package org.jboss.resteasy.test.providers.sse;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;

import javax.ws.rs.ServiceUnavailableException;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.client.Client;
import javax.ws.rs.client.ClientBuilder;
import javax.ws.rs.client.WebTarget;
import javax.ws.rs.core.Response;
import javax.ws.rs.sse.InboundSseEvent;
import javax.ws.rs.sse.SseEvent;
import javax.ws.rs.sse.SseEventSource;

import org.jboss.arquillian.container.test.api.Deployment;
import org.jboss.arquillian.container.test.api.RunAsClient;
import org.jboss.arquillian.junit.Arquillian;
import org.jboss.resteasy.spi.HttpResponseCodes;
import org.jboss.resteasy.test.providers.sse.resource.SseReconnectResource;
import org.jboss.resteasy.utils.PortProviderUtil;
import org.jboss.resteasy.utils.TestUtil;
import org.jboss.shrinkwrap.api.Archive;
import org.jboss.shrinkwrap.api.spec.WebArchive;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;

@RunWith(Arquillian.class)
@RunAsClient
public class SseReconnectTest {

   @Deployment
   public static Archive<?> deploy() {
      WebArchive war = TestUtil.prepareArchive(SseReconnectTest.class.getSimpleName());
      return TestUtil.finishContainerPrepare(war, null, SseReconnectResource.class);
   }

   private String generateURL(String path)
   {
      return PortProviderUtil.generateURL(path, SseReconnectTest.class.getSimpleName());
   }

   /**
    * @tpTestDetails Check SseEvent.getReconnectDelay() returns SseEvent.RECONNECT_NOT_SET,
    * when OutboundSseEvent.reconnectDelay() is not set.
    * @tpInfo RESTEASY-1680
    * @tpSince RESTEasy 3.5.0
    */
   @Test
   public void testReconnectDelayIsNotSet() throws Exception {
      Client client = ClientBuilder.newClient();
      try {
         WebTarget baseTarget = client.target(generateURL("/reconnect/defaultReconnectDelay"));
         try (Response response = baseTarget.request().get()) {
            Assert.assertEquals(HttpResponseCodes.SC_OK, response.getStatus());
            Assert.assertEquals(SseEvent.RECONNECT_NOT_SET, (long) response.readEntity(long.class));
         }
      } finally {
         client.close();
      }
   }

   /**
    * @tpTestDetails *** Check SseEvent.getReconnectDelay() returns correct delay,
    * when OutboundSseEvent.reconnectDelay() is set.
    * @tpInfo RESTEASY-1680
    * @tpSince RESTEasy 3.5.0
    */
   @Test
   public void testReconnectDelayIsSet() throws Exception {
      Client client = ClientBuilder.newClient();
      try {
         WebTarget baseTarget = client.target(generateURL("/reconnect/reconnectDelaySet"));
         try (Response response = baseTarget.request().get()) {
            Assert.assertEquals(HttpResponseCodes.SC_OK, response.getStatus());
            Assert.assertEquals(1000L, (long) response.readEntity(long.class));
         }
      } finally {
         client.close();
      }
   }

   /**
    * @tpTestDetails SseEventSource receives HTTP 503 + "Retry-After" from the SSE endpoint. Check that SseEventSource
    * retries after the specified period
    * @tpInfo RESTEASY-1680
    * @tpSince RESTEasy 3.5.0
    */
   @Test
   public void testSseEndpointUnavailable() throws Exception {
      final CountDownLatch latch = new CountDownLatch(1);
      final List<String> results = new ArrayList<String>();
      Client client = ClientBuilder.newBuilder().build();
      try {
         WebTarget target = client.target(generateURL("/reconnect/unavailable"));
         SseEventSource msgEventSource = SseEventSource.target(target).build();
         try (SseEventSource eventSource = msgEventSource) {
            eventSource.register(event -> {
               results.add(event.readData(String.class));
               latch.countDown();
            }, ex -> {
               });
            eventSource.open();

            boolean waitResult = latch.await(30, TimeUnit.SECONDS);
            Assert.assertTrue("Waiting for event to be delivered has timed out.", waitResult);
         }
         Assert.assertTrue("ServiceAvailable message is expected", results.get(0).equals("ServiceAvailable"));
      } finally {
         client.close();
      }
   }

