// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0

import 'package:amplify_auth_cognito/amplify_auth_cognito.dart';
import 'package:amplify_flutter/amplify_flutter.dart';

const _hex = '[0-9a-f]';
const _uuidMatch = '$_hex{8}-$_hex{4}-$_hex{4}-$_hex{4}-$_hex{12}';
const _regionMatch = '[a-z]{2}-[a-z]{4,9}-[0-9]{1}';

// validates that the user sub exists and is a valid uuid
bool isValidUserSub(String? value) {
  if (value == null) {
    return false;
  }
  final uuidRegExp = RegExp('^$_uuidMatch\$');
  return uuidRegExp.hasMatch(value);
}

// validates that the identityId exists and matches the pattern region:uuid
bool isValidIdentityId(String? value) {
  if (value == null) {
    return false;
  }
  final identityIdRegExp = RegExp('^$_regionMatch:$_uuidMatch\$');
  return identityIdRegExp.hasMatch(value);
}

// validates that the keys/tokens exist and are non empty strings
bool isValidAWSCredentials(AWSCredentials? credentials) {
  return credentials is AWSCredentials &&
      credentials.accessKeyId.isNotEmpty &&
      credentials.secretAccessKey.isNotEmpty &&
      credentials.sessionToken != null &&
      credentials.sessionToken!.isNotEmpty;
}

// validates that the tokens exist and are non empty strings
bool isValidAWSCognitoUserPoolTokens(CognitoUserPoolTokens? tokens) {
  return tokens is CognitoUserPoolTokens &&
      tokens.accessToken.raw.isNotEmpty &&
      tokens.idToken.raw.isNotEmpty &&
      tokens.refreshToken.isNotEmpty;
}