/*
 * 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.syncope.core.persistence.neo4j.dao.repo;

import java.util.List;
import java.util.Optional;
import javax.cache.Cache;
import org.apache.syncope.core.persistence.api.dao.AnyTypeDAO;
import org.apache.syncope.core.persistence.api.dao.DerSchemaDAO;
import org.apache.syncope.core.persistence.api.dao.ExternalResourceDAO;
import org.apache.syncope.core.persistence.api.dao.GroupDAO;
import org.apache.syncope.core.persistence.api.dao.PlainSchemaDAO;
import org.apache.syncope.core.persistence.api.dao.RelationshipTypeDAO;
import org.apache.syncope.core.persistence.api.entity.AnyType;
import org.apache.syncope.core.persistence.api.entity.AnyTypeClass;
import org.apache.syncope.core.persistence.api.entity.DerSchema;
import org.apache.syncope.core.persistence.api.entity.PlainSchema;
import org.apache.syncope.core.persistence.api.entity.RelationshipTypeExtension;
import org.apache.syncope.core.persistence.api.entity.group.GroupTypeExtension;
import org.apache.syncope.core.persistence.neo4j.dao.AbstractDAO;
import org.apache.syncope.core.persistence.neo4j.entity.EntityCacheKey;
import org.apache.syncope.core.persistence.neo4j.entity.Neo4jAnyType;
import org.apache.syncope.core.persistence.neo4j.entity.Neo4jAnyTypeClass;
import org.apache.syncope.core.persistence.neo4j.entity.Neo4jDerSchema;
import org.apache.syncope.core.persistence.neo4j.entity.Neo4jExternalResource;
import org.apache.syncope.core.persistence.neo4j.entity.Neo4jPlainSchema;
import org.apache.syncope.core.persistence.neo4j.entity.group.Neo4jGroup;
import org.apache.syncope.core.persistence.neo4j.spring.NodeValidator;
import org.springframework.data.neo4j.core.Neo4jClient;
import org.springframework.data.neo4j.core.Neo4jTemplate;
import org.springframework.transaction.annotation.Transactional;

public class AnyTypeClassRepoExtImpl extends AbstractDAO implements AnyTypeClassRepoExt {

    protected final AnyTypeDAO anyTypeDAO;

    protected final PlainSchemaDAO plainSchemaDAO;

    protected final DerSchemaDAO derSchemaDAO;

    protected final GroupDAO groupDAO;

    protected final RelationshipTypeDAO relationshipTypeDAO;

    protected final ExternalResourceDAO resourceDAO;

    protected final NodeValidator nodeValidator;

    protected final Cache<EntityCacheKey, Neo4jAnyType> anyTypeCache;

    protected final Cache<EntityCacheKey, Neo4jExternalResource> resourceCache;

    protected final Cache<EntityCacheKey, Neo4jGroup> groupCache;

    public AnyTypeClassRepoExtImpl(
            final AnyTypeDAO anyTypeDAO,
            final PlainSchemaDAO plainSchemaDAO,
            final DerSchemaDAO derSchemaDAO,
            final GroupDAO groupDAO,
            final RelationshipTypeDAO relationshipTypeDAO,
            final ExternalResourceDAO resourceDAO,
            final Neo4jTemplate neo4jTemplate,
            final Neo4jClient neo4jClient,
            final NodeValidator nodeValidator,
            final Cache<EntityCacheKey, Neo4jAnyType> anyTypeCache,
            final Cache<EntityCacheKey, Neo4jExternalResource> resourceCache,
            final Cache<EntityCacheKey, Neo4jGroup> groupCache) {

        super(neo4jTemplate, neo4jClient);

        this.anyTypeDAO = anyTypeDAO;
        this.plainSchemaDAO = plainSchemaDAO;
        this.derSchemaDAO = derSchemaDAO;
        this.groupDAO = groupDAO;
        this.relationshipTypeDAO = relationshipTypeDAO;
        this.resourceDAO = resourceDAO;
        this.nodeValidator = nodeValidator;
        this.anyTypeCache = anyTypeCache;
        this.resourceCache = resourceCache;
        this.groupCache = groupCache;
    }

    @Transactional(readOnly = true)
    @Override
    public Optional<? extends AnyTypeClass> findById(final String key) {
        return neo4jTemplate.findById(key, Neo4jAnyTypeClass.class);
    }

