/*
 *	 Copyright 1999, Dmitry Kovalev <mit@openldap.org>, All rights reserved.
 *
 *	 Redistribution and use in source and binary forms are permitted only
 *	 as authorized by the OpenLDAP Public License.	A copy of this
 *	 license is available at http://www.OpenLDAP.org/license.html or
 *	 in file LICENSE in the top-level directory of the distribution.
 */

#include "portable.h"

#ifdef SLAPD_SQL

#include <stdio.h>
#include <sys/types.h>
#include "ac/string.h"
#include "ac/ctype.h"
#include "ac/stdarg.h"
#include "slap.h"
#include "lber_pvt.h"
#include "ldap_pvt.h"
#include "back-sql.h"
#include "schema-map.h"
#include "util.h"


char backsql_def_oc_query[] = 
	"SELECT id,name,keytbl,keycol,create_proc,delete_proc,expect_return "
	"FROM ldap_oc_mappings";
char backsql_def_at_query[] = 
	"SELECT name,sel_expr,from_tbls,join_where,add_proc,delete_proc,"
	"param_order,expect_return,sel_expr_u FROM ldap_attr_mappings "
	"WHERE oc_map_id=?";
char backsql_def_delentry_query[] = "DELETE FROM ldap_entries WHERE id=?";
char backsql_def_insentry_query[] = 
	"INSERT INTO ldap_entries (dn,oc_map_id,parent,keyval) "
	"VALUES (?,?,?,?)";
char backsql_def_subtree_cond[] = "ldap_entries.dn LIKE CONCAT('%',?)";
char backsql_def_upper_subtree_cond[] = "(ldap_entries.dn) LIKE CONCAT('%',?)";
char backsql_id_query[] = "SELECT id,keyval,oc_map_id FROM ldap_entries WHERE ";

/* TimesTen */
char backsql_check_dn_ru_query[] = "SELECT dn_ru from ldap_entries";

/*
 * Frequently used constants
 */
struct berval 
	bv_n_objectclass	= BER_BVC("objectclass"),
	bv_n_0_10		= BER_BVC("0.10");

struct berval *
backsql_strcat( struct berval *dest, int *buflen, ... )
{
	va_list		strs;
	int		cdlen, cslen, grow;
	char		*cstr;

	assert( dest );
	assert( dest->bv_val == NULL 
			|| dest->bv_len == strlen( dest->bv_val ) );
 
#if 0
	Debug( LDAP_DEBUG_TRACE, "==>backsql_strcat()\n" );
#endif

	va_start( strs, buflen );
	if ( dest->bv_val == NULL || *buflen <= 0 ) {
		dest->bv_val = (char *)ch_calloc( BACKSQL_STR_GROW, 
				sizeof( char ) );
		dest->bv_len = 0;
		*buflen = BACKSQL_STR_GROW;
	}
	cdlen = dest->bv_len;
	while ( ( cstr = va_arg( strs, char * ) ) != NULL ) {
		cslen = strlen( cstr );
		grow = BACKSQL_MAX( BACKSQL_STR_GROW, cslen );
		if ( *buflen - cdlen <= cslen ) {
			char	*tmp_dest;

#if 0
			Debug( LDAP_DEBUG_TRACE, "backsql_strcat(): "
				"buflen=%d, cdlen=%d, cslen=%d "
				"-- reallocating dest\n",
				*buflen, cdlen + 1, cslen );
#endif
			tmp_dest = (char *)ch_realloc( dest->bv_val,
					( *buflen ) + grow * sizeof( char ) );
			if ( tmp_dest == NULL ) {
				Debug( LDAP_DEBUG_ANY, "backsql_strcat(): "
					"could not reallocate string buffer.\n",
					0, 0, 0 );
				return NULL;
			}
			dest->bv_val = tmp_dest;
			*buflen += grow;
#if 0
			Debug( LDAP_DEBUG_TRACE, "backsql_strcat(): "
				"new buflen=%d, dest=%p\n", *buflen, dest, 0 );
#endif
		}
		AC_MEMCPY( dest->bv_val + cdlen, cstr, cslen + 1 );
		cdlen += cslen;
	}
	va_end( strs );

