/*
    This file is part of the KDE libraries
    Copyright (C) 1997 Torben Weis (weis@kde.org)
    Copyright (C) 1998 Matthias Ettrich (ettrich@kde.org)
    Copyright (C) 1999 David Faure (faure@kde.org)

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library 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
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
*/

#include "netaccess.h"

#include <stdlib.h>
#include <stdio.h>
#include <signal.h>
#include <unistd.h>

#include <cstring>

#include <QCharRef>
#include <QApplication>
#include <QFile>
#include <QFileInfo>
#include <QMetaClassInfo>
#include <QTextStream>
#include <QDataStream>
#include <qtemporaryfile.h>

#include <klocalizedstring.h>
#include <kjobwidgets.h>

#include "kio/job.h"
#include "kio/mkdirjob.h"
#include "kio/copyjob.h"
#include "kio/deletejob.h"
#include "kio/scheduler.h"

namespace KIO
{
class NetAccessPrivate
{
public:
    NetAccessPrivate()
        : m_metaData(nullptr)
        , bJobOK(true)
    {}
    UDSEntry m_entry;
    QString m_mimetype;
    QByteArray m_data;
    QUrl m_url;
    QMap<QString, QString> *m_metaData;

    /**
     * Whether the download succeeded or not
     */
    bool bJobOK;
};

} // namespace KIO

using namespace KIO;

/**
 * List of temporary files
 */
static QStringList *tmpfiles;

static QString *lastErrorMsg = nullptr;
static int lastErrorCode = 0;

NetAccess::NetAccess() :
    d(new NetAccessPrivate)
{
}

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

bool NetAccess::download(const QUrl &u, QString &target, QWidget *window)
{
    if (u.isLocalFile()) {
        // file protocol. We do not need the network
        target = u.toLocalFile();
        const bool readable = QFileInfo(target).isReadable();
        if (!readable) {
            if (!lastErrorMsg) {
                lastErrorMsg = new QString;
            }
            *lastErrorMsg = i18n("File '%1' is not readable", target);
            lastErrorCode = ERR_COULD_NOT_READ;
        }
        return readable;
    }

    if (target.isEmpty()) {
        QTemporaryFile tmpFile;
        tmpFile.setAutoRemove(false);
        tmpFile.open();
        target = tmpFile.fileName();
        if (!tmpfiles) {
            tmpfiles = new QStringList;
        }
        tmpfiles->append(target);
    }

    NetAccess kioNet;
    const QUrl dest = QUrl::fromLocalFile(target);
    return kioNet.filecopyInternal(u, dest, -1, KIO::Overwrite, window, false /*copy*/);
}

bool NetAccess::upload(const QString &src, const QUrl &target, QWidget *window)
{
    if (target.isEmpty()) {
        return false;
    }

    // If target is local... well, just copy. This can be useful
    // when the client code uses a temp file no matter what.
    // Let's make sure it's not the exact same file though
    if (target.isLocalFile() && target.toLocalFile() == src) {
        return true;
    }

    NetAccess kioNet;
    const QUrl srcUrl = QUrl::fromLocalFile(src);
    return kioNet.filecopyInternal(srcUrl, target, -1, KIO::Overwrite, window, false /*copy*/);
}

#ifndef KDELIBS4SUPPORT_NO_DEPRECATED
bool NetAccess::file_copy(const QUrl &src, const QUrl &target, QWidget *window)
{
    NetAccess kioNet;
    return kioNet.filecopyInternal(src, target, -1, KIO::DefaultFlags,
                                   window, false /*copy*/);
}
#endif

#ifndef KDELIBS4SUPPORT_NO_DEPRECATED
bool NetAccess::copy(const QUrl &src, const QUrl &target, QWidget *window)
{
    return file_copy(src, target, window);
}
#endif

#ifndef KDELIBS4SUPPORT_NO_DEPRECATED
bool NetAccess::dircopy(const QUrl &src, const QUrl &target, QWidget *window)
{
    QList<QUrl> srcList;
    srcList.append(src);
    return NetAccess::dircopy(srcList, target, window);
}
#endif

