import { test, describe, after } from 'node:test';
import assert from 'node:assert/strict';
import { existsSync } from 'node:fs';
import { join, dirname } from 'node:path';
import { execFileSync } from 'node:child_process';
import { fileURLToPath } from 'node:url';

import { tempRepo, cleanup, TEST_ENV } from './helpers.mjs';

after(cleanup);

const ROOT = join(dirname(fileURLToPath(import.meta.url)), '..');
const ONBOARD = join(ROOT, 'scripts', 'onboard.mjs');

/** Run the onboarding script directly. Never throws — returns {code, stdout, stderr}. */
function onboard(args) {
  try {
    const stdout = execFileSync(process.execPath, [ONBOARD, ...args], {
      encoding: 'utf8',
      stdio: ['ignore', 'pipe', 'pipe'],
      env: TEST_ENV,
    });
    return { code: 0, stdout, stderr: '' };
  } catch (e) {
    return { code: e.status ?? 1, stdout: e.stdout ?? '', stderr: e.stderr ?? '' };
  }
}

describe('onboard script', () => {
  test('--dry-run writes nothing', () => {
    const dir = tempRepo();
    const r = onboard([dir, '--dry-run']);
    assert.equal(r.code, 0);
    assert.ok(!existsSync(join(dir, '.github', 'agents')), 'dry run must not create files');
    assert.ok(!existsSync(join(dir, '.agents')), 'dry run must not run lh init');
    assert.match(r.stdout, /would write/);
  });

  test('--yes --no-npm-link copies the behaviour layer and runs lh init + doctor', () => {
    const dir = tempRepo({
      'package.json': JSON.stringify({ name: 'fixture', version: '1.0.0', scripts: { test: 'true' } }, null, 2),
    });
    const r = onboard([dir, '--yes', '--no-npm-link']);
    assert.equal(r.code, 0, r.stdout + r.stderr);
    for (const rel of ['.github/agents/conductor.agent.md', '.github/skills/design/SKILL.md',
      '.github/mcp.json', 'AGENTS.md', '.agents/harness.config.json']) {
      assert.ok(existsSync(join(dir, rel)), `expected ${rel} to exist`);
    }
    assert.match(r.stdout, /doctor: all required checks passed/);
  });

  test('rerunning with --yes is idempotent (no forced overwrite, no init failure)', () => {
    const dir = tempRepo({
      'package.json': JSON.stringify({ name: 'fixture', version: '1.0.0', scripts: { test: 'true' } }, null, 2),
    });
    assert.equal(onboard([dir, '--yes', '--no-npm-link']).code, 0);
    const second = onboard([dir, '--yes', '--no-npm-link']);
    assert.equal(second.code, 0, second.stdout + second.stderr);
    assert.match(second.stdout, /already up to date/);
    assert.match(second.stdout, /already initialized/);
  });

  test('refuses a target directory that does not exist', () => {
    const r = onboard(['/nonexistent/path/for/sure', '--yes']);
    assert.notEqual(r.code, 0);
  });

  test('a conflicting existing file is skipped unless --force', () => {
    const dir = tempRepo({ 'AGENTS.md': 'custom project notes, do not clobber\n' });
    const r = onboard([dir, '--yes', '--no-npm-link']);
    assert.equal(r.code, 0);
    assert.match(r.stdout, /skipped/);
    const kept = existsSync(join(dir, 'AGENTS.md'));
    assert.ok(kept, 'AGENTS.md must still exist');

    const forced = onboard([dir, '--yes', '--no-npm-link', '--force']);
    assert.equal(forced.code, 0);
    assert.match(forced.stdout, /written/);
  });
});