#if 0
	Debug( LDAP_DEBUG_TRACE, "<==backsql_strcat() (dest='%s')\n", 
			dest, 0, 0 );
#endif

	dest->bv_len = cdlen;

	return dest;
} 

int
backsql_entry_addattr(
	Entry		*e,
	struct berval	*at_name,
	struct berval	*at_val )
{
	struct berval		add_val[ 2 ];
	AttributeDescription	*ad;
	int			rc;
	const char		*text;

	Debug( LDAP_DEBUG_TRACE, "backsql_entry_addattr(): "
		"at_name='%s', at_val='%s'\n", 
		at_name->bv_val, at_val->bv_val, 0 );
	add_val[ 0 ] = *at_val;
	add_val[ 1 ].bv_val = NULL;
	add_val[ 1 ].bv_len = 0;

	ad = NULL;
	rc = slap_bv2ad( at_name, &ad, &text );
	if ( rc != LDAP_SUCCESS ) {
		Debug( LDAP_DEBUG_TRACE, "backsql_entry_addattr(): "
			"failed to find AttributeDescription for '%s'\n",
			at_name->bv_val, 0, 0 );
		return 0;
	}

	rc = attr_merge( e, ad, add_val );

	if ( rc != 0 ) {
		Debug( LDAP_DEBUG_TRACE, "backsql_entry_addattr(): "
			"failed to merge value '%s' for attribute '%s'\n",
			at_val->bv_val, at_name->bv_val, 0 );
		return 0;
	}
	
	Debug( LDAP_DEBUG_TRACE, "<==backsql_query_addattr()\n", 0, 0, 0 );
	return 1;
}

char *
backsql_get_table_spec( char **p )
{
	char		*s, *q;
	struct berval	res = { 0, NULL };
	int		res_len = 0;

	s = *p;
	while ( **p && **p != ',' ) {
		(*p)++;
	}

	if ( **p ) {
		*(*p)++ = '\0';
	}
	
#define BACKSQL_NEXT_WORD { \
		while ( *s && isspace( (unsigned char)*s ) ) s++; \
		if ( !*s ) return res.bv_val; \
		q = s; \
		while ( *q && !isspace( (unsigned char)*q ) ) q++; \
		if ( *q ) *q++='\0'; \
	}

	BACKSQL_NEXT_WORD;
	/* table name */
	backsql_strcat( &res, &res_len, s, NULL );
	s = q;

	BACKSQL_NEXT_WORD;
	if ( !strcasecmp( s, "as" ) ) {
		s = q;
		BACKSQL_NEXT_WORD;
	}
#if 0
	backsql_strcat( &res, &res_len, " AS ", s, NULL );
	/* oracle doesn't understand AS :( */
#endif
	/* table alias */
	backsql_strcat( &res, &res_len, " ", s, NULL);
	return res.bv_val;
}

int
backsql_merge_from_clause( char **dest_from, int *dest_len, char *src_from )
{
	char		*s, *p, *srcc, *pos, e;
	struct berval	res = { 0 , NULL };

#if 0
	Debug( LDAP_DEBUG_TRACE, "==>backsql_merge_from_clause(): "
		"dest_from='%s',src_from='%s'\n",
 		dest_from, src_from, 0 );
#endif
	srcc = ch_strdup( src_from );
	p = srcc;

	if ( *dest_from != NULL ) {
		res.bv_val = *dest_from;
		res.bv_len = strlen( *dest_from );
	}
	
	while ( *p ) {
		s = backsql_get_table_spec( &p );
#if 0
		Debug( LDAP_DEBUG_TRACE, "backsql_merge_from_clause(): "
			"p='%s' s='%s'\n", p, s, 0 );
#endif
		if ( res.bv_val == NULL ) {
			backsql_strcat( &res, dest_len, s, NULL );

		} else {
			pos = strstr( res.bv_val, s );
			if ( pos == NULL ) {
				backsql_strcat( &res, dest_len, ",", s, NULL );
			} else if ( ( e = pos[ strlen( s ) ] ) != '\0' && e != ',' ) {
				backsql_strcat( &res, dest_len, ",", s, NULL );
			}
		}
		
		if ( s ) {
			ch_free( s );
		}
	}
#if 0
	Debug( LDAP_DEBUG_TRACE, "<==backsql_merge_from_clause()\n", 0, 0, 0 );
#endif
	free( srcc );
	*dest_from = res.bv_val;

	return 1;
}

#endif /* SLAPD_SQL */