using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Question3
{
    class Program
    {
        static void Main(string[] args)
        {
            int choice = 1;
            List<TriviaQuestion> questions = new List<TriviaQuestion>();

            while (choice != 0)
            {

                Console.WriteLine("******************************");
                Console.WriteLine("* Trivia Game Administration *");
                Console.WriteLine("******************************");
                Console.WriteLine();
                Console.WriteLine("1. List Trivia Items");
                Console.WriteLine("2. Add Trivia Item");
                Console.WriteLine("3. Delete Trivia Item");
                Console.WriteLine("4. Quit");
                Console.WriteLine("Your choice: ");


                int.TryParse(Console.ReadLine(), out choice);


                if (choice == 1)
                {
                    if (questions.Count == 0)
                    {
                        Console.WriteLine("There are currently no items in the database.");
                        Console.WriteLine();
                    }
                    else
                    {
                        for (int i = 0; i < questions.Count; i++)
                        {
                            Console.WriteLine((i + 1) + ". " + questions.ElementAt(i).getQuestion());

                            string[] choices = questions.ElementAt(i).getChoices();
                            for (int j = 0; j < choices.Count(); j++)
                            {
                                Console.WriteLine("   " + (j + 1) + ". " + choices[j]);
                            }

                            Console.WriteLine("Current answer: " + questions.ElementAt(i).getAnswer());
                            Console.WriteLine();
                        }
                    }
                }
                else if (choice == 2)
                {
                    TriviaQuestion question = new TriviaQuestion();

                    Console.WriteLine("Enter the trivia item question: ");
                    String text = Console.ReadLine();
                    question.setQuestion(text);

                    Console.WriteLine("Enter answer #1: ");
                    String ans1 = Console.ReadLine();
                    question.addChoice(ans1, 1);

                    Console.WriteLine("Enter answer #2: ");
                    String ans2 = Console.ReadLine();
                    question.addChoice(ans2, 2);

                    Console.WriteLine("Enter answer #3: ");
                    String ans3 = Console.ReadLine();
                    question.addChoice(ans3, 3);

                    Console.WriteLine("Enter answer #4: ");
                    String ans4 = Console.ReadLine();
                    question.addChoice(ans4, 4);

                    Console.WriteLine("Enter the correct answer choice (1-4): ");
                    int ans;
                    int.TryParse(Console.ReadLine(), out ans);
                    question.setAnswer(ans);

                    questions.Add(question);
                }
                else if (choice == 3)
                {
                    Console.WriteLine("Item#    Question");
                    Console.WriteLine("-----    -------------------------------------------------------");
                    for (int i = 0; i < questions.Count; i++)
                    {
                        Console.WriteLine((i + 1) + "   " + questions.ElementAt(i).getQuestion());
                    }

                    Console.WriteLine("Enter the item number to delete: ");
                    int number;
                    int.TryParse(Console.ReadLine(), out number);

                    questions.RemoveAt(number - 1);
                    Console.WriteLine("Item #" + number + " has been deleted from the database.");
                }
                else if (choice == 4)
                {
                    choice = 0;

                    StringBuilder csv = new StringBuilder();
                    for (int i = 0; i < questions.Count; i++)
                    {
                        csv.AppendLine((i + 1) + ". " + questions.ElementAt(i).getQuestion());

                        string[] choices = questions.ElementAt(i).getChoices();
                        for (int j = 0; j < choices.Count(); j++)
                        {
                            csv.AppendLine("   " + (j + 1) + ". " + choices[j]);
                        }

                        csv.AppendLine("Current answer: " + questions.ElementAt(i).getAnswer());
                        csv.AppendLine();

                        File.WriteAllText("TrivialQuestions.csv", csv.ToString());
                    }

                    Console.WriteLine("The trivia items has been saved to the file TrivialQuestions.csv");
                    Console.WriteLine("Good-bye.");

                    // Keep the console window open in debug mode.
                    Console.WriteLine();
                    Console.WriteLine("Press any key to exit.");
                    Console.ReadKey();
                }
            }

        }
    }

    class TriviaQuestion
    {
        string Question;
        string[] Choices;
        int Answer;

        //constructor
        public TriviaQuestion()
        {
            Choices = new string[4];
        }

        //mutator methods
        public void setQuestion(string question)
        {
            this.Question = question;
        }

        public string getQuestion()
        {
            return Question;
        }

        public void addChoice(string choice, int choiceNumber)
        {
            this.Choices[choiceNumber - 1] = choice;
        }

        public string[] getChoices()
        {
            return Choices;
        }

        public void setAnswer(int answer)
        {
            this.Answer = answer;
        }

        public int getAnswer()
        {
            return Answer;
        }
    }
}