#ifndef KDELIBS4SUPPORT_NO_DEPRECATED
bool NetAccess::dircopy(const QList<QUrl> &srcList, const QUrl &target, QWidget *window)
{
    NetAccess kioNet;
    return kioNet.dircopyInternal(srcList, target, window, false /*copy*/);
}
#endif

#ifndef KDELIBS4SUPPORT_NO_DEPRECATED
bool NetAccess::move(const QUrl &src, const QUrl &target, QWidget *window)
{
    QList<QUrl> srcList;
    srcList.append(src);
    NetAccess kioNet;
    return kioNet.dircopyInternal(srcList, target, window, true /*move*/);
}
#endif

#ifndef KDELIBS4SUPPORT_NO_DEPRECATED
bool NetAccess::move(const QList<QUrl> &srcList, const QUrl &target, QWidget *window)
{
    NetAccess kioNet;
    return kioNet.dircopyInternal(srcList, target, window, true /*move*/);
}
#endif

#ifndef KDELIBS4SUPPORT_NO_DEPRECATED
bool NetAccess::exists(const QUrl &url, bool source, QWidget *window)
{
    if (url.isLocalFile()) {
        return QFile::exists(url.toLocalFile());
    }
    NetAccess kioNet;
    return kioNet.statInternal(url, 0 /*no details*/,
                               source ? SourceSide : DestinationSide, window);
}
#endif

bool NetAccess::exists(const QUrl &url, StatSide side, QWidget *window)
{
    if (url.isLocalFile()) {
        return QFile::exists(url.toLocalFile());
    }
    NetAccess kioNet;
    return kioNet.statInternal(url, 0 /*no details*/, side, window);
}

bool NetAccess::stat(const QUrl &url, KIO::UDSEntry &entry, QWidget *window)
{
    NetAccess kioNet;
    bool ret = kioNet.statInternal(url, 2 /*all details*/, SourceSide, window);
    if (ret) {
        entry = kioNet.d->m_entry;
    }
    return ret;
}

QUrl NetAccess::mostLocalUrl(const QUrl &url, QWidget *window)
{
    if (url.isLocalFile()) {
        return url;
    }

    KIO::UDSEntry entry;
    if (!stat(url, entry, window)) {
        return url;
    }

    const QString path = entry.stringValue(KIO::UDSEntry::UDS_LOCAL_PATH);
    if (!path.isEmpty()) {
        QUrl new_url = QUrl::fromLocalFile(path);
        return new_url;
    }

    return url;
}

#ifndef KDELIBS4SUPPORT_NO_DEPRECATED
bool NetAccess::del(const QUrl &url, QWidget *window)
{
    NetAccess kioNet;
    return kioNet.delInternal(url, window);
}
#endif

#ifndef KDELIBS4SUPPORT_NO_DEPRECATED
bool NetAccess::mkdir(const QUrl &url, QWidget *window, int permissions)
{
    NetAccess kioNet;
    return kioNet.mkdirInternal(url, permissions, window);
}
#endif

QString NetAccess::fish_execute(const QUrl &url, const QString &command, QWidget *window)
{
    NetAccess kioNet;
    return kioNet.fish_executeInternal(url, command, window);
}

bool NetAccess::synchronousRun(Job *job, QWidget *window, QByteArray *data,
                               QUrl *finalURL, QMap<QString, QString> *metaData)
{
    NetAccess kioNet;
    // Disable autodeletion until we are back from this event loop (#170963)
    // We just have to hope people don't mess with setAutoDelete in slots connected to the job, though.
    const bool wasAutoDelete = job->isAutoDelete();
    job->setAutoDelete(false);
    const bool ok = kioNet.synchronousRunInternal(job, window, data, finalURL, metaData);
    if (wasAutoDelete) {
        job->deleteLater();
    }
    return ok;
}

QString NetAccess::mimetype(const QUrl &url, QWidget *window)
{
    NetAccess kioNet;
    return kioNet.mimetypeInternal(url, window);
}

