/*
 * Copyright 2022 Red Hat, Inc. and/or its affiliates.
 *
 * 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 org.kie.kogito.addons.quarkus.k8s.discovery;

import java.net.URI;
import java.util.Optional;

import javax.enterprise.context.ApplicationScoped;
import javax.inject.Inject;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import io.fabric8.knative.client.KnativeClient;
import io.fabric8.knative.serving.v1.Service;

@ApplicationScoped
public class KnativeServiceDiscovery extends AbstractResourceDiscovery {

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

    private final KnativeClient knativeClient;

    @Inject
    public KnativeServiceDiscovery(KnativeClient knativeClient) {
        this.knativeClient = knativeClient;
    }

    public Optional<URI> query(KnativeServiceUri knativeServiceUri) {
        logConnection(knativeClient, knativeServiceUri.getResourceName());

        final String namespace;

        if (knativeServiceUri.getNamespace() == null) {
            namespace = knativeClient.getNamespace();
            logDefaultNamespace(namespace);
        } else {
            namespace = knativeServiceUri.getNamespace();
        }

        Service service = knativeClient.services().inNamespace(namespace).withName(knativeServiceUri.getResourceName()).get();
        if (null == service) {
            logger.error("Knative {} service not found on the {} namespace.", knativeServiceUri.getResourceName(), namespace);
            return Optional.empty();
        }
        logger.debug("Found Knative endpoint at {}", service.getStatus().getUrl());
        return Optional.of(URI.create(service.getStatus().getUrl()));
    }

    private void logConnection(KnativeClient client, String resourceName) {
        logger.info("Connected to Knative, current namespace is {}. Resource name for discovery is {}",
                client.getNamespace(),
                resourceName);
    }
}
