/* index.c - routines for dealing with attribute indexes */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
 *
 * Copyright 2000-2005 The OpenLDAP Foundation.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted only as authorized by the OpenLDAP
 * Public License.
 *
 * A copy of this license is available in the file LICENSE in the
 * top-level directory of the distribution or, alternatively, at
 * <http://www.OpenLDAP.org/license.html>.
 */

#include "portable.h"

#include <stdio.h>

#include <ac/string.h>
#include <ac/socket.h>

#include "slap.h"
#include "back-bdb.h"
#include "lutil_hash.h"

static char presence_keyval[LUTIL_HASH_BYTES] = {0,0,0,1};
static struct berval presence_key = {LUTIL_HASH_BYTES, presence_keyval};

static slap_mask_t index_mask(
	Backend *be,
	AttributeDescription *desc,
	struct berval *atname )
{
	AttributeType *at;
	slap_mask_t mask = 0;

	bdb_attr_mask( be->be_private, desc, &mask );

	if( mask ) {
		*atname = desc->ad_cname;
		return mask;
	}

	/* If there is a tagging option, did we ever index the base
	 * type? If so, check for mask, otherwise it's not there.
	 */
	if( slap_ad_is_tagged( desc ) && desc != desc->ad_type->sat_ad ) {
		/* has tagging option */
		bdb_attr_mask( be->be_private, desc->ad_type->sat_ad, &mask );

		if ( mask && ( mask ^ SLAP_INDEX_NOTAGS ) ) {
			*atname = desc->ad_type->sat_cname;
			return mask;
		}
	}

	/* see if supertype defined mask for its subtypes */
	for( at = desc->ad_type; at != NULL ; at = at->sat_sup ) {
		/* If no AD, we've never indexed this type */
		if ( !at->sat_ad ) continue;

		bdb_attr_mask( be->be_private, at->sat_ad, &mask );

		if ( mask && ( mask ^ SLAP_INDEX_NOSUBTYPES ) ) {
			*atname = at->sat_cname;
			return mask;
		}
	}

	return 0;
}

int bdb_index_is_indexed(
	Backend *be,
	AttributeDescription *desc )
{
	slap_mask_t mask;
	struct berval prefix;

	mask = index_mask( be, desc, &prefix );

	if( mask == 0 ) {
		return LDAP_INAPPROPRIATE_MATCHING;
	}

	return LDAP_SUCCESS;
}

int bdb_index_param(
	Backend *be,
	AttributeDescription *desc,
	int ftype,
	DB **dbp,
	slap_mask_t *maskp,
	struct berval *prefixp )
{
	int rc;
	slap_mask_t mask;
	DB *db;

	mask = index_mask( be, desc, prefixp );

	if( mask == 0 ) {
		return LDAP_INAPPROPRIATE_MATCHING;
	}

	rc = bdb_db_cache( be, prefixp->bv_val, &db );

	if( rc != LDAP_SUCCESS ) {
		return rc;
	}

	switch( ftype ) {
	case LDAP_FILTER_PRESENT:
		if( IS_SLAP_INDEX( mask, SLAP_INDEX_PRESENT ) ) {
			*prefixp = presence_key;
			goto done;
		}
		break;

	case LDAP_FILTER_APPROX:
		if ( desc->ad_type->sat_approx ) {
			if( IS_SLAP_INDEX( mask, SLAP_INDEX_APPROX ) ) {
				goto done;
			}
			break;
		}

		/* Use EQUALITY rule and index for approximate match */
		/* fall thru */

	case LDAP_FILTER_EQUALITY:
		if( IS_SLAP_INDEX( mask, SLAP_INDEX_EQUALITY ) ) {
			goto done;
		}
		break;

	case LDAP_FILTER_SUBSTRINGS:
		if( IS_SLAP_INDEX( mask, SLAP_INDEX_SUBSTR ) ) {
			goto done;
		}
		break;

	default:
		return LDAP_OTHER;
	}

	return LDAP_INAPPROPRIATE_MATCHING;

done:
	*dbp = db;
	*maskp = mask;
	return LDAP_SUCCESS;
}

static int indexer(
	Operation *op,
	DB_TXN *txn,
	AttributeDescription *ad,
	struct berval *atname,
	BerVarray vals,
	ID id,
	int opid,
	slap_mask_t mask )
{
	int rc, i;
	DB *db;
	struct berval *keys;

	assert( mask );

	rc = bdb_db_cache( op->o_bd, atname->bv_val, &db );
	
	if ( rc != LDAP_SUCCESS ) {
		Debug( LDAP_DEBUG_ANY,
			"bdb_index_read: Could not open DB %s\n",
			atname->bv_val, 0, 0 );
		return LDAP_OTHER;
	}

