/*
    * 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.route.context;
  
  import lombok.EqualsAndHashCode;
  import lombok.Getter;
  import lombok.ToString;
  import org.apache.shardingsphere.infra.exception.ShardingSpherePreconditions;
  
  import java.util.Collection;
  import java.util.HashSet;
  import java.util.Optional;
  import java.util.Set;
  import java.util.stream.Collectors;
  
  /**
   * Route unit.
   */
  @Getter
  @EqualsAndHashCode
  @ToString
  public final class RouteUnit {
      
      private final RouteMapper dataSourceMapper;
      
      private final Collection<RouteMapper> tableMappers;
      
      public RouteUnit(final RouteMapper dataSourceMapper, final Collection<RouteMapper> tableMappers) {
          ShardingSpherePreconditions.checkNotNull(dataSourceMapper, () -> new IllegalArgumentException("`dataSourceMapper` is required"));
          ShardingSpherePreconditions.checkNotNull(tableMappers, () -> new IllegalArgumentException("`tableMappers` is required"));
          this.dataSourceMapper = dataSourceMapper;
          this.tableMappers = tableMappers;
      }
      
      /**
       * Get logic table names.
       *
       * @return logic table names
       */
      public Set<String> getLogicTableNames() {
          return tableMappers.stream().map(RouteMapper::getLogicName).collect(Collectors.toCollection(() -> new HashSet<>(tableMappers.size(), 1L)));
      }
      
      /**
       * Get actual table names.
       *
       * @param logicTableName logic table name
       * @return actual table names
       */
      public Set<String> getActualTableNames(final String logicTableName) {
          return tableMappers.stream().filter(each -> logicTableName.equalsIgnoreCase(each.getLogicName())).map(RouteMapper::getActualName).collect(Collectors.toSet());
      }
      
      /**
       * Find table mapper.
       *
       * @param logicDataSourceName logic data source name
       * @param actualTableName actual table name
       * @return table mapper
       */
      public Optional<RouteMapper> findTableMapper(final String logicDataSourceName, final String actualTableName) {
          for (RouteMapper each : tableMappers) {
              if (logicDataSourceName.equalsIgnoreCase(dataSourceMapper.getLogicName()) && actualTableName.equalsIgnoreCase(each.getActualName())) {
                  return Optional.of(each);
              }
          }
          return Optional.empty();
      }
  }