/*
 * $Id$
 */

/*
 * Harbour Project source code:
 * Additional date functions
 *
 * Copyright 1999 Jose Lalin <dezac@corevia.com>
 * www - http://www.harbour-project.org
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version, with one exception:
 *
 * The exception is that if you link the Harbour Runtime Library (HRL)
 * and/or the Harbour Virtual Machine (HVM) with other files to produce
 * an executable, this does not by itself cause the resulting executable
 * to be covered by the GNU General Public License. Your use of that
 * executable is in no way restricted on account of linking the HRL
 * and/or HVM code into it.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA (or visit
 * their web site at http://www.gnu.org/).
 *
 */

#include <ctype.h>
#include <time.h>
#include "hbapi.h"
#include "hbapierr.h"
#include "hbapiitm.h"
#include "hbdate.h"

static int hb__daysinmonth[ 12 ] =
{ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

int hb_isleapyear( long lYear )
{
   HB_TRACE(HB_TR_DEBUG, ("hb_isleapyear(%ld)", lYear));

   return (( lYear % 4 == 0 && lYear % 100 != 0 ) || lYear % 400 == 0 )?1:0;
}

long hb_daysinmonth( long lMonth, long lYear )
{
   int i;

   HB_TRACE(HB_TR_DEBUG, ("hb_daysinmonth(%ld, %ld)", lMonth, lYear));

   i = hb_isleapyear( lYear );
   if( lMonth > 0 && lMonth < 13 )
     return hb__daysinmonth[ lMonth-1 ] + ((i&&lMonth == 2)?1:0);

   return 0;
}

long hb_doy( long lDay, long lMonth, long lYear )
{
   int i;
   int iDoy = 0;

   HB_TRACE(HB_TR_DEBUG, ("hb_doy(%ld, %ld, %ld)", lDay, lMonth, lYear));

   for( i = 1; i < lMonth; i++ )
      iDoy += hb_daysinmonth( i, lYear );
   iDoy += lDay;

   return iDoy;
}

long hb_wom( long lDay, long lMonth, long lYear )
{
   int iWom;

   HB_TRACE(HB_TR_DEBUG, ("hb_wom(%ld, %ld, %ld)", lDay, lMonth, lYear));

   iWom = lDay + hb_dow( 1, lMonth, lYear) - 1;
   if( iWom > 0 )
      return ( iWom - hb_dow( lDay, lMonth, lYear ) ) / 7 + 1 ;
   else
      return 0;
}

long hb_woy( long lDay, long lMonth, long lYear, BOOL bISO )
{
   int iWeek, n;

   HB_TRACE(HB_TR_DEBUG, ("hb_woy(%ld, %ld, %ld, %d)", lDay, lMonth, lYear, (int) bISO));

   lDay = hb_doy( lDay, lMonth, lYear );
   n = ( ( ( 1 - (bISO ? 1 : 0) ) % 7 ) ) - 1;
   lDay += (n>0)?1:0;
   iWeek = lDay / 7;
   if( bISO )
      iWeek += (n<4)?1:0;
   else
      ++iWeek;

   return iWeek;
}

HB_FUNC( AMONTHS )
{
   PHB_ITEM pReturn = hb_itemArrayNew( 12 );    /* Create array */
   PHB_ITEM pString;
   int i;

   for( i = 0; i < 12; i++ )
   {
      pString = hb_itemNew( NULL );
      hb_itemPutC( pString, hb_monthsname[ i ] );
      hb_itemArrayPut( pReturn, i+1, pString );
      hb_itemRelease ( pString );
   }
   hb_itemReturn ( pReturn );
   hb_itemRelease( pReturn );
}

HB_FUNC( ADAYS )
{
   PHB_ITEM pReturn = hb_itemArrayNew( 7 );    /* Create array */
   PHB_ITEM pString;
   int i;

   for( i = 0; i < 7; i++ )
   {
      pString = hb_itemNew( NULL );
      hb_itemPutC( pString, hb_daysname[ i ] );
      hb_itemArrayPut( pReturn, i+1, pString );
      hb_itemRelease ( pString );
   }
   hb_itemReturn ( pReturn );
   hb_itemRelease( pReturn );
}

HB_FUNC( ISLEAPYEAR )
{
   if( ISDATE( 1 ) )
   {
      PHB_ITEM pDate = hb_param( 1, IT_DATE );
      long lDay, lMonth, lYear;

      hb_dateDecode( hb_itemGetDL( pDate ), &lDay, &lMonth, &lYear );
      hb_retl( hb_isleapyear( lYear ) );
   }
   else
   {
      hb_errRT_TOOLS(EG_ARG, 4001, NULL, "ISLEAPYEAR");
   }
}

