//    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 "record_loop.h"

RecordLoop::RecordLoop(shared_t *sharedRes, QThread *thr, QObject *parent) : QProcess(parent)
{
    checkTimer = 0;
    shared     = sharedRes;

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

    connect(this, &RecordLoop::readyReadStandardOutput, this, &RecordLoop::resetTime);
    connect(this, &RecordLoop::readyReadStandardError,  this, &RecordLoop::resetTime);
    connect(this, &RecordLoop::started,                 this, &RecordLoop::resetTime);
    connect(this, &RecordLoop::finished,                this, &RecordLoop::restart);

    moveToThread(thr);
}

RecordLoop::~RecordLoop()
{
    disconnect(this, &RecordLoop::finished, this, &RecordLoop::restart);

    terminate();
    waitForFinished();
}

void RecordLoop::init()
{
    checkTimer = new QTimer(this);
    mkdirTimer = new QTimer(this);
    sync       = false;

    connect(checkTimer, &QTimer::timeout, this, &RecordLoop::restart);
    connect(mkdirTimer, &QTimer::timeout, this, &RecordLoop::mkdirs);

    connect(this, &RecordLoop::finished, mkdirTimer, &QTimer::stop);
    connect(this, &RecordLoop::finished, checkTimer, &QTimer::stop);

    mkdirTimer->setInterval(60000);
    checkTimer->setInterval(60000);
    // stall timeout. ffmpeg has a tendency to just 'stop.' meaning it would just stop
    // reording at random times without stop signals or even error messages. this timer,
    // monitors for any text output from ffmpeg. if no updates in 60000 msecs, it will
    // automatically restart ffmpeg.

    setupBuffDir(shared->buffPath);
    restart();
}

void RecordLoop::mkdirs()
{
    auto timeStamp = QDateTime::currentDateTime();
    auto path1     = shared->buffPath + "/vid/" + timeStamp.toString(DATETIME_FMT);

    timeStamp = timeStamp.addSecs(60);

    auto path2 = shared->buffPath + "/vid/" + timeStamp.toString(DATETIME_FMT);

    if (!QFileInfo(path1).exists()) QDir().mkpath(path1);
    if (!QFileInfo(path2).exists()) QDir().mkpath(path2);
}

QString RecordLoop::camCmdFromConf()
{
    auto ret = "ffmpeg -hide_banner -y -i '" + shared->recordUri + "' -strftime 1 -strftime_mkdir 1 ";

    if (shared->recordUri.contains("rtsp"))
    {
        ret += "-rtsp_transport udp ";
    }

    if (shared->vidCodec != "copy")
    {
        ret += "-vf fps=" + QString::number(shared->recFps) + ",scale=" + shared->recScale + " ";
    }

    auto maxClips = (60 / shared->liveClipSecs) * shared->liveMins;

    ret += "-vcodec " + shared->vidCodec + " ";
    ret += "-acodec " + shared->audCodec + " ";
    ret += "-hls_time " + QString::number(shared->liveClipSecs) + " -hls_list_size " + QString::number(maxClips) + " ";
    ret += "-hls_flags delete_segments -hls_segment_filename vid/" + QString(STRFTIME_FMT) + "/%S" + shared->streamExt + " ";
    ret += "pls.m3u8";

    qInfo() << ret;

    return ret;
}

QString RecordLoop::statusLine()
{
    if (!sync)
    {
        return "WAIT    ";
    }
    else
    {
        return getStatLineFromProc(this);
    }
}

void RecordLoop::synced()
{
    sync = true;

    restart();
}

void RecordLoop::resetTime()
{
    // reset the stall timer to prevent it from timing out when ffmpeg doesn't
    // need to be restarted.

    checkTimer->start();
}

void RecordLoop::restart()
{
    auto sec = QTime::currentTime().second();

    if (state() == QProcess::Running)
    {
        terminate();
    }
    else if (!sync && (sec != 0))
    {
        // start recording when the seconds mark hit zero in real life.

        QTimer::singleShot((60 - sec) * 1000, this, &RecordLoop::synced);
    }
    else
    {
        auto cmdLine = camCmdFromConf();
        auto args    = parseArgs(cmdLine.toUtf8(), -1);

        //qInfo() << "start recording command: " << cmdLine;

        if (args.isEmpty())
        {
            qCritical() << "err: couldn't parse a program name";
        }
        else
        {
            setWorkingDirectory(shared->buffPath);
            setProgram(args[0]);
            setArguments(args.mid(1));
            mkdirs();

            mkdirTimer->start();

            start();
        }
    }
}