#include <fstream>
#include <iostream>
#include <sstream>
#include <string>
#include <vector>

class Question
{
public:

    Question(std::string const& title, std::string const& description)
        : title{title}, description{description}
    { }

    virtual ~Question() = default;
    
    virtual void print(std::ostream& os) const
    {
        os << title << "\n\n" << description << "\n" << std::endl;
    }
    
    virtual bool handle(std::ostream& os, std::istream& is) = 0;
    
private:

    std::string title;
    std::string description;
    
};

class Multi_Question : public Question
{
public:
    
    Multi_Question(std::string const& title, std::string const& description,
                   std::vector<std::string> const& alternatives,
                   int answer)
        : Question{title, description}, alternatives{alternatives}, answer{answer}
    { }

    void print(std::ostream& os) const override
    {
        os << "Multi question: ";
        Question::print(os);
    }
 
    bool handle(std::ostream& os, std::istream& is) override
    {
        os << "Select all correct alternatives:\n";
        for (unsigned i { 0 }; i < alternatives.size(); ++i)
        {
            os << (i + 1) << ". " << alternatives[i] << std::endl;
        }
        os << "\nEnter alternative: ";

        int user_answer{};
        is >> user_answer;
        is.ignore(1000, '\n');

        return user_answer == answer;
    }
    
private:

    std::vector<std::string> alternatives;
    int answer;
    
};

class Textual_Question : public Question
{
public:

    Textual_Question(std::string const& title, std::string const& description,
                     std::string const& answer)
        : Question{title, description}, answer{answer}
    { }

    void print(std::ostream& os) const override
    {
        os << "Textual question: ";
        Question::print(os);
    }
    
    bool handle(std::ostream& os, std::istream& is) override
    {
        os << "Enter your answer: ";

        std::string user_answer;
        std::getline(is, user_answer);

        return user_answer == answer;
    }

private:

    std::string answer;
    
};

int main()
{
    std::vector<Question*> questions {

        new Multi_Question   { "Question 1", "Which of these datatypes represents a number?",
                               { "int", "char", "string", "bool" },
                               1},
        
        new Textual_Question { "Question 2", "What is the course code for this course?", "TDP004" }

    };

    for (Question* question : questions)
    {
        question->print(std::cout);
        bool correct { question->handle(std::cout, std::cin) };

        std::cout << "Your answer was: ";
        if (correct)
            std::cout << "Correct!\n" << std::endl;
        else
            std::cout << "Wrong...\n" << std::endl;
        
        delete question;
    }
}