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


namespace DefaultProject
{
    public class Test
    {
        public IList<Question> Questions { get; set; }
    }

    public class Question
    {
        public string Text { get; set; }
        public IList<Answer> Answers { get; set; }
    }

    public class Answer
    {
        public string Text { get; set; }
        public bool IsRight { get; set; }
    }


    public class Program {
        public static Test CreateTest()
        {
            return new Test
            {
                Questions = new List<Question>
                {
                    new Question
                    {
                        Text = "Какая команда выводит текст в консоль?",
                        Answers = new List<Answer>
                        {
                            new Answer { Text = "if/else" },
                            new Answer { Text = "System.out.println();" },
                            new Answer { Text = "Console.WriteLine();", IsRight = true },
                            new Answer { Text = "int x = 10;" }
                        }
                    },
                    new Question
                    {
                        Text = "Какой тип из списка целочисленный?",
                        Answers = new List<Answer>
                        {
                            new Answer { Text = "char" },
                            new Answer { Text = "int", IsRight = true },
                            new Answer { Text = "float" },
                            new Answer { Text = "double" }
                        }
                    }
                    //,...
                }
            };
        }

        public static void Main()
        {
            Console.WriteLine("Всем привет! И это моя первая мини-программа для проверки ваших знаний языка программирования C#");
            string input;

            do
            {
                Console.WriteLine("Если готовы пройти тест напишите Go, а если хотите выйти напишите Exit.");
                input = Console.ReadLine();

                if (input.Equals("Go", StringComparison.InvariantCultureIgnoreCase))
                {
                    var test = CreateTest();
                    PlayGame(test);
                }
            } while (   !input.Equals("Go", StringComparison.InvariantCultureIgnoreCase)
                     && !input.Equals("Exit", StringComparison.InvariantCultureIgnoreCase));

            Console.WriteLine("Для выхода нажмите любую клавишу...");
            Console.ReadKey();
        }

        private static void PlayGame(Test test)
        {
            var mistakes = new List<int>();
            for (int i = 0; i < test.Questions.Count; ++i)
            {
                var question = test.Questions[i];
                PrintQuestion(question, i);

                int choice = GetUserChoice(question.Answers.Count);

                if (!IsCorrectAnswer(choice, question.Answers))
                {
                    mistakes.Add(i + 1);
                }
            }

            CalculateResults(test.Questions.Count, mistakes);
        }

        private static void PrintQuestion(Question question, int questionIndex)
        {
            Console.WriteLine($"{questionIndex + 1}. {question.Text}");

            for (int i = 0; i < question.Answers.Count; ++i)
            {
                Console.WriteLine($"\t{i + 1}. {question.Answers[i].Text}");
            }
        }

        private static int GetUserChoice(int answersCount)
        {
            bool correctInput = false;
            int choice = -1;
            do
            {
                try
                {
                    Console.WriteLine("Введите номер ответа:");
                    string input = Console.ReadLine();
                    choice = Convert.ToInt32(input);
                    if (choice > 0 && choice <= answersCount) correctInput = true;
                }
                catch (Exception ex)
                {
                    Console.WriteLine("Неправильный формат ввода");
                }
            } while (!correctInput);

            return choice;
        }

        private static bool IsCorrectAnswer(int choice, IList<Answer> answers)
        {
            var rightAnswers = answers.Where(x => x.IsRight);
            int chosenAnswerIndex = choice - 1;
            return rightAnswers.Any(x => answers.IndexOf(x) == chosenAnswerIndex);
        }

        private static void CalculateResults(int questionsCount, IList<int> mistakes)
        {
            if (mistakes.Count == 0)
            {
                Console.WriteLine("Вы на все вопросы ответили правильно! Тест пройден на 100%! ");
            }
            else
            {
                string invalidQuestionsString = string.Join(", ", mistakes.Select(x => $"#{x}"));
                int progressPercentage = 100 - (int)Math.Ceiling(100 * (double)mistakes.Count / questionsCount);
                Console.WriteLine($"Среди ваших ответов есть неправильные ({mistakes.Count}: {invalidQuestionsString})). Тест пройден на {progressPercentage}% ");
            }
        }
    }
}