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

namespace ICA13
{
    class Program
    {
        static void Main(string[] args)
        {
            do
            {
                int size = 0;      //input
                int[] array;

                //reset
                Console.Clear();

                //title
                Console.WriteLine("\t\t\tDale Chen-Song Assignment 13");

                //get value for size of array
                GetValue("Enter the size of the array: ", 4, 10, out size);

                //make arrays from user input
                array = MakeArray(size);

                //display the contents of the integer array
                Show(array);

                //display the contents of the integer array in reverse
                ShowReverse(array);

                //display the average of the integer array
                Console.WriteLine($"\nThe average is {Average(array)}");

                //display the largest value of the integer array

                //display message asking user if they want to do it again
                Console.Write("Run again? y/n: ");
                //if user inputs yes, loop
            } while (Console.ReadLine().ToLower() == "y");
        }
        //***********************************************************************************
        //Method: static private int GetValue(string prompt, int min, int max)
        //Purpose: get integer value from user with error and range checking
        //Parameters:   string prompt- prompt to display to the user
        //              int min- the minimum value of range for value
        //              int max- the maximum value of range for value
        //              out int input- input out the valid integer
        //***********************************************************************************
        static private void GetValue(string prompt, int min, int max, out int input)
        {
            bool success = false;   //success flag, true if success

            //repeat until input is right
            do
            {
                //user input value for integer
                Console.Write(prompt);
                success = int.TryParse(Console.ReadLine(), out input);

                //check if the value is valid
                if (!success)
                {
                    //display error message if invalid number, prompt user to try again
                    Console.WriteLine("An invalid number was entered, please try again.");
                }
                //check if the value is within the range
                else if (input < min || input > max)
                {
                    //display error message if out of range, prompt user to try again
                    Console.WriteLine("An out of range number was entered, please try again.");
                }
            }//continue looping until the input is correct
            while (!success || input < min || input > max);
        }

        static int[] MakeArray(int input)
        {
            Random generator = new Random();    //random number generator

            //create the array of integers to the specified size from user
            int[] integers = new int[input];

            //randomly generate numbers into the integer array
            for (int i = 0; i < integers.Length; ++i)
            {
                integers[i] = generator.Next(0, 100);
            }

            //return the integers to the main program
            return integers;
        }
        static private void Show(int[] array)
        {
            Console.WriteLine("\nThe array contents... ");
            //displays the contents of the integer array
            for (int i = 0; i < array.Length; ++i)
            {
                Console.WriteLine($"array[{i}] = {array[i]}");
            }

        }
        static private void ShowReverse(int[] array)
        {
            Console.WriteLine("\nThe array in reverse...");
            // displays the contents of the integer array
            for (int i = array.Length-1; i > 0; --i)
            {
                Console.WriteLine($"array[{i}] = {array[i]}");
            }
        }
        static private double Average(int[] array)
        {
            double average = 0;     //average of the values in the array
            int total = 0;          //sum of the values in the array

            //sum up the total value within the array
            foreach (int value in array)
            {
                total += value;
            }

            //calculating the average of the array
            average = (double)total / array.Length;

            //returns the average to the main console
            return average;
        }
        static private void Largest()
        {

        }
    }

}