Birthday FInal

// Julia Haligowska
// 2022-01-13
// CSE 142 AP CS A
// Birthday.java
//
// This program will calculate how many days are left until your next birthday (not including leap year), and will tell you a fun fact about my birthday at the end.

import java.util.*; // to use Scanner
public class Birthday {

    public static void main(String args[]) {
        Scanner console = new Scanner(System.in); //"spawning" in the scanner
        intro();

        System.out.println("Please enter today's date:");
        System.out.println("What is the month (1-12)?");

        int userInputTodayMonth = console.nextInt(); //prompting the user first time
        whichMonth(userInputTodayMonth);
        int userInputTodayDay= console.nextInt(); //prompting the user second time

        int todayDate = getDayOfYear(userInputTodayMonth, userInputTodayDay); //getting the final day for easier use later
        System.out.println(userInputTodayMonth + "/" + userInputTodayDay + " is day #" + todayDate + " of 365."); //putting it in through the method, and making it do the calculations !!
        System.out.println();

        System.out.println("Please enter your birthday:");
        System.out.println("What is the month (1-12)?");

        int userInputBdayMonth = console.nextInt(); //prompting the user third time
        whichMonth(userInputBdayMonth);
        int userInputBdayDay= console.nextInt(); //prompting the user fourth time

        int bdayDate = getDayOfYear(userInputBdayMonth, userInputBdayDay); //getting the final day AGAIN
        System.out.println(userInputBdayMonth + "/" + userInputBdayDay + " is day #" + bdayDate + " of 365.");
        System.out.println();
        
        //this if statement checks if today is your birthday, or if your birthday is tomorrow.
        if (bdayDate == todayDate) {
            System.out.println("Happy Birthday!");
            System.out.println();
        } else if (bdayDate - todayDate == 1) {
            System.out.println("Wow, your birthday is tomorrow!");
            System.out.println();
        } else { //anything else results in the FINAL "how many days before your birthday?" answer!
            int result = bdayDate - todayDate; //getting the final day count...
            int finalCheck = wrapAround(result); //..and putting it into the "wrap around year" checker
            System.out.println("Your next birthday is in " + finalCheck + " days."); //yay ((:
            System.out.println();
        }

        funFact(); //my birthday is 11/15!

    }

    //the intro text
    public static void intro() {
        System.out.print("This program tells you how many days");
        System.out.print("it will be until your next birthday.");
        System.out.println();
    }

    //calculates whether the day "wraps around", or if the birthday happens the proceeding year
    public static int wrapAround(int dayDiff) {
        if (dayDiff < 0) { //if statement to account for the next year beeswax
            dayDiff = dayDiff + 365; // for example, if bdayDate is 20 and today date is 120, result will be a negative integer. So, adding 365 will quite literally, even it out so that the final result will be accurate!
        }
        return dayDiff;
    }

    //program that puts out the appropiate question for days- wether a month has 31 days, 30 days, or 28 days!
    public static int whichMonth(int month) {
        if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) { // using || because it means or and i dont have to use too many if statements this way
            System.out.println("What is the day (1-31)?");
        } else if (month == 4 || month == 6 || month == 9 || month == 11) {
            System.out.println("What is the day (1-30)?");
        } else if (month == 2) {
            System.out.println("What is the day (1-28)?");
        }

        return month;
    }

    //program to get the day of the year, since it's in two major parts of the program
    public static int getDayOfYear(int month, int day) { //month and day will be used for if/else statements wooooo
        int[] allMonths = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; //array with all month's days! (0 is there for easy calculations)
        int cumSum = 0;
        for (int i = 0; i < month; i++) { //making a loop to calculate the cumulative sum (cumSum plz it's not erotic)
            cumSum += allMonths[i];
        }
        int cumDate = cumSum + day;
        return cumDate;
    }

    //prints the fun fact!
    public static void funFact() {
        System.out.println("Did you know? On 11/15/2001, Microsoft released the first-ever XBox, ");
        System.out.println("selling 1.5 million units before the end of 2001. Talk about a game changer!");
    }
}