/*
   Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
*/

#ifndef ABSTRACT_STRING_OPTION_INCLUDED
#define ABSTRACT_STRING_OPTION_INCLUDED

#include <string>
#include "my_getopt.h"
#include "abstract_value_option.h"
#include "nullable.h"
#include "instance_callback.h"

namespace Mysql{
namespace Tools{
namespace Base{
namespace Options{

using std::string;
using Mysql::Nullable;

/**
  Abstract option to handle options accepting string value argument.
 */
template<typename T_type> class Abstract_string_option
  : public Abstract_value_option<T_type>
{
public:
  /**
    Sets value for this option. If it is specified before handling commandline
    options then supplied value is used as default value of this option.
   */
  T_type* set_value(string value);

protected:
  /**
    Constructs new string option.
    @param value Pointer to string object to receive option value.
    @param var_type my_getopt internal option type.
    @param name Name of option. It is used in command line option name as
      --name.
    @param desription Description of option to be printed in --help.
   */
  Abstract_string_option(
    Nullable<string>* value, ulong var_type, string name, string description);

  Nullable<string>* m_destination_value;

private:
  void string_callback(char* argument);

  const char* m_original_value;
};


template<typename T_type> Abstract_string_option<T_type>::Abstract_string_option(
  Nullable<string>* value, ulong var_type, string name, string description)
  : Abstract_value_option<T_type>(
  &this->m_original_value, var_type, name, description, (uint64)NULL),
  m_destination_value(value)
{
  *value= Nullable<string>();
  this->m_original_value= NULL;

  this->add_callback(new Base::Instance_callback
    <void, char*, Abstract_string_option<T_type> >(
      this, &Abstract_string_option<T_type>::string_callback));
}

template<typename T_type> T_type* Abstract_string_option<T_type>::set_value(
  string value)
{
  *this->m_destination_value= Nullable<string>(value);
  this->m_original_value= this->m_destination_value->value().c_str();
  this->m_option_structure.def_value= (uint64)this->m_destination_value
    ->value().c_str();
  return (T_type*)this;
}

template<typename T_type> void Abstract_string_option<T_type>::string_callback(
  char* argument)
{
  if (argument != NULL)
  {
    // Copy argument value from char* to destination string
    *this->m_destination_value= Nullable<string>(this->m_original_value);
  }
  else
  {
    // There is no argument supplied, we shouldn't change default value.
  }
}

}
}
}
}

#endif
