/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *  
 *    http://www.apache.org/licenses/LICENSE-2.0
 *  
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License. 
 *  
 */
package org.apache.directory.server.core.schema; 


import java.util.List;

import org.apache.directory.server.i18n.I18n;
import org.apache.directory.shared.ldap.model.constants.MetaSchemaConstants;
import org.apache.directory.shared.ldap.model.constants.SchemaConstants;
import org.apache.directory.shared.ldap.model.entry.DefaultEntry;
import org.apache.directory.shared.ldap.model.entry.DefaultEntryAttribute;
import org.apache.directory.shared.ldap.model.entry.EntryAttribute;
import org.apache.directory.shared.ldap.model.entry.Entry;
import org.apache.directory.shared.ldap.model.exception.LdapException;
import org.apache.directory.shared.ldap.model.schema.AttributeType;
import org.apache.directory.shared.ldap.model.schema.DITContentRule;
import org.apache.directory.shared.ldap.model.schema.DITStructureRule;
import org.apache.directory.shared.ldap.model.schema.AbstractLdapComparator;
import org.apache.directory.shared.ldap.model.schema.LdapSyntax;
import org.apache.directory.shared.ldap.model.schema.MatchingRule;
import org.apache.directory.shared.ldap.model.schema.MutableLdapSyntaxImpl;
import org.apache.directory.shared.ldap.model.schema.MutableMatchingRuleImpl;
import org.apache.directory.shared.ldap.model.schema.MatchingRuleUse;
import org.apache.directory.shared.ldap.model.schema.NameForm;
import org.apache.directory.shared.ldap.model.schema.AbstractNormalizer;
import org.apache.directory.shared.ldap.model.schema.ObjectClass;
import org.apache.directory.shared.ldap.model.schema.SchemaManager;
import org.apache.directory.shared.ldap.model.schema.MutableSchemaObject;
import org.apache.directory.shared.ldap.model.schema.SchemaObject;
import org.apache.directory.shared.ldap.model.schema.AbstractSyntaxChecker;
import org.apache.directory.shared.ldap.model.schema.registries.Schema;
import org.apache.directory.shared.util.DateUtils;


/**
 * A factory that generates an entry using the meta schema for schema 
 * elements.
 *
 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
 */
public class AttributesFactory
{
    public Entry getAttributes( MutableSchemaObject obj, Schema schema, SchemaManager schemaManager ) throws LdapException
    {
        if ( obj instanceof LdapSyntax )
        {
            return getAttributes( ( MutableLdapSyntaxImpl ) obj, schema, schemaManager );
        }
        else if ( obj instanceof MatchingRule )
        {
            return getAttributes( ( MutableMatchingRuleImpl ) obj, schema, schemaManager );
        }
        else if ( obj instanceof AttributeType )
        {
            return getAttributes( ( AttributeType ) obj, schema, schemaManager );
        }
        else if ( obj instanceof ObjectClass )
        {
            return getAttributes( ( ObjectClass ) obj, schema, schemaManager );
        }
        else if ( obj instanceof MatchingRuleUse )
        {
            return getAttributes( ( MatchingRuleUse ) obj, schema, schemaManager );
        }
        else if ( obj instanceof DITStructureRule )
        {
            return getAttributes( ( DITStructureRule ) obj, schema, schemaManager );
        }
        else if ( obj instanceof DITContentRule )
        {
            return getAttributes( ( DITContentRule ) obj, schema, schemaManager );
        }
        else if ( obj instanceof NameForm )
        {
            return getAttributes( ( NameForm ) obj, schema, schemaManager );
        }
        
        throw new IllegalArgumentException( I18n.err( I18n.ERR_698, obj.getClass() ) );
    }
    
    
    public Entry getAttributes( Schema schema, SchemaManager schemaManager ) throws LdapException
    {
        Entry entry = new DefaultEntry( schemaManager );

        entry.put( SchemaConstants.OBJECT_CLASS_AT, SchemaConstants.TOP_OC, MetaSchemaConstants.META_SCHEMA_OC );
        entry.put( SchemaConstants.CN_AT, schema.getSchemaName() );
        entry.put( SchemaConstants.CREATORS_NAME_AT, schema.getOwner() );
        entry.put( SchemaConstants.CREATE_TIMESTAMP_AT, DateUtils.getGeneralizedTime() );
        
        if ( schema.isDisabled() )
        {
            entry.put( MetaSchemaConstants.M_DISABLED_AT, "TRUE" );
        }
        
