/*******************************************************************************************************************
  * Lab 1
  * Author: Jocelyn Smith
  * CIS 129 - Programming and Problem Solving I
  ******************************************************************************************************************/
import java.util.*;
public class CIS129_JocelynSmith_Lab1 {

  static Scanner keyboard = new Scanner(System.in);

  public static void main(String[] args) {

  //Declare variables and constants
    final int HIGH = 1000;
    final int LOW = 0;
    int offByAmount;

   //Display welcome message to user that explains what the program does
     displayWelcomeMessage();

   //Call functions to prompt and receive information from user
     String beekeeperName = getString ("What is your name O'Mighty Bee-Keeper?");
     int beeAmountGuess = getInteger (beekeeperName + " , how many Bees do you think are in the hive?");

   //Call function to receive random number of bees within parameters
     int numOfBees = getRandomNumber(LOW, HIGH);

   //Calculate difference between the guess and the actual amount of bees
      offByAmount = numOfBees - beeAmountGuess;

   //Call functions to display results and goodbye message to user
     System.out.println ("There are " + numOfBees + " Bees in the hive, " + beekeeperName + " .");
     System.out.println ("You were off by " + (Math.abs(offByAmount)) + " .");
     displayGoodbyeMessage();

      }//end Main


   //Create module to display Welcome message to user
   private static void displayWelcomeMessage() {
      System.out.println("**********************************************");
      System.out.println("            Guess the number of Bees!");
      System.out.println("");
      System.out.println("In this program, you will try to guess the number of Bees in a hive.");
      System.out.println("The program will then tell you how many Bees you were off by.");
      System.out.println("**********************************************");
      System.out.println("");

   }//end module

   //Create function to receive name from user
   private static String getString(String msg) {
      System.out.println(msg);
      String newValue = keyboard.nextLine(); //gets a the entire line as a String

      // Replaces all spaces with null and checks if entered value is null
      if (newValue.replaceAll(" ", "").equals("")) {
         System.err.println("Error: No input. Ending Program.");
         System.exit(-1);
      }
      return newValue;
   }//end function

   //Create function to receive the user's guess of amount of bees
   private static int getInteger(String msg) {
      System.out.println(msg);
      if (!keyboard.hasNextInt()) {  // gets input from the user and asks if it is an integer
         System.err.println("Error: Invalid number. Ending Program");
         System.exit(-1);
      }
      int newValue = keyboard.nextInt();  // gets an integer
      return newValue;
   }//end function

   //Create function to generate random number of bees between 0 and 1000
   public static int getRandomNumber (int low, int high) {
      return (int)(Math.random() * ((high + 1) - low)) + low;
   }//end function

   //

   //Create module to display goodbye message to user
   private static void displayGoodbyeMessage() {
      System.out.println("");
      System.out.println("Thank you for gracing us with your beekeeping presence!");
      System.out.println("Until we meet again!");
   }//end module

   private static void closeScanner() {
      if(keyboard != null) {
         keyboard.close() ;
      }
   }}//end class