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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 *    Copyright (c) [2023] Payara Foundation and/or its affiliates. All rights reserved.
 *
 *     The contents of this file are subject to the terms of either the GNU
 *     General Public License Version 2 only ("GPL") or the Common Development
 *     and Distribution License("CDDL") (collectively, the "License").  You
 *     may not use this file except in compliance with the License.  You can
 *     obtain a copy of the License at
 *     https://github.com/payara/Payara/blob/master/LICENSE.txt
 *     See the License for the specific
 *     language governing permissions and limitations under the License.
 *
 *     When distributing the software, include this License Header Notice in each
 *     file and include the License file at glassfish/legal/LICENSE.txt.
 *
 *     GPL Classpath Exception:
 *     The Payara Foundation designates this particular file as subject to the "Classpath"
 *     exception as provided by the Payara Foundation in the GPL Version 2 section of the License
 *     file that accompanied this code.
 *
 *     Modifications:
 *     If applicable, add the following below the License Header, with the fields
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 */
package fish.payara.microprofile.telemetry.tracing.jaxrs;

import fish.payara.opentracing.OpenTelemetryService;
import fish.payara.microprofile.telemetry.tracing.PayaraTracingServices;
import jakarta.annotation.PostConstruct;
import jakarta.annotation.Priority;
import jakarta.ws.rs.Priorities;
import jakarta.ws.rs.container.ResourceInfo;
import jakarta.ws.rs.core.Context;
import org.glassfish.jersey.server.monitoring.ApplicationEvent;
import org.glassfish.jersey.server.monitoring.ApplicationEventListener;
import org.glassfish.jersey.server.monitoring.RequestEvent;
import org.glassfish.jersey.server.monitoring.RequestEventListener;

import java.util.logging.Logger;

@Priority(Priorities.HEADER_DECORATOR - 500)
public class OpenTelemetryApplicationEventListener implements ApplicationEventListener {

    private static final Logger LOG = Logger.getLogger(OpenTelemetryApplicationEventListener.class.getName());

    private OpenTelemetryService openTelemetryService;

    @Context
    private ResourceInfo resourceInfo;

    private OpenTracingHelper openTracingHelper;

    /**
     * Initialization of internal services.
     */
    @PostConstruct
    public void postConstruct() {
        LOG.finest("postConstruct()");
        final PayaraTracingServices payaraTracingServices = new PayaraTracingServices();
        this.openTelemetryService = payaraTracingServices.getOpenTelemetryService();
        this.openTracingHelper = new OpenTracingHelper();
    }


    @Override
    public void onEvent(final ApplicationEvent event) {
        LOG.config(() -> "onEvent(event.type=" + event.getType() + ")");
    }


    @Override
    public RequestEventListener onRequest(final RequestEvent event) {
        LOG.finer(() -> "onRequest(event.type=" + event.getType() + ")");
        if (!isRequestTracingInProgress()) {
            LOG.finest("isRequestTracingInProgress() returned false, nothing to do.");
            return null;
        }
        return new OpenTelemetryRequestEventListener(this.resourceInfo, this.openTelemetryService, this.openTracingHelper);
    }


    private boolean isRequestTracingInProgress() {
        return this.openTelemetryService.isEnabled();
    }
}