/*
    * 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.binder.engine;
  
  import lombok.RequiredArgsConstructor;
  import org.apache.shardingsphere.database.connector.core.spi.DatabaseTypedSPILoader;
  import org.apache.shardingsphere.infra.binder.context.SQLStatementContextFactory;
  import org.apache.shardingsphere.infra.binder.context.statement.SQLStatementContext;
  import org.apache.shardingsphere.infra.binder.engine.statement.SQLStatementBinderContext;
  import org.apache.shardingsphere.infra.binder.engine.type.DALStatementBindEngine;
  import org.apache.shardingsphere.infra.binder.engine.type.DCLStatementBindEngine;
  import org.apache.shardingsphere.infra.binder.engine.type.DDLStatementBindEngine;
  import org.apache.shardingsphere.infra.binder.engine.type.DMLStatementBindEngine;
  import org.apache.shardingsphere.infra.hint.HintManager;
  import org.apache.shardingsphere.infra.hint.HintValueContext;
  import org.apache.shardingsphere.infra.metadata.ShardingSphereMetaData;
  import org.apache.shardingsphere.sql.parser.statement.core.statement.SQLStatement;
  import org.apache.shardingsphere.sql.parser.statement.core.statement.type.dal.DALStatement;
  import org.apache.shardingsphere.sql.parser.statement.core.statement.type.dcl.DCLStatement;
  import org.apache.shardingsphere.sql.parser.statement.core.statement.type.ddl.DDLStatement;
  import org.apache.shardingsphere.sql.parser.statement.core.statement.type.dml.DMLStatement;
  
  import java.util.Optional;
  
  /**
   * SQL bind engine.
   */
  @RequiredArgsConstructor
  public final class SQLBindEngine {
      
      private final ShardingSphereMetaData metaData;
      
      private final String currentDatabaseName;
      
      private final HintValueContext hintValueContext;
      
      /**
       * Bind SQL statement.
       *
       * @param sqlStatement SQL statement
       * @return SQL statement context
       */
      public SQLStatementContext bind(final SQLStatement sqlStatement) {
          SQLStatement boundSQLStatement = isNeedBind() ? bindSQLStatement(sqlStatement) : sqlStatement;
          return SQLStatementContextFactory.newInstance(metaData, boundSQLStatement, currentDatabaseName);
      }
      
      private SQLStatement bindSQLStatement(final SQLStatement sqlStatement) {
          SQLStatementBinderContext binderContext = new SQLStatementBinderContext(metaData, currentDatabaseName, hintValueContext, sqlStatement);
          Optional<DialectSQLBindEngine> dialectSQLBindEngine = DatabaseTypedSPILoader.findService(DialectSQLBindEngine.class, sqlStatement.getDatabaseType());
          if (dialectSQLBindEngine.isPresent()) {
              Optional<SQLStatement> boundSQLStatement = dialectSQLBindEngine.get().bind(sqlStatement, binderContext);
              if (boundSQLStatement.isPresent()) {
                  return boundSQLStatement.get();
              }
          }
          if (sqlStatement instanceof DMLStatement) {
              return new DMLStatementBindEngine().bind((DMLStatement) sqlStatement, binderContext);
          }
          if (sqlStatement instanceof DDLStatement) {
              return new DDLStatementBindEngine().bind((DDLStatement) sqlStatement, binderContext);
          }
          if (sqlStatement instanceof DCLStatement) {
              return new DCLStatementBindEngine().bind((DCLStatement) sqlStatement, binderContext);
          }
          if (sqlStatement instanceof DALStatement) {
              return new DALStatementBindEngine().bind((DALStatement) sqlStatement, binderContext);
          }
          return sqlStatement;
      }
      
      private boolean isNeedBind() {
          return !hintValueContext.findHintDataSourceName().isPresent() && !HintManager.getDataSourceName().isPresent();
      }
  }