/**
 * 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 SQL_ENGINE_EXPR_OB_EXPR_TO_NUMBER_BASE_H_
#define SQL_ENGINE_EXPR_OB_EXPR_TO_NUMBER_BASE_H_

#include "share/object/ob_obj_cast.h"
#include "sql/engine/expr/ob_expr_operator.h"
#include "sql/session/ob_sql_session_info.h"

namespace oceanbase {
namespace sql {

class ObExprToNumberBase : public ObFuncExprOperator {
public:
  explicit ObExprToNumberBase(common::ObIAllocator& alloc, const ObExprOperatorType type, const char* name);
  virtual ~ObExprToNumberBase();

  virtual int calc_result_typeN(
      ObExprResType& type, ObExprResType* types, int64_t param_num, common::ObExprTypeCtx& type_ctx) const;

private:
  DISALLOW_COPY_AND_ASSIGN(ObExprToNumberBase);
};

class ObExprToNumber : public ObExprToNumberBase {
public:
  explicit ObExprToNumber(common::ObIAllocator& alloc);
  virtual ~ObExprToNumber();

  virtual int calc_resultN(
      common::ObObj& result, const common::ObObj* objs, int64_t param_num, common::ObExprCtx& expr_ctx) const override;
  virtual int cg_expr(ObExprCGCtx& expr_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
  static int calc_(const ObString& in_str, const ObString& in_fmt_str, ObIAllocator& alloc, number::ObNumber& res_nmb);
  // for engine 3.0
  static int calc_tonumber_expr(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res_datum);

private:
  DISALLOW_COPY_AND_ASSIGN(ObExprToNumber);
};

class ObExprToBinaryFloat : public ObExprToNumberBase {
public:
  explicit ObExprToBinaryFloat(common::ObIAllocator& alloc);
  virtual ~ObExprToBinaryFloat();

  virtual int calc_resultN(
      common::ObObj& result, const common::ObObj* objs, int64_t param_num, common::ObExprCtx& expr_ctx) const override;
  virtual int calc_result_typeN(
      ObExprResType& type, ObExprResType* types, int64_t param_num, common::ObExprTypeCtx& type_ctx) const override;
  virtual int cg_expr(ObExprCGCtx& expr_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
  static int calc_(const ObString& in_str, const ObString& in_fmt_str, ObIAllocator& alloc, number::ObNumber& res_nmb);
  static int calc_to_binaryfloat_expr(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res_datum);

private:
  DISALLOW_COPY_AND_ASSIGN(ObExprToBinaryFloat);
};

class ObExprToBinaryDouble : public ObExprToNumberBase {
public:
  explicit ObExprToBinaryDouble(common::ObIAllocator& alloc);
  virtual ~ObExprToBinaryDouble();

  virtual int calc_resultN(
      common::ObObj& result, const common::ObObj* objs, int64_t param_num, common::ObExprCtx& expr_ctx) const override;
  virtual int calc_result_typeN(
      ObExprResType& type, ObExprResType* types, int64_t param_num, common::ObExprTypeCtx& type_ctx) const override;
  virtual int cg_expr(ObExprCGCtx& expr_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
  static int calc_to_binarydouble_expr(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res_datum);

private:
  DISALLOW_COPY_AND_ASSIGN(ObExprToBinaryDouble);
};

} /* namespace sql */
} /* namespace oceanbase */

#endif /* SQL_ENGINE_EXPR_OB_EXPR_TO_NUMBER_BASE_H_ */