namespace ABCD.UI.Model
{
public class Quiz
{
    public User ActiveUser { get; private set; }
    public User InActiveUser { get; private set; }

    public int NumberOfQuestions { get; }
    public int CurrentQuestion { get; private set; }

    public int QuestionsPerStage => NumberOfQuestions / 2;

    public Quiz(int numberOfQuestions, User activeUser, User inActiveUser)
    {
        NumberOfQuestions = numberOfQuestions;
        ActiveUser = activeUser;
        InActiveUser = inActiveUser;
    }

    public int MatchingResults(User activeUser, User inActiveUser)
    {
        int activeUserCount = activeUser.OwnAnswers.Count(n => inActiveUser.ColleagueAnswers.Select(n1 => n1.Option).Contains(n.Option));
        int inActiveUserCount = inActiveUser.OwnAnswers.Count(n => activeUser.ColleagueAnswers.Select(n1 => n1.Option).Contains(n.Option));
        return activeUserCount + inActiveUserCount;
    }

    public void SwapUsers()
    {
        var temp = ActiveUser;
        ActiveUser = InActiveUser;
        InActiveUser = temp;
    }

    public void NextQuestion()
    {
        CurrentQuestion++;
    }
}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using ABCD.UI.DataLayer;
using ABCD.UI.Model;
using Newtonsoft.Json;

namespace ABCD.UI
{
    [Activity(Label = "ABCDMenu")]
    public class QuizQuestion : Activity
    {
        private int _currentQuestionAnswer;

        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            SetContentView(Resource.Layout.quizQuestion);

            // Retrieve next Question ID, or default to 1
            Quiz myQuiz = JsonConvert.DeserializeObject<Quiz>(Intent.GetStringExtra("myQuiz"));

            User activeUser = myQuiz.ActiveUser;
            User inActiveUser = myQuiz.InActiveUser;

            // Assign views from layout
            Button nextQuestionButton = FindViewById<Button>(Resource.Id.nextQuestionButton);
            TextView questionTextView = FindViewById<TextView>(Resource.Id.questionTextView);
            TextView currentUserTextView = FindViewById<TextView>(Resource.Id.currentUserTextView);
            ListView questionListView = FindViewById<ListView>(Resource.Id.questionListView);

            // If final question
            if (myQuiz.EndOfSecondPhase())
            {
                nextQuestionButton.Text = "Results";
            }

            myQuiz.NextQuestion();
            currentUserTextView.Text = $"Asking {activeUser}";

            IAbcdRepository repository = new SqLiteAbcdRepository();
            Question question = repository.GetQuestionById(myQuiz.CurrentQuestion);

            // Assign the question to the text view
            questionTextView.Text = question.ToString();

            // Assign each question option to the list view
            List<String> options = question.GetOptions();
            questionListView.Adapter = new ArrayAdapter(this, Android.Resource.Layout.SimpleListItemSingleChoice, options);
            questionListView.ChoiceMode = ChoiceMode.Single;

            // Click event to move to next activity
            nextQuestionButton.Click += (sender, e) =>
            {

                Intent mainIntent;
                mainIntent = new Intent(this, typeof(QuizQuestion));

                mainIntent.PutExtra("myQuiz", JsonConvert.SerializeObject(myQuiz));
                StartActivity(mainIntent);
            };

            // Enable next question button once item is selected
            questionListView.ItemClick += (sender, e) =>
            {
                _currentQuestionAnswer = e.Position;
                nextQuestionButton.Enabled = true;
            };
        }

    }
}