/**
 * env.mjs — Load .env file if present
 * Reads key=value pairs from .env and sets process.env for any missing vars.
 * Never overwrites vars already set in the environment.
 */
import { existsSync, readFileSync } from 'fs';
import { resolve, dirname } from 'path';
import { fileURLToPath } from 'url';

const __dir = dirname(fileURLToPath(import.meta.url));
const envPath = resolve(__dir, '../.env');

export function loadEnv() {
  if (!existsSync(envPath)) return;
  const lines = readFileSync(envPath, 'utf8').split('\n');
  for (const line of lines) {
    const trimmed = line.trim();
    if (!trimmed || trimmed.startsWith('#')) continue;
    const eq = trimmed.indexOf('=');
    if (eq === -1) continue;
    const key = trimmed.slice(0, eq).trim();
    const val = trimmed.slice(eq + 1).trim().replace(/^["']|["']$/g, '');
    if (key && !(key in process.env)) {
      process.env[key] = val;
    }
  }
}