-q');
  await writeFile(path.join(root, 'baseline.txt'), 'baseline\n');
  git('add', '.');
  git('commit', '-m', 'provider target baseline');
  const baseline = git('rev-parse', 'HEAD');
  git('update-ref', 'refs/remotes/origin/main', baseline);
  await mkdir(path.join(root, 'scripts'), { recursive: true });
  await writeFile(path.join(root, 'scripts', 'preflight.mjs'), 'process.exit(0);\n');
  git('add', '.');
  git('commit', '-m', 'gate change before registry');
  const unregisteredCommit = git('rev-parse', 'HEAD');
  await mkdir(path.join(root, 'gates'), { recursive: true });
  await writeFile(path.join(root, 'gates', 'gates.manifest.json'), '{"schemaVersion":1}\n');
  git('add', '.');
  git('commit', '-m', 'delayed registry introduction');

  const previousBranch = process.env.CI_COMMIT_BRANCH;
  process.env.CI_COMMIT_BRANCH = 'feature/delayed-introduction-control';
  let result;
  try {
    result = await verifyHistory({ root, manifest: { schemaVersion: 1 } });
  } finally {
    if (previousBranch === undefined) delete process.env.CI_COMMIT_BRANCH;
    else process.env.CI_COMMIT_BRANCH = previousBranch;
  }
  const detail = result.failures.join('\n');
  if (detail.includes(unregisteredCommit) && /own-tree registry cannot be read/i.test(detail)) {
    process.stderr.write(`delayed registry introduction rejected: ${detail}\n`);
    process.exitCode = 1;
  } else {
    process.stdout.write('delayed registry introduction was not rejected\n');
  }
} finally {
  await rm(root, { recursive: true, force: true });
}