QString NetAccess::lastErrorString()
{
    return lastErrorMsg ? *lastErrorMsg : QString();
}

int NetAccess::lastError()
{
    return lastErrorCode;
}

void NetAccess::removeTempFile(const QString &name)
{
    if (!tmpfiles) {
        return;
    }
    if (tmpfiles->contains(name)) {
        QFile::remove(name);
        tmpfiles->removeAll(name);
    }
}

bool NetAccess::filecopyInternal(const QUrl &src, const QUrl &target, int permissions,
                                 KIO::JobFlags flags, QWidget *window, bool move)
{
    d->bJobOK = true; // success unless further error occurs

    KIO::Scheduler::checkSlaveOnHold(true);
    KIO::Job *job = move
                    ? KIO::file_move(src, target, permissions, flags)
                    : KIO::file_copy(src, target, permissions, flags);
    KJobWidgets::setWindow(job, window);
    connect(job, SIGNAL(result(KJob*)),
            this, SLOT(slotResult(KJob*)));

    enter_loop();
    return d->bJobOK;
}

bool NetAccess::dircopyInternal(const QList<QUrl> &src, const QUrl &target,
                                QWidget *window, bool move)
{
    d->bJobOK = true; // success unless further error occurs

    KIO::Job *job = move
                    ? KIO::move(src, target)
                    : KIO::copy(src, target);
    KJobWidgets::setWindow(job, window);
    connect(job, SIGNAL(result(KJob*)),
            this, SLOT(slotResult(KJob*)));

    enter_loop();
    return d->bJobOK;
}

bool NetAccess::statInternal(const QUrl &url, int details, StatSide side,
                             QWidget *window)
{
    d->bJobOK = true; // success unless further error occurs
    KIO::JobFlags flags = url.isLocalFile() ? KIO::HideProgressInfo : KIO::DefaultFlags;
    KIO::StatJob *job = KIO::stat(url, flags);
    KJobWidgets::setWindow(job, window);
    job->setDetails(details);
    job->setSide(side == SourceSide ? StatJob::SourceSide : StatJob::DestinationSide);
    connect(job, SIGNAL(result(KJob*)),
            this, SLOT(slotResult(KJob*)));
    enter_loop();
    return d->bJobOK;
}

bool NetAccess::delInternal(const QUrl &url, QWidget *window)
{
    d->bJobOK = true; // success unless further error occurs
    KIO::Job *job = KIO::del(url);
    KJobWidgets::setWindow(job, window);
    connect(job, SIGNAL(result(KJob*)),
            this, SLOT(slotResult(KJob*)));
    enter_loop();
    return d->bJobOK;
}

bool NetAccess::mkdirInternal(const QUrl &url, int permissions,
                              QWidget *window)
{
    d->bJobOK = true; // success unless further error occurs
    KIO::Job *job = KIO::mkdir(url, permissions);
    KJobWidgets::setWindow(job, window);
    connect(job, SIGNAL(result(KJob*)),
            this, SLOT(slotResult(KJob*)));
    enter_loop();
    return d->bJobOK;
}

QString NetAccess::mimetypeInternal(const QUrl &url, QWidget *window)
{
    d->bJobOK = true; // success unless further error occurs
    d->m_mimetype = QLatin1String("unknown");
    KIO::Job *job = KIO::mimetype(url);
    KJobWidgets::setWindow(job, window);
    connect(job, SIGNAL(result(KJob*)),
            this, SLOT(slotResult(KJob*)));
    connect(job, SIGNAL(mimetype(KIO::Job*,QString)),
            this, SLOT(slotMimetype(KIO::Job*,QString)));
    enter_loop();
    return d->m_mimetype;
}

void NetAccess::slotMimetype(KIO::Job *, const QString &type)
{
    d->m_mimetype = type;
}

QString NetAccess::fish_executeInternal(const QUrl &url, const QString &command, QWidget *window)
{
    QString target, remoteTempFileName, resultData;
    QTemporaryFile tmpFile;
    tmpFile.open();

    if (url.scheme() == "fish") {
        // construct remote temp filename
        QUrl tempPathUrl = url;
        remoteTempFileName = tmpFile.fileName();
        // We only need the filename. The directory might not exist on the remote side.
        int pos = remoteTempFileName.lastIndexOf('/');
        remoteTempFileName = "/tmp/fishexec_" + remoteTempFileName.mid(pos + 1);
        tempPathUrl.setPath(remoteTempFileName);
        d->bJobOK = true; // success unless further error occurs
        QByteArray packedArgs;
        QDataStream stream(&packedArgs, QIODevice::WriteOnly);

        stream << int('X') << tempPathUrl << command;

