/*
    * 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.data.pipeline.cdc.util;
  
  import lombok.AccessLevel;
  import lombok.NoArgsConstructor;
  import org.apache.shardingsphere.broadcast.rule.BroadcastRule;
  import org.apache.shardingsphere.data.pipeline.core.exception.param.PipelineInvalidParameterException;
  import org.apache.shardingsphere.infra.datanode.DataNode;
  import org.apache.shardingsphere.infra.metadata.database.ShardingSphereDatabase;
  import org.apache.shardingsphere.infra.rule.attribute.datanode.DataNodeRuleAttribute;
  import org.apache.shardingsphere.sharding.rule.ShardingRule;
  import org.apache.shardingsphere.sharding.rule.ShardingTable;
  import org.apache.shardingsphere.single.rule.SingleRule;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.Optional;
  
  /**
   * CDC data node utils.
   */
  @NoArgsConstructor(access = AccessLevel.PRIVATE)
  public final class CDCDataNodeUtils {
      
      /**
       * Build data nodes map.
       *
       * @param database database
       * @param tableNames table names
       * @return data nodes map
       * @throws PipelineInvalidParameterException thrown invalid parameter exception when can't get data nodes.
       */
      public static Map<String, List<DataNode>> buildDataNodesMap(final ShardingSphereDatabase database, final Collection<String> tableNames) {
          Optional<ShardingRule> shardingRule = database.getRuleMetaData().findSingleRule(ShardingRule.class);
          Optional<SingleRule> singleRule = database.getRuleMetaData().findSingleRule(SingleRule.class);
          Optional<BroadcastRule> broadcastRule = database.getRuleMetaData().findSingleRule(BroadcastRule.class);
          Map<String, List<DataNode>> result = new HashMap<>();
          // TODO support virtual data source name
          for (String each : tableNames) {
              if (singleRule.isPresent() && singleRule.get().getAttributes().getAttribute(DataNodeRuleAttribute.class).getAllDataNodes().containsKey(each)) {
                  result.put(each, new ArrayList<>(singleRule.get().getAttributes().getAttribute(DataNodeRuleAttribute.class).getAllDataNodes().get(each)));
                  continue;
              }
              if (shardingRule.isPresent() && shardingRule.get().findShardingTable(each).isPresent()) {
                  ShardingTable shardingTable = shardingRule.get().getShardingTable(each);
                  result.put(each, shardingTable.getActualDataNodes());
                  continue;
              }
              if (broadcastRule.isPresent() && broadcastRule.get().getAttributes().getAttribute(DataNodeRuleAttribute.class).findFirstActualTable(each).isPresent()) {
                  result.put(each, Collections.singletonList(broadcastRule.get().getAttributes().getAttribute(DataNodeRuleAttribute.class).getAllDataNodes().get(each).iterator().next()));
                  continue;
              }
              throw new PipelineInvalidParameterException(String.format("Not find actual data nodes of `%s`", each));
          }
          return result;
      }
  }