const snackEnv = process.env.EXPO_PUBLIC_SNACK_ENV ?? 'production';

// Ensure the environment is valid
if (snackEnv === 'production' || snackEnv === 'staging') {
  console.log('Snack is running in', snackEnv, 'mode');
} else {
  throw new Error(
    `EXPO_PUBLIC_SNACK_ENV must be "staging" or "production", received "${snackEnv}".`,
  );
}

/**
 * The detected Snack environment based on the `EXPO_PUBLIC_SNACK_ENV` setting.
 * This defaults to `production` if not set.
 */
export const SNACK_ENV = snackEnv;

/** Get the value based on the detected Snack environment. */
export function selectValueBySnackEnv<T extends any>(values: Record<typeof SNACK_ENV, T>): T {
  return values[SNACK_ENV];
}

/** The Snack or Expo API endpoint. */
export const SNACK_API_URL = selectValueBySnackEnv({
  production: 'https://exp.host',
  staging: 'https://staging.exp.host',
});

/**
 * The Snackager Cloudfront endpoints to try before failing.
 * Note, staging may fail randomly due to reduced capacity or general development work.
 * Because of that, we try both staging and production before failing.
 */
export const SNACKAGER_API_URLS = selectValueBySnackEnv({
  production: ['https://d37p21p3n8r8ug.cloudfront.net'],
  staging: [
    'https://ductmb1crhe2d.cloudfront.net', // staging
    'https://d37p21p3n8r8ug.cloudfront.net', // production
  ],
});

/** The SnackPub endpoint, used to establish socket connections with the Snack Website. */
export const SNACKPUB_URL = selectValueBySnackEnv({
  production: 'https://snackpub.expo.dev',
  staging: 'https://staging-snackpub.expo.dev',
});