const fs = require('fs');
const path = require('path');

function fileExists(filePath) {
  try {
    return fs.statSync(filePath).isFile();
  } catch (_error) {
    return false;
  }
}

function getDefaultConfigCandidates(options = {}) {
  const packaged = options.packaged !== undefined ? options.packaged : Boolean(process.pkg);
  const cwd = options.cwd || process.cwd();
  const appDir = options.appDir || __dirname;
  const execPath = options.execPath || process.execPath;

  if (packaged) {
    const execDir = path.dirname(execPath);
    return [
      path.join(execDir, 'runtime', 'config.json'),
      path.join(execDir, 'config.json'),
      path.join(cwd, 'config.json'),
    ];
  }

  return [
    path.join(cwd, 'config.json'),
    path.join(appDir, 'config.json'),
  ];
}

function getDefaultConfigPath(options = {}) {
  const candidates = getDefaultConfigCandidates(options);
  return candidates.find(fileExists) || candidates[0];
}

module.exports = {
  fileExists,
  getDefaultConfigCandidates,
  getDefaultConfigPath,
};