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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) [2018-2021] 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/main/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
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
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 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
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package fish.payara.microprofile.openapi.impl.rest.init;

import fish.payara.microprofile.openapi.impl.admin.OpenApiServiceConfiguration;
import fish.payara.microprofile.openapi.rest.app.OpenApiApplication;
import static java.util.Arrays.asList;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import jakarta.servlet.HttpConstraintElement;
import jakarta.servlet.ServletContainerInitializer;
import jakarta.servlet.ServletContext;
import jakarta.servlet.ServletException;
import jakarta.servlet.ServletRegistration;
import jakarta.servlet.ServletSecurityElement;
import static jakarta.servlet.annotation.ServletSecurity.TransportGuarantee.CONFIDENTIAL;
import static org.glassfish.common.util.StringHelper.isEmpty;
import org.glassfish.internal.api.Globals;
import org.glassfish.jersey.servlet.ServletContainer;
import org.glassfish.jersey.servlet.init.JerseyServletContainerInitializer;

/**
 * Deploys the OpenAPI application to each listener when an application is
 * deployed.
 */
public class OpenApiServletContainerInitializer implements ServletContainerInitializer {

    @Override
    public void onStartup(Set> c, ServletContext ctx) throws ServletException {

        // Only deploy to app root
        if (!"".equals(ctx.getContextPath())) {
            return;
        }
        OpenApiServiceConfiguration configuration = Globals.getDefaultHabitat().getService(OpenApiServiceConfiguration.class);

        // Check if there is already an endpoint for OpenAPI
        Map registrations = ctx.getServletRegistrations();
        for (ServletRegistration reg : registrations.values()) {
            if (reg.getMappings().contains(configuration.getEndpoint())) {
                return;
            }
        }

        String virtualServers = configuration.getVirtualServers();
        if (!isEmpty(virtualServers)
                && !asList(virtualServers.split(",")).contains(ctx.getVirtualServerName())) {
            return;
        }

        // Start the OpenAPI application
        ServletContainer servletContainer = new ServletContainer(new OpenApiApplication());
        ServletRegistration.Dynamic reg = ctx.addServlet("microprofile-openapi-servlet", servletContainer);
        reg.setLoadOnStartup(1);
        reg.addMapping("/" + configuration.getEndpoint()  + "/*");
        if (Boolean.parseBoolean(configuration.getSecurityEnabled())) {
            String[] roles = configuration.getRoles().split(",");
            reg.setServletSecurity(new ServletSecurityElement(new HttpConstraintElement(CONFIDENTIAL, roles)));
            ctx.declareRoles(roles);
        }
    }

}