#pragma once

#include <security/pam_ext.h>

#include <security/pam_appl.h>
#include <security/pam_client.h>
#include <security/pam_ext.h>
#include <security/pam_misc.h>
#include <security/pam_modules.h>

#include <optional>
#include <string>
#include <system_error>
#include <type_traits>
#include <utility>

#include <memory>

#include "utils.hpp"

namespace rublon {
class LinuxPam {
    pam_handle_t * pamh;

  public:
    LinuxPam(pam_handle_t * handler) : pamh{handler} {}

    rublon::NonOwningPtr< const char > ip() const {
        const void * ip = NULL;
        pam_get_item(pamh, PAM_RHOST, &ip);
        if(ip == NULL) {
            rublon::log(rublon::LogLevel::Warning, "Cant read user from linux PAM");
            ip = "";
        }
        return ( const char * ) ip;
    }

    rublon::NonOwningPtr< const char > username() const {
        const char * user = NULL;
        pam_get_user(pamh, &user, nullptr);
        if(user == NULL) {
            rublon::log(rublon::LogLevel::Warning, "Cant read user from linux PAM");
            user = "";
        }
        return user;
    }

    template < typename... Ti >
    void print(const char * fmt, Ti... ti) const noexcept {
        pam_prompt(pamh, PAM_TEXT_INFO, nullptr, fmt, std::forward< Ti >(ti)...);
    }

    template < typename Fun, typename... Ti >
    [[nodiscard]] auto scan(Fun && f, const char * fmt, Ti... ti) const noexcept {
        char * responseBuffer = nullptr;
        pam_prompt(pamh, PAM_PROMPT_ECHO_ON, &responseBuffer, fmt, std::forward< Ti >(ti)...);
        if(responseBuffer) {
            auto ret = f(responseBuffer);
            free(responseBuffer);
            return std::optional{ret};
        }
        return std::optional< std::result_of_t< Fun(char *) > >();
    }
};
} // namespace rublon