#!/usr/bin/env node

const { spawnSync } = require('child_process');
const fs = require('fs');
const path = require('path');

function loadDotEnv(filePath) {
  if (!fs.existsSync(filePath)) return;
  const lines = fs.readFileSync(filePath, 'utf8').split(/\r?\n/);
  for (const line of lines) {
    const trimmed = line.trim();
    if (!trimmed || trimmed.startsWith('#')) continue;
    const match = trimmed.match(/^([A-Za-z_][A-Za-z0-9_]*)=(.*)$/);
    if (!match) continue;
    const [, key, rawValue] = match;
    if (process.env[key] != null) continue;
    process.env[key] = rawValue.replace(/^["']|["']$/g, '');
  }
}

const projectRoot = path.resolve(__dirname, '..');
loadDotEnv(path.join(projectRoot, '.env'));

const mode = process.argv[2] || 'dev';
const engine = String(process.env.DEFAULT_GAME_ENGINE || process.env.GAME_ENGINE || 'ink')
  .trim()
  .toLowerCase();
const allowedModes = new Set(['dev', 'start']);
const allowedEngines = new Set(['ink', 'yaml', 'zcode']);

if (!allowedModes.has(mode)) {
  console.error(`Unsupported run mode "${mode}". Use "dev" or "start".`);
  process.exit(1);
}

if (!allowedEngines.has(engine)) {
  console.error(`Unsupported DEFAULT_GAME_ENGINE "${engine}". Use "ink", "yaml", or "zcode".`);
  process.exit(1);
}

const npmCommand = process.platform === 'win32' ? 'npm.cmd' : 'npm';
const script = `${mode}:${engine}`;
console.log(`[run-engine] DEFAULT_GAME_ENGINE=${engine}; running npm run ${script}`);

const result = spawnSync(npmCommand, ['run', script], {
  cwd: projectRoot,
  env: process.env,
  stdio: 'inherit',
});

process.exit(result.status == null ? 1 : result.status);