//    This file is part of JustMotion.

//    JustMotion 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 3 of the License, or
//    (at your option) any later version.

//    JustMotion 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.

#include "event_loop.h"

EventLoop::EventLoop(shared_t *sharedRes, QThread *thr, QObject *parent) : QObject(parent)
{
    shared    = sharedRes;
    heartBeat = 1;
    loopTimer = 0;

    connect(thr, &QThread::started,  this, &EventLoop::init);
    connect(thr, &QThread::finished, this, &EventLoop::deleteLater);

    moveToThread(thr);
}

void EventLoop::init()
{
    loopTimer = new QTimer(this);

    connect(loopTimer, &QTimer::timeout, this, &EventLoop::exec);

    loopTimer->setSingleShot(false);
    loopTimer->start(heartBeat * 1000);
}

QString EventLoop::statusLine()
{
    if (loopTimer->isActive())
    {
        return "OK  ";
    }
    else
    {
        return "FAIL";
    }
}

void EventLoop::updatePls()
{
    QString text;
    auto    txt = QTextStream(&text);

    txt << "#EXTM3U"                 << Qt::endl;
    txt << "#EXT-X-VERSION:3"        << Qt::endl;
    txt << "#EXT-X-TARGETDURATION:4" << Qt::endl;
    txt << "#EXT-X-MEDIA-SEQUENCE:0" << Qt::endl;

    auto vids = lsFilesInDir(shared->recPath + "/vid", shared->recExt);

    for (auto vid : vids)
    {
        txt << "#EXTINF:4.000000," << Qt::endl;
        txt << "vid/" << vid       << Qt::endl;
    }

    QFile file(shared->recPath + "/pls.m3u8");

    if (file.open(QFile::WriteOnly))
    {
        file.write(text.toUtf8());
    }

    file.close();
}

void EventLoop::exec()
{
    bool dirUpdated = false;

    if (!shared->recList.vidList.isEmpty())
    {
        auto vidPath = shared->recList.vidList.takeFirst();
        auto imgPath = shared->recList.imgList.takeFirst();
        auto vidDst  = shared->recPath + "/vid/" + QFileInfo(vidPath).fileName();
        auto imgDst  = shared->recPath + "/img/" + QFileInfo(imgPath).baseName() + shared->thumbExt;

        qInfo() << "---EVENT WRITEOUT START---";
        qInfo() << "source files: ";
        qInfo() << vidPath;
        qInfo() << imgPath;
        qInfo() << "destination files: ";
        qInfo() << vidDst;
        qInfo() << imgDst;

        mkPath(shared->recPath + "/vid");
        mkPath(shared->recPath + "/img");

        if (!QFile::copy(vidPath, vidDst))
        {
            qCritical() << "err: file copy operation failed." << Qt::endl;

            qInfo() << "exists?: " << vidPath << ": " << QFileInfo::exists(vidPath);
        }

        if (imgPath.endsWith(shared->thumbExt))
        {
            QFile::copy(imgPath, imgDst);
        }
        else
        {
            QStringList args;

            args << imgPath;
            args << imgDst;

            QProcess::execute("convert", args);
        }

        dirUpdated = true;

        qInfo() << "---EVENT WRITEOUT END---";
    }
    else
    {
        // maintain max live secs worth of image files in the img buffer folder.

        auto names = lsFilesInDir(shared->buffPath + "/img", ".bmp");

        if (names.size() > (shared->liveSecs / 3))
        {
            QFile::remove(shared->buffPath + "/img/" + names[0]);

            names.removeFirst();
        }

        // maintain max live secs worth of video files in the vid buffer folder.

        names = lsFilesInDir(shared->buffPath + "/vid", shared->streamExt);

        if (names.size() > (shared->liveSecs / 3))
        {
            QFile::remove(shared->buffPath + "/vid/" + names[0]);

            names.removeFirst();
        }
    }

    // maintain max byte size of the vid/img folder in the recording path.

    auto names = lsFilesInDir(shared->recPath + "/vid", shared->recExt);

    if (byteSize(shared->recPath) > shared->evtMaxBytes)
    {
        auto nameOnly = QFileInfo(shared->recPath + "/vid/" + names[0]).baseName();

        auto vidFile = shared->recPath + "/vid/" + nameOnly + shared->recExt;
        auto imgFile = shared->recPath + "/img/" + nameOnly + shared->thumbExt;

        QFile::remove(vidFile);
        QFile::remove(imgFile);

        names.removeFirst();

        dirUpdated = true;
    }

    if (dirUpdated)
    {
        updatePls();
    }
}