// SPDX-FileCopyrightText: 2010 Jeremy Lainé <jeremy.laine@m4x.org>
// SPDX-FileCopyrightText: 2022 Melvin Keskin <melvo@olomono.de>
//
// SPDX-License-Identifier: LGPL-2.1-or-later

#include "QXmppJingleIq.h"

#include "QXmppConstants_p.h"
#include "QXmppUtils.h"

#include <QDate>
#include <QDateTime>
#include <QDomElement>
#include <QRegularExpression>

static const int RTP_COMPONENT = 1;

static const char *jingle_actions[] = {
    "content-accept",
    "content-add",
    "content-modify",
    "content-reject",
    "content-remove",
    "description-info",
    "security-info",
    "session-accept",
    "session-info",
    "session-initiate",
    "session-terminate",
    "transport-accept",
    "transport-info",
    "transport-reject",
    "transport-replace",
};

static const char *jingle_reasons[] = {
    "",
    "alternative-session",
    "busy",
    "cancel",
    "connectivity-error",
    "decline",
    "expired",
    "failed-application",
    "failed-transport",
    "general-error",
    "gone",
    "incompatible-parameters",
    "media-error",
    "security-error",
    "success",
    "timeout",
    "unsupported-applications",
    "unsupported-transports",
};

static const QStringList JINGLE_RTP_ERROR_CONDITIONS = {
    {},
    QStringLiteral("invalid-crypto"),
    QStringLiteral("crypto-required")
};

static const QStringList JINGLE_RTP_HEADER_EXTENSIONS_SENDERS = {
    QStringLiteral("both"),
    QStringLiteral("initiator"),
    QStringLiteral("responder")
};

static QString formatFingerprint(const QByteArray &digest)
{
    QString fingerprint;
    const QString hx = digest.toHex().toUpper();
    for (int i = 0; i < hx.size(); i += 2) {
        if (!fingerprint.isEmpty()) {
            fingerprint += ':';
        }
        fingerprint += hx.mid(i, 2);
    }
    return fingerprint;
}

static QByteArray parseFingerprint(const QString &fingerprint)
{
    QString z = fingerprint;
    z.replace(':', "");
    return QByteArray::fromHex(z.toUtf8());
}

static QString addressToSdp(const QHostAddress &host)
{
    return QStringLiteral("IN %1 %2").arg(host.protocol() == QAbstractSocket::IPv6Protocol ? QStringLiteral("IP6") : QStringLiteral("IP4"), host.toString());
}

static bool candidateParseSdp(QXmppJingleCandidate *candidate, const QString &sdp)
{
    if (!sdp.startsWith(QStringLiteral("candidate:"))) {
        return false;
    }

    const QStringList bits = sdp.mid(10).split(" ");
    if (bits.size() < 6) {
        return false;
    }

    candidate->setFoundation(bits[0]);
    candidate->setComponent(bits[1].toInt());
    candidate->setProtocol(bits[2].toLower());
    candidate->setPriority(bits[3].toInt());
    candidate->setHost(QHostAddress(bits[4]));
    candidate->setPort(bits[5].toInt());
    for (int i = 6; i < bits.size() - 1; i += 2) {
        if (bits[i] == QStringLiteral("typ")) {
            bool ok;
            candidate->setType(QXmppJingleCandidate::typeFromString(bits[i + 1], &ok));
            if (!ok) {
                return false;
            }
        } else if (bits[i] == QStringLiteral("generation")) {
            candidate->setGeneration(bits[i + 1].toInt());
        } else {
            qWarning() << "Candidate SDP contains unknown attribute" << bits[i];
            return false;
        }
    }
    return true;
}

static QString candidateToSdp(const QXmppJingleCandidate &candidate)
{
    return QStringLiteral("candidate:%1 %2 %3 %4 %5 %6 typ %7 generation %8").arg(candidate.foundation(), QString::number(candidate.component()), candidate.protocol(), QString::number(candidate.priority()), candidate.host().toString(), QString::number(candidate.port()), QXmppJingleCandidate::typeToString(candidate.type()), QString::number(candidate.generation()));
}

