/**
 * 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.slider.server.appmaster.web.rest.agent;

import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.ClientResponse;
import com.sun.jersey.api.client.WebResource;
import com.sun.jersey.api.client.config.ClientConfig;
import com.sun.jersey.api.client.config.DefaultClientConfig;
import com.sun.jersey.api.json.JSONConfiguration;
import junit.framework.Assert;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.yarn.conf.YarnConfiguration;
import org.apache.slider.common.SliderKeys;
import org.apache.slider.common.tools.SliderUtils;
import org.apache.slider.core.conf.MapOperations;
import org.apache.slider.server.appmaster.model.mock.MockFactory;
import org.apache.slider.server.appmaster.model.mock.MockProviderService;
import org.apache.slider.server.appmaster.model.mock.MockRecordFactory;
import org.apache.slider.server.appmaster.model.mock.MockSliderClusterProtocol;
import org.apache.slider.server.appmaster.state.AppState;
import org.apache.slider.server.appmaster.state.ProviderAppState;
import org.apache.slider.server.appmaster.state.SimpleReleaseSelector;
import org.apache.slider.server.appmaster.web.WebAppApi;
import org.apache.slider.server.appmaster.web.WebAppApiImpl;
import org.apache.slider.server.appmaster.web.rest.RestPaths;
import org.apache.slider.server.services.security.CertificateManager;
import org.apache.slider.server.services.security.SecurityUtils;
import org.junit.After;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.ws.rs.core.MediaType;
import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;

import static org.junit.Assert.assertEquals;

public class TestAMAgentWebServices {

  static {
    //for localhost testing only
    javax.net.ssl.HttpsURLConnection.setDefaultHostnameVerifier(
        new javax.net.ssl.HostnameVerifier(){

          public boolean verify(String hostname,
                                javax.net.ssl.SSLSession sslSession) {
            if (hostname.equals("localhost")) {
              return true;
            }
            return false;
          }
        });

    SecurityUtils.initializeSecurityParameters(new MapOperations());
    MapOperations compOperations = new MapOperations();
    CertificateManager certificateManager = new CertificateManager();
    certificateManager.initRootCert(compOperations);
    String keystoreFile = SecurityUtils.getSecurityDir() + File.separator + SliderKeys.KEYSTORE_FILE_NAME;
    String password = SecurityUtils.getKeystorePass();
    System.setProperty("javax.net.ssl.trustStore", keystoreFile);
    System.setProperty("javax.net.ssl.trustStorePassword", password);
    System.setProperty("javax.net.ssl.trustStoreType", "PKCS12");
  }

  protected static final Logger log =
    LoggerFactory.getLogger(TestAMAgentWebServices.class);
  
  public static final int RM_MAX_RAM = 4096;
  public static final int RM_MAX_CORES = 64;
  public static final String AGENT_URL =
    "https://localhost:${PORT}/ws/v1/slider/agents/";
  
  static MockFactory factory = new MockFactory();
  private static Configuration conf = new Configuration();
  private static WebAppApi slider;

  private static FileSystem fs;
  private AgentWebApp webApp;
  private String base_url;

  @Before
  public void setUp() throws Exception {
    YarnConfiguration conf = SliderUtils.createConfiguration();
    fs = FileSystem.get(new URI("file:///"), conf);
    AppState appState = null;
    try {
      fs = FileSystem.get(new URI("file:///"), conf);
      File
          historyWorkDir =
          new File("target/history", "TestAMAgentWebServices");
      org.apache.hadoop.fs.Path
          historyPath =
          new org.apache.hadoop.fs.Path(historyWorkDir.toURI());
      fs.delete(historyPath, true);
      appState = new AppState(new MockRecordFactory());
      appState.setContainerLimits(RM_MAX_RAM, RM_MAX_CORES);
      appState.buildInstance(
          factory.newInstanceDefinition(0, 0, 0),
          new Configuration(),
          new Configuration(false),
          factory.ROLES,
          fs,
          historyPath,
          null, null, new SimpleReleaseSelector());
    } catch (Exception e) {
      log.error("Failed to set up app {}", e);
    }
    ProviderAppState providerAppState = new ProviderAppState("undefined",
                                                             appState);

    slider = new WebAppApiImpl(new MockSliderClusterProtocol(), providerAppState,
                               new MockProviderService(), null);

    MapOperations compOperations = new MapOperations();

    webApp = AgentWebApp.$for(AgentWebApp.BASE_PATH, slider,
                              RestPaths.WS_AGENT_CONTEXT_ROOT)
        .withComponentConfig(compOperations)
        .start();
    base_url = AGENT_URL.replace("${PORT}",
                                 Integer.toString(webApp.getSecuredPort()));

  }

  @After
  public void tearDown () throws Exception {
    webApp.stop();
    webApp = null;
  }

  public TestAMAgentWebServices() {
  }

  @Test
  public void testRegistration() throws Exception {
    RegistrationResponse response;
    Client client = createTestClient();
    WebResource webResource = client.resource(base_url + "test/register");
    response = webResource.type(MediaType.APPLICATION_JSON)
        .post(RegistrationResponse.class, createDummyJSONRegister());
    Assert.assertEquals(RegistrationStatus.OK, response.getResponseStatus());
  }

  protected Client createTestClient() {
    ClientConfig clientConfig = new DefaultClientConfig();
    clientConfig.getFeatures().put(JSONConfiguration.FEATURE_POJO_MAPPING, Boolean.TRUE);
    return Client.create(clientConfig);
  }

  @Test
  public void testHeartbeat() throws Exception {
    HeartBeatResponse response;
    Client client = createTestClient();
    WebResource webResource = client.resource(base_url + "test/heartbeat");
    response = webResource.type(MediaType.APPLICATION_JSON)
        .post(HeartBeatResponse.class, createDummyHeartBeat());
    assertEquals(response.getResponseId(), 0L);
  }

  @Test
  public void testHeadURL() throws Exception {
    Client client = createTestClient();
    WebResource webResource = client.resource(base_url);
    ClientResponse response = webResource.type(MediaType.APPLICATION_JSON)
                                         .head();
    assertEquals(200, response.getStatus());
  }

//  @Test
//  public void testSleepForAWhile() throws Throwable {
//    log.info("Agent is running at {}", base_url);
//    Thread.sleep(60 * 1000);
//  }
  
  private Register createDummyJSONRegister() {
    Register register = new Register();
    register.setResponseId(-1);
    register.setTimestamp(System.currentTimeMillis());
    register.setHostname("dummyHost");
    return register;
  }

  private HeartBeat createDummyHeartBeat() {
    HeartBeat json = new HeartBeat();
    json.setResponseId(-1);
    json.setTimestamp(System.currentTimeMillis());
    json.setHostname("dummyHost");
    return json;
  }

  @AfterClass
  public static void tearDownClass() throws Exception{
    Path directory = Paths.get(SecurityUtils.getSecurityDir());
    Files.walkFileTree(directory, new SimpleFileVisitor<Path>() {
      @Override
      public FileVisitResult visitFile(Path file, BasicFileAttributes attrs)
          throws IOException {
        Files.delete(file);
        return FileVisitResult.CONTINUE;
      }

      @Override
      public FileVisitResult postVisitDirectory(Path dir, IOException exc)
          throws IOException {
        Files.delete(dir);
        return FileVisitResult.CONTINUE;
      }

    });
  }
}