/***************************************************************************
 *   KSystemLog, a system log viewer tool                                  *
 *   Copyright (C) 2007 by Nicolas Ternisien                               *
 *   nicolas.ternisien@gmail.com                                           *
 *                                                                         *
 *   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 "kioLogFileReader.h"

#include <QIODevice>

#include <kio/filejob.h>
#include <kio/job.h>

#include <kdirwatch.h>

#include "logFile.h"
#include "logging.h"

#define READ_SIZE 10

class KioLogFileReaderPrivate
{
public:
    KioLogFileReaderPrivate(const LogFile &file)
        : logFile(file)
        , fileJob(nullptr)
        , fileWatch(nullptr)
    {
    }

    LogFile logFile;

    KIO::FileJob *fileJob;

    QString buffer;
    qulonglong totalRead;

    KDirWatch *fileWatch;
};

KioLogFileReader::KioLogFileReader(const LogFile &logFile)
    : d(new KioLogFileReaderPrivate(logFile))
{
    d->fileJob = nullptr;
    d->totalRead = 0;

    d->fileWatch = new KDirWatch(this);

    connect(d->fileWatch, &KDirWatch::dirty, this, &KioLogFileReader::watchFile);
    d->fileWatch->addFile(logFile.url().path());
    /*
    d->fileWatch.setInterval(1000);
    connect(& (d->fileWatch), SIGNAL(timeout()), this, SLOT(watchFile()));
    */

    logDebug() << "Starting " << logFile.url().path();
}

KioLogFileReader::~KioLogFileReader()
{
    delete d;
}

void KioLogFileReader::open()
{
    logDebug() << "Opening...";
    d->fileJob = KIO::open(d->logFile.url(), QIODevice::ReadOnly | QIODevice::Text);

    connect(d->fileJob, &KIO::FileJob::open, this, &KioLogFileReader::openDone);
    connect(d->fileJob, SIGNAL(close(KIO::Job*)), this, SLOT(closeDone(KIO::Job*)));

    connect(d->fileJob, &KIO::FileJob::data, this,
            &KioLogFileReader::dataReceived);
    connect(d->fileJob, &KIO::FileJob::mimetype, this,
            &KioLogFileReader::mimetypeReceived);

    logDebug() << "File opened.";
}

void KioLogFileReader::close()
{
    d->fileJob->close();
}

void KioLogFileReader::openDone(KIO::Job * /*job*/)
{
    logDebug() << "Opening done...";

    d->fileJob->read(READ_SIZE);
}
void KioLogFileReader::closeDone(KIO::Job * /*job*/)
{
    logDebug() << "Closing done...";
}

void KioLogFileReader::dataReceived(KIO::Job *job, const QByteArray &data)
{
    if (job != d->fileJob) {
        logDebug() << "Not the good job";
        return;
    }

    if (data.isEmpty()) {
        return;
    }

    // logDebug() << "Receiving data... (" << d->totalRead << ")";
    d->buffer.append(QLatin1String(data));
    d->totalRead += data.size();

    emitCompleteLines();

    logDebug() << "Total read : " << d->totalRead << " of " << d->fileJob->size();
    if (d->totalRead < d->fileJob->size()) {
        d->fileJob->read(READ_SIZE);
    } else {
        logDebug() << "Entire file read, beginning file watching...";
        d->fileWatch->startScan();
    }

    // logDebug() << "Data received : " << d->buffer;

    // d->totalRead++;
}

void KioLogFileReader::emitCompleteLines()
{
    int endLinePos = d->buffer.indexOf(QLatin1String("\n"));
    forever {
        if (endLinePos == -1)
            break;

        emit lineRead(d->buffer.left(endLinePos));

        // Remove the emitted line and the end line character
        d->buffer.remove(0, endLinePos + 1);

        endLinePos = d->buffer.indexOf(QLatin1String("\n"));
    }

    // If this is the end line and it does not terminate by a \n, we return it
    if (d->totalRead == d->fileJob->size()) {
        emit lineRead(d->buffer);
        d->buffer.clear();
    }
}

void KioLogFileReader::mimetypeReceived(KIO::Job * /*job*/, const QString &type)
{
    logDebug() << "Mimetype received " << type;
}

void KioLogFileReader::watchFile(const QString &path)
{
    logDebug() << "Watch file : size : " << path;
}