// Parses all found SDP parameter elements of parent into parameters.
static void parseSdpParameters(const QDomElement &parent, QVector<QXmppSdpParameter> &parameters)
{
    for (auto childElement = parent.firstChildElement();
         !childElement.isNull();
         childElement = childElement.nextSiblingElement()) {
        if (QXmppSdpParameter::isSdpParameter(childElement)) {
            QXmppSdpParameter parameter;
            parameter.parse(childElement);
            parameters.append(parameter);
        }
    }
}

// Serializes the SDP parameters.
static void sdpParametersToXml(QXmlStreamWriter *writer, const QVector<QXmppSdpParameter> &parameters)
{
    for (const auto &parameter : parameters) {
        parameter.toXml(writer);
    }
}

// Parses all found RTP Feedback Negotiation elements inside of parent into properties and
// intervals.
static void parseJingleRtpFeedbackNegotiationElements(const QDomElement &parent, QVector<QXmppJingleRtpFeedbackProperty> &properties, QVector<QXmppJingleRtpFeedbackInterval> &intervals)
{
    for (auto child = parent.firstChildElement();
         !child.isNull();
         child = child.nextSiblingElement()) {
        if (QXmppJingleRtpFeedbackProperty::isJingleRtpFeedbackProperty(child)) {
            QXmppJingleRtpFeedbackProperty property;
            property.parse(child);
            properties.append(property);
        } else if (QXmppJingleRtpFeedbackInterval::isJingleRtpFeedbackInterval(child)) {
            QXmppJingleRtpFeedbackInterval interval;
            interval.parse(child);
            intervals.append(interval);
        }
    }
}

// Serializes the RTP feedback properties and intervals.
static void jingleRtpFeedbackNegotiationElementsToXml(QXmlStreamWriter *writer, const QVector<QXmppJingleRtpFeedbackProperty> &properties, const QVector<QXmppJingleRtpFeedbackInterval> &intervals)
{
    for (const auto &property : properties) {
        property.toXml(writer);
    }

    for (const auto &interval : intervals) {
        interval.toXml(writer);
    }
}

// Parses all found RTP Header Extensions Negotiation elements inside of parent into properties and
// isRtpHeaderExtensionMixingAllowed.
static void parseJingleRtpHeaderExtensionsNegotiationElements(const QDomElement &parent, QVector<QXmppJingleRtpHeaderExtensionProperty> &properties, bool &isRtpHeaderExtensionMixingAllowed)
{
    for (auto child = parent.firstChildElement();
         !child.isNull();
         child = child.nextSiblingElement()) {
        if (QXmppJingleRtpHeaderExtensionProperty::isJingleRtpHeaderExtensionProperty(child)) {
            QXmppJingleRtpHeaderExtensionProperty property;
            property.parse(child);
            properties.append(property);
        } else if (child.tagName() == QStringLiteral("extmap-allow-mixed") && child.namespaceURI() == ns_jingle_rtp_header_extensions_negotiation) {
            isRtpHeaderExtensionMixingAllowed = true;
        }
    }
}

// Serializes the RTP header extension properties and isRtpHeaderExtensionMixingAllowed.
static void jingleRtpHeaderExtensionsNegotiationElementsToXml(QXmlStreamWriter *writer, const QVector<QXmppJingleRtpHeaderExtensionProperty> &properties, bool isRtpHeaderExtensionMixingAllowed)
{
    for (const auto &property : properties) {
        property.toXml(writer);
    }

    if (isRtpHeaderExtensionMixingAllowed) {
        writer->writeStartElement(QStringLiteral("extmap-allow-mixed"));
        writer->writeDefaultNamespace(ns_jingle_rtp_header_extensions_negotiation);
        writer->writeEndElement();
    }
}

class QXmppJingleIqContentPrivate : public QSharedData
{
public:
    QXmppJingleIqContentPrivate();

