/*****************************************************************************
*
* MODULE:       OGR driver 
*   	    	
* AUTHOR(S):    Radim Blazek
*
* PURPOSE:      DB driver for OGR sources     
*
* COPYRIGHT:    (C) 2004 by the GRASS Development Team
*
*               This program is free software under the GNU General Public
*   	    	License (>=v2). Read the file COPYING that comes with GRASS
*   	    	for details.
*
*****************************************************************************/
#include <stdlib.h>
#include <string.h>
#include "gis.h"
#include "dbmi.h"
#include "ogr_api.h"
#include "globals.h"
#include "proto.h" 
#include "glocale.h"

int
db__driver_fetch( dbCursor *cn, int position, int *more )
{
    cursor     *c;
    dbToken    token;    
    dbTable    *table;
    int        i, col;

    G_debug (3, "db_driver_fetch()" );

    /* get cursor token */
    token = db_get_cursor_token(cn);

    /* get the cursor by its token */
    if (!(c = (cursor *) db_find_token(token))) {
	append_error ("Cursor not found");
	report_error();
	return DB_FAILED;
    }

    /* fetch on position */
    switch (position) {
	case DB_NEXT:
            G_debug (4, "DB_NEXT:" );
            if ( c->hFeature )
	        OGR_F_Destroy( c->hFeature );
	    c->hFeature = OGR_L_GetNextFeature( c->hLayer );
	    break;
	case DB_CURRENT:
	    break;
	case DB_PREVIOUS:
	    append_error ("DB_PREVIOUS not supported");
	    report_error();
	    return DB_FAILED;
	    break;
	case DB_FIRST:
	    OGR_L_ResetReading ( c->hLayer );
            if ( c->hFeature )
	        OGR_F_Destroy( c->hFeature );
	    c->hFeature = OGR_L_GetNextFeature( c->hLayer );
	    break;
	case DB_LAST:
	    append_error ("DB_LAST not supported");
	    report_error();
	    return DB_FAILED;
	    break;
    };
    
    if ( c->hFeature == NULL ) {
	*more = 0;
	return DB_OK;
    }

    *more = 1;

    /* get the data out of the descriptor into the table */
    table = db_get_cursor_table(cn);

    col = -1;
    for (i = 0; i < c->ncols; i++) {
	int       ogrType, sqlType;
	dbColumn  *column;
	dbValue   *value;

	if ( !(c->cols[i]) ) { continue; } /* unknown type */
	col++;

	column = db_get_table_column (table, col);
	ogrType  = db_get_column_host_type(column);
	sqlType = db_get_column_sqltype(column);

	value  = db_get_column_value (column);
	db_zero_string (&value->s);

	/* Is null? */
	if ( OGR_F_IsFieldSet ( c->hFeature, i) ) {
	    value->isNull = 0;
	} else {
	    value->isNull = 1;
	    continue;
	}

	G_debug (3, "col %d, ogrType %d, sqlType %d: val = '%s'", 
		    col, ogrType, sqlType, OGR_F_GetFieldAsString( c->hFeature, i) );
	
	switch ( ogrType ) {
	    case OFTInteger:
	    	value->i = OGR_F_GetFieldAsInteger ( c->hFeature, i );
		break;
		
	    case OFTReal:
	    	value->d = OGR_F_GetFieldAsDouble ( c->hFeature, i );
		break;

	    case OFTString:
		db_set_string ( &(value->s), (char *) OGR_F_GetFieldAsString(c->hFeature, i) );
		break;

	    default:
		G_warning ( _("Unknown type") );
		break;
	}
    }
    G_debug (4, "Row fetched" );
    return DB_OK;
}

int
db__driver_get_num_rows (cn )
            dbCursor *cn;
{
    cursor     *c;
    dbToken    token;

    G_debug (3, "db_driver_get_num_rows()" );

    /* get cursor token */
    token = db_get_cursor_token(cn);

    /* get the cursor by its token */
    if (!(c = (cursor *) db_find_token(token))) {
       append_error("Cursor not found");
       report_error();
       return DB_FAILED;
    }

    return ( OGR_L_GetFeatureCount ( c->hLayer, 1 ) );
}

