/*
    * 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.shardingsphere.infra.instance;
  
  import lombok.AccessLevel;
  import lombok.Getter;
  import lombok.RequiredArgsConstructor;
  import org.apache.shardingsphere.infra.config.mode.ModeConfiguration;
  import org.apache.shardingsphere.infra.instance.metadata.InstanceMetaData;
  import org.apache.shardingsphere.infra.instance.metadata.InstanceType;
  import org.apache.shardingsphere.infra.instance.mode.ModeContextManager;
  import org.apache.shardingsphere.infra.instance.workerid.WorkerIdGenerator;
  import org.apache.shardingsphere.infra.lock.LockContext;
  import org.apache.shardingsphere.infra.util.eventbus.EventBusContext;
  
  import java.util.Collection;
  import java.util.LinkedHashMap;
  import java.util.LinkedList;
  import java.util.Map;
  import java.util.Optional;
  import java.util.Properties;
  
  /**
   * Instance context.
   */
  @RequiredArgsConstructor
  @Getter
  public final class InstanceContext {
      
      private final ComputeNodeInstance instance;
      
      @Getter(AccessLevel.NONE)
      private final WorkerIdGenerator workerIdGenerator;
      
      private final ModeConfiguration modeConfiguration;
      
      private final ModeContextManager modeContextManager;
      
      @SuppressWarnings("rawtypes")
      private final LockContext lockContext;
      
      private final EventBusContext eventBusContext;
      
      private final Collection<ComputeNodeInstance> allClusterInstances = new LinkedList<>();
      
      /**
       * Update instance status.
       *
       * @param instanceId instance id
       * @param status status
       */
      public void updateInstanceStatus(final String instanceId, final String status) {
          if (instance.getMetaData().getId().equals(instanceId)) {
              instance.switchState(status);
          }
          updateRelatedComputeNodeInstancesStatus(instanceId, status);
      }
      
      private void updateRelatedComputeNodeInstancesStatus(final String instanceId, final String status) {
          for (ComputeNodeInstance each : allClusterInstances) {
              if (each.getMetaData().getId().equals(instanceId)) {
                  each.switchState(status);
              }
          }
      }
      
      /**
       * Update instance worker id.
       *
       * @param instanceId instance id
       * @param workerId worker id
       */
      public void updateWorkerId(final String instanceId, final Integer workerId) {
          if (instance.getMetaData().getId().equals(instanceId)) {
              instance.setWorkerId(workerId);
          }
          allClusterInstances.stream().filter(each -> each.getMetaData().getId().equals(instanceId)).forEach(each -> each.setWorkerId(workerId));
      }
      
      /**
       * Update instance label.
       * 
       * @param instanceId instance id
       * @param labels collection of label
      */
     public void updateLabel(final String instanceId, final Collection<String> labels) {
         if (instance.getMetaData().getId().equals(instanceId)) {
             instance.setLabels(labels);
         }
         allClusterInstances.stream().filter(each -> each.getMetaData().getId().equals(instanceId)).forEach(each -> each.setLabels(labels));
     }
     
     /**
      * Get worker id.
      *
      * @return worker id
      */
     public int getWorkerId() {
         return instance.getWorkerId();
     }
     
     /**
      * Generate worker id.
      *
      * @param props properties
      * @return worker id
      */
     public int generateWorkerId(final Properties props) {
         int result = workerIdGenerator.generate(props);
         instance.setWorkerId(result);
         return result;
     }
     
     /**
      * Add compute node instance.
      * 
      * @param instance compute node instance
      */
     public void addComputeNodeInstance(final ComputeNodeInstance instance) {
         allClusterInstances.removeIf(each -> each.getMetaData().getId().equalsIgnoreCase(instance.getMetaData().getId()));
         allClusterInstances.add(instance);
     }
     
     /**
      * Delete compute node instance.
      *
      * @param instance compute node instance
      */
     public void deleteComputeNodeInstance(final ComputeNodeInstance instance) {
         allClusterInstances.removeIf(each -> each.getMetaData().getId().equalsIgnoreCase(instance.getMetaData().getId()));
     }
     
     /**
      * Get compute node instances by instance type and labels.
      *
      * @param instanceType instance type
      * @param labels collection of contained label
      * @return compute node instances
      */
     public Map<String, InstanceMetaData> getAllClusterInstances(final InstanceType instanceType, final Collection<String> labels) {
         Map<String, InstanceMetaData> result = new LinkedHashMap<>(allClusterInstances.size(), 1F);
         for (ComputeNodeInstance each : allClusterInstances) {
             if (each.getMetaData().getType() == instanceType && labels.stream().anyMatch(((Collection<String>) each.getLabels())::contains)) {
                 result.put(each.getMetaData().getId(), each.getMetaData());
             }
         }
         return result;
     }
     
     /**
      * Get compute node instance by instance id.
      * 
      * @param instanceId instance id
      * @return compute node instance
      */
     public Optional<ComputeNodeInstance> getComputeNodeInstanceById(final String instanceId) {
         return allClusterInstances.stream().filter(each -> instanceId.equals(each.getCurrentInstanceId())).findFirst();
     }
     
     /**
      * Is cluster instance or not.
      * 
      * @return true if is cluster, else false
      */
     public boolean isCluster() {
         return "Cluster".equals(modeConfiguration.getType());
     }
 }