   /**
    * @tpTestDetails SseEventSource receives HTTP 503 + "Retry-After"
    * from the SSE endpoint. Endpoint does retries but still does not succeed
    * @tpInfo RESTEASY-2854
    * @tpSince RESTEasy 4.7.0
    */
   @Test
   public void testSseEndpointUnavailableAfterRetry() throws Exception {
      final CountDownLatch latch = new CountDownLatch(1);
      final AtomicInteger errors = new AtomicInteger(0);
      final List<String> results = new ArrayList<String>();
      Client client = ClientBuilder.newBuilder().build();
      try {
         WebTarget target = client.target(generateURL("/reconnect/unavailableAfterRetry"));
         SseEventSource msgEventSource = SseEventSource.target(target).build();
         try (SseEventSource eventSource = msgEventSource) {
            eventSource.register(event -> {
               results.add(event.readData(String.class));
               latch.countDown();
            }, ex -> {
               errors.incrementAndGet();
               Assert.assertTrue("ServiceUnavalile exception is expected", ex instanceof ServiceUnavailableException);
            });
            eventSource.open();

            boolean waitResult = latch.await(15, TimeUnit.SECONDS);
            Assert.assertEquals(1, errors.get());
         }
      } finally {
         client.close();
      }
   }

   /**
    * @tpTestDetails Check that SseEventSource use last received 'retry' field value as the default reconnect delay for all future requests.
    * @tpInfo RESTEASY-1958
    * @tpSince RESTEasy
    */
   @Test
   public void testReconnectDelayIsUsed() throws Exception
   {
      CountDownLatch latch = new CountDownLatch(1);
      List<InboundSseEvent> results = new ArrayList<>();
      AtomicInteger errorCount = new AtomicInteger();
      Client client = ClientBuilder.newBuilder().build();
      try
      {
         WebTarget target = client.target(generateURL("/reconnect/testReconnectDelayIsUsed"));
         SseEventSource sseEventSource = SseEventSource.target(target).reconnectingEvery(500, TimeUnit.MILLISECONDS)
               .build();
         sseEventSource.register(event -> {
            results.add(event);
            latch.countDown();
         }, error -> {
            if (error instanceof WebApplicationException)
            {
               if (599 == ((WebApplicationException) error).getResponse().getStatus())
               {
                  return;
               }
            }
            errorCount.incrementAndGet();
         });
         try (SseEventSource eventSource = sseEventSource)
         {
            eventSource.open();
            boolean waitResult = latch.await(30, TimeUnit.SECONDS);
            Assert.assertTrue("Waiting for event to be delivered has timed out.", waitResult);
            Assert.assertEquals(0, errorCount.get());
            Assert.assertEquals(1, results.size());
            Assert.assertTrue(results.get(0).isReconnectDelaySet());
            Assert.assertEquals(TimeUnit.SECONDS.toMillis(3), results.get(0).getReconnectDelay());
         }
      }
      finally
      {
         client.close();
      }
   }

   @Test
   public void testReconnect() throws Exception
   {
      CountDownLatch latch = new CountDownLatch(1);
      List<InboundSseEvent> results = new ArrayList<>();
      Client client = ClientBuilder.newBuilder().build();
      try
      {
         WebTarget target = client.target(generateURL("/reconnect/sselost"));
         SseEventSource sseEventSource = SseEventSource.target(target).reconnectingEvery(2000, TimeUnit.MILLISECONDS)
                 .build();
         sseEventSource.register(event -> {
            results.add(event);
            latch.countDown();
         });
         try (SseEventSource eventSource = sseEventSource)
         {
            eventSource.open();
            boolean waitResult = latch.await(30, TimeUnit.SECONDS);
            Assert.assertTrue("Waiting for event to be delivered has timed out.", waitResult);
            Assert.assertEquals(1, results.size());
         }
      }
      finally
      {
         client.close();
      }
   }

   @Test
   public void testEventSourceIsOpen() throws Exception
   {
      CountDownLatch latch = new CountDownLatch(1);
      List<InboundSseEvent> results = new ArrayList<>();
      Client client = ClientBuilder.newBuilder().build();
      try
      {
         WebTarget target = client.target(generateURL("/reconnect/data"));
         SseEventSource sseEventSource = SseEventSource.target(target).build();
         sseEventSource.register(event -> {
            results.add(event);
            latch.countDown();
         });
         try (SseEventSource eventSource = sseEventSource)
         {
            eventSource.open();
            boolean waitResult = latch.await(30, TimeUnit.SECONDS);
            Assert.assertTrue("Waiting for event to be delivered has timed out.", waitResult);
            Assert.assertEquals(1, results.size());
            Assert.assertTrue("SseEventSource#isOpen returns false", eventSource.isOpen());
         }
      }
      finally
      {
         client.close();
      }
   }



}
