//File: Birthdays.java
//Author: Ian Bartlow
//Date: 2/20/20
//Purpose: To compare 2 peoples birthdays and see which one is closest,
//then display the amoutn of days until their birthday
import java.util.*;
import java.text.SimpleDateFormat;//got this to format the calendar api date,
//from http://tutorials.jenkov.com/java-internationalization/simpledateformat.html



public class Birthdays
{



	public static void main(String args[])
	{
		Scanner sc = new Scanner(System.in);

		System.out.println(); //top blank line
		intro();
		System.out.println();
		int yourBirthMonth = getYourBirthMonth(sc);
		int yourBirthday = getYourBirthday(sc);
		System.out.println();
		int friendBirthMonth = getFriendBirthMonth(sc);
		int friendBirthday = getFriendBirthday(sc);
		int currentDay = getCurrentDay();
		int currentMonth = getCurrentMonth();
		int currentDaysInYear = calculate(currentDay,currentMonth);
		int yourDaysInYear = calculate(yourBirthday, yourBirthMonth);
		int friendDaysInYear = calculate(friendBirthday, friendBirthMonth);




		if (yourBirthMonth > currentMonth && friendBirthMonth < currentMonth)
		{
			yourDaysInYear = yourDaysInYear - currentDaysInYear;
			friendDaysInYear = 365 - friendDaysInYear - currentDaysInYear;

			System.out.println("Your birthday is first!");
            System.out.println("You have " + yourDaysInYear + " day(s) to wait until your birthday (" + yourBirthday + "/" + yourBirthMonth + ").");
            System.out.println("Your friend has " + friendDaysInYear + " day(s) to wait until their birthday (" + friendBirthday + "/" + friendBirthMonth + ").");

		}

		else if (yourBirthMonth < currentMonth && friendBirthday > currentMonth)
		{
			yourDaysInYear = 365 - yourDaysInYear - currentDaysInYear;
			friendDaysInYear = friendDaysInYear - currentDaysInYear;

			System.out.println("Your friend's birthday is first!");
            System.out.println("You have " + yourDaysInYear + " day(s) to wait until your birthday (" + yourBirthday + "/" + yourBirthMonth + ").");
            System.out.println("Your friend has " + friendDaysInYear + " day(s) to wait until their birthday (" + friendBirthday + "/" + friendBirthMonth + ").");

		}

		else if(yourBirthMonth < currentMonth && friendBirthMonth < currentMonth)
		{
			yourDaysInYear = 365 - yourDaysInYear - currentDaysInYear;
			friendDaysInYear = 365 - friendDaysInYear - currentDaysInYear;

			if (yourBirthMonth < friendBirthMonth)
			{
				System.out.println("Your birthday is first!");
           		System.out.println("You have " + yourDaysInYear + " day(s) to wait until your birthday (" + yourBirthday + "/" + yourBirthMonth + ").");
           	 	System.out.println("Your friend has " + friendDaysInYear + " day(s) to wait until their birthday (" + friendBirthday + "/" + friendBirthMonth + ").");

			}

			else if(friendBirthMonth < yourBirthMonth)
			{
				System.out.println("Your friend's birthday is first!");
           	 	System.out.println("You have " + yourDaysInYear + " day(s) to wait until your birthday (" + yourBirthday + "/" + yourBirthMonth + ").");
           		System.out.println("Your friend has " + friendDaysInYear + " day(s) to wait until their birthday (" + friendBirthday + "/" + friendBirthMonth + ").");

			}
			else if (yourBirthday < friendBirthday)
			{

				System.out.println("Your birthday is first!");
           		System.out.println("You have " + yourDaysInYear + " day(s) to wait until your birthday (" + yourBirthday + "/" + yourBirthMonth + ").");
           	 	System.out.println("Your friend has " + friendDaysInYear + " day(s) to wait until their birthday (" + friendBirthday + "/" + friendBirthMonth + ").");

			}

			else if(friendBirthday < yourBirthday)
			{

				System.out.println("Your friend's birthday is first!");
           	 	System.out.println("You have " + yourDaysInYear + " day(s) to wait until your birthday (" + yourBirthday + "/" + yourBirthMonth + ").");
           		System.out.println("Your friend has " + friendDaysInYear + " day(s) to wait until their birthday (" + friendBirthday + "/" + friendBirthMonth + ").");

			}

			else
			{
				System.out.println("You were both born on the same day!");
			}
		}

		else if(yourBirthday > currentMonth && friendBirthMonth > currentMonth)
		{
			yourDaysInYear = yourDaysInYear - currentDaysInYear;
			friendDaysInYear = friendDaysInYear - currentDaysInYear;

			if(yourBirthMonth < friendBirthMonth)
			{
				System.out.println("Your birthday is first!");
           		System.out.println("You have " + yourDaysInYear + " day(s) to wait until your birthday (" + yourBirthday + "/" + yourBirthMonth + ").");
           	 	System.out.println("Your friend has " + friendDaysInYear + " day(s) to wait until their birthday (" + friendBirthday + "/" + friendBirthMonth + ").");

