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/**
 * Copyright (C) 2015 The Gravitee team (http://gravitee.io)
 *
 * 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 io.gravitee.node.notifier;

import static io.gravitee.node.notifier.NotifierUtils.buildNotificationId;
import static io.gravitee.node.notifier.NotifierUtils.buildResourceKey;

import com.google.common.collect.Maps;
import io.gravitee.node.api.configuration.Configuration;
import io.gravitee.node.api.notifier.*;
import io.gravitee.node.notifier.plugin.NotifierPluginFactory;
import io.gravitee.node.notifier.trigger.NotificationTrigger;
import io.reactivex.rxjava3.core.Completable;
import io.vertx.core.Vertx;
import java.util.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Lazy;
import org.springframework.stereotype.Component;

/**
 * @author Eric LELEU (eric.leleu at graviteesource.com)
 * @author GraviteeSource Team
 */
@Component
public class NotifierServiceImpl implements NotifierService {

    private final Logger logger = LoggerFactory.getLogger(NotifierServiceImpl.class);

    @Autowired
    private Vertx vertx;

    @Autowired
    private NotifierPluginFactory notifierFactory;

    @Autowired
    @Lazy
    private NotificationAcknowledgeRepository notificationAcknowledgeRepository;

    @Autowired
    private Configuration configuration;

    private final Map triggers = Maps.newConcurrentMap();

    private final Map> definitions = Maps.newConcurrentMap();

    @Override
    public void register(NotificationDefinition definition, NotificationCondition condition, ResendNotificationCondition resendCondition) {
        if (enabled()) {
            final var notificationTrigger = getTrigger(definition, condition, resendCondition);
            final String id = buildNotificationId(
                definition.getResourceId(),
                definition.getResourceType(),
                definition.getType(),
                definition.getAudienceId()
            );
            triggers.put(id, notificationTrigger);
            preserveNotificationDefinition(definition);

            notificationTrigger.start();
        } else {
            logger.debug("Node notifier service disabled");
        }
    }

    private void preserveNotificationDefinition(NotificationDefinition definition) {
        final String resourceKey = buildResourceKey(definition.getResourceId(), definition.getResourceType());
        definitions.computeIfAbsent(resourceKey, key -> Collections.synchronizedList(new ArrayList<>())).add(definition);
    }

    @Override
    public void unregisterAll(String resourceId, String resourceType) {
        final String resourceKey = buildResourceKey(resourceId, resourceType);
        List defs = definitions.get(resourceKey);
        if (defs != null) {
            defs.forEach(def -> {
                final String id = buildNotificationId(def.getResourceId(), def.getResourceType(), def.getType(), def.getAudienceId());
                stopAndRemoveTrigger(id);
            });
            definitions.remove(resourceKey);
        }
    }

    @Override
    public void unregister(String resourceId, String resourceType, String type, String audienceId) {
        final String id = buildNotificationId(resourceId, resourceType, type, audienceId);
        stopAndRemoveTrigger(id);

        removeDefinition(resourceId, resourceType, type, audienceId);
    }

    private void stopAndRemoveTrigger(String id) {
        Optional
            .ofNullable(triggers.get(id))
            .ifPresent(trigger -> {
                trigger.stop();
                triggers.remove(id);
            });
    }

    private void removeDefinition(String resourceId, String resourceType, String type, String audienceId) {
        final NotificationDefinition definitionToDelete = new NotificationDefinition();
        definitionToDelete.setResourceType(resourceType);
        definitionToDelete.setResourceId(resourceId);
        definitionToDelete.setAudienceId(audienceId);
        definitionToDelete.setType(type);
        final String resourceKey = buildResourceKey(resourceId, resourceType);
        if (definitions.containsKey(resourceKey)) {
            definitions.get(resourceKey).remove(definitionToDelete);
        }
    }

    @Override
    public Completable deleteAcknowledge(String resourceId, String resourceType) {
        return this.notificationAcknowledgeRepository.deleteByResourceId(resourceId, resourceType);
    }

    private NotificationTrigger getTrigger(
        NotificationDefinition definition,
        NotificationCondition condition,
        ResendNotificationCondition resendCondition
    ) {
        NotificationTrigger trigger = new NotificationTrigger(
            vertx,
            notificationAcknowledgeRepository,
            notifierFactory,
            definition,
            condition,
            resendCondition,
            this.tryAvoidDuplicateNotification()
        );
        return trigger;
    }

    private boolean enabled() {
        return configuration.getProperty("services.notifier.enabled", Boolean.class, false);
    }

    private boolean tryAvoidDuplicateNotification() {
        return configuration.getProperty("services.notifier.tryAvoidDuplicateNotification", Boolean.class, false);
    }
}