/**
 * Copyright (c) 2021 OceanBase
 * OceanBase CE is licensed under Mulan PubL v2.
 * You can use this software according to the terms and conditions of the Mulan PubL v2.
 * You may obtain a copy of Mulan PubL v2 at:
 *          http://license.coscl.org.cn/MulanPubL-2.0
 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
 * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
 * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
 * See the Mulan PubL v2 for more details.
 */

#ifndef OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_INT_DIV_H_
#define OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_INT_DIV_H_
#include "sql/engine/expr/ob_expr_operator.h"
namespace oceanbase {
namespace sql {
class ObExprIntDiv : public ObArithExprOperator {
public:
  ObExprIntDiv();
  explicit ObExprIntDiv(common::ObIAllocator& alloc);
  virtual ~ObExprIntDiv(){};
  virtual int calc_result_type2(
      ObExprResType& type, ObExprResType& type1, ObExprResType& type2, common::ObExprTypeCtx& type_ctx) const override;
  virtual int calc_result2(
      common::ObObj& res, const common::ObObj& ojb1, const common::ObObj& obj2, common::ObExprCtx& expr_ctx) const override;
  static int calc(common::ObObj& res, const common::ObObj& ojb1, const common::ObObj& obj2,
      common::ObIAllocator* allocator, common::ObScale scale);
  static int div_int_int(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
  static int div_int_uint(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
  static int div_uint_int(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
  static int div_uint_uint(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
  static int div_number(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);

  // temporary used, remove after all expr converted
  virtual int cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;

private:
  OB_INLINE static int intdiv_int(common::ObObj& res, const common::ObObj& left, const common::ObObj& right,
      common::ObIAllocator* allocator, common::ObScale scale);
  OB_INLINE static int intdiv_uint(common::ObObj& res, const common::ObObj& left, const common::ObObj& right,
      common::ObIAllocator* allocator, common::ObScale scale);
  static int intdiv_number(common::ObObj& res, const common::ObObj& left, const common::ObObj& right,
      common::ObIAllocator* allocator, common::ObScale scale);
  static ObArithFunc int_div_funcs_[common::ObMaxTC];
  OB_INLINE static bool is_int_int_out_of_range(int64_t val1, int64_t val2, int64_t res)
  {
    // top digit:
    // 0 div 0     : safe.
    // 0 div 1     : safe.
    // 1 div 0     : safe.
    // 1 div 1 = 0 : safe.
    // 1 div 1 = 1 : overflow.
    return (val1 >> 63) && (val2 >> 63) && (res >> 63);
  }
  DISALLOW_COPY_AND_ASSIGN(ObExprIntDiv);
};
}  // namespace sql
}  // namespace oceanbase

#endif /* OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_INT_DIV_H_ */
