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/*
 * Copyright 2019 the original author or authors.
 *
 * 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
 *
 *       https://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.quarkus.eureka;

import io.quarkus.eureka.client.EurekaClient;
import io.quarkus.eureka.client.InstanceInfo;
import io.quarkus.eureka.client.loadBalancer.LoadBalanced;
import io.quarkus.eureka.client.loadBalancer.LoadBalancer;
import io.quarkus.eureka.client.loadBalancer.LoadBalancerType;
import io.quarkus.eureka.client.loadBalancer.Random;
import io.quarkus.eureka.client.loadBalancer.RoundRobin;
import io.quarkus.eureka.config.ServiceLocationConfig;
import io.quarkus.eureka.operation.OperationFactory;
import io.quarkus.eureka.operation.remove.RemoveInstanceOperation;
import io.quarkus.eureka.util.ServiceDiscovery;
import io.quarkus.runtime.ShutdownEvent;

import javax.enterprise.context.ApplicationScoped;
import javax.enterprise.event.Observes;
import javax.enterprise.inject.Produces;
import javax.enterprise.inject.spi.InjectionPoint;
import javax.inject.Inject;

import java.util.logging.Logger;

import static io.quarkus.eureka.client.loadBalancer.LoadBalancerType.ROUND_ROBIN;

@ApplicationScoped
public class EurekaProducer {

    private final Logger logger = Logger.getLogger(this.getClass().getName());

    private OperationFactory operationFactory;

    private InstanceInfo instanceInfo;

    private ServiceLocationConfig serviceLocationConfig;

    @Produces
    @LoadBalanced
    EurekaClient eurekaClient(InjectionPoint injectionPoint) {
        ServiceDiscovery serviceDiscovery = new ServiceDiscovery(serviceLocationConfig, operationFactory);
        LoadBalancer loadBalancer = selectLoadBalancer(injectionPoint, serviceDiscovery);
        return new EurekaClient(loadBalancer);
    }

    private LoadBalancer selectLoadBalancer(final InjectionPoint injectionPoint,
        final ServiceDiscovery serviceDiscovery) {

        if (injectionPoint.getAnnotated().getAnnotation(LoadBalanced.class).type() == ROUND_ROBIN) {
            return new RoundRobin(serviceDiscovery);
        }
        return new Random(serviceDiscovery);
    }

    @Produces
    EurekaClient eurekaClient() {
        ServiceDiscovery serviceDiscovery = new ServiceDiscovery(serviceLocationConfig, operationFactory);
        return new EurekaClient(new Random(serviceDiscovery));
    }

    void onApplicationStop(@Observes ShutdownEvent shutdownEvent) {
        logger.info("application finished... now we have to deregister from Eureka...");
        String appId = instanceInfo.getApp();
        String instanceId = instanceInfo.getInstanceId();
        serviceLocationConfig.getLocations().forEach(location ->
            operationFactory.get(RemoveInstanceOperation.class).remove(location, appId, instanceId)
        );
    }

    void setInstanceInfo(final InstanceInfo instanceInfo) {
        this.instanceInfo = instanceInfo;
    }

    void setServiceLocationConfig(final ServiceLocationConfig serviceLocationConfig) {
        this.serviceLocationConfig = serviceLocationConfig;
    }

    void setOperationFactory(final OperationFactory operationFactory) {
        this.operationFactory = operationFactory;
    }
}