/* This is the twelveth lab of Lab EE107
The purpose of this lab for illustrating and determining tomorrow's date using
function and structures with a function "struct date dateUpdate (struct date today)."
to  return an input argument for the struct.

Creating the code and free of syntax and grammatical errors.
Author: Ekwegbalum Unachukwu
Star ID:do2170dt
Date: April 16th, 2024.
*/

#include <stdio.h>
#include <stdbool.h>

// Define a structure for date
struct date_EU {
    int month;
    int day;
    int year;
};

// Function prototypes
int numberOfDays_EU(struct date_EU d);
struct date_EU dateUpdate_EU(struct date_EU today);

int main(void) {
    struct date_EU today_EU, tomorrow_EU;

    // Get today's date from the user
    printf("Enter today's date (mm dd yyyy): ");
    scanf("%i%i%i", &today_EU.month, &today_EU.day, &today_EU.year);

    // Calculate tomorrow's date
    tomorrow_EU = dateUpdate_EU(today_EU);

    // Print tomorrow's date
    printf("Tomorrow's date is %i/%i/%.2i.\n", tomorrow_EU.month, tomorrow_EU.day, tomorrow_EU.year % 100);

    return 0;
}

// Function to find the number of days in a month
int numberOfDays_EU(struct date_EU d) {
    int days;
    const int daysPerMonth[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

    // Check if it's a leap year and adjust days for February
    if ((d.year % 4 == 0 && d.year % 100 != 0) || d.year % 400 == 0)
        daysPerMonth[1] == 29; // February has 29 days in a leap year
        else
        days = daysPerMonth[d.month - 1];
    return days;
}

// Function to update the date to the next day
struct date_EU dateUpdate_EU(struct date_EU today) {
    struct date_EU tomorrow;
    int numberOfDays_EU(struct date_EU d);

    // If it's not the end of the month
    if (today.day != numberOfDays_EU(today)) {
        tomorrow.day = today.day + 1;
        tomorrow.month = today.month;
        tomorrow.year = today.year;
    }
    else { // If it's the end of the month
        if (today.month == 12) { // If it's the end of the year
            tomorrow.day = 1;
            tomorrow.month = 1;
            tomorrow.year = today.year + 1;
        }
        else { // If it's not the end of the year
            tomorrow.day = 1;
            tomorrow.month = today.month + 1;
            tomorrow.year = today.year;
        }
    }

    return tomorrow;
}