/*
    QMPlay2 is a video and audio player.
    Copyright (C) 2010-2025  Błażej Szczygieł

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published
    by the Free Software Foundation, either version 3 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 Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <SRT.hpp>
#include <Functions.hpp>
#include <LibASS.hpp>

#include <QRegularExpression>
#include <QStringList>

#include <cstdio>

bool SRT::toASS(const QByteArray &srt, LibASS *ass, double)
{
    if (!ass)
        return false;

    bool ok = false;
    const char *scanfFmt = (srt.left(11 /* Including BOM */).contains("WEBVTT")) ? "%d:%d:%d.%d" : "%d:%d:%d,%d";

    for (const QString &entry : QString(QString("\n\n") + srt).remove('\r').split(QRegularExpression("\n\n+(\\d+\n)?"), Qt::SkipEmptyParts))
    {
        int idx = entry.indexOf('\n');
        if (idx > -1)
        {
            const QStringList time = entry.mid(0, idx).split(" --> ");
            if (time.size() == 2)
            {
                double time_double[2] = {-1.0, -1.0};
                for (int i = 0; i < 2; ++i)
                {
                    int h = -1, m = -1, s = -1, ms = -1;
                    sscanf(time[i].toLatin1().constData(), scanfFmt, &h, &m, &s, &ms);
                    if (h > -1 && m > -1 && s > -1 && ms > -1)
                        time_double[i] = h*3600 + m*60 + s + ms/1000.0;
                    else
                        break;
                }
                if (time_double[0] >= 0.0 && time_double[1] > time_double[0])
                {
                    if (!ok)
                    {
                        ass->initASS();
                        ok = true;
                    }
                    ass->addASSEvent(Functions::convertToASS(entry.mid(idx+1)), time_double[0], time_double[1]-time_double[0]);
                }
            }
        }
    }

    return ok;
}
