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   * Licensed to the Apache Software Foundation (ASF) under one
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   * 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.cassandra.simulator.cluster;
  
  import java.net.InetSocketAddress;
  import java.util.AbstractMap;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Map;
  import java.util.stream.Collectors;
  
  import org.apache.cassandra.dht.Range;
  import org.apache.cassandra.dht.Token;
  import org.apache.cassandra.distributed.Cluster;
  import org.apache.cassandra.distributed.api.IInvokableInstance;
  import org.apache.cassandra.locator.Replica;
  import org.apache.cassandra.schema.KeyspaceMetadata;
  import org.apache.cassandra.simulator.Action;
  import org.apache.cassandra.simulator.ActionList;
  import org.apache.cassandra.simulator.Actions;
  import org.apache.cassandra.simulator.cluster.OnInstanceRepair.RepairType;
  import org.apache.cassandra.tcm.ClusterMetadata;
  import org.apache.cassandra.tcm.ClusterMetadataService;
  import org.apache.cassandra.tcm.MultiStepOperation;
  import org.apache.cassandra.tcm.Transformation;
  import org.apache.cassandra.tcm.membership.NodeId;
  import org.apache.cassandra.tcm.sequences.BootstrapAndReplace;
  import org.apache.cassandra.tcm.sequences.ReconfigureCMS;
  import org.apache.cassandra.tcm.transformations.PrepareReplace;
  
  import static org.apache.cassandra.simulator.Action.Modifiers.NONE;
  import static org.apache.cassandra.simulator.Action.Modifiers.STRICT;
  import static org.apache.cassandra.utils.FBUtilities.getBroadcastAddressAndPort;
  import static org.apache.cassandra.utils.LazyToString.lazy;
  
  class OnClusterReplace extends OnClusterChangeTopology
  {
      final int leaving;
      final int joining;
      final Topology during;
  
      OnClusterReplace(KeyspaceActions actions, Topology before, Topology during, Topology after, int leaving, int joining)
      {
          super(lazy(() -> String.format("node%d Replacing node%d", joining, leaving)), actions, STRICT, NONE, before, after, during.pendingKeys());
          this.leaving = leaving;
          this.joining = joining;
          this.during = during;
      }
  
      public ActionList performSimple()
      {
          IInvokableInstance joinInstance = actions.cluster.get(joining);
          before(joinInstance);
          int leavingNodeId = actions.cluster.get(leaving).unsafeCallOnThisThread(() -> ClusterMetadata.current().myNodeId().id());
          List<Action> actionList = new ArrayList<>();
          actionList.add(new SubmitPrepareReplace(actions, leavingNodeId, joining));
          actionList.add(new OnInstanceTopologyChangePaxosRepair(actions, joining, "Replace"));
  
          actionList.add(Actions.of(Modifiers.STRICT, Modifiers.RELIABLE_NO_TIMEOUTS, "Start Replace", () -> {
              List<Action> local = new ArrayList<>();
  
              List<Map.Entry<String, String>> repairRanges = actions.cluster.get(leaving).unsafeApplyOnThisThread(
              (String keyspaceName) -> {
                  ClusterMetadata metadata = ClusterMetadata.current();
                  return metadata.placements.get(metadata.schema.getKeyspace(keyspaceName).getMetadata().params.replication)
                         .writes.ranges()
                                .stream()
                                .map(OnClusterReplace::toStringEntry)
                                .collect(Collectors.toList());
              }, actions.keyspace);
  
