/*
 * Bittorrent Client using Qt and libtorrent.
 * Copyright (C) 2006  Christophe Dumez <chris@qbittorrent.org>
 *
 * 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; either version 2
 * of the License, or (at your option) any later version.
 *
 * 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 Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * In addition, as a special exception, the copyright holders give permission to
 * link this program with the OpenSSL project's "OpenSSL" library (or with
 * modified versions of it that use the same license as the "OpenSSL" library),
 * and distribute the linked executables. You must obey the GNU General Public
 * License in all respects for all of the code used other than "OpenSSL".  If you
 * modify file(s), you may extend this exception to your version of the file(s),
 * but you are not obligated to do so. If you do not wish to do so, delete this
 * exception statement from your version.
 */

#ifndef UTILS_MISC_H
#define UTILS_MISC_H

#include <QtGlobal>

#ifdef Q_OS_WIN
#include <memory>
#include <Windows.h>
#endif

#include <QString>

enum class ShutdownDialogAction;

/*  Miscellaneous functions that can be useful */

namespace Utils
{
    namespace Misc
    {
        // use binary prefix standards from IEC 60027-2
        // see http://en.wikipedia.org/wiki/Kilobyte
        enum class SizeUnit
        {
            Byte,       // 1024^0,
            KibiByte,   // 1024^1,
            MebiByte,   // 1024^2,
            GibiByte,   // 1024^3,
            TebiByte,   // 1024^4,
            PebiByte,   // 1024^5,
            ExbiByte    // 1024^6,
            // int64 is used for sizes and thus the next units can not be handled
            // ZebiByte,   // 1024^7,
            // YobiByte,   // 1024^8
        };

        QString parseHtmlLinks(const QString &rawText);

        void shutdownComputer(const ShutdownDialogAction &action);

        QString osName();
        QString boostVersionString();
        QString libtorrentVersionString();
        QString opensslVersionString();
        QString zlibVersionString();

        QString unitString(SizeUnit unit, bool isSpeed = false);

        // return the best user friendly storage unit (B, KiB, MiB, GiB, TiB)
        // value must be given in bytes
        QString friendlyUnit(qint64 bytesValue, bool isSpeed = false);
        int friendlyUnitPrecision(SizeUnit unit);
        qint64 sizeInBytes(qreal size, SizeUnit unit);

        bool isPreviewable(const QString &extension);

        // Take a number of seconds and return a user-friendly
        // time duration like "1d 2h 10m".
        QString userFriendlyDuration(qlonglong seconds, qlonglong maxCap = -1);
        QString getUserIDString();

#ifdef Q_OS_WIN
        QString windowsSystemPath();

        template <typename T>
        T loadWinAPI(const QString &source, const char *funcName)
        {
            QString path = windowsSystemPath();
            if (!path.endsWith('\\'))
                path += '\\';

            path += source;

            std::unique_ptr<wchar_t[]> pathWchar(new wchar_t[path.length() + 1] {});
            path.toWCharArray(pathWchar.get());

            return reinterpret_cast<T>(
                ::GetProcAddress(::LoadLibraryW(pathWchar.get()), funcName));
        }
#endif // Q_OS_WIN
    }
}

#endif // UTILS_MISC_H