// CalendarInfo implementation (1992, Information Disciplines, Inc.)
// ---------------------------   (See CalendarInfo.hpp for details.)

#include "global.hpp"
#include "CalendarInfo.hpp"       /*  Declarations, also included by users */

//  Calendar arithmetic functions
//  -----------------------------

  bool CalendarInfo::isLeapYear (INT yyyy)
  {return (0 == yyyy % 400) || ((0 == yyyy % 4) && (0 != yyyy % 100));}

  bool CalendarInfo::isLegalYMD (INT yyyy, SHORT mm, SHORT dd)
  {return mm > 0 &&  mm <= 12
     &&   dd > 0 && (dd <= DAYS_IN_MONTH[mm]
                        || (dd == 29 && mm == 2 && isLeapYear(yyyy)));
  }

  short CalendarInfo::dayNumber                 //  Convert year-month-day
           (INT yyyy, INT mm, INT dd)       //    to year and day number
  {if  (!isLegalYMD(yyyy, mm, dd)) return 0;//  (Sometimes mistakenly
   int  ddd = DAYS_BEFORE_MONTH[mm] + dd;   //    called a "Julian date")
   if  (isLeapYear(yyyy) && mm > 2) ++ddd;
   return ddd;
  }

//  This routine performs the inverse of the above dayNumber function.
//  (No error checking -- result undefined for day number out of range)

  void CalendarInfo::ymd  (INT yyyy_in, short& mm_out, short& ddd_in_out)
  {int  dx = ddd_in_out;
   if (isLeapYear(yyyy_in))              //  For leap years
     if  (ddd_in_out > 60) --dx;         //     adjust day after 29 Feb.,
     else if (ddd_in_out == 60)          //  Test for 29 Feb. special case
          {mm_out = 2; ddd_in_out = 29; return;}
    
   mm_out = (dx + 28) / 29;              //  Estimate the month, then adjust
   
   if (mm_out == 13 || dx <= DAYS_BEFORE_MONTH[mm_out]) --mm_out;
    
   ddd_in_out = dx - DAYS_BEFORE_MONTH[mm_out];//  Compute day of month
   
cout << "Result is " << mm_out << '-' <<  ddd_in_out << endl;    
   return;
  }

//  Conversion functions to external representations
//  --------------------

   SimpleString CalendarInfo::toString(INT yyyy, SHORT mm, SHORT dd)
    {return SimpleString::toString(yyyy,10) + '-' 
          + SimpleString::toString(mm,10)   + '-'
          + SimpleString::toString(dd,10);
    }
     
   SimpleString CalendarInfo::toEnglish            //  Date to American English 
            (INT yyyy, SHORT mm, SHORT dd)         //     conversion
   {return SimpleString(MONTH_NAME[mm]) 
           + ' '  + SimpleString::toString(dd,10) 
           + ", " + SimpleString::toString(yyyy,10);
   }