/**
 * Run Django management commands from this backend folder.
 * Usage:
 *   node dev.mjs              # runserver 0.0.0.0:8001
 *   node dev.mjs migrate
 *   node dev.mjs seed_demo
 */
import { spawn } from 'node:child_process';
import { existsSync } from 'node:fs';
import path from 'node:path';
import { fileURLToPath } from 'node:url';

const djangoRoot = path.dirname(fileURLToPath(import.meta.url));

if (!existsSync(path.join(djangoRoot, 'manage.py'))) {
  console.error('[backend] manage.py not found.');
  process.exit(1);
}

const extra = process.argv.slice(2);
const manageArgs =
  extra.length === 0
    ? ['manage.py', 'runserver', '0.0.0.0:8001']
    : ['manage.py', ...extra];

function resolvePython() {
  const isWin = process.platform === 'win32';
  const venvPython = isWin
    ? path.join(djangoRoot, '.venv', 'Scripts', 'python.exe')
    : path.join(djangoRoot, '.venv', 'bin', 'python');

  if (existsSync(venvPython)) {
    return venvPython;
  }

  return isWin ? 'python' : 'python3';
}

const python = resolvePython();
const child = spawn(python, manageArgs, {
  cwd: djangoRoot,
  stdio: 'inherit',
  env: process.env,
});

child.on('error', (err) => {
  console.error(`[backend] Failed to start ${python}:`, err.message);
  process.exit(1);
});

child.on('exit', (code, signal) => {
  if (signal) {
    process.exit(1);
  }
  process.exit(code ?? 0);
});