/*
    * 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.core.datasource.creator;
  
  import org.apache.shardingsphere.authority.yaml.config.YamlAuthorityRuleConfiguration;
  import org.apache.shardingsphere.data.pipeline.api.type.ShardingSpherePipelineDataSourceConfiguration;
  import org.apache.shardingsphere.data.pipeline.core.context.PipelineContextManager;
  import org.apache.shardingsphere.data.pipeline.core.datasource.yaml.PipelineYamlRuleConfigurationReviser;
  import org.apache.shardingsphere.data.pipeline.spi.PipelineDataSourceCreator;
  import org.apache.shardingsphere.driver.api.ShardingSphereDataSourceFactory;
  import org.apache.shardingsphere.infra.config.mode.ModeConfiguration;
  import org.apache.shardingsphere.infra.config.props.ConfigurationPropertyKey;
  import org.apache.shardingsphere.infra.config.props.temporary.TemporaryConfigurationPropertyKey;
  import org.apache.shardingsphere.infra.config.rule.RuleConfiguration;
  import org.apache.shardingsphere.infra.datasource.pool.destroyer.DataSourcePoolDestroyer;
  import org.apache.shardingsphere.infra.spi.type.ordered.OrderedSPILoader;
  import org.apache.shardingsphere.infra.util.yaml.YamlEngine;
  import org.apache.shardingsphere.infra.yaml.config.pojo.YamlRootConfiguration;
  import org.apache.shardingsphere.infra.yaml.config.pojo.mode.YamlModeConfiguration;
  import org.apache.shardingsphere.infra.yaml.config.pojo.mode.YamlPersistRepositoryConfiguration;
  import org.apache.shardingsphere.infra.yaml.config.swapper.mode.YamlModeConfigurationSwapper;
  import org.apache.shardingsphere.infra.yaml.config.swapper.resource.YamlDataSourceConfigurationSwapper;
  import org.apache.shardingsphere.infra.yaml.config.swapper.rule.YamlRuleConfigurationSwapperEngine;
  import org.apache.shardingsphere.mode.manager.ContextManager;
  
  import javax.sql.DataSource;
  import java.sql.SQLException;
  import java.util.Collection;
  import java.util.LinkedList;
  import java.util.List;
  import java.util.Map;
  import java.util.Properties;
  
  /**
   * ShardingSphere pipeline data source creator.
   */
  public final class ShardingSpherePipelineDataSourceCreator implements PipelineDataSourceCreator {
      
      @Override
      public DataSource create(final Object dataSourceConfig) throws SQLException {
          YamlRootConfiguration yamlRootConfig = YamlEngine.unmarshal(YamlEngine.marshal(dataSourceConfig), YamlRootConfiguration.class);
          removeAuthorityRuleConfiguration(yamlRootConfig);
          yamlRootConfig.setProps(createConfigurationProperties());
          reviseYamlRuleConfiguration(yamlRootConfig);
          yamlRootConfig.setMode(createStandaloneModeConfiguration());
          return createShardingSphereDataSource(yamlRootConfig);
      }
      
      private void removeAuthorityRuleConfiguration(final YamlRootConfiguration yamlRootConfig) {
          yamlRootConfig.getRules().removeIf(YamlAuthorityRuleConfiguration.class::isInstance);
      }
      
      private Properties createConfigurationProperties() {
          Properties realtimeProps = getRealtimeProperties();
          Properties result = new Properties();
          for (String each : getConfigurationPropertyKeys()) {
              Object value = realtimeProps.get(each);
              if (null != value) {
                  result.put(each, value);
              }
          }
          result.put(TemporaryConfigurationPropertyKey.SYSTEM_SCHEMA_METADATA_ASSEMBLY_ENABLED.getKey(), String.valueOf(Boolean.FALSE));
          // Set a large enough value to enable ConnectionMode.MEMORY_STRICTLY, make sure streaming query work.
          result.put(ConfigurationPropertyKey.MAX_CONNECTIONS_SIZE_PER_QUERY.getKey(), 100000);
          return result;
      }
      
      private Properties getRealtimeProperties() {
          ContextManager contextManager = PipelineContextManager.getProxyContext();
          if (null == contextManager) {
              return new Properties();
          }
          return contextManager.getMetaDataContexts().getMetaData().getProps().getProps();
      }
      
      private List<String> getConfigurationPropertyKeys() {
          List<String> result = new LinkedList<>();
          result.add(ConfigurationPropertyKey.KERNEL_EXECUTOR_SIZE.getKey());
          result.add(ConfigurationPropertyKey.SQL_SHOW.getKey());
          return result;
      }
      
      @SuppressWarnings("unchecked")
      private void reviseYamlRuleConfiguration(final YamlRootConfiguration yamlRootConfig) {
         OrderedSPILoader.getServices(PipelineYamlRuleConfigurationReviser.class, yamlRootConfig.getRules()).forEach((key, value) -> value.revise(key));
     }
     
     private YamlModeConfiguration createStandaloneModeConfiguration() {
         YamlModeConfiguration result = new YamlModeConfiguration();
         result.setType("Standalone");
         YamlPersistRepositoryConfiguration yamlRepositoryConfig = new YamlPersistRepositoryConfiguration();
         yamlRepositoryConfig.setType("Memory");
         result.setRepository(yamlRepositoryConfig);
         return result;
     }
     
     private DataSource createShardingSphereDataSource(final YamlRootConfiguration yamlRootConfig) throws SQLException {
         Map<String, DataSource> dataSourceMap = new YamlDataSourceConfigurationSwapper().swapToDataSources(yamlRootConfig.getDataSources(), false);
         try {
             return createShardingSphereDataSource(dataSourceMap, yamlRootConfig);
             // CHECKSTYLE:OFF
         } catch (final SQLException | RuntimeException ex) {
             // CHECKSTYLE:ON
             dataSourceMap.values().stream().map(DataSourcePoolDestroyer::new).forEach(DataSourcePoolDestroyer::asyncDestroy);
             throw ex;
         }
     }
     
     private DataSource createShardingSphereDataSource(final Map<String, DataSource> dataSourceMap, final YamlRootConfiguration yamlRootConfig) throws SQLException {
         ModeConfiguration modeConfig = new YamlModeConfigurationSwapper().swapToObject(yamlRootConfig.getMode());
         Collection<RuleConfiguration> ruleConfigs = new YamlRuleConfigurationSwapperEngine().swapToRuleConfigurations(yamlRootConfig.getRules());
         return ShardingSphereDataSourceFactory.createDataSource(yamlRootConfig.getDatabaseName(), modeConfig, dataSourceMap, ruleConfigs, yamlRootConfig.getProps());
     }
     
     @Override
     public String getType() {
         return ShardingSpherePipelineDataSourceConfiguration.TYPE;
     }
 }