/*
    * 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.sharding.route.engine.type.complex;
  
  import lombok.RequiredArgsConstructor;
  import org.apache.shardingsphere.infra.binder.context.statement.SQLStatementContext;
  import org.apache.shardingsphere.infra.config.props.ConfigurationProperties;
  import org.apache.shardingsphere.infra.hint.HintValueContext;
  import org.apache.shardingsphere.infra.route.context.RouteContext;
  import org.apache.shardingsphere.sharding.exception.metadata.ShardingTableRuleNotFoundException;
  import org.apache.shardingsphere.sharding.route.engine.condition.ShardingConditions;
  import org.apache.shardingsphere.sharding.route.engine.type.ShardingRouteEngine;
  import org.apache.shardingsphere.sharding.route.engine.type.standard.ShardingStandardRoutingEngine;
  import org.apache.shardingsphere.sharding.rule.ShardingRule;
  import org.apache.shardingsphere.sharding.rule.ShardingTable;
  
  import java.util.Collection;
  import java.util.LinkedList;
  import java.util.Optional;
  import java.util.TreeSet;
  
  /**
   * Sharding complex routing engine.
   */
  @RequiredArgsConstructor
  public final class ShardingComplexRoutingEngine implements ShardingRouteEngine {
      
      private final ShardingConditions shardingConditions;
      
      private final SQLStatementContext sqlStatementContext;
      
      private final HintValueContext hintValueContext;
      
      private final ConfigurationProperties props;
      
      private final Collection<String> logicTables;
      
      @Override
      public RouteContext route(final ShardingRule shardingRule) {
          Collection<String> bindingTableNames = new TreeSet<>(String.CASE_INSENSITIVE_ORDER);
          Collection<RouteContext> routeContexts = new LinkedList<>();
          for (String each : logicTables) {
              Optional<ShardingTable> shardingTable = shardingRule.findShardingTable(each);
              if (shardingTable.isPresent()) {
                  if (!bindingTableNames.contains(each)) {
                      routeContexts.add(new ShardingStandardRoutingEngine(shardingTable.get().getLogicTable(), shardingConditions, sqlStatementContext, hintValueContext, props).route(shardingRule));
                  }
                  shardingRule.findBindingTableRule(each).ifPresent(optional -> bindingTableNames.addAll(optional.getShardingTables().keySet()));
              }
          }
          if (routeContexts.isEmpty()) {
              throw new ShardingTableRuleNotFoundException(logicTables);
          }
          RouteContext result = new RouteContext();
          if (1 == routeContexts.size()) {
              RouteContext newRouteContext = routeContexts.iterator().next();
              result.getOriginalDataNodes().addAll(newRouteContext.getOriginalDataNodes());
              result.getRouteUnits().addAll(newRouteContext.getRouteUnits());
          } else {
              RouteContext routeContext = new ShardingCartesianRoutingEngine(routeContexts).route(shardingRule);
              result.getOriginalDataNodes().addAll(routeContext.getOriginalDataNodes());
              result.getRouteUnits().addAll(routeContext.getRouteUnits());
          }
          return result;
      }
  }