import "package:flutter_secure_storage/flutter_secure_storage.dart";

// small key/value seam so the token storage backend is swappable. the default
// is flutter_secure_storage which covers mobile + desktop properly and falls
// back to a best-effort impl on web. anyone embedding the SDK can hand us their
// own (e.g. an in-memory one for tests, or shared_prefs if they dont care).
abstract class TokenStore {
  Future<String?> read(String key);
  Future<void> write(String key, String value);
  Future<void> delete(String key);
}

class SecureTokenStore implements TokenStore {
  SecureTokenStore({FlutterSecureStorage? storage})
      : _storage = storage ?? const FlutterSecureStorage();

  final FlutterSecureStorage _storage;

  @override
  Future<String?> read(String key) => _storage.read(key: key);

  @override
  Future<void> write(String key, String value) =>
      _storage.write(key: key, value: value);

  @override
  Future<void> delete(String key) => _storage.delete(key: key);
}

// handy for tests, or platforms where you explicitly dont want persistence.
class MemoryTokenStore implements TokenStore {
  final Map<String, String> _m = {};

  @override
  Future<String?> read(String key) async => _m[key];

  @override
  Future<void> write(String key, String value) async => _m[key] = value;

  @override
  Future<void> delete(String key) async => _m.remove(key);
}