/*
 * 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.uniffle.coordinator.checker;

import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Objects;

import com.google.common.collect.Lists;
import org.apache.hadoop.conf.Configuration;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

import org.apache.uniffle.common.ServerStatus;
import org.apache.uniffle.coordinator.AccessManager;
import org.apache.uniffle.coordinator.ApplicationManager;
import org.apache.uniffle.coordinator.ClusterManager;
import org.apache.uniffle.coordinator.CoordinatorConf;
import org.apache.uniffle.coordinator.ServerNode;
import org.apache.uniffle.coordinator.SimpleClusterManager;
import org.apache.uniffle.coordinator.access.AccessInfo;
import org.apache.uniffle.coordinator.access.checker.AccessClusterLoadChecker;
import org.apache.uniffle.coordinator.metric.CoordinatorMetrics;

import static org.apache.uniffle.common.util.Constants.ACCESS_INFO_REQUIRED_SHUFFLE_NODES_NUM;
import static org.apache.uniffle.coordinator.CoordinatorConf.COORDINATOR_ACCESS_CHECKERS;
import static org.apache.uniffle.coordinator.CoordinatorConf.COORDINATOR_ACCESS_LOADCHECKER_MEMORY_PERCENTAGE;
import static org.apache.uniffle.coordinator.CoordinatorConf.COORDINATOR_SHUFFLE_NODES_MAX;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

public class AccessClusterLoadCheckerTest {
  private static final String clusterLoaderCheckerName = AccessClusterLoadChecker.class.getName();

  @BeforeEach
  public void setUp() {
    CoordinatorMetrics.register();
  }

  @AfterEach
  public void clear() {
    CoordinatorMetrics.clear();
  }

  @Test
  public void testAccessInfoRequiredShuffleServers() throws Exception {
    List<ServerNode> nodes = Lists.newArrayList();
    ServerNode node1 = new ServerNode("1", "1", 0, 50, 20, 1000, 0, null);
    ServerNode node2 = new ServerNode("1", "1", 0, 50, 20, 1000, 0, null);
    nodes.add(node1);
    nodes.add(node2);

    ClusterManager clusterManager = mock(SimpleClusterManager.class);
    when(clusterManager.getServerList(any())).thenReturn(nodes);

    CoordinatorConf conf = new CoordinatorConf();
    conf.set(COORDINATOR_ACCESS_CHECKERS, Collections.singletonList(clusterLoaderCheckerName));
    conf.set(COORDINATOR_SHUFFLE_NODES_MAX, 3);
    conf.set(COORDINATOR_ACCESS_LOADCHECKER_MEMORY_PERCENTAGE, 20.0);
    try (ApplicationManager applicationManager = new ApplicationManager(conf)) {
      AccessManager accessManager =
          new AccessManager(
              conf, clusterManager, applicationManager.getQuotaManager(), new Configuration());

      AccessClusterLoadChecker accessClusterLoadChecker =
          (AccessClusterLoadChecker) accessManager.getAccessCheckers().get(0);

      /**
       * case1: when setting the invalid required shuffle nodes number of job and available servers
       * less than the COORDINATOR_SHUFFLE_NODES_MAX, it should return false
       */
      Map<String, String> properties = new HashMap<>();
      properties.put(ACCESS_INFO_REQUIRED_SHUFFLE_NODES_NUM, "-1");
      AccessInfo accessInfo = new AccessInfo("test", new HashSet<>(), properties, "user");
      assertFalse(accessClusterLoadChecker.check(accessInfo).isSuccess());

      /**
       * case2: when setting the valid required shuffle nodes number of job and available servers
       * greater than the COORDINATOR_SHUFFLE_NODES_MAX, it should return true
       */
      properties.put(ACCESS_INFO_REQUIRED_SHUFFLE_NODES_NUM, "1");
      accessInfo = new AccessInfo("test", new HashSet<>(), properties, "user");
      assertTrue(accessClusterLoadChecker.check(accessInfo).isSuccess());

      /**
       * case3: when setting the valid required shuffle nodes number of job and available servers
       * less than the COORDINATOR_SHUFFLE_NODES_MAX, it should return false
       */
      properties.put(ACCESS_INFO_REQUIRED_SHUFFLE_NODES_NUM, "100");
      accessInfo = new AccessInfo("test", new HashSet<>(), properties, "user");
      assertFalse(accessClusterLoadChecker.check(accessInfo).isSuccess());

      /**
       * case4: when the required shuffle nodes number is not specified in access info, it should
       * use the default shuffle nodes max from coordinator conf.
       */
      properties = new HashMap<>();
      accessInfo = new AccessInfo("test", new HashSet<>(), properties, "user");
      assertFalse(accessClusterLoadChecker.check(accessInfo).isSuccess());
    }
  }

  @Test
  public void testWhenAvailableServerThresholdSpecified() throws Exception {
    ClusterManager clusterManager = mock(SimpleClusterManager.class);
    List<ServerNode> serverNodeList = Lists.newArrayList();
    ServerNode node1 = new ServerNode("1", "1", 0, 50, 20, 30, 0, null, ServerStatus.UNHEALTHY);
    serverNodeList.add(node1);
    final String filePath =
        Objects.requireNonNull(getClass().getClassLoader().getResource("coordinator.conf"))
            .getFile();
    CoordinatorConf conf = new CoordinatorConf(filePath);
    conf.setString(COORDINATOR_ACCESS_CHECKERS.key(), clusterLoaderCheckerName);
    try (ApplicationManager applicationManager = new ApplicationManager(conf)) {
      AccessManager accessManager =
          new AccessManager(
              conf, clusterManager, applicationManager.getQuotaManager(), new Configuration());
      AccessClusterLoadChecker accessClusterLoadChecker =
          (AccessClusterLoadChecker) accessManager.getAccessCheckers().get(0);
      when(clusterManager.getServerList(any())).thenReturn(serverNodeList);
      assertFalse(accessClusterLoadChecker.check(new AccessInfo("test")).isSuccess());
      assertEquals(2, accessClusterLoadChecker.getAvailableServerNumThreshold());
      assertEquals(0, Double.compare(accessClusterLoadChecker.getMemoryPercentThreshold(), 20.0));
      ServerNode node2 = new ServerNode("1", "1", 0, 90, 40, 10, 0, null);
      serverNodeList.add(node2);
      ServerNode node3 = new ServerNode("1", "1", 0, 80, 25, 20, 0, null);
      serverNodeList.add(node3);
      assertFalse(accessClusterLoadChecker.check(new AccessInfo("test")).isSuccess());
      ServerNode node4 = new ServerNode("1", "1", 0, 75, 25, 25, 0, null);
      serverNodeList.add(node4);
      assertTrue(accessClusterLoadChecker.check(new AccessInfo("test")).isSuccess());
    }
  }
}