/*
    * 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.config.database.impl;
  
  import lombok.Getter;
  import org.apache.shardingsphere.infra.config.database.DatabaseConfiguration;
  import org.apache.shardingsphere.infra.config.rule.RuleConfiguration;
  import org.apache.shardingsphere.infra.datasource.pool.config.DataSourceConfiguration;
  import org.apache.shardingsphere.infra.datasource.pool.creator.DataSourcePoolCreator;
  import org.apache.shardingsphere.infra.datasource.pool.props.creator.DataSourcePoolPropertiesCreator;
  import org.apache.shardingsphere.infra.datasource.pool.props.domain.DataSourcePoolProperties;
  import org.apache.shardingsphere.infra.metadata.database.resource.node.StorageNode;
  import org.apache.shardingsphere.infra.metadata.database.resource.unit.StorageUnit;
  import org.apache.shardingsphere.infra.metadata.database.resource.unit.StorageUnitNodeMapCreator;
  import org.apache.shardingsphere.infra.util.close.DataSourcesCloser;
  
  import javax.sql.DataSource;
  import java.util.Collection;
  import java.util.LinkedHashMap;
  import java.util.Map;
  import java.util.Map.Entry;
  import java.util.stream.Collectors;
  
  /**
   * Data source generated database configuration.
   */
  @Getter
  public final class DataSourceGeneratedDatabaseConfiguration implements DatabaseConfiguration {
      
      private final Collection<RuleConfiguration> ruleConfigurations;
      
      private final Map<String, StorageUnit> storageUnits;
      
      private final Map<StorageNode, DataSource> dataSources;
      
      public DataSourceGeneratedDatabaseConfiguration(final Map<String, DataSourceConfiguration> dataSourceConfigs, final Collection<RuleConfiguration> ruleConfigs) {
          ruleConfigurations = ruleConfigs;
          Map<String, DataSourcePoolProperties> dataSourcePoolPropertiesMap = dataSourceConfigs.entrySet().stream()
                  .collect(Collectors.toMap(Entry::getKey, entry -> DataSourcePoolPropertiesCreator.create(entry.getValue()), (oldValue, currentValue) -> oldValue, LinkedHashMap::new));
          Map<String, StorageNode> storageUnitNodeMap = StorageUnitNodeMapCreator.create(dataSourcePoolPropertiesMap);
          Map<StorageNode, DataSource> storageNodeDataSources = getStorageNodeDataSourceMap(dataSourcePoolPropertiesMap, storageUnitNodeMap);
          storageUnits = new LinkedHashMap<>(dataSourceConfigs.size(), 1F);
          for (Entry<String, DataSourceConfiguration> entry : dataSourceConfigs.entrySet()) {
              String storageUnitName = entry.getKey();
              StorageNode storageNode = storageUnitNodeMap.get(storageUnitName);
              DataSource dataSource = storageNodeDataSources.get(storageNode);
              StorageUnit storageUnit = new StorageUnit(storageNode, dataSourcePoolPropertiesMap.get(storageUnitName), dataSource);
              storageUnits.put(storageUnitName, storageUnit);
          }
          dataSources = storageNodeDataSources;
      }
      
      private Map<StorageNode, DataSource> getStorageNodeDataSourceMap(final Map<String, DataSourcePoolProperties> dataSourcePoolPropertiesMap, final Map<String, StorageNode> storageUnitNodeMap) {
          Map<StorageNode, DataSource> result = new LinkedHashMap<>(storageUnitNodeMap.size(), 1F);
          try {
              for (Entry<String, StorageNode> entry : storageUnitNodeMap.entrySet()) {
                  result.computeIfAbsent(entry.getValue(), key -> DataSourcePoolCreator.create(entry.getKey(), dataSourcePoolPropertiesMap.get(entry.getKey()), true, result.values()));
              }
              // CHECKSTYLE:OFF
          } catch (final Exception ex) {
              // CHECKSTYLE:ON
              DataSourcesCloser.close(result.values());
              throw ex;
          }
          return result;
      }
  }