        KIO::Job *job = KIO::special(tempPathUrl, packedArgs);
        KJobWidgets::setWindow(job, window);
        connect(job, SIGNAL(result(KJob*)),
                this, SLOT(slotResult(KJob*)));
        enter_loop();

        // since the KIO::special does not provide feedback we need to download the result
        if (NetAccess::download(tempPathUrl, target, window)) {
            QFile resultFile(target);

            if (resultFile.open(QIODevice::ReadOnly)) {
                QTextStream ts(&resultFile);   // default encoding is Locale
                resultData = ts.readAll();
                resultFile.close();
                NetAccess::del(tempPathUrl, window);
            }
        }
    } else {
        resultData = i18n("ERROR: Unknown protocol '%1'", url.scheme());
    }
    return resultData;
}

bool NetAccess::synchronousRunInternal(Job *job, QWidget *window, QByteArray *data,
                                       QUrl *finalURL, QMap<QString, QString> *metaData)
{
    KJobWidgets::setWindow(job, window);

    d->m_metaData = metaData;
    if (d->m_metaData) {
        for (QMap<QString, QString>::iterator it = d->m_metaData->begin(); it != d->m_metaData->end(); ++it) {
            job->addMetaData(it.key(), it.value());
        }
    }

    if (finalURL) {
        SimpleJob *sj = qobject_cast<SimpleJob *>(job);
        if (sj) {
            d->m_url = sj->url();
        }
    }

    connect(job, SIGNAL(result(KJob*)),
            this, SLOT(slotResult(KJob*)));

    const QMetaObject *meta = job->metaObject();

    static const char dataSignal[] = "data(KIO::Job*,QByteArray)";
    if (meta->indexOfSignal(dataSignal) != -1) {
        connect(job, SIGNAL(data(KIO::Job*,QByteArray)),
                this, SLOT(slotData(KIO::Job*,QByteArray)));
    }

    static const char redirSignal[] = "redirection(KIO::Job*,QUrl)";
    if (meta->indexOfSignal(redirSignal) != -1) {
        connect(job, SIGNAL(redirection(KIO::Job*,QUrl)),
                this, SLOT(slotRedirection(KIO::Job*,QUrl)));
    }

    enter_loop();

    if (finalURL) {
        *finalURL = d->m_url;
    }
    if (data) {
        *data = d->m_data;
    }

    return d->bJobOK;
}

void NetAccess::enter_loop()
{
    QEventLoop eventLoop;
    connect(this, SIGNAL(leaveModality()),
            &eventLoop, SLOT(quit()));
    eventLoop.exec(QEventLoop::ExcludeUserInputEvents);
}

void NetAccess::slotResult(KJob *job)
{
    lastErrorCode = job->error();
    d->bJobOK = !job->error();
    if (!d->bJobOK) {
        if (!lastErrorMsg) {
            lastErrorMsg = new QString;
        }
        *lastErrorMsg = job->errorString();
    }
    KIO::StatJob *statJob = qobject_cast<KIO::StatJob *>(job);
    if (statJob) {
        d->m_entry = statJob->statResult();
    }

    KIO::Job *kioJob = qobject_cast<KIO::Job *>(job);
    if (kioJob && d->m_metaData) {
        *d->m_metaData = kioJob->metaData();
    }

    emit leaveModality();
}

void NetAccess::slotData(KIO::Job *, const QByteArray &data)
{
    if (data.isEmpty()) {
        return;
    }

    unsigned offset = d->m_data.size();
    d->m_data.resize(offset + data.size());
    std::memcpy(d->m_data.data() + offset, data.data(), data.size());
}

void NetAccess::slotRedirection(KIO::Job *, const QUrl &url)
{
    d->m_url = url;
}

