/**
* 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.resourcemanager;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Set;

import org.apache.hadoop.net.Node;
import org.apache.hadoop.yarn.api.records.ApplicationId;
import org.apache.hadoop.yarn.api.records.Container;
import org.apache.hadoop.yarn.api.records.ContainerId;
import org.apache.hadoop.yarn.api.records.NodeId;
import org.apache.hadoop.yarn.api.records.NodeState;
import org.apache.hadoop.yarn.api.records.Resource;
import org.apache.hadoop.yarn.api.records.ResourceUtilization;
import org.apache.hadoop.yarn.factories.RecordFactory;
import org.apache.hadoop.yarn.factory.providers.RecordFactoryProvider;
import org.apache.hadoop.yarn.nodelabels.CommonNodeLabelsManager;
import org.apache.hadoop.yarn.server.api.protocolrecords.NodeHeartbeatResponse;
import org.apache.hadoop.yarn.server.resourcemanager.nodelabels.RMNodeLabelsManager;
import org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNode;
import org.apache.hadoop.yarn.server.resourcemanager.rmnode.UpdatedContainerInfo;

import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Lists;

/**
 * Test helper to generate mock nodes
 */
public class MockNodes {
  private static int NODE_ID = 0;
  private static RecordFactory recordFactory = RecordFactoryProvider.getRecordFactory(null);

  public static List<RMNode> newNodes(int racks, int nodesPerRack,
                                        Resource perNode) {
    List<RMNode> list = Lists.newArrayList();
    for (int i = 0; i < racks; ++i) {
      for (int j = 0; j < nodesPerRack; ++j) {
        if (j == (nodesPerRack - 1)) {
          // One unhealthy node per rack.
          list.add(nodeInfo(i, perNode, NodeState.UNHEALTHY));
        }
        if (j == 0) {
          // One node with label
          list.add(nodeInfo(i, perNode, NodeState.RUNNING, ImmutableSet.of("x")));
        } else {
          list.add(newNodeInfo(i, perNode));
        }
      }
    }
    return list;
  }
  
  public static List<RMNode> deactivatedNodes(int racks, int nodesPerRack,
      Resource perNode) {
    List<RMNode> list = Lists.newArrayList();
    for (int i = 0; i < racks; ++i) {
      for (int j = 0; j < nodesPerRack; ++j) {
        NodeState[] allStates = NodeState.values();
        list.add(nodeInfo(i, perNode, allStates[j % allStates.length]));
      }
    }
    return list;
  }

  public static Resource newResource(int mem) {
    Resource rs = recordFactory.newRecordInstance(Resource.class);
    rs.setMemory(mem);
    return rs;
  }

  public static Resource newUsedResource(Resource total) {
    Resource rs = recordFactory.newRecordInstance(Resource.class);
    rs.setMemory((int)(Math.random() * total.getMemory()));
    return rs;
  }

  public static Resource newAvailResource(Resource total, Resource used) {
    Resource rs = recordFactory.newRecordInstance(Resource.class);
    rs.setMemory(total.getMemory() - used.getMemory());
    return rs;
  }

  private static class MockRMNodeImpl implements RMNode {
    private NodeId nodeId;
    private String hostName;
    private String nodeAddr;
    private String httpAddress;
    private int cmdPort;
    private Resource perNode;
    private String rackName;
    private String healthReport;
    private long lastHealthReportTime;
    private NodeState state;
    private Set<String> labels;
    private ResourceUtilization containersUtilization;
    private ResourceUtilization nodeUtilization;

    public MockRMNodeImpl(NodeId nodeId, String nodeAddr, String httpAddress,
        Resource perNode, String rackName, String healthReport,
        long lastHealthReportTime, int cmdPort, String hostName, NodeState state,
        Set<String> labels, ResourceUtilization containersUtilization,
        ResourceUtilization nodeUtilization) {
      this.nodeId = nodeId;
      this.nodeAddr = nodeAddr;
      this.httpAddress = httpAddress;
      this.perNode = perNode;
      this.rackName = rackName;
      this.healthReport = healthReport;
      this.lastHealthReportTime = lastHealthReportTime;
      this.cmdPort = cmdPort;
      this.hostName = hostName;
      this.state = state;
      this.labels = labels;
      this.containersUtilization = containersUtilization;
      this.nodeUtilization = nodeUtilization;
    }

    @Override
    public NodeId getNodeID() {
      return this.nodeId;
    }

    @Override
    public String getHostName() {
      return this.hostName;
    }

    @Override
    public int getCommandPort() {
      return this.cmdPort;
    }

    @Override
    public int getHttpPort() {
      return 0;
    }

    @Override
    public String getNodeAddress() {
      return this.nodeAddr;
    }

    @Override
    public String getHttpAddress() {
      return this.httpAddress;
    }

