/**
 * 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.hadoop.yarn.server.applicationhistoryservice;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Map;

import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.Timeout;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.http.lib.StaticUserWebFilter;
import org.apache.hadoop.security.AuthenticationFilterInitializer;
import org.apache.hadoop.service.Service.STATE;
import org.apache.hadoop.util.ExitUtil;
import org.apache.hadoop.yarn.conf.YarnConfiguration;
import org.apache.hadoop.yarn.server.timeline.MemoryTimelineStore;
import org.apache.hadoop.yarn.server.timeline.TimelineStore;
import org.apache.hadoop.yarn.server.timeline.recovery.MemoryTimelineStateStore;
import org.apache.hadoop.yarn.server.timeline.recovery.TimelineStateStore;
import org.apache.hadoop.yarn.server.timeline.security.TimelineAuthenticationFilterInitializer;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.junit.jupiter.api.Assertions.fail;

public class TestApplicationHistoryServer {

  // simple test init/start/stop ApplicationHistoryServer. Status should change.
  @Test
  @Timeout(60000)
  void testStartStopServer() throws Exception {
    ApplicationHistoryServer historyServer = new ApplicationHistoryServer();
    Configuration config = new YarnConfiguration();
    config.setClass(YarnConfiguration.TIMELINE_SERVICE_STORE,
        MemoryTimelineStore.class, TimelineStore.class);
    config.setClass(YarnConfiguration.TIMELINE_SERVICE_STATE_STORE_CLASS,
        MemoryTimelineStateStore.class, TimelineStateStore.class);
    config.set(YarnConfiguration.TIMELINE_SERVICE_WEBAPP_ADDRESS, "localhost:0");
    try {
      try {
        historyServer.init(config);
        config.setInt(YarnConfiguration.TIMELINE_SERVICE_HANDLER_THREAD_COUNT,
            0);
        historyServer.start();
        fail();
      } catch (IllegalArgumentException e) {
        assertTrue(e.getMessage().contains(
            YarnConfiguration.TIMELINE_SERVICE_HANDLER_THREAD_COUNT));
      }
      config.setInt(YarnConfiguration.TIMELINE_SERVICE_HANDLER_THREAD_COUNT,
          YarnConfiguration.DEFAULT_TIMELINE_SERVICE_CLIENT_THREAD_COUNT);
      historyServer = new ApplicationHistoryServer();
      historyServer.init(config);
      assertEquals(STATE.INITED, historyServer.getServiceState());
      ApplicationHistoryClientService historyService =
          historyServer.getClientService();
      assertNotNull(historyServer.getClientService());
      assertEquals(STATE.INITED, historyService.getServiceState());

      historyServer.start();
      assertEquals(STATE.STARTED, historyServer.getServiceState());
      assertEquals(STATE.STARTED, historyService.getServiceState());
      historyServer.stop();
      assertEquals(STATE.STOPPED, historyServer.getServiceState());
    } finally {
      historyServer.stop();
    }
  }

  // test launch method
  @Test
  @Timeout(60000)
  void testLaunch() throws Exception {
    ExitUtil.disableSystemExit();
    ApplicationHistoryServer historyServer = null;
    try {
      // Not able to modify the config of this test case,
      // but others have been customized to avoid conflicts
      historyServer =
          ApplicationHistoryServer.launchAppHistoryServer(new String[0]);
    } catch (ExitUtil.ExitException e) {
      assertEquals(0, e.status);
      ExitUtil.resetFirstExitException();
      fail();
    } finally {
      if (historyServer != null) {
        historyServer.stop();
      }
    }
  }

  //test launch method with -D arguments
  @Test
  @Timeout(60000)
  void testLaunchWithArguments() throws Exception {
    ExitUtil.disableSystemExit();
    ApplicationHistoryServer historyServer = null;
    try {
      // Not able to modify the config of this test case,
      // but others have been customized to avoid conflicts
      String[] args = new String[2];
      args[0] = "-D" + YarnConfiguration.TIMELINE_SERVICE_LEVELDB_TTL_INTERVAL_MS + "=4000";
      args[1] = "-D" + YarnConfiguration.TIMELINE_SERVICE_TTL_MS + "=200";
      historyServer =
          ApplicationHistoryServer.launchAppHistoryServer(args);
      Configuration conf = historyServer.getConfig();
      assertEquals("4000", conf.get(YarnConfiguration.TIMELINE_SERVICE_LEVELDB_TTL_INTERVAL_MS));
      assertEquals("200", conf.get(YarnConfiguration.TIMELINE_SERVICE_TTL_MS));
    } catch (ExitUtil.ExitException e) {
      assertEquals(0, e.status);
      ExitUtil.resetFirstExitException();
      fail();
    } finally {
      if (historyServer != null) {
        historyServer.stop();
      }
    }
  }

