/*
 * Copyright 2016 Red Hat, Inc. and/or its affiliates
 * and other contributors as indicated by the @author tags.
 *
 * Licensed 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.keycloak.util.ldap;

import java.net.URL;
import java.util.Map;
import java.util.TreeSet;
import java.util.UUID;
import java.util.regex.Pattern;
import javax.naming.InvalidNameException;
import org.apache.directory.api.ldap.model.constants.SchemaConstants;
import org.apache.directory.api.ldap.model.entry.DefaultEntry;
import org.apache.directory.api.ldap.model.entry.Entry;
import org.apache.directory.api.ldap.model.ldif.LdifEntry;
import org.apache.directory.api.ldap.model.ldif.LdifReader;
import org.apache.directory.api.ldap.model.schema.SchemaManager;
import org.apache.directory.api.ldap.schemaextractor.impl.DefaultSchemaLdifExtractor;
import org.apache.directory.api.ldap.schemaextractor.impl.ResourceMap;
import org.apache.directory.server.core.api.interceptor.context.AddOperationContext;
import org.apache.directory.server.core.partition.ldif.AbstractLdifPartition;
import org.jboss.logging.Logger;

/**
 * In-memory schema-only partition which loads the data in the similar way as the
 * {@link org.apache.directory.api.ldap.schemaloader.JarLdifSchemaLoader}.
 *
 * @author Josef Cacek
 */
class InMemorySchemaPartition extends AbstractLdifPartition {

    private static final Logger log = Logger.getLogger(InMemorySchemaPartition.class);

    /**
     * Filesystem path separator pattern, either forward slash or backslash. java.util.regex.Pattern is immutable so only one
     * instance is needed for all uses.
     */
    public InMemorySchemaPartition(SchemaManager schemaManager) {
        super(schemaManager);
    }

    /**
     * Partition initialization - loads schema entries from the files on classpath.
     *
     * @see org.apache.directory.server.core.partition.impl.avl.AvlPartition#doInit()
     */
    @Override
    protected void doInit() throws InvalidNameException, Exception {
        if (initialized)
            return;
        log.debug("Initializing schema partition " + getId());
        suffixDn.apply(schemaManager);
        super.doInit();

        // load schema
        final Map<String, Boolean> resMap = ResourceMap.getResources(Pattern.compile("schema[/\\Q\\\\E]ou=schema.*"));
        for (String resourcePath : new TreeSet<String>(resMap.keySet())) {
            if (resourcePath.endsWith(".ldif")) {
                URL resource = DefaultSchemaLdifExtractor.getUniqueResource(resourcePath, "Schema LDIF file");
                LdifReader reader = new LdifReader(resource.openStream());
                LdifEntry ldifEntry = reader.next();
                reader.close();
                Entry entry = new DefaultEntry(schemaManager, ldifEntry.getEntry());

                // add mandatory attributes
                if (entry.get(SchemaConstants.ENTRY_CSN_AT) == null) {
                    entry.add(SchemaConstants.ENTRY_CSN_AT, AbstractLdifPartition.defaultCSNFactory.newInstance().toString());
                }
                if (entry.get(SchemaConstants.ENTRY_UUID_AT) == null) {
                    entry.add(SchemaConstants.ENTRY_UUID_AT, UUID.randomUUID().toString());
                }
                AddOperationContext addContext = new AddOperationContext(null, entry);
                super.add(addContext);
            }
        }
    }

}