	if( IS_SLAP_INDEX( mask, SLAP_INDEX_PRESENT ) ) {
		rc = bdb_key_change( op->o_bd, db, txn, &presence_key, id, opid );
		if( rc ) {
			goto done;
		}
	}

	if( IS_SLAP_INDEX( mask, SLAP_INDEX_EQUALITY ) ) {
		rc = ad->ad_type->sat_equality->smr_indexer(
			LDAP_FILTER_EQUALITY,
			mask,
			ad->ad_type->sat_syntax,
			ad->ad_type->sat_equality,
			atname, vals, &keys, op->o_tmpmemctx );

		if( rc == LDAP_SUCCESS && keys != NULL ) {
			for( i=0; keys[i].bv_val != NULL; i++ ) {
				rc = bdb_key_change( op->o_bd, db, txn, &keys[i], id, opid );
				if( rc ) {
					ber_bvarray_free_x( keys, op->o_tmpmemctx );
					goto done;
				}
			}
			ber_bvarray_free_x( keys, op->o_tmpmemctx );
		}
		rc = LDAP_SUCCESS;
	}

	if( IS_SLAP_INDEX( mask, SLAP_INDEX_APPROX ) ) {
		rc = ad->ad_type->sat_approx->smr_indexer(
			LDAP_FILTER_APPROX,
			mask,
			ad->ad_type->sat_syntax,
			ad->ad_type->sat_approx,
			atname, vals, &keys, op->o_tmpmemctx );

		if( rc == LDAP_SUCCESS && keys != NULL ) {
			for( i=0; keys[i].bv_val != NULL; i++ ) {
				rc = bdb_key_change( op->o_bd, db, txn, &keys[i], id, opid );
				if( rc ) {
					ber_bvarray_free_x( keys, op->o_tmpmemctx );
					goto done;
				}
			}
			ber_bvarray_free_x( keys, op->o_tmpmemctx );
		}

		rc = LDAP_SUCCESS;
	}

	if( IS_SLAP_INDEX( mask, SLAP_INDEX_SUBSTR ) ) {
		rc = ad->ad_type->sat_substr->smr_indexer(
			LDAP_FILTER_SUBSTRINGS,
			mask,
			ad->ad_type->sat_syntax,
			ad->ad_type->sat_substr,
			atname, vals, &keys, op->o_tmpmemctx );

		if( rc == LDAP_SUCCESS && keys != NULL ) {
			for( i=0; keys[i].bv_val != NULL; i++ ) {
				rc = bdb_key_change( op->o_bd, db, txn, &keys[i], id, opid );
				if( rc ) {
					ber_bvarray_free_x( keys, op->o_tmpmemctx );
					goto done;
				}
			}
			ber_bvarray_free_x( keys, op->o_tmpmemctx );
		}

		rc = LDAP_SUCCESS;
	}

done:
	return rc;
}

static int index_at_values(
	Operation *op,
	DB_TXN *txn,
	AttributeDescription *ad,
	AttributeType *type,
	struct berval *tags,
	BerVarray vals,
	ID id,
	int opid )
{
	int rc;
	slap_mask_t mask = 0;

	if( type->sat_sup ) {
		/* recurse */
		rc = index_at_values( op, txn, NULL,
			type->sat_sup, tags,
			vals, id, opid );

		if( rc ) return rc;
	}

	/* If this type has no AD, we've never used it before */
	if( type->sat_ad ) {
#ifdef LDAP_COMP_MATCH
		/* component indexing */
		ComponentReference* cr_list, *cr;

		bdb_attr_mask_cr( op->o_bd->be_private, type->sat_ad, &mask, &cr_list );
		if ( cr_list ) {
			for( cr = cr_list ; cr ; cr = cr->cr_next ) {
				rc = indexer( op, txn, cr->cr_ad, &type->sat_cname,
					cr->cr_nvals, id, opid,
					cr->cr_indexmask );
			}
		}
#else
		bdb_attr_mask( op->o_bd->be_private, type->sat_ad, &mask );
#endif
		ad = type->sat_ad;
	}

	if( mask ) {
		rc = indexer( op, txn, ad, &type->sat_cname,
			vals, id, opid,
			mask );

		if( rc ) return rc;
	}

	if( tags->bv_len ) {
		AttributeDescription *desc;

		mask = 0;

		desc = ad_find_tags( type, tags );
		if( desc ) {
			bdb_attr_mask( op->o_bd->be_private, desc, &mask );
		}

		if( mask ) {
			rc = indexer( op, txn, desc, &desc->ad_cname,
				vals, id, opid,
				mask );

			if( rc ) {
				return rc;
			}
		}
	}

	return LDAP_SUCCESS;
}

int bdb_index_values(
	Operation *op,
	DB_TXN *txn,
	AttributeDescription *desc,
	BerVarray vals,
	ID id,
	int opid )
{
	int rc;

