#!/usr/bin/env node

// Cut a release: apply the pending changesets, commit, tag and push. Pushing
// the tag to knotless runs the release workflows under .knotless/workflows/,
// so this command is the whole human side of a release.
//
//   npm run release:cut
//
// Refuses to run on a dirty tree, off main, or with nothing to release.

import { execFileSync } from 'node:child_process';
import { readdirSync, readFileSync } from 'node:fs';
import { dirname, join, resolve } from 'node:path';
import { fileURLToPath } from 'node:url';

const repoRoot = resolve(dirname(fileURLToPath(import.meta.url)), '..');

/** @param {string} cmd @param {string[]} args */
function run(cmd, args) {
  return execFileSync(cmd, args, { cwd: repoRoot, encoding: 'utf8' }).trim();
}

/** @param {string} cmd @param {string[]} args */
function show(cmd, args) {
  console.log(`> ${cmd} ${args.join(' ')}`);
  execFileSync(cmd, args, { cwd: repoRoot, stdio: 'inherit' });
}

const branch = run('git', ['branch', '--show-current']);
if (branch !== 'main') {
  console.error(`On ${branch || 'a detached HEAD'}; releases cut from main.`);
  process.exit(1);
}
if (run('git', ['status', '--porcelain']) !== '') {
  console.error('The tree is dirty; commit or stash first.');
  process.exit(1);
}
show('git', ['pull', '--ff-only']);

const pending = readdirSync(join(repoRoot, '.changeset')).filter(
  (f) => f.endsWith('.md') && f !== 'README.md',
);
if (pending.length === 0) {
  console.error('No pending changesets; nothing to release.');
  process.exit(1);
}
console.log(`${pending.length} changeset(s) pending.`);

show('npm', ['run', 'version-packages']);

const { version } = JSON.parse(
  readFileSync(join(repoRoot, 'packages/core/package.json'), 'utf8'),
);
const tag = `v${version}`;
if (run('git', ['tag', '--list', tag]) !== '') {
  console.error(`${tag} already exists; the group version did not move.`);
  process.exit(1);
}

show('git', ['add', '-A']);
show('git', ['commit', '-m', `chore: version packages for ${version}`]);
show('git', ['tag', tag]);
show('git', ['push', 'knotless://chadtmiller.com/pds.js', 'main', tag]);

console.log(`\n${tag} pushed. The runner takes it from here:`);
console.log('  release-npm           -> npm packages');
console.log('  release-image         -> the PDS container image');
console.log('  release-runner-image  -> the check runner container image');
console.log(
  '  release-worker        -> the worker artifact on the artifacts site',
);