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

let loaded = false;

function parseEnvLine(line) {
  const trimmed = String(line || '').trim();
  if (!trimmed || trimmed.startsWith('#')) {
    return null;
  }

  const separatorIndex = trimmed.indexOf('=');
  if (separatorIndex <= 0) {
    return null;
  }

  const key = trimmed.slice(0, separatorIndex).trim();
  let value = trimmed.slice(separatorIndex + 1).trim();

  if ((value.startsWith('"') && value.endsWith('"')) || (value.startsWith("'") && value.endsWith("'"))) {
    value = value.slice(1, -1);
  }

  return { key, value };
}

function loadLiveEnv() {
  if (loaded) {
    return;
  }

  loaded = true;

  const envPath = path.resolve(__dirname, '..', '..', '.env');
  if (!fs.existsSync(envPath)) {
    return;
  }

  const envText = fs.readFileSync(envPath, 'utf8');
  for (const line of envText.split(/\r?\n/)) {
    const entry = parseEnvLine(line);
    if (!entry || !entry.key || Object.prototype.hasOwnProperty.call(process.env, entry.key)) {
      continue;
    }

    process.env[entry.key] = entry.value;
  }
}

module.exports = {
  loadLiveEnv
};