/* Copyright (C) CJ Affiliate
  *
  * You may use, distribute and modify this code under  the
  * terms of the  GNU General Public License  version 2  or
  * later.
  *
  * You should have received a copy of the license with this
  * file. If not, you will find a copy in the "LICENSE" file
  * at https://github.com/cjdev/dual-control.
  */
 

 #ifndef GENERATOR_H_
 #define GENERATOR_H_
 
 #include <string>
 #include <functional>

 #include <sstream>
 #include <iomanip>

 #include <cmath>

 #include <ctime>

 #include <iostream>

 #include "sys_stdlib.h"

 #include "sys_time.h"

 #include "typealiases.h"

 int ipow (int base, int exp);
 time_t time_step (const time_t time, const int step);

 class token_generator_ifc

 {

 public:

     virtual std::string generate_token (const octet_vector &key) const = 0;

 };

 class totp_generator

 {

 public:

     using delegate = std::shared_ptr<token_generator_ifc>;

 private:

     delegate delegate_;
 

 public:

     std::string generate_token (const octet_vector &key) const

     {
         return delegate_->generate_token (key);
     }

     totp_generator (delegate delegate_) :

         delegate_ (delegate_)

     {}

     totp_generator (const sys_time clock,

                     const int code_digits);

 };

 
 #endif