        String[] dependencies = schema.getDependencies();
        
        if ( dependencies != null && dependencies.length > 0 )
        {
            EntryAttribute attr = new DefaultEntryAttribute( schemaManager.getAttributeType( MetaSchemaConstants.M_DEPENDENCIES_AT ) );
            
            for ( String dependency:dependencies )
            {
                attr.add( dependency );
            }
            
            entry.put( attr );
        }
        
        return entry;
    }
    
    
    public Entry getAttributes( AbstractSyntaxChecker syntaxChecker, Schema schema, SchemaManager schemaManager )
    {
        Entry entry = new DefaultEntry( schemaManager );

        entry.put( SchemaConstants.OBJECT_CLASS_AT, SchemaConstants.TOP_OC, MetaSchemaConstants.META_SYNTAX_CHECKER_OC );
        entry.put( MetaSchemaConstants.M_OID_AT, syntaxChecker.getOid() );
        entry.put( MetaSchemaConstants.M_FQCN_AT, syntaxChecker.getClass().getName() );
        entry.put( SchemaConstants.CREATORS_NAME_AT, schema.getOwner() );
        entry.put( SchemaConstants.CREATE_TIMESTAMP_AT, DateUtils.getGeneralizedTime() );
        
        return entry;
    }

    
    public Entry getAttributes( MutableLdapSyntaxImpl syntax, Schema schema, SchemaManager schemaManager ) throws LdapException
    {
        Entry entry = new DefaultEntry( schemaManager );

        entry.put( SchemaConstants.OBJECT_CLASS_AT, SchemaConstants.TOP_OC, MetaSchemaConstants.META_SYNTAX_OC );
        entry.put( MetaSchemaConstants.X_HUMAN_READABLE_AT, getBoolean( syntax.isHumanReadable() ) );
        entry.put( SchemaConstants.CREATORS_NAME_AT, schema.getOwner() );
        entry.put( SchemaConstants.CREATE_TIMESTAMP_AT, DateUtils.getGeneralizedTime() );
        injectCommon( syntax, entry, schemaManager );
        
        return entry;
    }

    
    public Entry getAttributes( String oid, AbstractNormalizer normalizer, Schema schema, SchemaManager schemaManager )
    {
        Entry entry = new DefaultEntry( schemaManager );

        entry.put( SchemaConstants.OBJECT_CLASS_AT, SchemaConstants.TOP_OC, MetaSchemaConstants.META_NORMALIZER_OC );
        entry.put( MetaSchemaConstants.M_OID_AT, oid );
        entry.put( MetaSchemaConstants.M_FQCN_AT, normalizer.getClass().getName() );
        entry.put( SchemaConstants.CREATORS_NAME_AT, schema.getOwner() );
        entry.put( SchemaConstants.CREATE_TIMESTAMP_AT, DateUtils.getGeneralizedTime() );
        return entry;
    }

    
    public Entry getAttributes( String oid, AbstractLdapComparator<? super Object> comparator, Schema schema, SchemaManager schemaManager )
    {
        Entry entry = new DefaultEntry( schemaManager );

        entry.put( SchemaConstants.OBJECT_CLASS_AT, SchemaConstants.TOP_OC, MetaSchemaConstants.META_COMPARATOR_OC );
        entry.put( MetaSchemaConstants.M_OID_AT, oid );
        entry.put( MetaSchemaConstants.M_FQCN_AT, comparator.getClass().getName() );
        entry.put( SchemaConstants.CREATORS_NAME_AT, schema.getOwner() );
        entry.put( SchemaConstants.CREATE_TIMESTAMP_AT, DateUtils.getGeneralizedTime() );
        return entry;
    }


    /**
     * 
     * @param matchingRule
     * @return Attributes
     * @throws LdapException
     */
    public Entry getAttributes( MutableMatchingRuleImpl matchingRule, Schema schema, SchemaManager schemaManager ) throws LdapException
    {
        Entry entry = new DefaultEntry( schemaManager );

        entry.put( SchemaConstants.OBJECT_CLASS_AT, SchemaConstants.TOP_OC, MetaSchemaConstants.META_MATCHING_RULE_OC );
        entry.put( MetaSchemaConstants.M_SYNTAX_AT, matchingRule.getSyntaxOid() );
        entry.put( SchemaConstants.CREATORS_NAME_AT, schema.getOwner() );
        entry.put( SchemaConstants.CREATE_TIMESTAMP_AT, DateUtils.getGeneralizedTime() );
        injectCommon( matchingRule, entry, schemaManager );
        return entry;
    }