    QString creator;
    QString disposition;
    QString name;
    QString senders;

    QString descriptionMedia;
    quint32 descriptionSsrc;
    QString descriptionType;
    bool isRtpMultiplexingSupported = false;

    QString transportType;
    QString transportUser;
    QString transportPassword;

    QByteArray transportFingerprint;
    QString transportFingerprintHash;
    QString transportFingerprintSetup;

    QList<QXmppJinglePayloadType> payloadTypes;
    QList<QXmppJingleCandidate> transportCandidates;

    // XEP-0167: Jingle RTP Sessions
    std::optional<QXmppJingleRtpEncryption> rtpEncryption;

    // XEP-0293: Jingle RTP Feedback Negotiation
    QVector<QXmppJingleRtpFeedbackProperty> rtpFeedbackProperties;
    QVector<QXmppJingleRtpFeedbackInterval> rtpFeedbackIntervals;

    // XEP-0294: Jingle RTP Header Extensions Negotiation
    QVector<QXmppJingleRtpHeaderExtensionProperty> rtpHeaderExtensionProperties;
    bool isRtpHeaderExtensionMixingAllowed = false;
};

QXmppJingleIqContentPrivate::QXmppJingleIqContentPrivate()
    : descriptionSsrc(0)
{
}

///
/// \enum QXmppJingleIq::Creator
///
/// Party that originially generated the content type
///
/// \since QXmpp 1.5
///

///
/// \struct QXmppJingleIq::RtpSessionStateActive
///
/// Actively participating in the session after having been on mute or having put the other party on
/// hold
///
/// \since QXmpp 1.5
///

///
/// \struct QXmppJingleIq::RtpSessionStateHold
///
/// Temporarily not listening for media from the other party
///
/// \since QXmpp 1.5
///

///
/// \struct QXmppJingleIq::RtpSessionStateUnhold
///
/// Ending hold state
///
/// \since QXmpp 1.5
///

///
/// \struct QXmppJingleIq::RtpSessionStateMuting
///
/// State for muting or unmuting
///
/// \since QXmpp 1.5
///

///
/// \struct QXmppJingleIq::RtpSessionStateRinging
///
/// State after the callee acknowledged the call but did not yet interacted with it
///
/// \since QXmpp 1.5
///

///
/// \typedef QXmppJingleIq::RtpSessionState
///
/// Contains the state of an RTP session as specified by \xep{0167, Jingle RTP Sessions}
/// Informational Messages.
///
/// \since QXmpp 1.5
///

/// Constructs an empty content.
QXmppJingleIq::Content::Content()
    : d(new QXmppJingleIqContentPrivate())
{
}

/// Copy-constructor.
QXmppJingleIq::Content::Content(const QXmppJingleIq::Content &other) = default;
/// Move-constructor.
QXmppJingleIq::Content::Content(QXmppJingleIq::Content &&) = default;
/// Assignment operator.
QXmppJingleIq::Content &QXmppJingleIq::Content::operator=(const QXmppJingleIq::Content &) = default;
/// Move-assignment operator.
QXmppJingleIq::Content &QXmppJingleIq::Content::operator=(QXmppJingleIq::Content &&) = default;

QXmppJingleIq::Content::~Content() = default;

QString QXmppJingleIq::Content::creator() const
{
    return d->creator;
}

void QXmppJingleIq::Content::setCreator(const QString &creator)
{
    d->creator = creator;
}

QString QXmppJingleIq::Content::name() const
{
    return d->name;
}

void QXmppJingleIq::Content::setName(const QString &name)
{
    d->name = name;
}

QString QXmppJingleIq::Content::senders() const
{
    return d->senders;
}

void QXmppJingleIq::Content::setSenders(const QString &senders)
{
    d->senders = senders;
}

QString QXmppJingleIq::Content::descriptionMedia() const
{
    return d->descriptionMedia;
}

void QXmppJingleIq::Content::setDescriptionMedia(const QString &media)
{
    d->descriptionMedia = media;
}

