/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtWebEngine module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
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** accordance with the commercial license agreement provided with the
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** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPLv3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
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** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or later as published by the Free
** Software Foundation and appearing in the file LICENSE.GPL included in
** the packaging of this file. Please review the following information to
** ensure the GNU General Public License version 2.0 requirements will be
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****************************************************************************/

#include "qwebenginedownloaditem.h"

#include "qwebenginedownloaditem_p.h"
#include "qwebengineprofile_p.h"

QT_BEGIN_NAMESPACE

static inline QWebEngineDownloadItem::DownloadState toDownloadState(int state)
{
    switch (state) {
    case BrowserContextAdapterClient::DownloadInProgress:
        return QWebEngineDownloadItem::DownloadInProgress;
    case BrowserContextAdapterClient::DownloadCompleted:
        return QWebEngineDownloadItem::DownloadCompleted;
    case BrowserContextAdapterClient::DownloadCancelled:
        return QWebEngineDownloadItem::DownloadCancelled;
    case BrowserContextAdapterClient::DownloadInterrupted:
        return QWebEngineDownloadItem::DownloadInterrupted;
    default:
        Q_UNREACHABLE();
        return QWebEngineDownloadItem::DownloadCancelled;
    }
}

/*!
    \class QWebEngineDownloadItem
    \brief The QWebEngineDownloadItem class provides information about a download.

    \since 5.5

    \inmodule QtWebEngineWidgets

    QWebEngineDownloadItem stores the state of a download to be used to manage requested downloads.
*/

QWebEngineDownloadItemPrivate::QWebEngineDownloadItemPrivate(QWebEngineProfilePrivate *p, const QUrl &url)
    : profile(p)
    , downloadFinished(false)
    , downloadId(-1)
    , downloadState(QWebEngineDownloadItem::DownloadCancelled)
    , downloadUrl(url)
    , totalBytes(-1)
    , receivedBytes(0)
{
}

QWebEngineDownloadItemPrivate::~QWebEngineDownloadItemPrivate()
{
    profile->downloadDestroyed(downloadId);
}

void QWebEngineDownloadItemPrivate::update(const BrowserContextAdapterClient::DownloadItemInfo &info)
{
    Q_Q(QWebEngineDownloadItem);

    Q_ASSERT(downloadState != QWebEngineDownloadItem::DownloadRequested);

    if (toDownloadState(info.state) != downloadState) {
        downloadState = toDownloadState(info.state);
        Q_EMIT q->stateChanged(downloadState);
    }

    if (info.receivedBytes != receivedBytes || info.totalBytes != totalBytes) {
        receivedBytes = info.receivedBytes;
        totalBytes = info.totalBytes;
        Q_EMIT q->downloadProgress(receivedBytes, totalBytes);
    }

    downloadFinished = downloadState != QWebEngineDownloadItem::DownloadInProgress;

    if (downloadFinished)
        Q_EMIT q->finished();
}

/*!
    Accepts the current download request, which will start the download.

    \sa finished(), stateChanged()
*/

void QWebEngineDownloadItem::accept()
{
    Q_D(QWebEngineDownloadItem);

    if (d->downloadState != QWebEngineDownloadItem::DownloadRequested)
        return;

    d->downloadState = QWebEngineDownloadItem::DownloadInProgress;
    Q_EMIT stateChanged(d->downloadState);
}

/*!
    Cancels the current download.

    \sa finished(), stateChanged()
*/

void QWebEngineDownloadItem::cancel()
{
    Q_D(QWebEngineDownloadItem);

    QWebEngineDownloadItem::DownloadState state = d->downloadState;

    if (state == QWebEngineDownloadItem::DownloadCompleted
            || state == QWebEngineDownloadItem::DownloadCancelled)
        return;

    d->downloadState = QWebEngineDownloadItem::DownloadCancelled;
    Q_EMIT stateChanged(d->downloadState);

    // We directly cancel the download request if the user cancels
    // before it even started, so no need to notify the profile here.
    if (state == QWebEngineDownloadItem::DownloadInProgress)
        d->profile->cancelDownload(d->downloadId);
}

/*!
    Returns the download item's id.
*/

quint32 QWebEngineDownloadItem::id()
{
    Q_D(QWebEngineDownloadItem);
    return d->downloadId;
}

/*!
    \fn QWebEngineDownloadItem::finished()

    This signal is emitted whenever the download finishes.

