#pragma once

#include "sql/item.h"

#include "../coders/protocol_fwd.h"

#include "error.h"
#include "parse.h"
#include "meta.h"

namespace rpc_executor {

class ExprParser {
public:
  static ExprParser &instance();
  int parse(const ::Polarx::Expr::Expr &arg,
            InternalDataSet &dataset,
            ExprItem *&item) const;
  int parse_field(const ::Polarx::Datatypes::Scalar &literal,
                  InternalDataSet &dataset,
                  ExprItem *&item,
                  const char *&field_name) const;

private:
  enum OP_TYPE {
      OP_PLUS,
      OP_GT,
      OP_GE,
      OP_EQ
  };

  int parse(const ::Polarx::Expr::Identifier &arg,
            InternalDataSet &dataset,
            ExprItem *&item,
            const bool is_function = false) const;
  int parse(const ::Polarx::Expr::ColumnIdentifier &arg,
            InternalDataSet &dataset,
            ExprItem *&item) const;
  int parse(const ::Polarx::Expr::FunctionCall &arg,
            InternalDataSet &dataset,
            ExprItem *&item) const;
  int parse(const ::Polarx::Expr::Operator &op,
            InternalDataSet &dataset,
            ExprItem *&item) const;
  int parse(const ::Polarx::Datatypes::Any &arg,
            InternalDataSet &dataset,
            ExprItem *&item) const;
  int parse(const ::Polarx::Datatypes::Scalar &literal,
            InternalDataSet &dataset,
            ExprItem *&item) const;
  int parse(const ::Polarx::Datatypes::Scalar::Octets &arg,
            InternalDataSet &dataset,
            ExprItem *&item) const;
  int parse_placeholder(const Placeholder &arg,
                        InternalDataSet &dataset,
                        ExprItem *&item) const;
  int parse(const ::Polarx::Expr::Object &arg,
            InternalDataSet &dataset,
            ExprItem *&item) const;
  int parse(const ::Polarx::Expr::Object::ObjectField &arg,
            InternalDataSet &dataset,
            ExprItem *&item) const;
  int parse(const ::Polarx::Expr::Array &arg,
            InternalDataSet &dataset,
            ExprItem *&item) const;
  int parse_fieldref(const FieldIndex &arg,
                     InternalDataSet &dataset,
                     ExprItem *&item) const;
};

} // namespace executor