//  Weddingdates.m  Copyright (c) Kari Laitinen

//  http://www.naturalprogramming.com

//  2013-07-15  Objective-C version of this file was created.
//  2013-07-15  Last modification.

//  This program demonstrates the use of the following classes
//     ISODate
//     NSString
//     NSCharacterSet

#include  <stdio.h>
#import   <Foundation/Foundation.h>
#import   "class_isodate_oc.h"

int main( void )
{
   NSAutoreleasePool* autorelease_pool = [ [ NSAutoreleasePool alloc ] init ] ;

   //  At the beginning date_to_increment refers to an object that
   //  contains the current computer date.

   ISODate*  date_to_increment = [ [ ISODate alloc ] init ] ;

   int   number_of_dates_printed  =  0 ;

   printf( "\n These are easy-to-remember dates for weddings and"
           "\n other important events because the days and months"
           "\n consist of the digits used in the year: \n" ) ;

   while ( number_of_dates_printed  <  60 )
   {
      NSString* year_as_string = [ NSString stringWithFormat:
                                       @"%d", [ date_to_increment year ] ] ;
   
      NSString* month_as_string = [ NSString stringWithFormat:
                                       @"%d", [ date_to_increment month ] ] ;
   
      NSString* day_as_string = [ NSString stringWithFormat:
                                       @"%d", [ date_to_increment day ] ] ;
   
      NSCharacterSet* characters_in_year = 
        [ NSCharacterSet characterSetWithCharactersInString: year_as_string ] ;

      NSCharacterSet* characters_in_month = 
        [ NSCharacterSet characterSetWithCharactersInString: month_as_string ] ;

      NSCharacterSet* characters_in_day = 
        [ NSCharacterSet characterSetWithCharactersInString: day_as_string ] ;

      if ( [ characters_in_year isSupersetOfSet: characters_in_month ]  &&
           [ characters_in_year isSupersetOfSet: characters_in_day ]  )
      {
         // Now we have found a date that meets our requirements.

         if ( number_of_dates_printed  %  5  ==  0 )
         {
            printf( "\n" ) ;
         }

         NSString* text_to_print = [ NSString stringWithFormat:
                                     @"  %@", date_to_increment ] ;
      
         printf( "%s", [ text_to_print UTF8String ] ) ;

         number_of_dates_printed  ++  ;
      }

      [ date_to_increment increment ] ;
   }

   printf( "\n\n" ) ;

   [ autorelease_pool drain ] ;
}

//  During compilation class_isodate_oc.h must be in the same folder
//  with this program.