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/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2014 Red Hat, Inc., and individual contributors
 * as indicated by the @author tags.
 *
 * 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 io.undertow.websockets.jsr;

import java.net.InetSocketAddress;
import java.util.ArrayList;
import java.util.EnumSet;
import java.util.List;
import java.util.concurrent.Executor;
import java.util.function.Supplier;

import javax.servlet.DispatcherType;
import javax.servlet.FilterRegistration;
import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.websocket.DeploymentException;
import javax.websocket.Extension;
import javax.websocket.server.ServerContainer;
import javax.websocket.server.ServerEndpointConfig;

import io.netty.channel.EventLoopGroup;
import io.netty.util.concurrent.GlobalEventExecutor;
import io.undertow.servlet.ServletExtension;
import io.undertow.servlet.Servlets;
import io.undertow.servlet.api.DeploymentInfo;
import io.undertow.servlet.api.ThreadSetupHandler;
import io.undertow.servlet.core.ContextClassLoaderSetupAction;
import io.undertow.servlet.spec.ServletContextImpl;

/**
 * @author Stuart Douglas
 */
public class Bootstrap implements ServletExtension {

    public static final String FILTER_NAME = "Undertow Web Socket Filter";

    @Override
    public void handleDeployment(DeploymentInfo deploymentInfo, ServletContext servletContext) {
        WebSocketDeploymentInfo info = (WebSocketDeploymentInfo) deploymentInfo.getServletContextAttributes().get(WebSocketDeploymentInfo.ATTRIBUTE_NAME);

        if (info == null) {
            return;
        }

        final List setup = new ArrayList<>();
        setup.add(new ContextClassLoaderSetupAction(deploymentInfo.getClassLoader()));
        setup.addAll(deploymentInfo.getThreadSetupActions());

        InetSocketAddress bind = null;
        if(info.getClientBindAddress() != null) {
            bind = new InetSocketAddress(info.getClientBindAddress(), 0);
        }

        List extensions = new ArrayList<>();
//        for(WebSocketServerExtensionHandshaker e: info.getServerExtensions()) {
//
//            extensions.add(new ExtensionImpl(e.getName(), Collections.emptyList()));
//        }
        ServerWebSocketContainer container = new ServerWebSocketContainer(deploymentInfo.getClassIntrospecter(), servletContext.getClassLoader(), new Supplier() {
            @Override
            public EventLoopGroup get() {
                if (info.getEventLoopGroup() != null) {
                    return info.getEventLoopGroup();
                }
                return UndertowContainerProvider.getDefaultEventLoopGroup();
            }
        }, setup, info.isDispatchToWorkerThread(), bind, info.getReconnectHandler(), new Supplier() {
            @Override
            public Executor get() {
                if (info.getExecutor() != null) {
                    return info.getExecutor().get();
                }
                return GlobalEventExecutor.INSTANCE;
            }
        }, extensions, info.getMaxFrameSize());
        try {
            for (Class annotation : info.getAnnotatedEndpoints()) {
                container.addEndpoint(annotation);
            }
            for(ServerEndpointConfig programatic : info.getProgramaticEndpoints()) {
                container.addEndpoint(programatic);
            }
        } catch (DeploymentException e) {
            throw new RuntimeException(e);
        }
        servletContext.setAttribute(ServerContainer.class.getName(), container);
        info.containerReady(container);
        SecurityActions.addContainer(deploymentInfo.getClassLoader(), container);

        deploymentInfo.addListener(Servlets.listener(WebSocketListener.class));
        deploymentInfo.addDeploymentCompleteListener(new ServletContextListener() {
            @Override
            public void contextInitialized(ServletContextEvent sce) {
                container.validateDeployment();
            }

            @Override
            public void contextDestroyed(ServletContextEvent sce) {

            }
        });
    }

    private static final class WebSocketListener implements ServletContextListener {

        private ServerWebSocketContainer container;

        @Override
        public void contextInitialized(ServletContextEvent sce) {
            container = (ServerWebSocketContainer) sce.getServletContext().getAttribute(ServerContainer.class.getName());
            FilterRegistration.Dynamic filter = sce.getServletContext().addFilter(FILTER_NAME, JsrWebSocketFilter.class);
            sce.getServletContext().addListener(JsrWebSocketFilter.LogoutListener.class);
            filter.setAsyncSupported(true);
            if(!container.getConfiguredServerEndpoints().isEmpty()){
                filter.addMappingForUrlPatterns(EnumSet.of(DispatcherType.REQUEST), true, "/*");
            } else {
                container.setContextToAddFilter((ServletContextImpl) sce.getServletContext());
            }
        }

        @Override
        public void contextDestroyed(ServletContextEvent sce) {
            SecurityActions.removeContainer(sce.getServletContext().getClassLoader());
            container.close();
        }
    }

}