app.config.js

const dotenv = require('dotenv');
const pkg = require('./package.json');

dotenv.config({ quiet: true });

/** Only string/number secrets belong in extra; objects become "[object Object]" in embedded HTML. */
function extraStringOrNull(v) {
  if (v == null || v === '') return null;
  if (typeof v === 'string') {
    const t = v.trim();
    return t.length ? t : null;
  }
  if (typeof v === 'number' && Number.isFinite(v)) return String(v);
  return null;
}

module.exports = ({ config }) => {
  /** GitHub Pages project sites are served under /<repo>/; set in CI (see deploy-pages workflow). */
  const basePath = (process.env.EXPO_PUBLIC_BASE_PATH || '').trim().replace(/\/+$/, '');

  return {
    ...config,
    version: pkg.version,
    experiments: {
      ...(config.experiments || {}),
      ...(basePath ? { baseUrl: basePath } : {}),
    },
    plugins: [
      ...(config.plugins || []),
      'expo-secure-store',
      'expo-web-browser'
    ],
    extra: {
      // Preserve any existing extra values
      ...(config.extra || {}),
      MAPBOX_ACCESS_TOKEN: extraStringOrNull(process.env.MAPBOX_ACCESS_TOKEN),
      METEOBLUE_API_KEY:
        extraStringOrNull(process.env.METEOBLUE_API_KEY) ??
        extraStringOrNull(process.env.EXPO_PUBLIC_METEOBLUE_API_KEY),
    },
  };
};