//
//  ========================================================================
//  Copyright (c) 1995-2017 Mort Bay Consulting Pty. Ltd.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
//
//  You may elect to redistribute this code under either of these licenses.
//  ========================================================================
//

package org.eclipse.jetty.cdi.websocket.wsscope;

import static org.hamcrest.Matchers.is;
import static org.hamcrest.Matchers.not;
import static org.hamcrest.Matchers.sameInstance;
import static org.junit.Assert.assertThat;

import java.util.Set;
import java.util.concurrent.Callable;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;

import javax.enterprise.inject.spi.Bean;

import org.eclipse.jetty.cdi.core.AnyLiteral;
import org.eclipse.jetty.cdi.core.ScopedInstance;
import org.eclipse.jetty.cdi.core.logging.Logging;
import org.eclipse.jetty.cdi.websocket.WebSocketScopeContext;
import org.eclipse.jetty.websocket.api.Session;
import org.jboss.weld.environment.se.Weld;
import org.jboss.weld.environment.se.WeldContainer;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;

public class WebSocketScopeSessionTest
{
    private static Weld weld;
    private static WeldContainer container;

    @BeforeClass
    public static void startWeld()
    {
        Logging.config();
        weld = new Weld();
        container = weld.initialize();
    }

    @AfterClass
    public static void stopWeld()
    {
        weld.shutdown();
    }
    
    @Test
    public void testSessionActivation() throws Exception
    {
        ScopedInstance<WebSocketScopeContext> wsScopeBean = newInstance(WebSocketScopeContext.class);
        WebSocketScopeContext wsScope = wsScopeBean.instance;

        wsScope.create();
        try
        {
            // Scope 1
            wsScope.begin();
            BogusSession sess = new BogusSession("1");
            wsScope.setSession(sess);
            ScopedInstance<BogusSocket> sock1Bean = newInstance(BogusSocket.class);
            BogusSocket sock1 = sock1Bean.instance;
            assertThat("Socket 1 Session",sock1.getSession().toString(),is(sess.toString()));

            sock1Bean.destroy();
        }
        finally
        {
            wsScope.end();
        }

        wsScope.destroy();
        wsScopeBean.destroy();
    }
    
    @Test
    public void testMultiSession_Sequential() throws Exception
    {
        ScopedInstance<WebSocketScopeContext> wsScope1Bean = newInstance(WebSocketScopeContext.class);
        WebSocketScopeContext wsScope1 = wsScope1Bean.instance;
        
        ScopedInstance<WebSocketScopeContext> wsScope2Bean = newInstance(WebSocketScopeContext.class);
        WebSocketScopeContext wsScope2 = wsScope2Bean.instance;

        wsScope1.create();
        try
        {
            // Scope 1
            wsScope1.begin();
            BogusSession sess = new BogusSession("1");
            wsScope1.setSession(sess);
            ScopedInstance<BogusSocket> sock1Bean = newInstance(BogusSocket.class);
            BogusSocket sock1 = sock1Bean.instance;
            assertThat("Socket 1 Session",sock1.getSession(),sameInstance((Session)sess));
            sock1Bean.destroy();
        }
        finally
        {
            wsScope1.end();
        }
        
        wsScope1.destroy();
        wsScope1Bean.destroy();

        wsScope2.create();
        try
        {
            // Scope 2
            wsScope2.begin();
            BogusSession sess = new BogusSession("2");
            wsScope2.setSession(sess);
            ScopedInstance<BogusSocket> sock2Bean = newInstance(BogusSocket.class);
            BogusSocket sock2 = sock2Bean.instance;
            assertThat("Socket 2 Session",sock2.getSession(),sameInstance((Session)sess));
            sock2Bean.destroy();
        }
        finally
        {
            wsScope2.end();
        }

        wsScope2.destroy();
        wsScope2Bean.destroy();
    }
    
    @Test
    public void testMultiSession_Overlapping() throws Exception
    {
        final CountDownLatch midLatch = new CountDownLatch(2);
        final CountDownLatch end1Latch = new CountDownLatch(1);
        
        Callable<Session> call1 = new Callable<Session>() {
            @Override
            public Session call() throws Exception
            {
                Session ret = null;
                ScopedInstance<WebSocketScopeContext> wsScope1Bean = newInstance(WebSocketScopeContext.class);
                WebSocketScopeContext wsScope1 = wsScope1Bean.instance;
                
                wsScope1.create();
                try
                {
                    // Scope 1
                    wsScope1.begin();
                    BogusSession sess = new BogusSession("1");
                    wsScope1.setSession(sess);
                    
                    midLatch.countDown();
                    midLatch.await(1, TimeUnit.SECONDS);
                    
                    ScopedInstance<BogusSocket> sock1Bean = newInstance(BogusSocket.class);
                    BogusSocket sock1 = sock1Bean.instance;
                    assertThat("Socket 1 Session",sock1.getSession(),sameInstance((Session)sess));
                    ret = sock1.getSession();
                    sock1Bean.destroy();
                }
                finally
                {
                    wsScope1.end();
                }
                
                wsScope1.destroy();
                wsScope1Bean.destroy();
                end1Latch.countDown();
                return ret;
            }
        };
        
        final CountDownLatch end2Latch = new CountDownLatch(1);
        
        Callable<Session> call2 = new Callable<Session>() {
            @Override
            public Session call() throws Exception
            {
                Session ret = null;
                ScopedInstance<WebSocketScopeContext> wsScope2Bean = newInstance(WebSocketScopeContext.class);
                WebSocketScopeContext wsScope2 = wsScope2Bean.instance;

                wsScope2.create();
                try
                {
                    // Scope 2
                    wsScope2.begin();
                    BogusSession sess = new BogusSession("2");
                    wsScope2.setSession(sess);
                    ScopedInstance<BogusSocket> sock2Bean = newInstance(BogusSocket.class);
                    
                    midLatch.countDown();
                    midLatch.await(1, TimeUnit.SECONDS);
                    
                    BogusSocket sock2 = sock2Bean.instance;
                    ret = sock2.getSession();
                    assertThat("Socket 2 Session",sock2.getSession(),sameInstance((Session)sess)); 
                    sock2Bean.destroy();
                }
                finally
                {
                    wsScope2.end();
                }

                wsScope2.destroy();
                wsScope2Bean.destroy();
                end2Latch.countDown();
                return ret;
            }
        };
        
        ExecutorService svc = Executors.newFixedThreadPool(4);
        Future<Session> fut1 = svc.submit(call1);
        Future<Session> fut2 = svc.submit(call2);
        
        Session sess1 = fut1.get(1,TimeUnit.SECONDS);
        Session sess2 = fut2.get(1,TimeUnit.SECONDS);
        
        assertThat("Sessions are different", sess1, not(sameInstance(sess2)));
    }

    @SuppressWarnings({ "rawtypes", "unchecked" })
    public static <T> ScopedInstance<T> newInstance(Class<T> clazz)
    {
        ScopedInstance sbean = new ScopedInstance();
        Set<Bean<?>> beans = container.getBeanManager().getBeans(clazz,AnyLiteral.INSTANCE);
        if (beans.size() > 0)
        {
            sbean.bean = beans.iterator().next();
            sbean.creationalContext = container.getBeanManager().createCreationalContext(sbean.bean);
            sbean.instance = container.getBeanManager().getReference(sbean.bean,clazz,sbean.creationalContext);
            return sbean;
        }
        else
        {
            throw new RuntimeException(String.format("Can't find class %s",clazz));
        }
    }
}
