/*
    * 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.session.connection;
  
  import lombok.AccessLevel;
  import lombok.Getter;
  import lombok.RequiredArgsConstructor;
  import lombok.Setter;
  import org.apache.shardingsphere.infra.session.connection.cursor.CursorConnectionContext;
  import org.apache.shardingsphere.infra.session.connection.datasource.UsedDataSourceProvider;
  import org.apache.shardingsphere.infra.session.connection.transaction.TransactionConnectionContext;
  
  import java.util.Collection;
  import java.util.Collections;
  import java.util.HashSet;
  import java.util.Optional;
  
  /**
   * Connection context.
   */
  @RequiredArgsConstructor
  @Getter
  public final class ConnectionContext implements AutoCloseable {
      
      private final CursorConnectionContext cursorContext = new CursorConnectionContext();
      
      private final TransactionConnectionContext transactionContext = new TransactionConnectionContext();
      
      @Getter(AccessLevel.NONE)
      private final UsedDataSourceProvider usedDataSourceProvider;
      
      private String databaseName;
      
      @Setter
      private String trafficInstanceId;
      
      public ConnectionContext() {
          this(Collections::emptySet);
      }
      
      /**
       * Get used data source names.
       *
       * @return used data source names
       */
      public Collection<String> getUsedDataSourceNames() {
          Collection<String> result = new HashSet<>(usedDataSourceProvider.getNames().size(), 1F);
          for (String each : usedDataSourceProvider.getNames()) {
              result.add(each.contains(".") ? each.split("\\.")[1] : each);
          }
          return result;
      }
      
      /**
       * Get traffic instance ID.
       *
       * @return traffic instance ID
       */
      public Optional<String> getTrafficInstanceId() {
          return Optional.ofNullable(trafficInstanceId);
      }
      
      /**
       * Clear cursor connection context.
       */
      public void clearCursorContext() {
          cursorContext.close();
      }
      
      /**
       * Clear transaction connection context.
       */
      public void clearTransactionContext() {
          transactionContext.close();
      }
      
      /**
       * Set current database name.
       *
       * @param databaseName database name
       */
      public void setCurrentDatabase(final String databaseName) {
          if (null != databaseName && !databaseName.equals(this.databaseName)) {
              this.databaseName = databaseName;
         }
     }
     
     /**
      * Get database name.
      *
      * @return database name
      */
     public Optional<String> getDatabaseName() {
         return Optional.ofNullable(databaseName);
     }
     
     @Override
     public void close() {
         trafficInstanceId = null;
         clearCursorContext();
         clearTransactionContext();
     }
 }