// EXPO_PUBLIC_* vars are inlined at bundle time by Expo's Babel plugin (or
// shipped via EAS Secrets for EAS builds — see apps/mobile/README.md).
// We pull them through a Proxy so missing vars throw on first READ, not at
// module-eval time. That keeps the throw inside the React tree where the
// <BootError> boundary can render it as a readable screen instead of a blank
// white window.

function required(name: string): string {
  const v = process.env[name];
  if (!v || v.length === 0) {
    throw new Error(
      'Missing required env var ' + name +
        '. Set it via `eas secret:create --scope project --name ' + name +
        ' --value ...` or in apps/mobile/.env.local for local dev (see .env.example).',
    );
  }
  return v;
}

interface EnvShape {
  supabaseUrl: string;
  supabaseAnonKey: string;
  authRedirectUrl: string;
}

function readEnv(): EnvShape {
  return {
    supabaseUrl: required('EXPO_PUBLIC_SUPABASE_URL'),
    supabaseAnonKey: required('EXPO_PUBLIC_SUPABASE_ANON_KEY'),
    authRedirectUrl: process.env.EXPO_PUBLIC_AUTH_REDIRECT_URL ?? 'netralax://auth/callback',
  };
}

let cached: EnvShape | null = null;

export const env: EnvShape = new Proxy({} as EnvShape, {
  get(_target, key: string | symbol): unknown {
    cached ??= readEnv();
    return cached[key as keyof EnvShape];
  },
});