    
    public Entry getAttributes( MatchingRuleUse matchingRuleUse, Schema schema, SchemaManager schemaManager )
    {
        Entry entry = new DefaultEntry( schemaManager );

        entry.put( SchemaConstants.OBJECT_CLASS_AT, SchemaConstants.TOP_OC, "" );
        entry.put( SchemaConstants.CREATORS_NAME_AT, schema.getOwner() );
        entry.put( SchemaConstants.CREATE_TIMESTAMP_AT, DateUtils.getGeneralizedTime() );
        return entry;
    }

    
    public Entry getAttributes( DITStructureRule dITStructureRule, Schema schema, SchemaManager schemaManager )
    {
        Entry entry = new DefaultEntry( schemaManager );

        entry.put( SchemaConstants.OBJECT_CLASS_AT, SchemaConstants.TOP_OC, "" );
        entry.put( SchemaConstants.CREATORS_NAME_AT, schema.getOwner() );
        entry.put( SchemaConstants.CREATE_TIMESTAMP_AT, DateUtils.getGeneralizedTime() );
        return entry;
    }

    
    public Entry getAttributes( DITContentRule dITContentRule, Schema schema, SchemaManager schemaManager )
    {
        Entry entry = new DefaultEntry( schemaManager );

        entry.put( SchemaConstants.OBJECT_CLASS_AT, SchemaConstants.TOP_OC, "" );
        entry.put( SchemaConstants.CREATORS_NAME_AT, schema.getOwner() );
        entry.put( SchemaConstants.CREATE_TIMESTAMP_AT, DateUtils.getGeneralizedTime() );
        return entry;
    }

    
    public Entry getAttributes( NameForm nameForm, Schema schema, SchemaManager schemaManager )
    {
        Entry entry = new DefaultEntry( schemaManager );

        entry.put( SchemaConstants.OBJECT_CLASS_AT, SchemaConstants.TOP_OC, "" );
        entry.put( SchemaConstants.CREATORS_NAME_AT, schema.getOwner() );
        entry.put( SchemaConstants.CREATE_TIMESTAMP_AT, DateUtils.getGeneralizedTime() );
        return entry;
    }


    /**
     * <pre>
     *    objectclass ( 1.3.6.1.4.1.18060.0.4.0.3.3
     *       NAME 'metaAttributeType'
     *       DESC 'meta definition of the AttributeType object'
     *       SUP metaTop
     *       STRUCTURAL
     *       MUST ( m-name $ m-syntax )
     *       MAY ( m-supAttributeType $ m-obsolete $ m-equality $ m-ordering $ 
     *             m-substr $ m-singleValue $ m-collective $ m-noUserModification $ 
     *             m-usage $ m-extensionAttributeType )
     *    )
     * </pre>
     * 
     * @param attributeType
     * @return Attributes
     * @throws LdapException
     */
    public Entry getAttributes( AttributeType attributeType, Schema schema, SchemaManager schemaManager ) throws LdapException
    {
        Entry entry = new DefaultEntry( schemaManager );

        entry.put( SchemaConstants.OBJECT_CLASS_AT, SchemaConstants.TOP_OC, MetaSchemaConstants.META_ATTRIBUTE_TYPE_OC );
        entry.put( MetaSchemaConstants.M_SYNTAX_AT, attributeType.getSyntaxOid() );
        entry.put( MetaSchemaConstants.M_COLLECTIVE_AT, getBoolean( attributeType.isCollective() ) );
        entry.put( MetaSchemaConstants.M_NO_USER_MODIFICATION_AT, getBoolean( ! attributeType.isUserModifiable() ) );
        entry.put( MetaSchemaConstants.M_SINGLE_VALUE_AT, getBoolean( attributeType.isSingleValued() ) );
        entry.put( MetaSchemaConstants.M_USAGE_AT, attributeType.getUsage().toString() );
        entry.put( SchemaConstants.CREATORS_NAME_AT, schema.getOwner() );
        entry.put( SchemaConstants.CREATE_TIMESTAMP_AT, DateUtils.getGeneralizedTime() );

        injectCommon( attributeType, entry, schemaManager );
        