    \sa state(), isFinished()
*/

/*!
    \fn QWebEngineDownloadItem::stateChanged(DownloadState state)

    This signal is emitted whenever the download's \a state changes.

    \sa state(), QWebEngineDownloadItem::DownloadState
*/

/*!
    \fn QWebEngineDownloadItem::downloadProgress(qint64 bytesReceived, qint64 bytesTotal)

    This signal is emitted whenever the download's \a bytesReceived or
    \a bytesTotal changes.

    \sa totalBytes(), receivedBytes()
*/

/*!
    \enum QWebEngineDownloadItem::DownloadState

    This enum describes the state in which the download is in.

    \value DownloadRequested The download has been requested, but has not been accepted yet.
    \value DownloadInProgress The download is in progress.
    \value DownloadCompleted The download completed successfully.
    \value DownloadCancelled The download has been cancelled.
    \value DownloadInterrupted The download has been interrupted (by the server or because of lost connectivity).
*/

/*!
    Returns the download item's current state.

    \sa QWebEngineDownloadItem::DownloadState
*/

QWebEngineDownloadItem::DownloadState QWebEngineDownloadItem::state()
{
    Q_D(QWebEngineDownloadItem);
    return d->downloadState;
}

/*!
    Returns the download's total size in bytes.

    -1 means the size is unknown.
*/

qint64 QWebEngineDownloadItem::totalBytes()
{
    Q_D(QWebEngineDownloadItem);
    return d->totalBytes;
}

/*!
    Returns the download's bytes that have been received so far.

    -1 means the size is unknown.
*/

qint64 QWebEngineDownloadItem::receivedBytes()
{
    Q_D(QWebEngineDownloadItem);
    return d->receivedBytes;
}

/*!
    Returns the download's origin url.
*/

QUrl QWebEngineDownloadItem::url()
{
    Q_D(QWebEngineDownloadItem);
    return d->downloadUrl;
}

/*!
    Returns the download's full target path where it is being downloaded to.

    The path includes the file name. The default suggested path is the standard download location
    and file name is deduced not to overwrite already existing files.
*/

QString QWebEngineDownloadItem::path()
{
    Q_D(QWebEngineDownloadItem);
    return d->downloadPath;
}

/*!
    Sets the download's full target path, where the file should be downloaded to.

    The \a path should also include the file name. The download path can only be set in response
    to the QWebEngineProfile::downloadRequested() signal before the download is accepted.
    Past that point this function has no effect on the download item's state.
*/
void QWebEngineDownloadItem::setPath(QString path)
{
    Q_D(QWebEngineDownloadItem);
    if (d->downloadState != QWebEngineDownloadItem::DownloadRequested) {
        qWarning("Setting the download path is not allowed after the download has been accepted.");
        return;
    }

    d->downloadPath = path;
}

/*!
    Returns whether this download is finished (not in progress).

    \sa finished(), state(),
*/

bool QWebEngineDownloadItem::isFinished()
{
    Q_D(QWebEngineDownloadItem);
    return d->downloadFinished;
}

QWebEngineDownloadItem::QWebEngineDownloadItem(QWebEngineDownloadItemPrivate *p, QObject *parent)
    : QObject(parent)
    , d_ptr(p)
{
    p->q_ptr = this;
}

/*! \internal
*/
QWebEngineDownloadItem::~QWebEngineDownloadItem()
{
}

QT_END_NAMESPACE