///
/// Returns the description's 32-bit synchronization source for the media stream as specified by
/// \xep{0167, Jingle RTP Sessions} and RFC 3550.
///
/// \since QXmpp 0.9
///
quint32 QXmppJingleIq::Content::descriptionSsrc() const
{
    return d->descriptionSsrc;
}

///
/// Sets the description's 32-bit synchronization source for the media stream as specified by
/// \xep{0167, Jingle RTP Sessions} and RFC 3550.
///
/// \since QXmpp 0.9
///
void QXmppJingleIq::Content::setDescriptionSsrc(quint32 ssrc)
{
    d->descriptionSsrc = ssrc;
}

///
/// Returns whether multiplexing of RTP data and control packets on a single port is supported as
/// specified by \xep{0167, Jingle RTP Sessions} and  RFC 5761.
///
/// \return whether multiplexing of RTP data and control packets is supported
///
/// \since QXmpp 1.5
///
bool QXmppJingleIq::Content::isRtpMultiplexingSupported() const
{
    return d->isRtpMultiplexingSupported;
}

///
/// Sets whether multiplexing of RTP data and control packets on a single port is supported as
/// specified by \xep{0167, Jingle RTP Sessions} and  RFC 5761.
///
/// \param isRtpMultiplexingSupported whether multiplexing of RTP data and control packets is
///        supported
///
/// \since QXmpp 1.5
///
void QXmppJingleIq::Content::setRtpMultiplexingSupported(bool isRtpMultiplexingSupported)
{
    d->isRtpMultiplexingSupported = isRtpMultiplexingSupported;
}

///
/// Returns the encryption used for SRTP negotiation as specified by
/// \xep{0167, Jingle RTP Sessions}.
///
/// \return the RTP encryption via SRTP
///
/// \since QXmpp 1.5
///
std::optional<QXmppJingleRtpEncryption> QXmppJingleIq::Content::rtpEncryption() const
{
    return d->rtpEncryption;
}

///
/// Sets the encryption used for SRTP negotiation as specified by \xep{0167, Jingle RTP Sessions}.
///
/// \param rtpEncryption RTP encryption via SRTP
///
/// \since QXmpp 1.5
///
void QXmppJingleIq::Content::setRtpEncryption(const std::optional<QXmppJingleRtpEncryption> &rtpEncryption)
{
    d->rtpEncryption = rtpEncryption;
}

void QXmppJingleIq::Content::addPayloadType(const QXmppJinglePayloadType &payload)
{
    d->descriptionType = ns_jingle_rtp;
    d->payloadTypes << payload;
}

QList<QXmppJinglePayloadType> QXmppJingleIq::Content::payloadTypes() const
{
    return d->payloadTypes;
}

void QXmppJingleIq::Content::setPayloadTypes(const QList<QXmppJinglePayloadType> &payloadTypes)
{
    d->descriptionType = payloadTypes.isEmpty() ? QString() : ns_jingle_rtp;
    d->payloadTypes = payloadTypes;
}

void QXmppJingleIq::Content::addTransportCandidate(const QXmppJingleCandidate &candidate)
{
    d->transportType = ns_jingle_ice_udp;
    d->transportCandidates << candidate;
}

QList<QXmppJingleCandidate> QXmppJingleIq::Content::transportCandidates() const
{
    return d->transportCandidates;
}

///
/// Sets a list of transport candidates.
///
/// \since QXmpp 0.9.2
///
void QXmppJingleIq::Content::setTransportCandidates(const QList<QXmppJingleCandidate> &candidates)
{
    d->transportType = candidates.isEmpty() ? QString() : ns_jingle_ice_udp;
    d->transportCandidates = candidates;
}

QString QXmppJingleIq::Content::transportUser() const
{
    return d->transportUser;
}

void QXmppJingleIq::Content::setTransportUser(const QString &user)
{
    d->transportUser = user;
}

