#pragma once
#include <string>

struct Result
{
    std::string equation;
    std::string value;
    bool isError;
};

class Calculator
{
    /// @param from: string which is going to be replaced
    /// @param to: string which is going to replace the old one
    /// @return: new string with replaced all occurrences of given string to the new one in whole input
    std::string replaceAllOccurrences(std::string input, const std::string &from, const std::string &to);
    std::string prepareEquationForParser(std::string input);

  public:
    Result calculate(std::string source);
};