/*
 * 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.jpa.dao;

import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;
import javax.persistence.TypedQuery;
import org.apache.syncope.common.lib.types.IdMEntitlement;
import org.apache.syncope.core.persistence.api.dao.ConnInstanceDAO;
import org.apache.syncope.core.persistence.api.dao.ConnInstanceHistoryConfDAO;
import org.apache.syncope.core.persistence.api.dao.ExternalResourceDAO;
import org.apache.syncope.core.persistence.api.dao.NotFoundException;
import org.apache.syncope.core.persistence.api.entity.Entity;
import org.apache.syncope.core.persistence.api.entity.ConnInstance;
import org.apache.syncope.core.persistence.jpa.entity.JPAConnInstance;
import org.apache.syncope.core.provisioning.api.ConnectorRegistry;
import org.apache.syncope.core.spring.security.AuthContextUtils;
import org.apache.syncope.core.spring.security.DelegatedAdministrationException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Lazy;
import org.springframework.stereotype.Repository;

@Repository
public class JPAConnInstanceDAO extends AbstractDAO<ConnInstance> implements ConnInstanceDAO {

    @Autowired
    private ConnInstanceHistoryConfDAO connInstanceHistoryConfDAO;

    @Autowired
    @Lazy
    private ExternalResourceDAO resourceDAO;

    @Autowired
    private ConnectorRegistry connRegistry;

    @Override
    public ConnInstance find(final String key) {
        return entityManager().find(JPAConnInstance.class, key);
    }

    @Override
    public ConnInstance authFind(final String key) {
        ConnInstance connInstance = find(key);
        if (connInstance == null) {
            return null;
        }

        Set<String> authRealms = AuthContextUtils.getAuthorizations().get(IdMEntitlement.CONNECTOR_READ);
        if (authRealms == null || authRealms.isEmpty()
                || !authRealms.stream().anyMatch(
                        realm -> connInstance.getAdminRealm().getFullPath().startsWith(realm))) {

            throw new DelegatedAdministrationException(
                    connInstance.getAdminRealm().getFullPath(),
                    ConnInstance.class.getSimpleName(),
                    connInstance.getKey());
        }

        return connInstance;
    }

    @Override
    public List<ConnInstance> findAll() {
        final Set<String> authRealms = AuthContextUtils.getAuthorizations().get(IdMEntitlement.CONNECTOR_LIST);
        if (authRealms == null || authRealms.isEmpty()) {
            return List.of();
        }

        TypedQuery<ConnInstance> query = entityManager().createQuery(
                "SELECT e FROM " + JPAConnInstance.class.getSimpleName() + " e", ConnInstance.class);

        return query.getResultList().stream().filter(connInstance -> authRealms.stream().
                anyMatch(realm -> connInstance.getAdminRealm().getFullPath().startsWith(realm))).
                collect(Collectors.toList());
    }

    @Override
    public ConnInstance save(final ConnInstance connector) {
        final ConnInstance merged = entityManager().merge(connector);

        merged.getResources().forEach(resource -> {
            try {
                connRegistry.registerConnector(resource);
            } catch (NotFoundException e) {
                LOG.error("While registering connector for resource", e);
            }
        });

        return merged;
    }

    @Override
    public void delete(final String key) {
        ConnInstance connInstance = find(key);
        if (connInstance == null) {
            return;
        }

        connInstance.getResources().stream().
                map(Entity::getKey).collect(Collectors.toList()).
                forEach(resource -> resourceDAO.delete(resource));

        connInstanceHistoryConfDAO.deleteByEntity(connInstance);

        entityManager().remove(connInstance);

        connRegistry.unregisterConnector(key);
    }
}