  
              Map<InetSocketAddress, IInvokableInstance> lookup = Cluster.getUniqueAddressLookup(actions.cluster);
  
              int[] others = repairRanges.stream().mapToInt(
              repairRange -> lookup.get(actions.cluster.get(leaving).unsafeApplyOnThisThread(
                                        (String keyspaceName, String tk) -> {
                                            ClusterMetadata metadata = ClusterMetadata.current();
                                            KeyspaceMetadata keyspaceMetadata = metadata.schema.getKeyspaces().getNullable(keyspaceName);
                                            return metadata.placements.get(keyspaceMetadata.params.replication).reads
                                                   .forToken(Utils.parseToken(tk))
                                                   .get()
                                                   .stream().map(Replica::endpoint)
                                                   .filter(i -> !i.equals(getBroadcastAddressAndPort()))
                                                   .findFirst()
                                                   .orElseThrow(IllegalStateException::new);
                                        },
                                        actions.keyspace, repairRange.getValue())
              ).config().num()
              ).toArray();
  
              local.add(new OnClusterMarkDown(actions, leaving));
              local.add(new OnClusterRepairRanges(actions, others, RepairType.DATA_AND_PAXOS_FULL, repairRanges, true));
              local.add(new ExecuteNextStep(actions, joining, Transformation.Kind.START_REPLACE));
              local.addAll(Quiesce.all(actions));
              return ActionList.of(local);
          }));
  
          actionList.add(Actions.of(Modifiers.STRICT, Modifiers.RELIABLE_NO_TIMEOUTS, "Mid Replace", () -> {
              List<Action> local = new ArrayList<>();
              local.add(new ExecuteNextStep(actions, joining, Transformation.Kind.MID_REPLACE));
              local.addAll(Quiesce.all(actions));
              return ActionList.of(local);
          }));
  
          actionList.add(Actions.of(Modifiers.STRICT, Modifiers.RELIABLE_NO_TIMEOUTS, "Finish Replace", () -> {
              List<Action> local = new ArrayList<>();
              local.add(new ExecuteNextStep(actions, joining, Transformation.Kind.FINISH_REPLACE));
              local.addAll(Quiesce.all(actions));
              return ActionList.of(local);
          }));
  
          return ActionList.of(actionList);
      }
  
      private static class SubmitPrepareReplace extends ClusterReliableAction
      {
          public SubmitPrepareReplace(ClusterActions actions, int leavingNodeId, int joining)
          {
              super("Prepare Replace", actions, joining, () -> {
                  ClusterMetadata metadata = ClusterMetadata.current();
                  NodeId leaving = new NodeId(leavingNodeId);
                  ReconfigureCMS.maybeReconfigureCMS(metadata, metadata.directory.endpoint(leaving));
  
                  metadata = ClusterMetadata.current();
                  ClusterMetadataService.instance().commit(new PrepareReplace(leaving,
                                                                              metadata.myNodeId(),
                                                                              ClusterMetadataService.instance().placementProvider(),
                                                                              true,
                                                                              true));
              });
          }
      }
  
      private static class ExecuteNextStep extends ClusterReliableAction
      {
          private ExecuteNextStep(ClusterActions actions, int on, Transformation.Kind kind)
          {
              this(actions, on, kind.ordinal());
          }
  
          private ExecuteNextStep(ClusterActions actions, int on, int kind)
          {
              super(String.format("Execute next step of the replace operation: %s", Transformation.Kind.values()[kind]), actions, on, () -> {
                  ClusterMetadata metadata = ClusterMetadata.current();
                  MultiStepOperation<?> sequence = metadata.inProgressSequences.get(metadata.myNodeId());
  
                  if (!(sequence instanceof BootstrapAndReplace))
                      throw new IllegalStateException(String.format("Can not resume replace as it does not appear to have been started. Found: %s", sequence));
  
                  BootstrapAndReplace bootstrapAndReplace = ((BootstrapAndReplace) sequence);
                  assert bootstrapAndReplace.next.ordinal() == kind : String.format("Expected next step to be %s, but got %s", Transformation.Kind.values()[kind], bootstrapAndReplace.next);
                  boolean res = bootstrapAndReplace.executeNext().isContinuable();
                  assert res;
              });
          }
      }
  
      static Map.Entry<String, String> toStringEntry(Range<Token> range)
      {
          return new AbstractMap.SimpleImmutableEntry<>(range.left.toString(), range.right.toString());
      }
  }
  