/*
    * 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.infra.binder.context.statement.SQLStatementContext;
  import org.apache.shardingsphere.infra.binder.context.statement.SQLStatementContextFactory;
  import org.apache.shardingsphere.infra.binder.statement.ddl.CursorStatementBinder;
  import org.apache.shardingsphere.infra.binder.statement.dml.DeleteStatementBinder;
  import org.apache.shardingsphere.infra.binder.statement.dml.InsertStatementBinder;
  import org.apache.shardingsphere.infra.binder.statement.dml.MergeStatementBinder;
  import org.apache.shardingsphere.infra.binder.statement.dml.SelectStatementBinder;
  import org.apache.shardingsphere.infra.binder.statement.dml.UpdateStatementBinder;
  import org.apache.shardingsphere.infra.hint.HintValueContext;
  import org.apache.shardingsphere.infra.metadata.ShardingSphereMetaData;
  import org.apache.shardingsphere.sql.parser.sql.common.statement.SQLStatement;
  import org.apache.shardingsphere.sql.parser.sql.common.statement.ddl.DDLStatement;
  import org.apache.shardingsphere.sql.parser.sql.common.statement.dml.DMLStatement;
  import org.apache.shardingsphere.sql.parser.sql.common.statement.dml.DeleteStatement;
  import org.apache.shardingsphere.sql.parser.sql.common.statement.dml.InsertStatement;
  import org.apache.shardingsphere.sql.parser.sql.common.statement.dml.MergeStatement;
  import org.apache.shardingsphere.sql.parser.sql.common.statement.dml.SelectStatement;
  import org.apache.shardingsphere.sql.parser.sql.common.statement.dml.UpdateStatement;
  import org.apache.shardingsphere.sql.parser.sql.dialect.statement.opengauss.ddl.OpenGaussCursorStatement;
  
  import java.util.List;
  
  /**
   * SQL bind engine.
   */
  @RequiredArgsConstructor
  public final class SQLBindEngine {
      
      private final ShardingSphereMetaData metaData;
      
      private final String defaultDatabaseName;
      
      private final HintValueContext hintValueContext;
      
      /**
       * Bind SQL statement with metadata.
       *
       * @param sqlStatement SQL statement
       * @param params parameters
       * @return SQL statement context
       */
      public SQLStatementContext bind(final SQLStatement sqlStatement, final List<Object> params) {
          SQLStatement buoundedSQLStatement = bind(sqlStatement, metaData, defaultDatabaseName);
          return SQLStatementContextFactory.newInstance(metaData, params, buoundedSQLStatement, defaultDatabaseName);
      }
      
      private SQLStatement bind(final SQLStatement statement, final ShardingSphereMetaData metaData, final String defaultDatabaseName) {
          if (hintValueContext.findHintDataSourceName().isPresent()) {
              return statement;
          }
          if (statement instanceof DMLStatement) {
              return bindDMLStatement(statement, metaData, defaultDatabaseName);
          }
          if (statement instanceof DDLStatement) {
              return bindDDLStatement(statement, metaData, defaultDatabaseName);
          }
          return statement;
      }
      
      private static SQLStatement bindDMLStatement(final SQLStatement statement, final ShardingSphereMetaData metaData, final String defaultDatabaseName) {
          if (statement instanceof SelectStatement) {
              return new SelectStatementBinder().bind((SelectStatement) statement, metaData, defaultDatabaseName);
          }
          if (statement instanceof InsertStatement) {
              return new InsertStatementBinder().bind((InsertStatement) statement, metaData, defaultDatabaseName);
          }
          if (statement instanceof UpdateStatement) {
              return new UpdateStatementBinder().bind((UpdateStatement) statement, metaData, defaultDatabaseName);
          }
          if (statement instanceof DeleteStatement) {
              return new DeleteStatementBinder().bind((DeleteStatement) statement, metaData, defaultDatabaseName);
          }
          if (statement instanceof MergeStatement) {
              return new MergeStatementBinder().bind((MergeStatement) statement, metaData, defaultDatabaseName);
          }
          return statement;
      }
      
      private static SQLStatement bindDDLStatement(final SQLStatement statement, final ShardingSphereMetaData metaData, final String defaultDatabaseName) {
         if (statement instanceof OpenGaussCursorStatement) {
             return new CursorStatementBinder().bind((OpenGaussCursorStatement) statement, metaData, defaultDatabaseName);
         }
         return statement;
     }
 }