/*
    * 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.distsql.handler.engine.update.rdl.rule.engine.database.type;
  
  import lombok.RequiredArgsConstructor;
  import org.apache.shardingsphere.distsql.handler.engine.update.rdl.rule.engine.database.DatabaseRuleOperator;
  import org.apache.shardingsphere.distsql.handler.engine.update.rdl.rule.spi.database.DatabaseRuleDropExecutor;
  import org.apache.shardingsphere.distsql.statement.rdl.rule.aware.StaticDataSourceContainedRuleAwareStatement;
  import org.apache.shardingsphere.distsql.statement.rdl.rule.database.DatabaseRuleDefinitionStatement;
  import org.apache.shardingsphere.infra.config.rule.RuleConfiguration;
  import org.apache.shardingsphere.infra.config.rule.scope.DatabaseRuleConfiguration;
  import org.apache.shardingsphere.infra.instance.mode.ModeContextManager;
  import org.apache.shardingsphere.infra.metadata.database.ShardingSphereDatabase;
  import org.apache.shardingsphere.infra.metadata.version.MetaDataVersion;
  import org.apache.shardingsphere.infra.rule.attribute.datasource.StaticDataSourceRuleAttribute;
  import org.apache.shardingsphere.infra.yaml.config.pojo.rule.YamlRuleConfiguration;
  import org.apache.shardingsphere.mode.tuple.annotation.RepositoryTupleEntity;
  import org.apache.shardingsphere.infra.yaml.config.swapper.rule.YamlRuleConfigurationSwapperEngine;
  import org.apache.shardingsphere.mode.manager.ContextManager;
  
  import java.util.Collection;
  import java.util.Collections;
  import java.util.Objects;
  
  /**
   * Drop database rule operator.
   */
  @RequiredArgsConstructor
  public final class DropDatabaseRuleOperator implements DatabaseRuleOperator {
      
      private final ContextManager contextManager;
      
      @SuppressWarnings("rawtypes")
      private final DatabaseRuleDropExecutor executor;
      
      @Override
      @SuppressWarnings("unchecked")
      public Collection<MetaDataVersion> operate(final DatabaseRuleDefinitionStatement sqlStatement, final ShardingSphereDatabase database, final RuleConfiguration currentRuleConfig) {
          if (!executor.hasAnyOneToBeDropped(sqlStatement)) {
              return Collections.emptyList();
          }
          ModeContextManager modeContextManager = contextManager.getInstanceContext().getModeContextManager();
          RuleConfiguration toBeDroppedRuleConfig = executor.buildToBeDroppedRuleConfiguration(sqlStatement);
          if (sqlStatement instanceof StaticDataSourceContainedRuleAwareStatement) {
              for (StaticDataSourceRuleAttribute each : database.getRuleMetaData().getAttributes(StaticDataSourceRuleAttribute.class)) {
                  ((StaticDataSourceContainedRuleAwareStatement) sqlStatement).getNames().forEach(each::cleanStorageNodeDataSource);
              }
              // TODO refactor to new metadata refresh way
          }
          modeContextManager.removeRuleConfigurationItem(database.getName(), toBeDroppedRuleConfig);
          RuleConfiguration toBeAlteredRuleConfig = executor.buildToBeAlteredRuleConfiguration(sqlStatement);
          if (null != toBeAlteredRuleConfig && ((DatabaseRuleConfiguration) toBeAlteredRuleConfig).isEmpty()) {
              YamlRuleConfiguration yamlRuleConfig = new YamlRuleConfigurationSwapperEngine().swapToYamlRuleConfiguration(currentRuleConfig);
              modeContextManager.removeRuleConfiguration(database.getName(), Objects.requireNonNull(yamlRuleConfig.getClass().getAnnotation(RepositoryTupleEntity.class)).value());
              return Collections.emptyList();
          }
          return modeContextManager.alterRuleConfiguration(database.getName(), toBeAlteredRuleConfig);
      }
  }