/***************************************************************************
 *                                                                         *
 *   Copyright (C) 2019 by Jean-Baptiste Mardelle (jb@kdenlive.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          *
 ***************************************************************************/

#include "transcodeclipjob.h"
#include "bin/bin.h"
#include "bin/clipcreator.hpp"
#include "bin/projectclip.h"
#include "bin/projectitemmodel.h"
#include "core.h"
#include "doc/kdenlivedoc.h"
#include "kdenlive_debug.h"
#include "kdenlivesettings.h"
#include "macros.hpp"

#include <QProcess>
#include <QTemporaryFile>
#include <QThread>

#include <klocalizedstring.h>

TranscodeJob::TranscodeJob(const QString &binId, QString params)
    : AbstractClipJob(TRANSCODEJOB, binId)
    , m_jobDuration(0)
    , m_isFfmpegJob(true)
    , m_jobProcess(nullptr)
    , m_done(false)
    , m_transcodeParams(params)
{
}

const QString TranscodeJob::getDescription() const
{
    //TODO: add better description after string freeze
    return i18n("Transcode");
}

bool TranscodeJob::startJob()
{
    auto binClip = pCore->projectItemModel()->getClipByBinID(m_clipId);
    const QString source = binClip->url();
    ClipType::ProducerType type = binClip->clipType();
    QString transcoderExt = m_transcodeParams.section(QLatin1String("%1"), 1).section(QLatin1Char(' '), 0, 0);
    if (transcoderExt.isEmpty()) {
        qDebug()<<"// INVALID TRANSCODING PROFILE";
        return false;
    }
    QFileInfo finfo(source);
    QString fileName = finfo.fileName().section(QLatin1Char('.'), 0, -2);
    QDir dir = finfo.absoluteDir();
    QString path = fileName + transcoderExt;
    int fileCount = 1;
    bool updatedPath = false;
    while (dir.exists(path)) {
        QString num = QString::number(fileCount).rightJustified(4, '0', false);
        path = fileName + num + transcoderExt;
        ++fileCount;
        updatedPath = true;
    }
    m_destUrl = dir.absoluteFilePath(fileName);
    if (updatedPath) {
        m_destUrl.append(QString::number(fileCount).rightJustified(4, '0', false));
    }

    bool result;
    if (type == ClipType::Playlist || type == ClipType::SlideShow) {
        // change FFmpeg params to MLT format
        m_isFfmpegJob = false;
        // insert transcoded filename
        m_transcodeParams.replace(QStringLiteral("%1"), QString("-consumer %1"));
        // Convert param style
        QStringList params = m_transcodeParams.split(QLatin1Char('-'), QString::SkipEmptyParts);
        QStringList mltParameters;
        for (const QString &s : params) {
            QString t = s.simplified();
            if (t.count(QLatin1Char(' ')) == 0) {
                t.append(QLatin1String("=1"));
            } else {
                if (t.contains(QLatin1String("%1"))) {
                    // file name
                    mltParameters.prepend(t.section(QLatin1Char(' '), 1).replace(QLatin1String("%1"), QString("avformat:%1").arg(m_destUrl)));
                    mltParameters.prepend(QStringLiteral("-consumer"));
                    continue;
                }
                if (t.startsWith(QLatin1String("aspect "))) {
                    // Fix aspect ratio calculation
                    t.replace(QLatin1Char(' '), QLatin1String("=@"));
                    t.replace(QLatin1Char(':'), QLatin1String("/"));
                } else {
                    t.replace(QLatin1Char(' '), QLatin1String("="));
                }
            }
            mltParameters << t;
        }
        int threadCount = QThread::idealThreadCount();
        if (threadCount > 2) {
            threadCount = qMin(threadCount - 1, 4);
        } else {
            threadCount = 1;
        }
        mltParameters.append(QStringLiteral("real_time=-%1").arg(threadCount));
        mltParameters.append(QStringLiteral("threads=%1").arg(threadCount));