QString QXmppJingleIq::Content::transportPassword() const
{
    return d->transportPassword;
}

void QXmppJingleIq::Content::setTransportPassword(const QString &password)
{
    d->transportPassword = password;
}

///
/// Returns the properties of RTP feedback.
///
/// \return the RTP feedback properties
///
/// \since QXmpp 1.5
///
QVector<QXmppJingleRtpFeedbackProperty> QXmppJingleIq::Content::rtpFeedbackProperties() const
{
    return d->rtpFeedbackProperties;
}

///
/// Sets the properties of RTP feedback.
///
/// \param rtpFeedbackProperties RTP feedback properties
///
/// \since QXmpp 1.5
///
void QXmppJingleIq::Content::setRtpFeedbackProperties(const QVector<QXmppJingleRtpFeedbackProperty> &rtpFeedbackProperties)
{
    d->rtpFeedbackProperties = rtpFeedbackProperties;
}

///
/// Returns the intervals of RTP feedback.
///
/// \return the RTP feedback intervals
///
/// \since QXmpp 1.5
///
QVector<QXmppJingleRtpFeedbackInterval> QXmppJingleIq::Content::rtpFeedbackIntervals() const
{
    return d->rtpFeedbackIntervals;
}

///
/// Sets the intervals of RTP feedback.
///
/// \param rtpFeedbackIntervals RTP feedback intervals
///
/// \since QXmpp 1.5
///
void QXmppJingleIq::Content::setRtpFeedbackIntervals(const QVector<QXmppJingleRtpFeedbackInterval> &rtpFeedbackIntervals)
{
    d->rtpFeedbackIntervals = rtpFeedbackIntervals;
}

///
/// Returns the RTP header extension properties.
///
/// \return the RTP header extension properties
///
/// \since QXmpp 1.5
///
QVector<QXmppJingleRtpHeaderExtensionProperty> QXmppJingleIq::Content::rtpHeaderExtensionProperties() const
{
    return d->rtpHeaderExtensionProperties;
}

///
/// Sets the RTP header extension properties.
///
/// \param rtpHeaderExtensionProperties RTP header extension properties
///
/// \since QXmpp 1.5
///
void QXmppJingleIq::Content::setRtpHeaderExtensionProperties(const QVector<QXmppJingleRtpHeaderExtensionProperty> &rtpHeaderExtensionProperties)
{
    d->rtpHeaderExtensionProperties = rtpHeaderExtensionProperties;
}

///
/// Returns whether mixing of RTP header extensions is allowed corresponding to the
/// "extmap-allow-mixed" element as specified by
/// \xep{0293, Jingle RTP Header Extensions Negotiation}.
///
/// \return whether mixing of RTP header extensions is allowed
///
/// \since QXmpp 1.5
///
bool QXmppJingleIq::Content::isRtpHeaderExtensionMixingAllowed() const
{
    return d->isRtpHeaderExtensionMixingAllowed;
}

///
/// Sets whether mixing of RTP header extensions is allowed corresponding to the
/// "extmap-allow-mixed" element as specified by
/// \xep{0293, Jingle RTP Header Extensions Negotiation}.
///
/// \param isAllowed whether mixing of RTP header extensions is allowed
///
/// \since QXmpp 1.5
///
void QXmppJingleIq::Content::setRtpHeaderExtensionMixingAllowed(bool isRtpHeaderExtensionMixingAllowed)
{
    d->isRtpHeaderExtensionMixingAllowed = isRtpHeaderExtensionMixingAllowed;
}

///
/// Returns the fingerprint hash value for the transport key.
///
/// This is used for DTLS-SRTP as defined in \xep{0320}.
///
/// \since QXmpp 0.9
///
QByteArray QXmppJingleIq::Content::transportFingerprint() const
{
    return d->transportFingerprint;
}

