/*Part 1: Written Exercises (7 pts.)
 * 1
 * A. Valid
 * B. Invalid
 * C. Invalid
 * D. Valid
 * 2
 * A. 0
 * B. 7
 * C. 0
 * D. 8
 * E. 0
*/
import java.util.Scanner;
import java.text.*;
 public class Assignment7
 {
  public static void main(String[] args)
  {   //declare variables
      int number, size;
      String choice;
      char command;

      Scanner keyboard = new Scanner(System.in);
      // ask a user for a array size
      System.out.println("Please enter a size for the array.\n");
      size = keyboard.nextInt();

      // instantiate an IntCollection object
      Collection collection = new Collection(size);

      // print the menu
      printMenu();

      do
       {
           // ask a user to choose a command
           System.out.println("\nPlease enter a command or type ?");
           choice = keyboard.next().toLowerCase();
           command = choice.charAt(0);

           switch (command)
            {
                 case 'a': // add a number
                      System.out.println("\nPlease enter an integer to add.");
                      number = keyboard.nextInt();
                      if(collection.add(number))
                        System.out.println("\n" + number + " successfully added.");
                      else
                        System.out.println("\n"  + number + " is already in the array. " + number + " was not added.");
                      break;
                 case 'b': //remove from collection
                      System.out.println("Please enter an integer to remove.");
                      number = keyboard.nextInt();
                      if(collection.remove(number))
                            System.out.println("\n" + number + " successfully removed.");
                      else
                            System.out.println("\n"  + number + " is not in the array. " + number + " was not removed.");
                      break;
                 case 'c': //display
                      System.out.println(collection.toString());
                      break;
                 case 'd': //find largest
                       System.out.println("The largest number is: " + collection.findLargest());
                       break;

                 case 'e': // count of positive
                      System.out.println("\nThe count of positive numbers is: " + collection.countPositive());
                      break;
                  case 'f': // count of even numbers
                      // Round the output to three decimal places
                      DecimalFormat fmt = new DecimalFormat ("0.###");
                      System.out.println("\nThe average is: " + fmt.format(collection.computeAvg()));
                      break;

                 case '?':
                      printMenu();
                      break;
                 case 'q':
                      break;
                 default:
                      System.out.println("Invalid input!");
            }

        } while (command != 'q');

    }  //end of the main method


  // this method prints out the menu to a user
  public static void printMenu()
   {
    System.out.print("\nCommand Options\n"
                   + "-----------------------------------\n"
                   + "a: add an integer in the array\n"
                   + "b: remove an integer from the array\n"
                   + "c: display the array\n"
                   + "d: find largest\n"
                   + "e: count positive numbers\n"
                   + "f: compute average\n"
                   + "?: display the menu again\n"
                   + "q: quit this program\n\n");

    } // end of the printMenu method
 } // end of the Assignment7 class