/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2017, Red Hat, Inc., and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.wildfly.extension.undertow;

import java.util.Map;
import javax.servlet.Servlet;

import io.undertow.server.HttpHandler;
import io.undertow.server.handlers.resource.PathResourceManager;
import io.undertow.servlet.api.DeploymentInfo;
import io.undertow.servlet.api.DeploymentManager;
import io.undertow.servlet.api.ServletContainer;
import io.undertow.servlet.api.ServletInfo;
import io.undertow.servlet.util.ImmediateInstanceFactory;
import org.jboss.as.web.host.ServletBuilder;
import org.jboss.as.web.host.WebDeploymentBuilder;
import org.jboss.as.web.host.WebDeploymentController;
import org.jboss.as.web.host.WebHost;
import org.jboss.msc.service.Service;
import org.jboss.msc.service.StartContext;
import org.jboss.msc.service.StartException;
import org.jboss.msc.service.StopContext;
import org.jboss.msc.value.InjectedValue;
import org.wildfly.extension.requestcontroller.ControlPoint;
import org.wildfly.extension.requestcontroller.RequestController;
import org.wildfly.extension.undertow.deployment.GlobalRequestControllerHandler;

/**
 * Implementation of WebHost from common web, service starts with few more dependencies than default Host
 *
 * @author Tomaz Cerar (c) 2013 Red Hat Inc.
 */
class WebHostService implements Service<WebHost>, WebHost {
    private final InjectedValue<Server> server = new InjectedValue<>();
    private final InjectedValue<Host> host = new InjectedValue<>();
    private final InjectedValue<RequestController> requestControllerInjectedValue = new InjectedValue<>();
    private volatile ControlPoint controlPoint;

    protected InjectedValue<Server> getServer() {
        return server;
    }

    protected InjectedValue<Host> getHost() {
        return host;
    }

    @Override
    public WebDeploymentController addWebDeployment(final WebDeploymentBuilder webDeploymentBuilder) throws Exception {

        DeploymentInfo d = new DeploymentInfo();
        d.setDeploymentName(webDeploymentBuilder.getContextRoot());
        d.setContextPath(webDeploymentBuilder.getContextRoot());
        d.setClassLoader(webDeploymentBuilder.getClassLoader());
        d.setResourceManager(new PathResourceManager(webDeploymentBuilder.getDocumentRoot().toPath().toAbsolutePath(), 1024 * 1024));
        d.setIgnoreFlush(false);
        for (ServletBuilder servlet : webDeploymentBuilder.getServlets()) {
            ServletInfo s;
            if (servlet.getServlet() == null) {
                s = new ServletInfo(servlet.getServletName(), (Class<? extends Servlet>) servlet.getServletClass());
            } else {
                s = new ServletInfo(servlet.getServletName(), (Class<? extends Servlet>) servlet.getServletClass(), new ImmediateInstanceFactory<>(servlet.getServlet()));
            }
            if (servlet.isForceInit()) {
                s.setLoadOnStartup(1);
            }
            s.addMappings(servlet.getUrlMappings());
            for (Map.Entry<String, String> param : servlet.getInitParams().entrySet()) {
                s.addInitParam(param.getKey(), param.getValue());
            }
            d.addServlet(s);
        }

        if (controlPoint != null) {
            d.addOuterHandlerChainWrapper(GlobalRequestControllerHandler.wrapper(controlPoint, webDeploymentBuilder.getAllowRequestPredicates()));
        }

        return new WebDeploymentControllerImpl(d);
    }

    private class WebDeploymentControllerImpl implements WebDeploymentController {

        private final DeploymentInfo deploymentInfo;
        private volatile DeploymentManager manager;

        private WebDeploymentControllerImpl(final DeploymentInfo deploymentInfo) {
            this.deploymentInfo = deploymentInfo;
        }

        @Override
        public void create() throws Exception {
            ServletContainer container = server.getValue().getServletContainer().getValue().getServletContainer();
            manager = container.addDeployment(deploymentInfo);
            manager.deploy();
        }

        @Override
        public void start() throws Exception {
            HttpHandler handler = manager.start();
            host.getValue().registerDeployment(manager.getDeployment(), handler);
        }

        @Override
        public void stop() throws Exception {
            host.getValue().unregisterDeployment(manager.getDeployment());
            manager.stop();
        }

        @Override
        public void destroy() throws Exception {
            manager.undeploy();
            ServletContainer container = server.getValue().getServletContainer().getValue().getServletContainer();
            container.removeDeployment(deploymentInfo);
        }
    }

    @Override
    public void start(StartContext context) throws StartException {
        RequestController rq = requestControllerInjectedValue.getOptionalValue();
        if(rq != null) {
            controlPoint = rq.getControlPoint("", "org.wildfly.undertow.webhost." + server.getValue().getName() + "." + host.getValue().getName());
        }
    }

    @Override
    public void stop(StopContext context) {
        if(controlPoint != null) {
            requestControllerInjectedValue.getValue().removeControlPoint(controlPoint);
        }
    }

    @Override
    public WebHost getValue() throws IllegalStateException, IllegalArgumentException {
        return this;
    }

    public InjectedValue<RequestController> getRequestControllerInjectedValue() {
        return requestControllerInjectedValue;
    }
}