HB_FUNC( DAYSINMONTH )
{
   if( ISDATE( 1 ) )
   {
      PHB_ITEM pDate = hb_param( 1, IT_DATE );
      long lDay, lMonth, lYear;

      hb_dateDecode( hb_itemGetDL( pDate ), &lDay, &lMonth, &lYear );
      hb_retni( hb_daysinmonth( lMonth, lYear ) );
   }
   else
      hb_retni( 0 );
}

HB_FUNC( EOM )
{
   if( ISDATE( 1 ) )
   {
      PHB_ITEM pDate = hb_param( 1, IT_DATE );
      long lDay, lMonth, lYear;
      char szDateFormat[ 9 ];

      hb_dateDecode( hb_itemGetDL( pDate ), &lDay, &lMonth, &lYear );
      lDay = hb_daysinmonth( lMonth, lYear );
      sprintf( szDateFormat, "%04i%02i%02i", (int) lYear, (int) lMonth, (int) lDay );
      hb_retds( szDateFormat );
   }
   else
      hb_retds( "" );
}

HB_FUNC( BOM )
{
   if( ISDATE( 1 ) )
   {
      PHB_ITEM pDate = hb_param( 1, IT_DATE );
      long lDay, lMonth, lYear;
      char szDateFormat[ 9 ];

      hb_dateDecode( hb_itemGetDL( pDate ), &lDay, &lMonth, &lYear );
      sprintf( szDateFormat, "%04i%02i%02i", (int) lYear, (int) lMonth, 1 );
      hb_retds( szDateFormat );
   }
   else
      hb_retds( "" );
}

HB_FUNC( WOM )
{
   if( ISDATE( 1 ) )
   {
      PHB_ITEM pDate = hb_param( 1, IT_DATE );
      long lDay, lMonth, lYear;

      hb_dateDecode( hb_itemGetDL( pDate ), &lDay, &lMonth, &lYear );
      hb_retni( hb_wom( lDay, lMonth, lYear ) );
   }
   else
      hb_retni( 0 );
}

HB_FUNC( DOY )
{
   if( ISDATE( 1 ) )
   {
      PHB_ITEM pDate = hb_param( 1, IT_DATE );
      long lDay, lMonth, lYear;

      hb_dateDecode( hb_itemGetDL( pDate ), &lDay, &lMonth, &lYear );
      hb_retni( hb_doy( lDay, lMonth, lYear ) );
   }
   else
      hb_retni( 0 );
}

/* Return the nWeek of the year (1 - 52, 0 - 52 if ISO) */

HB_FUNC( WOY )
{
   if( ISDATE( 1 ) )
   {
      PHB_ITEM pDate = hb_param( 1, IT_DATE );
      long lDay, lMonth, lYear;

      hb_dateDecode( hb_itemGetDL( pDate ), &lDay, &lMonth, &lYear );
      hb_retni( hb_woy( lDay, lMonth, lYear, ISLOG( 2 ) ? hb_parl( 2 ) : TRUE ) );
   }
   else
      hb_retni( 0 );
}

HB_FUNC( EOY )
{
   if( ISDATE( 1 ) )
   {
      PHB_ITEM pDate = hb_param( 1, IT_DATE );
      long lDay, lMonth, lYear;
      char szDateFormat[ 9 ];

      hb_dateDecode( hb_itemGetDL( pDate ), &lDay, &lMonth, &lYear );
      sprintf( szDateFormat, "%04i%02i%02i", (int) lYear, 12, 31 );
      hb_retds( szDateFormat );
   }
   else
      hb_retds( "" );
}

HB_FUNC( BOY )
{
   if( ISDATE( 1 ) )
   {
      PHB_ITEM pDate = hb_param( 1, IT_DATE );
      long lDay, lMonth, lYear;
      char szDateFormat[ 9 ];

      hb_dateDecode( hb_itemGetDL( pDate ), &lDay, &lMonth, &lYear );
      sprintf( szDateFormat, "%04i%02i%02i", (int) lYear, 1, 1 );
      hb_retds( szDateFormat );
   }
   else
      hb_retds( "" );
}

HB_FUNC( DATETIME )
{
   time_t current_time;
   char * szResult = ( char * ) hb_xgrab( 26 );

   time( &current_time );

   szResult = strcpy( szResult, ctime( &current_time ) );

   hb_retc( szResult );
   hb_xfree( szResult );
}