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package calendar;

import java.util.Scanner;
public class Calendar {


      public static int spDayInMonth = 0;
    public static int weeksInQuarter = 0;
    public static int spDayInSemiYear = 0;
    public static int cmpWeeks = 0;
    public static int firstDayy = 0;
    
    public static String days[] = {"S", "M", "T", "W", "Th", "F", "Sa"};
    public static String months[] = {"JANUARY", "FEBRUARY", "MARCH", "APRIL", "MAY", "JUNE", "JULY", "AUGUST",
"SEPTEMBER", "OCTOBER", "NOVEMBER", "DECEMBER"};
    public static int max[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter a year: ");
        int year = sc.nextInt();
        sc.nextLine();
        System.out.print("What is the first day of January? ");
        String firstDay = sc.nextLine();
        firstDayy = getDay(firstDay);
        if (isLeap(year)) {
            max[1] = 29;
        }
        
        //Question number one
        System.out.print("\n1. HOW MANY SPECIFIC DAY ARE THERE IN A SPECIFIC MONTH?"
        + "\n - What is the specific day? ");
        String q1Day = sc.nextLine();
        System.out.print(" - What is the specific month? ");
        String q1Month = sc.nextLine();
        question1(year, q1Day, q1Month);
        System.out.println("There are " + spDayInMonth + " " + q1Day + "s on " + q1Month+".");
        
        //Question number two
        System.out.print("\n2. HOW MANY WEEKS ARE THERE IN A SPECIFIC QUARTER?"
        + "\n - What is the particular quarter? [1,2,3,4]: ");
        int q2Quarter = sc.nextInt();
        String quarter = "";
        switch(q2Quarter){
        case 1:
        quarter = "first";
        break;
        case 2:
        quarter = "second";
        break;
        case 3:
        quarter = "third";
        break;
        case 4:
        quarter = "fourth";
        break;
        default:
        System.out.print("ERROR");
        break;
        }
        question2(year, q2Quarter);
        System.out.println("There are "+weeksInQuarter+" weeks in the "+quarter+" quarter of "+year+".");
        
        
        //Question number three
        sc.nextLine();
        System.out.print("\n3. HOW MANY SPECIFIC DAY ARE THERE IN A SEMI-YEAR?"
        + "\n - What is the specific day? ");
        String q3Day = sc.nextLine();
        System.out.print(" - What is the specific semi year? [1,2]: ");
        int q3Semi = sc.nextInt();
        question3(year, q3Day, q3Semi);
        
        String semi = "first";
        if(q3Semi == 2){
        semi = "second";
        }
        System.out.println("There are " + spDayInSemiYear + " " + q3Day + "s on the " + semi +" half of "+year+".");
        //Question number four
        System.out.println("\n4. HOW MANY COMPLETE WEEKS ARE THERE IN "+year+"?");
        question4(year);
        System.out.println("There are "+cmpWeeks+" complete weeks in "+year+".");
        
        System.out.println("========================================================");
        printCalendar(year, firstDay);
    }
    static int dayOfJanOne(int year) {
        int day = 0;
        int yr = year - 1;
        day = (1 + (5 * (yr % 4)) + (4 * (yr % 100)) + (6 * (yr % 400))) % 7;
        return day;
    }
    static boolean isLeap(int year) {
        return ((year % 4 == 0) && (year % 100 != 0) || (year % 400 == 0));
    }
    static void printCalendar(int year, String firstDay) {
        int CurrentDayOfWeek = firstDayy;
        int day = 1;
        System.out.println();
        for (int m = 0; m < months.length; m++) {
            System.out.println(months[m] + " " + year);
            for (int i = 0; i < days.length; i++) {
                System.out.printf("%3s", days[i]);
            }
            System.out.println();
            if(CurrentDayOfWeek == 7){
            CurrentDayOfWeek = 0;
            }
            for (int i = 0; i < CurrentDayOfWeek; i++) {
                System.out.printf("%3s", "");
            }
            while (day <= max[m]) {
                while (CurrentDayOfWeek < days.length && day <= max[m]) {
                    System.out.printf("%3s", day);
                    day++;
                    CurrentDayOfWeek++;
                }
                if (day-1 != max[m]) {
                    CurrentDayOfWeek = 0;
                }
                System.out.println();
            }
            System.out.println();
            day = 1;
        }
    }
    static void question1(int year, String q1Day, String q1Month) {
        int q1D = getDay(q1Day);
        int q1M = getMonth(q1Month);
        int CurrentDayOfWeek = firstDayy;
        int day = 1;
        
