/*
    * 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.checker.DatabaseRuleConfigurationEmptyChecker;
  import org.apache.shardingsphere.infra.config.rule.scope.DatabaseRuleConfiguration;
  import org.apache.shardingsphere.infra.metadata.database.ShardingSphereDatabase;
  import org.apache.shardingsphere.infra.rule.attribute.datasource.StaticDataSourceRuleAttribute;
  import org.apache.shardingsphere.infra.spi.type.typed.TypedSPILoader;
  import org.apache.shardingsphere.infra.yaml.config.pojo.rule.YamlRuleConfiguration;
  import org.apache.shardingsphere.infra.yaml.config.swapper.rule.YamlRuleConfigurationSwapperEngine;
  import org.apache.shardingsphere.mode.manager.ContextManager;
  import org.apache.shardingsphere.mode.node.rule.tuple.annotation.RuleNodeTupleEntity;
  import org.apache.shardingsphere.mode.persist.service.MetaDataManagerPersistService;
  
  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 void operate(final DatabaseRuleDefinitionStatement sqlStatement, final ShardingSphereDatabase database, final RuleConfiguration currentRuleConfig) {
          if (!executor.hasAnyOneToBeDropped(sqlStatement)) {
              return;
          }
          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
          }
          MetaDataManagerPersistService metaDataManagerPersistService = contextManager.getPersistServiceFacade().getModeFacade().getMetaDataManagerService();
          RuleConfiguration toBeDroppedRuleItemConfig = executor.buildToBeDroppedRuleConfiguration(sqlStatement);
          metaDataManagerPersistService.removeRuleConfigurationItem(database, toBeDroppedRuleItemConfig);
          RuleConfiguration toBeAlteredRuleConfig = executor.buildToBeAlteredRuleConfiguration(sqlStatement);
          if (null != toBeAlteredRuleConfig
                  && TypedSPILoader.getService(DatabaseRuleConfigurationEmptyChecker.class, toBeAlteredRuleConfig.getClass()).isEmpty((DatabaseRuleConfiguration) toBeAlteredRuleConfig)) {
              YamlRuleConfiguration yamlRuleConfig = new YamlRuleConfigurationSwapperEngine().swapToYamlRuleConfiguration(currentRuleConfig);
              metaDataManagerPersistService.removeRuleConfiguration(database, currentRuleConfig, Objects.requireNonNull(yamlRuleConfig.getClass().getAnnotation(RuleNodeTupleEntity.class)).value());
          } else {
              metaDataManagerPersistService.alterRuleConfiguration(database, toBeAlteredRuleConfig);
          }
      }
  }