    @Override
    public Resource getTotalCapability() {
      return this.perNode;
    }

    @Override
    public String getRackName() {
      return this.rackName;
    }

    @Override
    public Node getNode() {
      throw new UnsupportedOperationException("Not supported yet.");
    }

    @Override
    public NodeState getState() {
      return this.state;
    }

    @Override
    public List<ContainerId> getContainersToCleanUp() {
      return null;
    }

    @Override
    public List<ApplicationId> getAppsToCleanup() {
      return null;
    }

    @Override
    public List<ApplicationId> getRunningApps() {
      return null;
    }

    @Override
    public void updateNodeHeartbeatResponseForCleanup(NodeHeartbeatResponse response) {
    }

    @Override
    public NodeHeartbeatResponse getLastNodeHeartBeatResponse() {
      return null;
    }

    @Override
    public void resetLastNodeHeartBeatResponse() {
    }

    @Override
    public String getNodeManagerVersion() {
      return null;
    }

    @Override
    public List<UpdatedContainerInfo> pullContainerUpdates() {
      return new ArrayList<UpdatedContainerInfo>();
    }

    @Override
    public String getHealthReport() {
      return healthReport;
    }

    @Override
    public long getLastHealthReportTime() {
      return lastHealthReportTime;
    }

    @Override
    public Set<String> getNodeLabels() {
      if (labels != null) {
        return labels;
      }
      return CommonNodeLabelsManager.EMPTY_STRING_SET;
    }

    @Override
    public void updateNodeHeartbeatResponseForContainersDecreasing(
        NodeHeartbeatResponse response) {
      
    }

    @Override
    public List<Container> pullNewlyIncreasedContainers() {
      return Collections.emptyList();
    }

    @Override
    public ResourceUtilization getAggregatedContainersUtilization() {
      return this.containersUtilization;
    }

    @Override
    public ResourceUtilization getNodeUtilization() {
      return this.nodeUtilization;
    }
  };

  private static RMNode buildRMNode(int rack, final Resource perNode,
      NodeState state, String httpAddr) {
    return buildRMNode(rack, perNode, state, httpAddr, null);
  }
  
  private static RMNode buildRMNode(int rack, final Resource perNode,
      NodeState state, String httpAddr, Set<String> labels) {
    return buildRMNode(rack, perNode, state, httpAddr, NODE_ID++, null, 123,
        labels, null, null);
  }
  
  private static RMNode buildRMNode(int rack, final Resource perNode,
      NodeState state, String httpAddr, int hostnum, String hostName, int port) {
    return buildRMNode(rack, perNode, state, httpAddr, hostnum, hostName, port,
        null, null, null);
  }

  private static RMNode buildRMNode(int rack, final Resource perNode,
      NodeState state, String httpAddr, int hostnum, String hostName, int port,
      Set<String> labels, ResourceUtilization containersUtilization,
      ResourceUtilization nodeUtilization) {
    final String rackName = "rack"+ rack;
    final int nid = hostnum;
    final String nodeAddr = hostName + ":" + nid;
    if (hostName == null) {
      hostName = "host"+ nid;
    }
    final NodeId nodeID = NodeId.newInstance(hostName, port);

    final String httpAddress = httpAddr;
    String healthReport = (state == NodeState.UNHEALTHY) ? null : "HealthyMe";
    return new MockRMNodeImpl(nodeID, nodeAddr, httpAddress, perNode,
        rackName, healthReport, 0, nid, hostName, state, labels,
        containersUtilization, nodeUtilization);
  }

  public static RMNode nodeInfo(int rack, final Resource perNode,
      NodeState state) {
    return buildRMNode(rack, perNode, state, "N/A");
  }
  
  public static RMNode nodeInfo(int rack, final Resource perNode,
      NodeState state, Set<String> labels) {
    return buildRMNode(rack, perNode, state, "N/A", labels);
  }

  public static RMNode newNodeInfo(int rack, final Resource perNode) {
    return buildRMNode(rack, perNode, NodeState.RUNNING, "localhost:0");
  }

  public static RMNode newNodeInfo(int rack, final Resource perNode, int hostnum) {
    return buildRMNode(rack, perNode, null, "localhost:0", hostnum, null, 123);
  }
  
  public static RMNode newNodeInfo(int rack, final Resource perNode,
      int hostnum, String hostName) {
    return buildRMNode(rack, perNode, null, "localhost:0", hostnum, hostName, 123);
  }

  public static RMNode newNodeInfo(int rack, final Resource perNode,
      int hostnum, String hostName, int port) {
    return buildRMNode(rack, perNode, null, "localhost:0", hostnum, hostName, port);
  }

}