	rc = index_at_values( op, txn, desc,
		desc->ad_type, &desc->ad_tags,
		vals, id, opid );

	return rc;
}

int
bdb_index_entry(
	Operation *op,
	DB_TXN *txn,
	int opid,
	Entry	*e )
{
	int rc;
	Attribute *ap = e->e_attrs;
#ifdef LDAP_COMP_MATCH
	ComponentReference *cr_list = NULL;
	ComponentReference *cr = NULL, *dupped_cr = NULL;
	void* decoded_comp, *extracted_comp;
	ComponentSyntaxInfo* csi_attr;
	Syntax* syn;
	AttributeType* at;
	int i, num_attr;
	void* mem_op;
	struct berval value = {0};
#endif

	Debug( LDAP_DEBUG_TRACE, "=> index_entry_%s( %ld, \"%s\" )\n",
		opid == SLAP_INDEX_ADD_OP ? "add" : "del",
		(long) e->e_id, e->e_dn );

	/* add each attribute to the indexes */
	for ( ; ap != NULL; ap = ap->a_next ) {
#ifdef LDAP_COMP_MATCH
		/* see if attribute has components to be indexed */
		bdb_attr_comp_ref( op->o_bd->be_private, ap->a_desc->ad_type->sat_ad, &cr_list );
		if ( attr_converter && cr_list ) {
			syn = ap->a_desc->ad_type->sat_syntax;
			ap->a_comp_data = op->o_tmpalloc( sizeof( ComponentData ), op->o_tmpmemctx );
                	/* Memory chunk(nibble) pre-allocation for decoders */
                	mem_op = nibble_mem_allocator ( 1024*16, 1024*4 );
			ap->a_comp_data->cd_mem_op = mem_op;
			for( cr = cr_list ; cr ; cr = cr->cr_next ) {
				/* count how many values in an attribute */
				for( num_attr=0; ap->a_vals[num_attr].bv_val != NULL; num_attr++ );
				num_attr++;
				cr->cr_nvals = (BerVarray)op->o_tmpalloc( sizeof( struct berval )*num_attr, op->o_tmpmemctx );
				for( i=0; ap->a_vals[i].bv_val != NULL; i++ ) {
					/* decoding attribute value */
					decoded_comp = attr_converter ( ap, syn, &ap->a_vals[i] );
					if ( !decoded_comp )
						return LDAP_DECODING_ERROR;
					/* extracting the referenced component */
					dupped_cr = dup_comp_ref( op, cr );
					csi_attr = ((ComponentSyntaxInfo*)decoded_comp)->csi_comp_desc->cd_extract_i( mem_op, dupped_cr, decoded_comp );
					if ( !csi_attr )
						return LDAP_DECODING_ERROR;
					cr->cr_asn_type_id = csi_attr->csi_comp_desc->cd_type_id;
					cr->cr_ad = (AttributeDescription*)get_component_description ( cr->cr_asn_type_id );
					if ( !cr->cr_ad )
						return LDAP_INVALID_SYNTAX;
					at = cr->cr_ad->ad_type;
					/* encoding the value of component in GSER */
					rc = component_encoder( mem_op, csi_attr, &value );
					if ( rc != LDAP_SUCCESS )
						return LDAP_ENCODING_ERROR;
					/* Normalize the encoded component values */
					if ( at->sat_equality && at->sat_equality->smr_normalize ) {
						rc = at->sat_equality->smr_normalize (
							SLAP_MR_VALUE_OF_ATTRIBUTE_SYNTAX,
							at->sat_syntax, at->sat_equality,
							&value, &cr->cr_nvals[i], op->o_tmpmemctx );
					} else {
						cr->cr_nvals[i] = value;
					}
				}
				/* The end of BerVarray */
				cr->cr_nvals[num_attr-1].bv_val = NULL;
				cr->cr_nvals[num_attr-1].bv_len = 0;
			}
			op->o_tmpfree( ap->a_comp_data, op->o_tmpmemctx );
			nibble_mem_free ( mem_op );
			ap->a_comp_data = NULL;
		}
#endif
		rc = bdb_index_values( op, txn, ap->a_desc,
			ap->a_nvals, e->e_id, opid );

		if( rc != LDAP_SUCCESS ) {
			Debug( LDAP_DEBUG_TRACE,
				"<= index_entry_%s( %ld, \"%s\" ) failure\n",
				opid == SLAP_INDEX_ADD_OP ? "add" : "del",
				(long) e->e_id, e->e_dn );
			return rc;
		}
	}

	Debug( LDAP_DEBUG_TRACE, "<= index_entry_%s( %ld, \"%s\" ) success\n",
		opid == SLAP_INDEX_ADD_OP ? "add" : "del",
		(long) e->e_id, e->e_dn );

	return LDAP_SUCCESS;
}