// Copyright (C) 2016 xaizek <xaizek@posteo.net>
//
// This file is part of dit.
//
// dit is free software: you can redistribute it and/or modify
// it under the terms of version 3 of the GNU Affero General Public
// License as published by the Free Software Foundation.
//
// dit 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 dit.  If not, see <http://www.gnu.org/licenses/>.

#ifndef DIT__UTILS__TIME_HPP__
#define DIT__UTILS__TIME_HPP__

#include <ctime>

#include <sstream>
#include <tuple>

/**
 * @brief std::put_time emulation with a tuple (available since GCC 5.0).
 */
using put_time = std::tuple<const std::tm *, const char *>;

/**
 * @brief Expands put_time data into a string and prints it out.
 *
 * @param os Stream to print formated time onto.
 * @param pt put_time manipulator emulation.
 *
 * @returns @p os.
 */
inline std::ostream &
operator<<(std::ostream &os, const put_time &pt)
{
    char buf[128];
    std::strftime(buf, sizeof(buf), std::get<1>(pt), std::get<0>(pt));
    return os << buf;
}

/**
 * @brief Converts time since epoch into local time in ISO 8601 format.
 *
 * @param t Time to convert into string.
 *
 * @returns String representation of @p t.
 */
inline std::string
timeToString(std::time_t t)
{
    std::ostringstream oss;
    oss << put_time(std::localtime(&t), "%Y-%m-%d %H:%M:%S");
    return oss.str();
}

#endif // DIT__UTILS__TIME_HPP__