/*
 * 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.geode.test.dunit.rules;

import static org.apache.geode.distributed.ConfigurationProperties.*;
import static org.apache.geode.test.dunit.Host.*;
import static org.apache.geode.test.dunit.internal.JUnit4DistributedTestCase.*;
import static org.junit.Assert.*;

import java.io.IOException;
import java.io.Serializable;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Properties;
import java.util.concurrent.TimeUnit;

import com.jayway.awaitility.Awaitility;
import org.junit.rules.ExternalResource;

import org.apache.geode.distributed.Locator;
import org.apache.geode.distributed.internal.InternalDistributedSystem;
import org.apache.geode.distributed.internal.InternalLocator;
import org.apache.geode.test.dunit.Host;
import org.apache.geode.test.dunit.VM;
import org.apache.geode.test.dunit.cache.internal.JUnit4CacheTestCase;
import org.apache.geode.test.dunit.internal.JUnit4DistributedTestCase;


public class LocatorServerConfigurationRule extends ExternalResource implements Serializable {

  private int locatorPort = 0;

  private boolean locatorInitialized = false;

  private JUnit4DistributedTestCase testCase;

  public LocatorServerConfigurationRule(JUnit4DistributedTestCase testCase) {
    this.testCase = testCase;
  }

  Host host = getHost(0);
  VM locator = host.getVM(0);

  @Override
  protected void before() {
    // Add initialization requirement if any.
    disconnectAllFromDS();
  }

  @Override
  protected void after() {
    disconnectAllFromDS();
  }

  /**
   * Returns getHost(0).getVM(0) as a locator instance with the given configuration properties.
   * 
   * @param locatorProperties
   *
   * @return VM locator vm
   *
   * @throws IOException
   */
  public VM getLocatorVM(Properties locatorProperties) throws IOException {
    if (!locatorProperties.containsKey(MCAST_PORT)) {
      locatorProperties.setProperty(MCAST_PORT, "0");
    }

    locatorPort = locator.invoke(() -> {
      InternalLocator locator =
          (InternalLocator) Locator.startLocatorAndDS(0, null, locatorProperties);
      locator.resetInternalLocatorFileNamesWithCorrectPortNumber(locatorPort);

      if (locator.getConfig().getEnableClusterConfiguration()) {
        Awaitility.await().atMost(65, TimeUnit.SECONDS)
            .until(() -> assertTrue(locator.isSharedConfigurationRunning()));
      }
      return locator.getPort();
    });

    this.locatorInitialized = true;
    return locator;
  }

  /**
   * Returns a node VM with given configuration properties.
   * 
   * @param index valid 1 to 3 (returns getHist(0).getVM(index)
   * @param properties
   *
   * @return VM node vm
   */
  public VM getServerVM(int index, Properties properties) {
    assertTrue("Locator not initialized. Initialize locator by calling getLocatorVM()",
        this.locatorInitialized);
    assertTrue("VM with index 0 is used for locator service.", (index != 0));
    VM nodeVM = getNodeVM(index);
    nodeVM.invoke(() -> {
      getSystem(properties);
    });
    return nodeVM;
  }

  /**
   * this will simply returns the node
   * 
   * @param index
   * @return
   */
  public VM getNodeVM(int index) {
    return host.getVM(index);
  }

  public InternalDistributedSystem getSystem(Properties properties) {
    if (!properties.containsKey(MCAST_PORT)) {
      properties.setProperty(MCAST_PORT, "0");
    }
    properties.setProperty(LOCATORS, getHostName() + "[" + locatorPort + "]");
    InternalDistributedSystem ds = testCase.getSystem(properties);
    if (testCase instanceof JUnit4CacheTestCase) {
      ((JUnit4CacheTestCase) testCase).getCache();
    }
    return ds;
  }

  public int getLocatorPort() {
    return locatorPort;
  }

  private String getHostName() {
    try {
      return InetAddress.getLocalHost().getHostName();
    } catch (UnknownHostException ignore) {
      return "localhost";
    }
  }

}