import { execFile, spawn } from 'node:child_process';
import { promisify } from 'node:util';

const run = promisify(execFile);

// Run a git command inside `cwd`. Returns trimmed stdout; throws with git's
// stderr on failure. `env` adds to (never replaces) the process environment.
export async function git(cwd, args, { env } = {}) {
  try {
    const { stdout } = await run('git', args, {
      cwd,
      env: env ? { ...process.env, ...env } : process.env,
    });
    return stdout.trim();
  } catch (err) {
    const detail = (err.stderr || err.message || '').trim();
    throw new Error(`git ${args.join(' ')} failed: ${detail}`);
  }
}

// Run a git command with inherited stdio so the user sees live progress and can
// answer prompts (e.g. an SSH key passphrase). Used for `git push`.
export function gitStream(cwd, args) {
  return new Promise((resolve, reject) => {
    const child = spawn('git', args, { cwd, stdio: 'inherit' });
    child.on('error', reject);
    child.on('close', (code) => {
      if (code === 0) resolve();
      else reject(new Error(`git ${args.join(' ')} exited with code ${code}`));
    });
  });
}

// A generic .gitignore suited to Node projects.
export const NODE_GITIGNORE = `# Dependencies
node_modules/
.pnp/
.pnp.js

# Logs
logs/
*.log
npm-debug.log*
yarn-debug.log*
yarn-error.log*
pnpm-debug.log*

# Build output
dist/
build/
out/
*.tsbuildinfo

# Coverage / test output
coverage/
.nyc_output/

# Caches
.cache/
.parcel-cache/
.eslintcache
.npm/

# Environment
.env
.env.*
!.env.example

# Editor / OS cruft
.DS_Store
Thumbs.db
.idea/
.vscode/
*.swp
`;