sendMessage method

Implementation

@override
Future<String> sendMessage({
  required String systemPrompt,
  required List<Map<String, String>> messages,
  int maxTokens = 8192,
}) async {
  dev.log(
    'Proxy request: provider=$providerName, mode=$mode, '
    'messages=${messages.length}, maxTokens=$maxTokens',
    name: 'ProxyAiDatasource',
  );

  try {
    final credential = await credentialProvider();
    if (credential == null || credential.isEmpty) {
      throw AiApiException(
        type: AiApiErrorType.auth,
        message: '${backendProvider.displayName} credential not configured.',
      );
    }

    final response = await _dio.post(
      functionUrl,
      options: Options(headers: headersBuilder()),
      data: {
        'provider': providerName,
        'credential': credential,
        'mode': mode,
        if (topicId != null) 'topicId': topicId,
        'messages': messages,
        'isValidation': isValidation,
        if (validationTarget != null) 'validationTarget': validationTarget,
        'isCardGeneration': isCardGeneration,
        'maxTokens': maxTokens,
        'stream': false,
      },
    );

    final data = response.data as Map<String, dynamic>;

    // Log any validation warnings.
    final validation = data['_validation'] as List<dynamic>?;
    if (validation != null && validation.isNotEmpty) {
      dev.log(
        'Output validation flags: $validation',
        name: 'ProxyAiDatasource',
      );
    }

    return data['text'] as String;
  } on DioException catch (e) {
    throw _mapError(e);
  }
}