/*
    * 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.metadata.database.schema.reviser.schema;
  
  import lombok.RequiredArgsConstructor;
  import org.apache.shardingsphere.infra.config.props.ConfigurationProperties;
  import org.apache.shardingsphere.infra.database.core.type.DatabaseType;
  import org.apache.shardingsphere.infra.metadata.database.schema.reviser.table.TableMetaDataReviseEngine;
  import org.apache.shardingsphere.infra.metadata.database.schema.reviser.MetaDataReviseEntry;
  import org.apache.shardingsphere.infra.database.core.metadata.data.model.SchemaMetaData;
  import org.apache.shardingsphere.infra.database.core.metadata.data.model.TableMetaData;
  import org.apache.shardingsphere.infra.rule.ShardingSphereRule;
  import org.apache.shardingsphere.infra.spi.type.ordered.OrderedSPILoader;
  
  import javax.sql.DataSource;
  import java.util.Collection;
  import java.util.Map.Entry;
  import java.util.Optional;
  import java.util.stream.Collectors;
  
  /**
   * Schema meta data revise engine.
   */
  @RequiredArgsConstructor
  public final class SchemaMetaDataReviseEngine {
      
      private final Collection<ShardingSphereRule> rules;
      
      private final ConfigurationProperties props;
      
      private final DatabaseType databaseType;
      
      private final DataSource dataSource;
      
      /**
       * Revise schema meta data.
       * 
       * @param originalMetaData original schema meta data
       * @return revised schema meta data
       */
      @SuppressWarnings({"rawtypes", "unchecked"})
      public SchemaMetaData revise(final SchemaMetaData originalMetaData) {
          SchemaMetaData result = originalMetaData;
          for (Entry<ShardingSphereRule, MetaDataReviseEntry> entry : OrderedSPILoader.getServices(MetaDataReviseEntry.class, rules).entrySet()) {
              result = revise(result, entry.getKey(), entry.getValue());
          }
          return result;
      }
      
      private <T extends ShardingSphereRule> SchemaMetaData revise(final SchemaMetaData originalMetaData, final T rule, final MetaDataReviseEntry<T> reviseEntry) {
          TableMetaDataReviseEngine<T> tableMetaDataReviseEngine = new TableMetaDataReviseEngine<>(rule, databaseType, dataSource, reviseEntry);
          Optional<? extends SchemaTableAggregationReviser<T>> aggregationReviser = reviseEntry.getSchemaTableAggregationReviser(props);
          if (!aggregationReviser.isPresent()) {
              return new SchemaMetaData(originalMetaData.getName(), originalMetaData.getTables().stream().map(tableMetaDataReviseEngine::revise).collect(Collectors.toList()));
          }
          for (TableMetaData each : originalMetaData.getTables()) {
              aggregationReviser.get().add(tableMetaDataReviseEngine.revise(each));
          }
          return new SchemaMetaData(originalMetaData.getName(), aggregationReviser.get().aggregate(rule));
      }
  }