/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.reef.webserver;

import org.apache.reef.client.DriverServiceConfiguration;
import org.apache.reef.driver.context.ActiveContext;
import org.apache.reef.driver.evaluator.EvaluatorDescriptor;
import org.apache.reef.runtime.common.driver.parameters.JobIdentifier;
import org.apache.reef.runtime.common.launch.REEFMessageCodec;
import org.apache.reef.tang.Configuration;
import org.apache.reef.tang.Configurations;
import org.apache.reef.tang.Injector;
import org.apache.reef.tang.Tang;
import org.apache.reef.tang.exceptions.InjectionException;
import org.apache.reef.util.Optional;
import org.apache.reef.wake.remote.RemoteConfiguration;
import org.apache.reef.wake.time.event.StartTime;
import org.apache.reef.wake.time.event.StopTime;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.apache.commons.lang.NotImplementedException;

import javax.inject.Inject;
import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Map;

/**
 * Test Http Configuration and runtime handlers.
 */
public class TestHttpConfiguration {

  private static final Format DATE_TIME_FORMAT = new SimpleDateFormat("yyyy MM dd HH:mm:ss");

  private Injector injector;

  @Before
  public void setUp() throws InjectionException {

    final Configuration httpHandlerConfiguration = HttpHandlerConfiguration.CONF
        .set(HttpHandlerConfiguration.HTTP_HANDLERS, HttpServerReefEventHandler.class)
        .build();

    final Configuration driverConfigurationForHttpServer = DriverServiceConfiguration.CONF
        .set(DriverServiceConfiguration.ON_EVALUATOR_ALLOCATED,
            ReefEventStateManager.AllocatedEvaluatorStateHandler.class)
        .set(DriverServiceConfiguration.ON_CONTEXT_ACTIVE, ReefEventStateManager.ActiveContextStateHandler.class)
        .set(DriverServiceConfiguration.ON_TASK_RUNNING, ReefEventStateManager.TaskRunningStateHandler.class)
        .set(DriverServiceConfiguration.ON_DRIVER_STARTED, ReefEventStateManager.StartStateHandler.class)
        .set(DriverServiceConfiguration.ON_DRIVER_STOP, ReefEventStateManager.StopStateHandler.class)
        .build();

    final Configuration contextConfig = Tang.Factory.getTang().newConfigurationBuilder()
        .bindImplementation(ActiveContext.class, MockActiveContext.class)
        .bindNamedParameter(RemoteConfiguration.ManagerName.class, "REEF_TEST_REMOTE_MANAGER")
        .bindNamedParameter(RemoteConfiguration.MessageCodec.class, REEFMessageCodec.class)
        .bindNamedParameter(JobIdentifier.class, "my job")
        .build();

    final Configuration configuration = Configurations.merge(
        httpHandlerConfiguration, driverConfigurationForHttpServer, contextConfig);

    this.injector = Tang.Factory.getTang().newInjector(configuration);
  }

  @Test
  public void allocatedEvaluatorStateHandlerTest() throws InjectionException {
    final ReefEventStateManager.AllocatedEvaluatorStateHandler h =
        this.injector.getInstance(ReefEventStateManager.AllocatedEvaluatorStateHandler.class);
    Assert.assertNotNull(h);
  }

  @Test
  public void activeContextStateHandlerTest() throws InjectionException {

    final ReefEventStateManager.ActiveContextStateHandler h =
        this.injector.getInstance(ReefEventStateManager.ActiveContextStateHandler.class);
    Assert.assertNotNull(h);

    final MockActiveContext activityContext = injector.getInstance(MockActiveContext.class);
    h.onNext(activityContext);

    final ReefEventStateManager reefEventStateManager =
        this.injector.getInstance(ReefEventStateManager.class);

    final Map<String, ActiveContext> contexts = reefEventStateManager.getContexts();
    Assert.assertEquals(1, contexts.size());

    for (final ActiveContext context : contexts.values()) {
      Assert.assertEquals(activityContext.getId(), context.getId());
    }
  }

  @Test
  public void taskRunningStateHandlerTest() throws InjectionException {
    final ReefEventStateManager.TaskRunningStateHandler h =
        this.injector.getInstance(ReefEventStateManager.TaskRunningStateHandler.class);
    Assert.assertNotNull(h);
  }

  @Test
  public void stopStateHandlerTest() throws InjectionException {

    final ReefEventStateManager.StopStateHandler h =
        this.injector.getInstance(ReefEventStateManager.StopStateHandler.class);
    Assert.assertNotNull(h);

    final StopTime st = new StopTime(new Date().getTime());
    h.onNext(st);

    final ReefEventStateManager reefEventStateManager =
        this.injector.getInstance(ReefEventStateManager.class);

    Assert.assertEquals(reefEventStateManager.getStopTime(), convertTime(st.getTimeStamp()));
  }

  @Test
  public void startStateHandlerTest() throws InjectionException {

    final ReefEventStateManager.StartStateHandler h =
        this.injector.getInstance(ReefEventStateManager.StartStateHandler.class);
    Assert.assertNotNull(h);

    final StartTime st = new StartTime(new Date().getTime());
    h.onNext(st);

    final ReefEventStateManager reefEventStateManager =
        this.injector.getInstance(ReefEventStateManager.class);
    Assert.assertEquals(reefEventStateManager.getStartTime(), convertTime(st.getTimeStamp()));
  }

  private String convertTime(final long time) {
    return DATE_TIME_FORMAT.format(new Date(time)).toString();
  }
}

final class MockActiveContext implements ActiveContext {

  @Inject
  MockActiveContext() {
  }

  @Override
  public void close() {
    throw new NotImplementedException();
  }

  @Override
  public void submitTask(final Configuration taskConf) {
    throw new NotImplementedException();
  }

  @Override
  public void submitContext(final Configuration contextConfiguration) {
    throw new NotImplementedException();
  }

  @Override
  public void submitContextAndService(final Configuration contextConfiguration,
                                      final Configuration serviceConfiguration) {
    throw new NotImplementedException();
  }

  @Override
  public void sendMessage(final byte[] message) {
    throw new NotImplementedException();
  }

  @Override
  public String getEvaluatorId() {
    throw new NotImplementedException();
  }

  @Override
  public Optional<String> getParentId() {
    throw new NotImplementedException();
  }

  @Override
  public EvaluatorDescriptor getEvaluatorDescriptor() {
    throw new NotImplementedException();
  }

  @Override
  public String getId() {
    return "9999";
  }
}