  @Test
  @Timeout(240000)
  void testFilterOverrides() throws Exception {

    HashMap<String, String> driver = new HashMap<String, String>();
    driver.put("", TimelineAuthenticationFilterInitializer.class.getName());
    driver.put(StaticUserWebFilter.class.getName(),
        StaticUserWebFilter.class.getName() + "," +
            TimelineAuthenticationFilterInitializer.class.getName());
    driver.put(AuthenticationFilterInitializer.class.getName(),
        TimelineAuthenticationFilterInitializer.class.getName());
    driver.put(TimelineAuthenticationFilterInitializer.class.getName(),
        TimelineAuthenticationFilterInitializer.class.getName());
    driver.put(AuthenticationFilterInitializer.class.getName() + ","
        + TimelineAuthenticationFilterInitializer.class.getName(),
        TimelineAuthenticationFilterInitializer.class.getName());
    driver.put(AuthenticationFilterInitializer.class.getName() + ", "
        + TimelineAuthenticationFilterInitializer.class.getName(),
        TimelineAuthenticationFilterInitializer.class.getName());

    for (Map.Entry<String, String> entry : driver.entrySet()) {
      String filterInitializer = entry.getKey();
      String expectedValue = entry.getValue();
      ApplicationHistoryServer historyServer = new ApplicationHistoryServer();
      Configuration config = new YarnConfiguration();
      config.setClass(YarnConfiguration.TIMELINE_SERVICE_STORE,
          MemoryTimelineStore.class, TimelineStore.class);
      config.setClass(YarnConfiguration.TIMELINE_SERVICE_STATE_STORE_CLASS,
          MemoryTimelineStateStore.class, TimelineStateStore.class);
      config.set(YarnConfiguration.TIMELINE_SERVICE_WEBAPP_ADDRESS, "localhost:0");
      try {
        config.set("hadoop.http.filter.initializers", filterInitializer);
        historyServer.init(config);
        historyServer.start();
        Configuration tmp = historyServer.getConfig();
        assertEquals(expectedValue, tmp.get("hadoop.http.filter.initializers"));
      } finally {
        historyServer.stop();
      }
    }
  }

  @Test
  @Timeout(240000)
  void testHostedUIs() throws Exception {

    ApplicationHistoryServer historyServer = new ApplicationHistoryServer();
    Configuration config = new YarnConfiguration();
    config.setClass(YarnConfiguration.TIMELINE_SERVICE_STORE,
        MemoryTimelineStore.class, TimelineStore.class);
    config.setClass(YarnConfiguration.TIMELINE_SERVICE_STATE_STORE_CLASS,
        MemoryTimelineStateStore.class, TimelineStateStore.class);
    config.set(YarnConfiguration.TIMELINE_SERVICE_WEBAPP_ADDRESS,
        "localhost:0");
    final String UI1 = "UI1";
    String connFileStr = "";

    File diskFile = new File("./pom.xml");
    String diskFileStr = readInputStream(new FileInputStream(diskFile));
    try {
      config.set(YarnConfiguration.TIMELINE_SERVICE_UI_NAMES, UI1);
      config.set(YarnConfiguration.TIMELINE_SERVICE_UI_WEB_PATH_PREFIX + UI1,
          "/" + UI1);
      config.set(YarnConfiguration.TIMELINE_SERVICE_UI_ON_DISK_PATH_PREFIX
          + UI1, "./");
      historyServer.init(config);
      historyServer.start();
      URL url = new URL("http://localhost:" + historyServer.getPort() + "/"
          + UI1 + "/pom.xml");
      HttpURLConnection conn = (HttpURLConnection) url.openConnection();
      conn.connect();
      assertEquals(HttpURLConnection.HTTP_OK, conn.getResponseCode());
      connFileStr = readInputStream(conn.getInputStream());
    } finally {
      historyServer.stop();
    }
    assertEquals(diskFileStr, connFileStr,
        "Web file contents should be the same as on disk contents");
  }
  private String readInputStream(InputStream input) throws Exception {
    ByteArrayOutputStream data = new ByteArrayOutputStream();
    byte[] buffer = new byte[512];
    int read;
    while ((read = input.read(buffer)) >= 0) {
      data.write(buffer, 0, read);
    }
    return new String(data.toByteArray(), StandardCharsets.UTF_8);
  }
}
