/*
    * 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;
  
  import lombok.AccessLevel;
  import lombok.Getter;
  import lombok.SneakyThrows;
  import org.apache.shardingsphere.database.connector.core.type.DatabaseType;
  import org.apache.shardingsphere.infra.config.props.ConfigurationProperties;
  import org.apache.shardingsphere.infra.config.props.temporary.TemporaryConfigurationProperties;
  import org.apache.shardingsphere.infra.datasource.pool.destroyer.DataSourcePoolDestroyer;
  import org.apache.shardingsphere.infra.metadata.database.ShardingSphereDatabase;
  import org.apache.shardingsphere.infra.metadata.database.ShardingSphereDatabaseFactory;
  import org.apache.shardingsphere.infra.metadata.database.resource.ResourceMetaData;
  import org.apache.shardingsphere.infra.metadata.database.rule.RuleMetaData;
  import org.apache.shardingsphere.infra.metadata.identifier.ShardingSphereIdentifier;
  import org.apache.shardingsphere.infra.rule.ShardingSphereRule;
  import org.apache.shardingsphere.infra.rule.attribute.datasource.StaticDataSourceRuleAttribute;
  import org.apache.shardingsphere.infra.rule.scope.GlobalRule;
  import org.apache.shardingsphere.infra.rule.scope.GlobalRule.GlobalRuleChangedType;
  
  import java.util.Collection;
  import java.util.Collections;
  import java.util.LinkedList;
  import java.util.Map;
  import java.util.Optional;
  import java.util.Properties;
  import java.util.concurrent.ConcurrentHashMap;
  import java.util.stream.Collectors;
  
  /**
   * ShardingSphere meta data.
   */
  @Getter
  public final class ShardingSphereMetaData implements AutoCloseable {
      
      @Getter(AccessLevel.NONE)
      private final Map<ShardingSphereIdentifier, ShardingSphereDatabase> databases;
      
      private final ResourceMetaData globalResourceMetaData;
      
      private final RuleMetaData globalRuleMetaData;
      
      private final ConfigurationProperties props;
      
      private final TemporaryConfigurationProperties temporaryProps;
      
      public ShardingSphereMetaData() {
          this(Collections.emptyList(), new ResourceMetaData(Collections.emptyMap()), new RuleMetaData(Collections.emptyList()), new ConfigurationProperties(new Properties()));
      }
      
      public ShardingSphereMetaData(final Collection<ShardingSphereDatabase> databases, final ResourceMetaData globalResourceMetaData,
                                    final RuleMetaData globalRuleMetaData, final ConfigurationProperties props) {
          this.databases = new ConcurrentHashMap<>(databases.stream().collect(Collectors.toMap(each -> new ShardingSphereIdentifier(each.getName()), each -> each)));
          this.globalResourceMetaData = globalResourceMetaData;
          this.globalRuleMetaData = globalRuleMetaData;
          this.props = props;
          temporaryProps = new TemporaryConfigurationProperties(props.getProps());
      }
      
      /**
       * Get all databases.
       *
       * @return all databases
       */
      public Collection<ShardingSphereDatabase> getAllDatabases() {
          return databases.values();
      }
      
      /**
       * Judge contains database from meta data or not.
       *
       * @param databaseName database name
       * @return contains database from meta data or not
       */
      public boolean containsDatabase(final String databaseName) {
          return databases.containsKey(new ShardingSphereIdentifier(databaseName));
      }
      
      /**
       * Get database.
       *
       * @param databaseName database name
       * @return meta data database
      */
     public ShardingSphereDatabase getDatabase(final String databaseName) {
         return databases.get(new ShardingSphereIdentifier(databaseName));
     }
     
     /**
      * Add database.
      *
      * @param databaseName database name
      * @param protocolType protocol database type
      * @param props configuration properties
      */
     public void addDatabase(final String databaseName, final DatabaseType protocolType, final ConfigurationProperties props) {
         ShardingSphereDatabase database = ShardingSphereDatabaseFactory.create(databaseName, protocolType, props);
         databases.put(new ShardingSphereIdentifier(database.getName()), database);
         globalRuleMetaData.getRules().forEach(each -> ((GlobalRule) each).refresh(databases.values(), GlobalRuleChangedType.DATABASE_CHANGED));
     }
     
     /**
      * Put database.
      *
      * @param database database
      */
     public void putDatabase(final ShardingSphereDatabase database) {
         databases.put(new ShardingSphereIdentifier(database.getName()), database);
     }
     
     /**
      * Drop database.
      *
      * @param databaseName database name
      */
     public void dropDatabase(final String databaseName) {
         cleanResources(databases.remove(new ShardingSphereIdentifier(databaseName)));
     }
     
     @SneakyThrows(Exception.class)
     private void cleanResources(final ShardingSphereDatabase database) {
         globalRuleMetaData.getRules().forEach(each -> ((GlobalRule) each).refresh(databases.values(), GlobalRuleChangedType.DATABASE_CHANGED));
         for (ShardingSphereRule each : database.getRuleMetaData().getRules()) {
             if (each instanceof AutoCloseable) {
                 ((AutoCloseable) each).close();
             }
         }
         database.getRuleMetaData().getAttributes(StaticDataSourceRuleAttribute.class).forEach(StaticDataSourceRuleAttribute::cleanStorageNodeDataSources);
         Optional.ofNullable(database.getResourceMetaData())
                 .ifPresent(optional -> optional.getStorageUnits().values().forEach(each -> new DataSourcePoolDestroyer(each.getDataSource()).asyncDestroy()));
     }
     
     @SneakyThrows(Exception.class)
     @Override
     public void close() {
         for (ShardingSphereRule each : getAllRules()) {
             if (each instanceof AutoCloseable) {
                 ((AutoCloseable) each).close();
             }
         }
     }
     
     private Collection<ShardingSphereRule> getAllRules() {
         Collection<ShardingSphereRule> result = new LinkedList<>(globalRuleMetaData.getRules());
         getAllDatabases().stream().map(each -> each.getRuleMetaData().getRules()).forEach(result::addAll);
         return result;
     }
 }