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/*
 *  Copyright (c) 2017 Otávio Santana and others
 *   All rights reserved. This program and the accompanying materials
 *   are made available under the terms of the Eclipse Public License v1.0
 *   and Apache License v2.0 which accompanies this distribution.
 *   The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
 *   and the Apache License v2.0 is available at http://www.opensource.org/licenses/apache2.0.php.
 *
 *   You may elect to redistribute this code under either of these licenses.
 *
 *   Contributors:
 *
 *   Otavio Santana
 */
package org.jnosql.artemis.graph.spi;

import org.apache.tinkerpop.gremlin.structure.Graph;
import org.jnosql.artemis.ConfigurationUnit;
import org.jnosql.artemis.DatabaseMetadata;
import org.jnosql.artemis.Databases;
import org.jnosql.artemis.Repository;
import org.jnosql.artemis.graph.query.RepositoryGraphBean;
import org.jnosql.artemis.util.ConfigurationUnitUtils;
import org.jnosql.artemis.util.RepositoryUnit;

import javax.enterprise.event.Observes;
import javax.enterprise.inject.spi.AfterBeanDiscovery;
import javax.enterprise.inject.spi.BeanManager;
import javax.enterprise.inject.spi.Extension;
import javax.enterprise.inject.spi.InjectionPoint;
import javax.enterprise.inject.spi.ProcessAnnotatedType;
import javax.enterprise.inject.spi.ProcessInjectionPoint;
import javax.enterprise.inject.spi.ProcessProducer;
import java.lang.reflect.Modifier;
import java.lang.reflect.Type;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashSet;
import java.util.Set;
import java.util.logging.Logger;

import static org.jnosql.artemis.DatabaseType.GRAPH;

/**
 * Extension to start up the GraphTemplate, Repository
 * from the {@link org.jnosql.artemis.Database} qualifier
 */
public class GraphProducerExtension implements Extension {

    private static final Logger LOGGER = Logger.getLogger(GraphProducerExtension.class.getName());

    private final Set databases = new HashSet<>();

    private final Collection> crudTypes = new HashSet<>();

    private final Collection repositoryUnits = new HashSet<>();

     void observes(@Observes final ProcessAnnotatedType repo) {
        Class javaClass = repo.getAnnotatedType().getJavaClass();
        if (Repository.class.equals(javaClass)) {
            return;
        }
        if (Arrays.asList(javaClass.getInterfaces()).contains(Repository.class)
                && Modifier.isInterface(javaClass.getModifiers())) {
            LOGGER.info("Adding a new Repository as discovered on Graph: " + javaClass);
            crudTypes.add(javaClass);
        }
    }


     void observes(@Observes final ProcessProducer pp) {
        Databases.addDatabase(pp, GRAPH, databases);
    }

    > void observes(@Observes ProcessInjectionPoint event) {

        InjectionPoint injectionPoint = event.getInjectionPoint();

        if (ConfigurationUnitUtils.hasConfigurationUnit(injectionPoint)) {

            ConfigurationUnit configurationUnit = ConfigurationUnitUtils.getConfigurationUnit(injectionPoint);
            Type type = injectionPoint.getType();
            RepositoryUnit unitRepository = RepositoryUnit.of((Class) type, configurationUnit);
            if (unitRepository.isGraph()) {
                LOGGER.info(String.format("Found Repository to configuration unit Graph to configuration name %s fileName %s database: %s repository: %s",
                        configurationUnit.name(), configurationUnit.fileName(), configurationUnit.database(), type.toString()));
                repositoryUnits.add(unitRepository);

            }
        }

    }

    void onAfterBeanDiscovery(@Observes final AfterBeanDiscovery afterBeanDiscovery, final BeanManager beanManager) {
        LOGGER.info(String.format("Starting to process on graphs: %d databases crud %d",
                databases.size(), crudTypes.size()));

        databases.forEach(type -> {
            final TemplateBean bean = new TemplateBean(beanManager, type.getProvider());
            afterBeanDiscovery.addBean(bean);
        });


        crudTypes.forEach(type -> {
            if (!databases.contains(DatabaseMetadata.DEFAULT_GRAPH)) {
                afterBeanDiscovery.addBean(new RepositoryGraphBean(type, beanManager, ""));
            }
            databases.forEach(database -> afterBeanDiscovery
                    .addBean(new RepositoryGraphBean(type, beanManager, database.getProvider())));
        });

        repositoryUnits.forEach(type -> afterBeanDiscovery.addBean(new RepositoryUnitGraphBean(beanManager, type)));

    }
}