[
    {
        "id": 0,
        "text": "7 x 5 = ?"
    },
    {
        "id": 1,
        "text": "12 x 13 = ?"
    },
    {
        "id": 3,
        "text": "2 ** 5 = ?"
    },
    {
        "id": 4,
        "text": "2 ** 10 = ?"
    },
    {
        "id": 5,
        "text": "2 ** 11 = ?"
    }
]

import 'dart:io';
import 'dart:convert';
import 'generated/umka.pb.dart';
final List<Question> questionsDb = _readDb();
List<Question> _readDb() {
  final jsonString = File('data/questions_db.json').readAsStringSync();
  final List db = jsonDecode(jsonString);
  return db
      .map((entry) => Question()
        ..id = entry['id']
        ..text = entry['text'])
      .toList();
}

@override
Future<Question> getQuestion(ServiceCall call, Student request) async {
  print('Received question request from: $request');
  return questionsDb[Random().nextInt(questionsDb.length)];
}
@override
Future<Evaluation> sendAnswer(ServiceCall call, Answer request) {
  // TODO: implement sendAnswer
  throw UnimplementedError();
}

class Server {
  Future<void> run() async {
    final server = grpc.Server([UmkaService()]);
    await server.serve(port: 5555);
    print('Serving on the port: ${server.port}');
  }
}
Future<void> main() async {
  await Server().run();
}

import 'package:grpc/grpc.dart';
import 'generated/umka.pbgrpc.dart';
class UmkaTerminalClient {
  late final ClientChannel channel;
  late final UmkaClient stub;
  UmkaTerminalClient() {
    channel = ClientChannel(
      '127.0.0.1',
      port: 5555,
      options: ChannelOptions(credentials: ChannelCredentials.insecure()),
    );
    stub = UmkaClient(channel);
  }
  Future<Question> getQuestion(Student student) async {
    final question = await stub.getQuestion(student);
    print('Received question: $question');
    return question;
  }
  Future<void> callService(Student student) async {
    await getQuestion(student);
    await channel.shutdown();
  }
}
Future<void> main(List<String> args) async {
  final clientApp = UmkaTerminalClient();
  final student = Student()
    ..id = 42
    ..name = 'Alice Bobich';
  await clientApp.callService(student);
}