#include <memory>

 #include <vector>
 #include <string>
 #include <pwd.h>

 #include <unistd.h>

 #include <iostream>
 
 #include "user.h"

 #include "test_support.h"

 user::user (struct passwd *sys_info) : info (sys_info)

 {

 }
 

 std::string user::home_directory()
 {

     return info->pw_dir;
 }
 

 // concrete user implementation
 

 class concrete_user : public user
 {
 private:
     std::vector<char> buffer_;
     std::shared_ptr<struct passwd> store_;
 public:

     concrete_user (const std::vector<char> &buffer,
                    const std::shared_ptr<struct passwd> &store);

 };
 

 concrete_user::concrete_user (const std::vector<char> &buffer,
                               const std::shared_ptr<struct passwd> &store) :
     buffer_ (buffer),
     store_ (store),
     user (store.get())

 {

 }
 

 const std::shared_ptr<user> create_user (const std::string &user_name)

 {

     std::vector<char> buffer (sysconf (_SC_GETPW_R_SIZE_MAX));
     std::shared_ptr<struct passwd> sys_passwd (new struct passwd);
     struct passwd *found_passwd (0);

     getpwnam_r (user_name.c_str(), sys_passwd.get(), buffer.data(),
                 buffer.size(), &found_passwd);

     std::shared_ptr<user> rval;

     if (found_passwd) {

         rval.reset (new concrete_user (buffer, sys_passwd));

     }

     return rval;

 }