        String superiorOid = attributeType.getSuperiorOid();
        
        if ( superiorOid != null )
        {
            entry.put( MetaSchemaConstants.M_SUP_ATTRIBUTE_TYPE_AT, superiorOid );
        }
        
        if ( attributeType.getEqualityOid() != null )
        {
            entry.put( MetaSchemaConstants.M_EQUALITY_AT, attributeType.getEqualityOid() );
        }

        if ( attributeType.getSubstringOid() != null )
        {
            entry.put( MetaSchemaConstants.M_SUBSTR_AT, attributeType.getSubstringOid() );
        }

        if ( attributeType.getOrderingOid() != null )
        {
            entry.put( MetaSchemaConstants.M_ORDERING_AT, attributeType.getOrderingOid() );
        }

        return entry;
    }

    
    /**
     * Creates the attributes of an entry representing an objectClass.
     * 
     * <pre>
     *  objectclass ( 1.3.6.1.4.1.18060.0.4.0.3.2
     *      NAME 'metaObjectClass'
     *      DESC 'meta definition of the objectclass object'
     *      SUP metaTop
     *      STRUCTURAL
     *      MUST m-oid
     *      MAY ( m-name $ m-obsolete $ m-supObjectClass $ m-typeObjectClass $ m-must $ 
     *            m-may $ m-extensionObjectClass )
     *  )
     * </pre>
     * 
     * @param objectClass the objectClass to produce a meta schema entry for
     * @return the attributes of the metaSchema entry representing the objectClass
     * @throws LdapException if there are any problems
     */
    public Entry getAttributes( ObjectClass objectClass, Schema schema, SchemaManager schemaManager ) throws LdapException
    {
        Entry entry = new DefaultEntry( schemaManager );

        entry.put( SchemaConstants.OBJECT_CLASS_AT, SchemaConstants.TOP_OC, MetaSchemaConstants.META_OBJECT_CLASS_OC );
        entry.put( MetaSchemaConstants.M_TYPE_OBJECT_CLASS_AT, objectClass.getType().toString() );
        entry.put( SchemaConstants.CREATORS_NAME_AT, schema.getOwner() );
        entry.put( SchemaConstants.CREATE_TIMESTAMP_AT, DateUtils.getGeneralizedTime() );
        
        injectCommon( objectClass, entry, schemaManager );

        // handle the superior objectClasses 
        if ( objectClass.getSuperiorOids() != null && objectClass.getSuperiorOids().size() != 0 )
        {
            EntryAttribute attr = new DefaultEntryAttribute( schemaManager.getAttributeType( MetaSchemaConstants.M_SUP_OBJECT_CLASS_AT ) );
            
            for ( String superior:objectClass.getSuperiorOids() )
            {
                attr.add( superior ); 
            }
            
            entry.put( attr );
        }

        // add the must list
        if ( objectClass.getMustAttributeTypeOids() != null && objectClass.getMustAttributeTypeOids().size() != 0 )
        {
            EntryAttribute attr = new DefaultEntryAttribute( schemaManager.getAttributeType( MetaSchemaConstants.M_MUST_AT ) );

            for ( String mustOid :objectClass.getMustAttributeTypeOids() )
            {
                attr.add( mustOid );
            }
            
            entry.put( attr );
        }
        
        // add the may list
        if ( objectClass.getMayAttributeTypeOids() != null && objectClass.getMayAttributeTypeOids().size() != 0 )
        {
            EntryAttribute attr = new DefaultEntryAttribute( schemaManager.getAttributeType( MetaSchemaConstants.M_MAY_AT ) );

            for ( String mayOid :objectClass.getMayAttributeTypeOids() )
            {
                attr.add( mayOid );
            }
            
            entry.put( attr );
        }
        
        return entry;
    }
    
    
    private final void injectCommon( SchemaObject object, Entry entry, SchemaManager schemaManager ) throws LdapException
    {
        injectNames( object.getNames(), entry, schemaManager );
        entry.put( MetaSchemaConstants.M_OBSOLETE_AT, getBoolean( object.isObsolete() ) );
        entry.put( MetaSchemaConstants.M_OID_AT, object.getOid() );
        
        if ( object.getDescription() != null )
        {
            entry.put( MetaSchemaConstants.M_DESCRIPTION_AT, object.getDescription() );
        }
    }
    
    
    private final void injectNames( List<String> names, Entry entry, SchemaManager schemaManager ) throws LdapException
    {
        if ( ( names == null ) || ( names.size() == 0 ) )
        {
            return;
        }
        
        EntryAttribute attr = new DefaultEntryAttribute( schemaManager.getAttributeType( MetaSchemaConstants.M_NAME_AT ) );

        for ( String name:names )
        {
            attr.add( name );
        }
        
        entry.put( attr );
    }

    
    private final String getBoolean( boolean value )
    {
        if ( value ) 
        {
            return "TRUE";
        }
        else
        {
            return "FALSE";
        }
    }
}