			}
			else if(friendBirthMonth < yourBirthMonth)
			{
				System.out.println("Your friend's birthday is first!");
           	 	System.out.println("You have " + yourDaysInYear + " day(s) to wait until your birthday (" + yourBirthday + "/" + yourBirthMonth + ").");
           		System.out.println("Your friend has " + friendDaysInYear + " day(s) to wait until their birthday (" + friendBirthday + "/" + friendBirthMonth + ").");

			}

			else if(yourBirthday < friendBirthday)
			{
				System.out.println("Your birthday is first!");
           		System.out.println("You have " + yourDaysInYear + " day(s) to wait until your birthday (" + yourBirthday + "/" + yourBirthMonth + ").");
           	 	System.out.println("Your friend has " + friendDaysInYear + " day(s) to wait until their birthday (" + friendBirthday + "/" + friendBirthMonth + ").");

			}

			else if(friendBirthday < yourBirthday)
			{
				System.out.println("Your friend's birthday is first!");
           	 	System.out.println("You have " + yourDaysInYear + " day(s) to wait until your birthday (" + yourBirthday + "/" + yourBirthMonth + ").");
           		System.out.println("Your friend has " + friendDaysInYear + " day(s) to wait until their birthday (" + friendBirthday + "/" + friendBirthMonth + ").");

			}

			else
			{
				System.out.println("You were both born on the same day!");
			}


		}
		System.out.println(); //bottom blank



	}

	public static void intro()
	{
		System.out.println("Program that computes number of days until");
		System.out.println("your birthday and the birthday of a frined.");
		System.out.println("Written by Ian Bartlow.");

	}

	public static int getYourBirthMonth(Scanner sc)
	{
		System.out.print("Enter the month of your birth (1-12): ");
		int yourBirthMonth = sc.nextInt();
		System.out.println(); // for turnin
		return yourBirthMonth;

	}

	public static int getYourBirthday(Scanner sc)
	{
		System.out.print("Enter the day of the month of your birth (1-31): ");
		int yourBirthday = sc.nextInt();
		System.out.println(); //for turnin
		return yourBirthday;
	}

	public static int getFriendBirthMonth(Scanner sc)
	{
		System.out.print("Enter the month of your friend's birth (1-12): ");
		int friendBirthMonth = sc.nextInt();
		System.out.println(); //for turnin
		return friendBirthMonth;
	}

	public static int getFriendBirthday(Scanner sc)
	{
		System.out.print("Enter the day of the month of your friend's birth (1-31): ");
		int friendBirthday = sc.nextInt();
		System.out.println(); //for turnin
		return friendBirthday;
	}

	public static int getCurrentDay()
	{
		//got this from https://stackabuse.com/how-to-get-current-date-and-time-in-java/
		Calendar calendar = Calendar.getInstance();
		SimpleDateFormat dayFormatter = new SimpleDateFormat("dd");
		String stringDay = dayFormatter.format(calendar.getTime());
		int currentDay = Integer.parseInt(stringDay);
		return currentDay;
	}

	public static int getCurrentMonth()
	{

		Calendar calendar = Calendar.getInstance();
		SimpleDateFormat monthFormatter = new SimpleDateFormat("MM");
		String stringMonth = monthFormatter.format(calendar.getTime());
		int currentMonth = Integer.parseInt(stringMonth);
		return currentMonth;

	}

	public static int calculate(int days, int month)
	{
		int daysInYear = 0;
		if(month == 1)
		{
			daysInYear = 31 + days;
		}

		else if(month == 2)
		{
			daysInYear = 31 + 28 + days;
		}

		else if(month == 3)
		{
			daysInYear = 31 + 28 + 31 + days;
		}
		else if(month == 4)
		{
			daysInYear = 31 * 2 + 28 + 30 + days;
		}
		else if(month == 5)
		{
			daysInYear = 31 * 3 + 30  + 28 + days;
		}
		else if(month == 6)
		{
			daysInYear = 31 * 3 + 30 * 2 + 28 + days;
		}
		else if(month == 7)
		{
			daysInYear = 31 * 4 + 30 * 2 + 28 + days;
		}
		else if(month == 8)
		{
			daysInYear = 31 * 5 + 30 * 2 + 28 + days;
		}
		else if(month == 9)
		{
			daysInYear = 31 * 5 + 30 * 3 + 28 + days;
		}
		else if(month == 10)
		{
			daysInYear = 31 * 6 + 30 * 3 + 28 + days;
		}
		else if(month == 11)
		{
			daysInYear = 31 * 6 + 30 * 4 + 28 + days;
		}
		else if(month == 12)
		{
			daysInYear = 31 * 6 + 30 * 4 + 28 + days;
		}


		return daysInYear;
	}



}