        // Ask for progress reporting
        mltParameters << QStringLiteral("progress=1");
        mltParameters.prepend(source);
        m_jobProcess = new QProcess;
        // m_jobProcess->setProcessChannelMode(QProcess::MergedChannels);
        connect(this, &TranscodeJob::jobCanceled, m_jobProcess, &QProcess::kill, Qt::DirectConnection);
        connect(m_jobProcess, &QProcess::readyReadStandardError, this, &TranscodeJob::processLogInfo);
        m_jobProcess->start(KdenliveSettings::rendererpath(), mltParameters);
        m_jobProcess->waitForFinished(-1);
        result = m_jobProcess->exitStatus() == QProcess::NormalExit;
    } else {
        m_isFfmpegJob = true;
        QStringList parameters;
        if (KdenliveSettings::ffmpegpath().isEmpty()) {
            // FFmpeg not detected, cannot process the Job
            m_errorMessage.prepend(i18n("Failed to create proxy. FFmpeg not found, please set path in Kdenlive's settings Environment"));
            m_done = true;
            return false;
        }
        m_jobDuration = (int)binClip->duration().seconds();
        //parameters << QStringLiteral("-y");
        parameters << QStringLiteral("-stats") << QStringLiteral("-i") << source;
        // Only output error data
        parameters << QStringLiteral("-v") << QStringLiteral("error");
        QStringList params = m_transcodeParams.split(QLatin1Char(' '));
        QStringList finalParams{QStringLiteral("-i"),source};
        for (const QString &s : params) {
            QString t = s.simplified();
            if (t.startsWith(QLatin1String("%1"))) {
                parameters << t.replace(QLatin1String("%1"), m_destUrl);
            } else {
                parameters << t;
            }
        }
        qDebug()<<"/// FULL PROXY PARAMS:\n"<<parameters<<"\n------";
        m_jobProcess = new QProcess;
        // m_jobProcess->setProcessChannelMode(QProcess::MergedChannels);
        connect(m_jobProcess, &QProcess::readyReadStandardError, this, &TranscodeJob::processLogInfo);
        connect(this, &TranscodeJob::jobCanceled, m_jobProcess, &QProcess::kill, Qt::DirectConnection);
        m_jobProcess->start(KdenliveSettings::ffmpegpath(), parameters, QIODevice::ReadOnly);
        m_jobProcess->waitForFinished(-1);
        result = m_jobProcess->exitStatus() == QProcess::NormalExit;
    }
    m_destUrl.append(transcoderExt);
    // remove temporary playlist if it exists
    if (result) {
        if (QFileInfo(m_destUrl).size() == 0) {
            QFile::remove(m_destUrl);
            // File was not created
            m_done = false;
            m_errorMessage.append(i18n("Failed to create file."));
        } else {
            m_done = true;
        }
    } else {
        // Proxy process crashed
        QFile::remove(m_destUrl);
        m_done = false;
        m_errorMessage.append(QString::fromUtf8(m_jobProcess->readAll()));
    }
    m_jobProcess->deleteLater();
    return result;
}

void TranscodeJob::processLogInfo()
{
    const QString buffer = QString::fromUtf8(m_jobProcess->readAllStandardError());
    m_logDetails.append(buffer);
    int progress = 0;
    if (m_isFfmpegJob) {
        // Parse FFmpeg output
        if (m_jobDuration == 0) {
            if (buffer.contains(QLatin1String("Duration:"))) {
                QString data = buffer.section(QStringLiteral("Duration:"), 1, 1).section(QLatin1Char(','), 0, 0).simplified();
                if (!data.isEmpty()) {
                    QStringList numbers = data.split(QLatin1Char(':'));
                    if (numbers.size() < 3) {
                        return;
                    }
                    m_jobDuration = (int)(numbers.at(0).toInt() * 3600 + numbers.at(1).toInt() * 60 + numbers.at(2).toDouble());
                }
            }
        } else if (buffer.contains(QLatin1String("time="))) {
            QString time = buffer.section(QStringLiteral("time="), 1, 1).simplified().section(QLatin1Char(' '), 0, 0);
            if (!time.isEmpty()) {
                QStringList numbers = time.split(QLatin1Char(':'));
                if (numbers.size() < 3) {
                    progress = (int)time.toDouble();
                    if (progress == 0) {
                        return;
                    }
                } else {
                    progress = numbers.at(0).toInt() * 3600 + numbers.at(1).toInt() * 60 + numbers.at(2).toDouble();
                }
            }
            emit jobProgress((int)(100.0 * progress / m_jobDuration));
        }
    } else {
        // Parse MLT output
        if (buffer.contains(QLatin1String("percentage:"))) {
            progress = buffer.section(QStringLiteral("percentage:"), 1).simplified().section(QLatin1Char(' '), 0, 0).toInt();
            emit jobProgress(progress);
        }
    }
}

bool TranscodeJob::commitResult(Fun &undo, Fun &redo)
{
    Q_ASSERT(!m_resultConsumed);
    if (!m_done) {
        qDebug() << "ERROR: Trying to consume invalid results";
        return false;
    }
    m_resultConsumed = true;
    QString folderId = QStringLiteral("-1");
    auto id = ClipCreator::createClipFromFile(m_destUrl, folderId, pCore->projectItemModel(), undo, redo);
    return id != QStringLiteral("-1");
}
