/*
    * 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.yaml.config.swapper.resource;
  
  import com.google.common.base.Preconditions;
  import org.apache.shardingsphere.infra.datasource.pool.creator.DataSourcePoolCreator;
  import org.apache.shardingsphere.infra.datasource.pool.props.domain.DataSourcePoolProperties;
  import org.apache.shardingsphere.infra.yaml.config.pojo.YamlRootConfiguration;
  
  import javax.sql.DataSource;
  import java.util.HashMap;
  import java.util.LinkedHashMap;
  import java.util.Map;
  import java.util.Map.Entry;
  import java.util.stream.Collectors;
  
  /**
   * YAML data source configuration swapper.
   */
  public final class YamlDataSourceConfigurationSwapper {
      
      private static final String DATA_SOURCE_CLASS_NAME_KEY = "dataSourceClassName";
      
      private static final String CUSTOM_POOL_PROPS_KEY = "customPoolProps";
      
      /**
       * Swap to data sources from YAML data sources.
       *
       * @param yamlDataSources YAML data sources map
       * @return data sources
       */
      public Map<String, DataSource> swapToDataSources(final Map<String, Map<String, Object>> yamlDataSources) {
          return swapToDataSources(yamlDataSources, true);
      }
      
      /**
       * Swap to data sources from YAML data sources.
       *
       * @param yamlDataSources YAML data sources map
       * @param cacheEnabled cache enabled
       * @return data sources
       */
      public Map<String, DataSource> swapToDataSources(final Map<String, Map<String, Object>> yamlDataSources, final boolean cacheEnabled) {
          return DataSourcePoolCreator.create(yamlDataSources.entrySet().stream().collect(Collectors.toMap(Entry::getKey, entry -> swapToDataSourcePoolProperties(entry.getValue()))), cacheEnabled);
      }
      
      /**
       * Get data source pool properties.
       *
       * @param yamlRootConfig YAML root configuration
       * @return data source name to data source pool properties map
       */
      public Map<String, DataSourcePoolProperties> getDataSourcePoolPropertiesMap(final YamlRootConfiguration yamlRootConfig) {
          Map<String, Map<String, Object>> yamlDataSourceConfigs = yamlRootConfig.getDataSources();
          Map<String, DataSourcePoolProperties> result = new LinkedHashMap<>(yamlDataSourceConfigs.size(), 1F);
          yamlDataSourceConfigs.forEach((key, value) -> result.put(key, swapToDataSourcePoolProperties(value)));
          return result;
      }
      
      /**
       * Swap to data source pool properties.
       * 
       * @param yamlConfig YAML configurations
       * @return data source pool properties
       */
      public DataSourcePoolProperties swapToDataSourcePoolProperties(final Map<String, Object> yamlConfig) {
          Preconditions.checkState(yamlConfig.containsKey(DATA_SOURCE_CLASS_NAME_KEY), "%s can not be null.", DATA_SOURCE_CLASS_NAME_KEY);
          return new DataSourcePoolProperties(yamlConfig.get(DATA_SOURCE_CLASS_NAME_KEY).toString(), getProperties(yamlConfig));
      }
      
      @SuppressWarnings({"rawtypes", "unchecked"})
      private Map<String, Object> getProperties(final Map<String, Object> yamlConfig) {
          Map<String, Object> result = new HashMap<>(yamlConfig);
          if ("com.zaxxer.hikari.HikariDataSource".equals(result.get(DATA_SOURCE_CLASS_NAME_KEY).toString())) {
              result.remove(DATA_SOURCE_CLASS_NAME_KEY);
          }
          if (null != yamlConfig.get(CUSTOM_POOL_PROPS_KEY)) {
              result.putAll((Map) yamlConfig.get(CUSTOM_POOL_PROPS_KEY));
          }
          result.remove(CUSTOM_POOL_PROPS_KEY);
          return result;
      }
      
      /**
      * Swap to map from data source properties.
      * 
      * @param props data source pool properties
      * @return data source map
      */
     public Map<String, Object> swapToMap(final DataSourcePoolProperties props) {
         Map<String, Object> result = new HashMap<>(props.getAllStandardProperties());
         result.put(DATA_SOURCE_CLASS_NAME_KEY, props.getPoolClassName());
         return result;
     }
 }