import java.util.Scanner;

/**
 * Voting class:
 * Ask the user for their first, last name, their year of birth, and if needed their birth month.
 * Determines their voting eligibility, and produces a relevant message.
 * Citizens who have turned 18 in November of this year are considered eligible for voting.
 *
 * Goals:
 * practice with the Scanner class, Strings, boolean expressions, conditionals
 *
 * @author Stella K.
 * @version Aug 13, 2019
 * 
 * These is a set of good and comprehensive test cases:
 * birth year: 2000 - clearly eligible for voting, no birth month is needed
 * birth year: 2020 - clearly non-eligible for Voting, no birth month is needed
 * birth year: 2005 - age is exactly 18, so we also need the month: birth month: 11 (Nov) ==> eligible
 * birth year: 2005 - age is exactly 18, so we also need the month: birth month: 10 (Oct) ==> non-eligible
 *
 */

public class Voting
{
    public static void main(String[] args) {
        //declaration and initializations of vars
        Scanner scan = new Scanner(System.in);

        int currentYear = 2023;
        int birthYear;
        int age;
        int birthMonth = 10;

        //ask user for their first and last name (doing some extras here)
        System.out.println("What is your first name?");
        String firstName = scan.nextLine();
        System.out.println("What is your last name?");
        String lastName = scan.nextLine();

        //ask user for their birth year
        System.out.println("What is your birth year (2000)?");
        birthYear = scan.nextInt(); //use 2000 2020 2005
        scan.nextLine(); //flush the scanner

        //determine user's age
        age = currentYear - birthYear; 
        //alternatively use the following expression to avoid hardwiring of the current year
        //java.time.Year.now().getValue() //instead of 2023

        //ask user for their birth month, but only if their age is 18
        if (age == 18) {
            System.out.println("What is your birth month (1-12)?");
            birthMonth = scan.nextInt();
        }

        //determine voting eligibility
        boolean canVote = true;

        if ((age < 18) || (age == 18 && (birthMonth == 12))) {
            canVote = false;
        }

        //present a suitable message
        if (!canVote) {
            System.out.println("Too young to vote. Check again next year!");
        } else { //if eligible to vote, ask whether they are registered
            System.out.println("You are eligible to vote. Have you already registered? (y/n)");
            String registered = scan.nextLine();

            if (registered.equalsIgnoreCase("y")) {
                System.out.println("Good for you, " +  firstName + " " + lastName + "!");
            } else {
                System.out.println("You should register soon, " +  firstName + " " + lastName + "!");
            }
        }
        scan.close();
        System.out.println("Bye now.");
    }
}