/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtNetwork module of the Qt Toolkit.
**
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** General Public License version 3 as published by the Free Software
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** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
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** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
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****************************************************************************/

#include "qnetworkreplyfileimpl_p.h"

#include "QtCore/qdatetime.h"
#include <QtCore/QCoreApplication>
#include <QtCore/QFileInfo>

QT_BEGIN_NAMESPACE

QNetworkReplyFileImplPrivate::QNetworkReplyFileImplPrivate()
    : QNetworkReplyPrivate(), realFileSize(0)
{
}

QNetworkReplyFileImpl::~QNetworkReplyFileImpl()
{
}

QNetworkReplyFileImpl::QNetworkReplyFileImpl(QObject *parent, const QNetworkRequest &req, const QNetworkAccessManager::Operation op)
    : QNetworkReply(*new QNetworkReplyFileImplPrivate(), parent)
{
    setRequest(req);
    setUrl(req.url());
    setOperation(op);
    setFinished(true);
    QNetworkReply::open(QIODevice::ReadOnly);

    QNetworkReplyFileImplPrivate *d = (QNetworkReplyFileImplPrivate*) d_func();

    QUrl url = req.url();
    if (url.host() == QLatin1String("localhost"))
        url.setHost(QString());

#if !defined(Q_OS_WIN)
    // do not allow UNC paths on Unix
    if (!url.host().isEmpty()) {
        // we handle only local files
        QString msg = QCoreApplication::translate("QNetworkAccessFileBackend", "Request for opening non-local file %1").arg(url.toString());
        setError(QNetworkReply::ProtocolInvalidOperationError, msg);
        QMetaObject::invokeMethod(this, "error", Qt::QueuedConnection,
            Q_ARG(QNetworkReply::NetworkError, QNetworkReply::ProtocolInvalidOperationError));
        QMetaObject::invokeMethod(this, "finished", Qt::QueuedConnection);
        return;
    }
#endif
    if (url.path().isEmpty())
        url.setPath(QLatin1String("/"));
    setUrl(url);


    QString fileName = url.toLocalFile();
    if (fileName.isEmpty()) {
        const QString scheme = url.scheme();
        if (scheme == QLatin1String("qrc")) {
            fileName = QLatin1Char(':') + url.path();
        } else {
#if defined(Q_OS_ANDROID)
            if (scheme == QLatin1String("assets"))
                fileName = QLatin1String("assets:") + url.path();
            else
#endif
                fileName = url.toString(QUrl::RemoveAuthority | QUrl::RemoveFragment | QUrl::RemoveQuery);
        }
    }

    QFileInfo fi(fileName);
    if (fi.isDir()) {
        QString msg = QCoreApplication::translate("QNetworkAccessFileBackend", "Cannot open %1: Path is a directory").arg(url.toString());
        setError(QNetworkReply::ContentOperationNotPermittedError, msg);
        QMetaObject::invokeMethod(this, "error", Qt::QueuedConnection,
            Q_ARG(QNetworkReply::NetworkError, QNetworkReply::ContentOperationNotPermittedError));
        QMetaObject::invokeMethod(this, "finished", Qt::QueuedConnection);
        return;
    }

    d->realFile.setFileName(fileName);
    bool opened = d->realFile.open(QIODevice::ReadOnly | QIODevice::Unbuffered);

    // could we open the file?
    if (!opened) {
        QString msg = QCoreApplication::translate("QNetworkAccessFileBackend", "Error opening %1: %2")
                .arg(d->realFile.fileName(), d->realFile.errorString());

        if (d->realFile.exists()) {
            setError(QNetworkReply::ContentAccessDenied, msg);
            QMetaObject::invokeMethod(this, "error", Qt::QueuedConnection,
                Q_ARG(QNetworkReply::NetworkError, QNetworkReply::ContentAccessDenied));
        } else {
            setError(QNetworkReply::ContentNotFoundError, msg);
            QMetaObject::invokeMethod(this, "error", Qt::QueuedConnection,
                Q_ARG(QNetworkReply::NetworkError, QNetworkReply::ContentNotFoundError));
        }
        QMetaObject::invokeMethod(this, "finished", Qt::QueuedConnection);
        return;
    }

    setHeader(QNetworkRequest::LastModifiedHeader, fi.lastModified());
    d->realFileSize = fi.size();
    setHeader(QNetworkRequest::ContentLengthHeader, d->realFileSize);

    QMetaObject::invokeMethod(this, "metaDataChanged", Qt::QueuedConnection);
    QMetaObject::invokeMethod(this, "downloadProgress", Qt::QueuedConnection,
        Q_ARG(qint64, d->realFileSize), Q_ARG(qint64, d->realFileSize));
    QMetaObject::invokeMethod(this, "readyRead", Qt::QueuedConnection);
    QMetaObject::invokeMethod(this, "finished", Qt::QueuedConnection);
}

void QNetworkReplyFileImpl::close()
{
    Q_D(QNetworkReplyFileImpl);
    QNetworkReply::close();
    d->realFile.close();
}

void QNetworkReplyFileImpl::abort()
{
    Q_D(QNetworkReplyFileImpl);
    QNetworkReply::close();
    d->realFile.close();
}

qint64 QNetworkReplyFileImpl::bytesAvailable() const
{
    Q_D(const QNetworkReplyFileImpl);
    if (!d->realFile.isOpen())
        return QNetworkReply::bytesAvailable();
    return QNetworkReply::bytesAvailable() + d->realFile.bytesAvailable();
}

bool QNetworkReplyFileImpl::isSequential () const
{
    return true;
}

qint64 QNetworkReplyFileImpl::size() const
{
    Q_D(const QNetworkReplyFileImpl);
    return d->realFileSize;
}

/*!
    \internal
*/
qint64 QNetworkReplyFileImpl::readData(char *data, qint64 maxlen)
{
    Q_D(QNetworkReplyFileImpl);
    if (!d->realFile.isOpen())
        return -1;
    qint64 ret = d->realFile.read(data, maxlen);
    if (bytesAvailable() == 0 && d->realFile.isOpen())
        d->realFile.close();
    if (ret == 0 && bytesAvailable() == 0)
        return -1;
    else {
        setAttribute(QNetworkRequest::HttpStatusCodeAttribute, 200);
        setAttribute(QNetworkRequest::HttpReasonPhraseAttribute, QLatin1String("OK"));
        return ret;
    }
}


QT_END_NAMESPACE

#include "moc_qnetworkreplyfileimpl_p.cpp"