        for (int m = 0; m < months.length; m++) {
            if(CurrentDayOfWeek == 7){
            CurrentDayOfWeek = 0;
            }
            while (day <= max[m]) {
                while (CurrentDayOfWeek < days.length && day <= max[m]) {
                    if (m == q1M && CurrentDayOfWeek == q1D) {
                       spDayInMonth++;
                    }
                    day++;
                    CurrentDayOfWeek++;
                }
                if (day - 1 != max[m]) {
                    CurrentDayOfWeek = 0;
                }
            }
            day = 1;
        }
    }
    
    static void question2(int year, int q2Quarter){
    int startMonth = 0, endMonth = 0;
    switch(q2Quarter){
    case 1:
    startMonth = 0;
    endMonth = 2;
    break;
    case 2:
    startMonth = 3;
    endMonth = 5;
    break;
    case 3:
    startMonth = 6;
    endMonth = 8;
    break;
    case 4:
    startMonth = 9;
    endMonth = 11;
                break;
    default:
    System.out.print("ERROR");
    break;
    }
        int CurrentDayOfWeek = firstDayy;
        int day = 1;
        
        for (int m = 0; m < months.length; m++) {
        if(CurrentDayOfWeek == 7){
            CurrentDayOfWeek = 0;
            }
            while (day <= max[m]) {
                while (CurrentDayOfWeek < days.length && day <= max[m]) {
                    day++;
                    CurrentDayOfWeek++;
                }
                if (day - 1 != max[m]) {
                    CurrentDayOfWeek = 0;
                }
                if(m >= startMonth && m <= endMonth){
                weeksInQuarter++;
                }
            }
            day = 1;
        }
    }
    
    static void question3(int year, String q3Day, int q3Semi) {
    int startMonth = 0, endMonth = 0;
   
        int q2D = getDay(q3Day);
        if(q3Semi == 1){
        startMonth = 0;
        endMonth = 5;
        }else if(q3Semi == 2){
        startMonth = 6;
        endMonth = 11;
        }else{
        System.out.print("ERROR.");
        }
        
        int CurrentDayOfWeek = firstDayy;
        int day = 1;
        for (int m = 0; m < months.length; m++) {
            if(CurrentDayOfWeek == 7){
            CurrentDayOfWeek = 0;
            }
            while (day <= max[m]) {
                while (CurrentDayOfWeek < days.length && day <= max[m]) {
                    if ((m >= startMonth && m <= endMonth) && CurrentDayOfWeek == q2D) {
                    spDayInSemiYear++;
                    }
                    day++;
                    CurrentDayOfWeek++;
                }
                if (day - 1 != max[m]) {
                    CurrentDayOfWeek = 0;
                }
            }
            day = 1;
        }
    }
    static void question4(int year) {
    int daysCounter = 0;
        int CurrentDayOfWeek = firstDayy;
        int day = 1;
        for (int m = 0; m < months.length; m++) {
            if(CurrentDayOfWeek == 7){
            CurrentDayOfWeek = 0;
            }
            while (day <= max[m]) {
                while (CurrentDayOfWeek < days.length && day <= max[m]) {
                daysCounter++;
                    day++;
                    CurrentDayOfWeek++;
                }
                if (day - 1 != max[m]) {
                    CurrentDayOfWeek = 0;
                }
                if(daysCounter == 7){
                cmpWeeks++;
                }
                daysCounter = 0;
            }
            day = 1;
        }
    }
    
    static int getMonth(String month) {
        int monthNum = 0;
        switch (month.toLowerCase()) {
            case "january":
                monthNum = 0;
                break;
            case "february":
                monthNum = 1;
                break;
            case "march":
                monthNum = 2;
                break;
            case "april":
                monthNum = 3;
                break;
            case "may":
                monthNum = 4;
                break;
            case "june":
                monthNum = 6;
                break;
            case "july":
                break;
            case "august":
                monthNum = 4;
                break;
            case "september":
                monthNum = 5;
                break;
            case "october":
                monthNum = 6;
                break;
            case "november":
                break;
            case "december":
                monthNum = 4;
                break;
            default:
                System.out.print("Invalid month.");
                break;
        }
        return monthNum;
    }
    
    static int getDay(String day) {
        int dayNum = 0;
        switch (day.toLowerCase()) {
            case "monday":
                dayNum = 1;
                break;
            case "tuesday":
                dayNum = 2;
                break;
            case "wednesday":
                dayNum = 3;
                break;
            case "thursday":
                dayNum = 4;
                break;
            case "friday":
                dayNum = 5;
                break;
            case "saturday":
                dayNum = 6;
                break;
            case "sunday":
                break;
            default:
                System.out.print("Invalid day.");
                break;
        }
        return dayNum;
    }
}