    @Override
    public AnyTypeClass save(final AnyTypeClass anyTypeClass) {
        // unlink any schema that was unlinked from anyTypeClass
        neo4jTemplate.findById(anyTypeClass.getKey(), Neo4jAnyTypeClass.class).ifPresent(before -> {
            before.getPlainSchemas().stream().filter(schema -> !anyTypeClass.getPlainSchemas().contains(schema)).
                    forEach(schema -> deleteRelationship(
                    Neo4jPlainSchema.NODE,
                    Neo4jAnyTypeClass.NODE,
                    schema.getKey(),
                    anyTypeClass.getKey(),
                    Neo4jAnyTypeClass.ANY_TYPE_CLASS_PLAIN_REL));
            before.getDerSchemas().stream().filter(schema -> !anyTypeClass.getDerSchemas().contains(schema)).
                    forEach(schema -> deleteRelationship(
                    Neo4jDerSchema.NODE,
                    Neo4jAnyTypeClass.NODE,
                    schema.getKey(),
                    anyTypeClass.getKey(),
                    Neo4jAnyTypeClass.ANY_TYPE_CLASS_DER_REL));
        });

        AnyTypeClass merged = neo4jTemplate.save(nodeValidator.validate(anyTypeClass));

        for (PlainSchema schema : merged.getPlainSchemas()) {
            schema.setAnyTypeClass(merged);
            plainSchemaDAO.save(schema);
        }
        for (DerSchema schema : merged.getDerSchemas()) {
            schema.setAnyTypeClass(merged);
            derSchemaDAO.save(schema);
        }

        for (AnyType anyType : anyTypeDAO.findByClassesContaining(merged)) {
            anyType.getClasses().removeIf(c -> c.getKey().equals(merged.getKey()));
            anyType.add(merged);

            anyTypeCache.put(EntityCacheKey.of(anyType.getKey()), (Neo4jAnyType) anyType);
        }

        return merged;
    }

    @Override
    public void deleteById(final String key) {
        AnyTypeClass anyTypeClass = findById(key).orElse(null);
        if (anyTypeClass == null) {
            return;
        }

        for (PlainSchema schema : plainSchemaDAO.findByAnyTypeClasses(List.of(anyTypeClass))) {
            schema.setAnyTypeClass(null);
            plainSchemaDAO.save(schema);
        }
        for (DerSchema schema : derSchemaDAO.findByAnyTypeClasses(List.of(anyTypeClass))) {
            schema.setAnyTypeClass(null);
            derSchemaDAO.save(schema);
        }

        for (AnyType anyType : anyTypeDAO.findByClassesContaining(anyTypeClass)) {
            anyType.getClasses().remove(anyTypeClass);

            Optional.of(anyTypeCache.get(EntityCacheKey.of(anyType.getKey()))).
                    ifPresent(cached -> cached.getClasses().remove(anyTypeClass));
        }

        for (GroupTypeExtension typeExt : groupDAO.findTypeExtensions(anyTypeClass)) {
            typeExt.getAuxClasses().remove(anyTypeClass);

            if (typeExt.getAuxClasses().isEmpty()) {
                groupCache.remove(EntityCacheKey.of(typeExt.getGroup().getKey()));

                typeExt.getGroup().getTypeExtensions().remove(typeExt);
                typeExt.setGroup(null);
            }
        }
        for (RelationshipTypeExtension typeExt : relationshipTypeDAO.findTypeExtensions(anyTypeClass)) {
            typeExt.getAuxClasses().remove(anyTypeClass);

            if (typeExt.getAuxClasses().isEmpty()) {
                typeExt.getRelationshipType().getTypeExtensions().remove(typeExt);
                typeExt.setRelationshipType(null);
            }
        }

        resourceDAO.findAll().stream().filter(resource -> resource.getProvisions().stream().
                anyMatch(provision -> provision.getAuxClasses().contains(anyTypeClass.getKey()))).
                forEach(resource -> {
                    resource.getProvisions().stream().
                            filter(provision -> provision.getAuxClasses().contains(anyTypeClass.getKey())).
                            forEach(provision -> provision.getAuxClasses().remove(anyTypeClass.getKey()));

                    resourceCache.put(EntityCacheKey.of(resource.getKey()), (Neo4jExternalResource) resource);
                });

        neo4jTemplate.deleteById(key, Neo4jAnyTypeClass.class);
    }
}
