#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;
}