/*
    *    Copyright 2009-2021 the original author or authors.
    *
    *    Licensed 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.ibatis.executor.statement;
  
  import java.sql.CallableStatement;
  import java.sql.Connection;
  import java.sql.ResultSet;
  import java.sql.SQLException;
  import java.sql.Statement;
  import java.util.List;
  
  import org.apache.ibatis.cursor.Cursor;
  import org.apache.ibatis.executor.Executor;
  import org.apache.ibatis.executor.ExecutorException;
  import org.apache.ibatis.executor.keygen.KeyGenerator;
  import org.apache.ibatis.mapping.BoundSql;
  import org.apache.ibatis.mapping.MappedStatement;
  import org.apache.ibatis.mapping.ParameterMapping;
  import org.apache.ibatis.mapping.ParameterMode;
  import org.apache.ibatis.mapping.ResultSetType;
  import org.apache.ibatis.session.ResultHandler;
  import org.apache.ibatis.session.RowBounds;
  import org.apache.ibatis.type.JdbcType;
  
  /**
   * @author Clinton Begin
   */
  public class CallableStatementHandler extends BaseStatementHandler {
  
    public CallableStatementHandler(Executor executor, MappedStatement mappedStatement, Object parameter, RowBounds rowBounds, ResultHandler resultHandler, BoundSql boundSql) {
      super(executor, mappedStatement, parameter, rowBounds, resultHandler, boundSql);
    }
  
    @Override
    public int update(Statement statement) throws SQLException {
      CallableStatement cs = (CallableStatement) statement;
      cs.execute();
      int rows = cs.getUpdateCount();
      Object parameterObject = boundSql.getParameterObject();
      KeyGenerator keyGenerator = mappedStatement.getKeyGenerator();
      keyGenerator.processAfter(executor, mappedStatement, cs, parameterObject);
      resultSetHandler.handleOutputParameters(cs);
      return rows;
    }
  
    @Override
    public void batch(Statement statement) throws SQLException {
      CallableStatement cs = (CallableStatement) statement;
      cs.addBatch();
    }
  
    @Override
    public <E> List<E> query(Statement statement, ResultHandler resultHandler) throws SQLException {
      CallableStatement cs = (CallableStatement) statement;
      cs.execute();
      List<E> resultList = resultSetHandler.handleResultSets(cs);
      resultSetHandler.handleOutputParameters(cs);
      return resultList;
    }
  
    @Override
    public <E> Cursor<E> queryCursor(Statement statement) throws SQLException {
      CallableStatement cs = (CallableStatement) statement;
      cs.execute();
      Cursor<E> resultList = resultSetHandler.handleCursorResultSets(cs);
      resultSetHandler.handleOutputParameters(cs);
      return resultList;
    }
  
    @Override
    protected Statement instantiateStatement(Connection connection) throws SQLException {
      String sql = boundSql.getSql();
      if (mappedStatement.getResultSetType() == ResultSetType.DEFAULT) {
        return connection.prepareCall(sql);
      } else {
        return connection.prepareCall(sql, mappedStatement.getResultSetType().getValue(), ResultSet.CONCUR_READ_ONLY);
      }
    }
  
    @Override
    public void parameterize(Statement statement) throws SQLException {
      registerOutputParameters((CallableStatement) statement);
      parameterHandler.setParameters((CallableStatement) statement);
    }
  
    private void registerOutputParameters(CallableStatement cs) throws SQLException {
     List<ParameterMapping> parameterMappings = boundSql.getParameterMappings();
     for (int i = 0, n = parameterMappings.size(); i < n; i++) {
       ParameterMapping parameterMapping = parameterMappings.get(i);
       if (parameterMapping.getMode() == ParameterMode.OUT || parameterMapping.getMode() == ParameterMode.INOUT) {
         if (null == parameterMapping.getJdbcType()) {
           throw new ExecutorException("The JDBC Type must be specified for output parameter.  Parameter: " + parameterMapping.getProperty());
         } else {
           if (parameterMapping.getNumericScale() != null && (parameterMapping.getJdbcType() == JdbcType.NUMERIC || parameterMapping.getJdbcType() == JdbcType.DECIMAL)) {
             cs.registerOutParameter(i + 1, parameterMapping.getJdbcType().TYPE_CODE, parameterMapping.getNumericScale());
           } else {
             if (parameterMapping.getJdbcTypeName() == null) {
               cs.registerOutParameter(i + 1, parameterMapping.getJdbcType().TYPE_CODE);
             } else {
               cs.registerOutParameter(i + 1, parameterMapping.getJdbcType().TYPE_CODE, parameterMapping.getJdbcTypeName());
             }
           }
         }
       }
     }
   }
 
 }