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 */
package lab3part4switch;

import java.util.Scanner;

/**
 *
 * @author jcmtiernan
 */
public class Lab3Part4switch {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        String monthName;
        String dayNum;
        String yearNum;
        String sp = " ";
        int day;
        int month;
        int year;
        boolean valid = true;
        Scanner in = new Scanner(System.in);
        
        System.out.println("Please enter a date in the form of month name then day number comma year number");
        System.out.println("seperating the month and day by a space and putting a space after the comma.");
        System.out.println("Use this format Mmmmmmm dd, yyyy using one or two digits"+
                " for day and two or four digits for year");
        System.out.print("Please enter your date: ");    
        
        monthName = in.next();
        dayNum = in.next();
        yearNum = in.next();
        
        System.out.println("You entered "+monthName+sp+dayNum+sp+yearNum);        
        
        // month name to integer value
        
        month = getMonthInt(monthName);  // calling the method
        if (month == -1)
        {
            valid = false;
        }
        
        System.out.println("After call to getMonthInt, month is  "+month);  

        char first = dayNum.charAt(0);
        boolean isDayNum = ((( ((first == '0')||(first == '1')) ||
                               ((first == '2')||(first == '3')) ) ||
                             ( ((first == '4')||(first == '5')) ||
                               ((first == '6')||(first == '7')) )) ||
                               ((first == '8')||(first == '9')) );
        
        if ((isDayNum) && (dayNum.length() == 3))
        {
            // This turns the first two digits of string dayNum into an int
            day = Integer.parseInt(dayNum.substring(0,2));  

        }
        else if ((isDayNum) && (dayNum.length() == 2))
        {
            // This turns the first two digits of string dayNum into an int
            day = Integer.parseInt(dayNum.substring(0,1));  

        }        
        else
        {
            day = -1;
            valid = false;
        }

  
        
        first = yearNum.charAt(0);
        boolean isYearNum = ((( ((first == '0')||(first == '1')) ||
                               ((first == '2')||(first == '3')) ) ||
                             ( ((first == '4')||(first == '5')) ||
                               ((first == '6')||(first == '7')) )) ||
                               ((first == '8')||(first == '9')) );
        
        if (isYearNum)
        {
            year = Integer.parseInt(yearNum);  // This turns the string dayNum into an int
        }
        else
        {
            year = 999999;
            valid = false;
        }
        
        if (year < 100)
        {
            year += 2000;
        }
        
                
        if(valid)
        {
            valid = validateDay(day, month, year);
        }
        
        /*
         * Copy the code from part 3 year check here
        */
        
        if (valid)
        {
            System.out.print("Your date is "+month+"/"+day+"/"+year+"\n");
        }
        else
        {
            System.out.println("Your date is invalid");
        }           
        
                
    }  // main method
    
    public static int getMonthInt(String monthNm)   
    {
        int month;

            switch (monthNm)
            {
                case "January" :
                case "january":
                case "Jan.":  month = 1;
                              break;
                case "February" :
                case "february":
                case "Feb.":  month = 2;
                              break;  
                case "March" :
                case "march" :
                case "Mar." : month = 3;
                             break;
                case "April" :
                case "april" :
                case "Apr." : month = 4;
                             break;

                case "May" :
                case "may" : month = 5;
                             break;
                case "June" :    
                case "june" :
                case "Jun." : month = 6;
                    break;
                case "July" :                 
                case "july" : 
                case "Jul." : month = 7;             
                    break;
                case "August" :                 
                case "august" : 
                case "Aug." : month = 8;            
                    break;
                case "September" :                 
                case "september" : 
                case "Sept." : month = 9;             
                    break;                
                case "October" :                 
                case "october" : 
                case "Oct." : month = 10;               
                    break;
                case "November" :                 
                case "november" : 
                case "Nov." : month = 11;             
                    break;                
                case "December" :                 
                case "december" : 
                case "Dec." : month = 12;             
                    break;                    
                default : month = -1;

            }

        return month;
    }  // getMonthInt
    
    public static boolean validateDay(int day, int month, int year)
    {
        
        boolean valid = true;
        
          if (day > 0)
        {
            if (( ((month == 1) || (month == 3 )) || ((month == 5) || (month == 7)) ) || 
                ( ((month == 8) || (month == 10)) ||  (month == 12)) )
            {
                if (day > 31)
                {
                    valid = false;
                }
            }
            else if (( ((month == 4) || (month == 6 )) || ((month == 9) || (month == 11)) ))
            {
                if (day > 30)
                {
                    valid = false;
                }            
            }
            else if (month == 2)
            {
                if (isLeapYear(year))                      
                {
                  if(day > 29)
                  {
                      valid = false;
                  }
                }   
                else if (day > 28)
                {
                    valid = false;
                }
            }
        }
        else
        {
            valid = false;
        }
        
        return valid;
    }
    
    private static boolean isLeapYear(int year)
    {
        boolean ly = false;
        if ((year % 4) == 0)
        {
            if ((year % 100) != 0)
            {
                ly = true;
            }
            else if ((year % 400) == 0)
            {
                ly = true;
            }
        }
        
        return ly;
    }
    
    
}