///
/// Sets the fingerprint hash value for the transport key.
///
/// This is used for DTLS-SRTP as defined in \xep{0320}.
///
/// \since QXmpp 0.9
///
void QXmppJingleIq::Content::setTransportFingerprint(const QByteArray &fingerprint)
{
    d->transportFingerprint = fingerprint;
}

///
/// Returns the fingerprint hash algorithm for the transport key.
///
/// This is used for DTLS-SRTP as defined in \xep{0320}.
///
/// \since QXmpp 0.9
///
QString QXmppJingleIq::Content::transportFingerprintHash() const
{
    return d->transportFingerprintHash;
}

///
/// Sets the fingerprint hash algorithm for the transport key.
///
/// This is used for DTLS-SRTP as defined in \xep{0320}.
///
/// \since QXmpp 0.9
///
void QXmppJingleIq::Content::setTransportFingerprintHash(const QString &hash)
{
    d->transportFingerprintHash = hash;
}

///
/// Returns the setup role for the encrypted transport.
///
/// This is used for DTLS-SRTP as defined in \xep{0320}.
///
/// \since QXmpp 0.9
///
QString QXmppJingleIq::Content::transportFingerprintSetup() const
{
    return d->transportFingerprintSetup;
}

///
/// Sets the setup role for the encrypted transport.
///
/// This is used for DTLS-SRTP as defined in \xep{0320}.
///
/// \since QXmpp 0.9
///
void QXmppJingleIq::Content::setTransportFingerprintSetup(const QString &setup)
{
    d->transportFingerprintSetup = setup;
}

/// \cond
void QXmppJingleIq::Content::parse(const QDomElement &element)
{
    d->creator = element.attribute(QStringLiteral("creator"));
    d->disposition = element.attribute(QStringLiteral("disposition"));
    d->name = element.attribute(QStringLiteral("name"));
    d->senders = element.attribute(QStringLiteral("senders"));

    // description
    QDomElement descriptionElement = element.firstChildElement(QStringLiteral("description"));
    d->descriptionType = descriptionElement.namespaceURI();
    d->descriptionMedia = descriptionElement.attribute(QStringLiteral("media"));
    d->descriptionSsrc = descriptionElement.attribute(QStringLiteral("ssrc")).toULong();
    d->isRtpMultiplexingSupported = !descriptionElement.firstChildElement(QStringLiteral("rtcp-mux")).isNull();

    for (auto childElement = descriptionElement.firstChildElement();
         !childElement.isNull();
         childElement = childElement.nextSiblingElement()) {
        if (QXmppJingleRtpEncryption::isJingleRtpEncryption(childElement)) {
            QXmppJingleRtpEncryption encryption;
            encryption.parse(childElement);
            d->rtpEncryption = encryption;
            break;
        }
    }

    parseJingleRtpFeedbackNegotiationElements(descriptionElement, d->rtpFeedbackProperties, d->rtpFeedbackIntervals);
    parseJingleRtpHeaderExtensionsNegotiationElements(descriptionElement, d->rtpHeaderExtensionProperties, d->isRtpHeaderExtensionMixingAllowed);

    QDomElement child = descriptionElement.firstChildElement(QStringLiteral("payload-type"));
    while (!child.isNull()) {
        QXmppJinglePayloadType payload;
        payload.parse(child);
        d->payloadTypes << payload;
        child = child.nextSiblingElement(QStringLiteral("payload-type"));
    }

    // transport
    QDomElement transportElement = element.firstChildElement(QStringLiteral("transport"));
    d->transportType = transportElement.namespaceURI();
    d->transportUser = transportElement.attribute(QStringLiteral("ufrag"));
    d->transportPassword = transportElement.attribute(QStringLiteral("pwd"));
    child = transportElement.firstChildElement(QStringLiteral("candidate"));
    while (!child.isNull()) {
        QXmppJingleCandidate candidate;
        candidate.parse(child);
        d->transportCandidates << candidate;
        child = child.nextSiblingElement(QStringLiteral("candidate"));
    }

    /// XEP-0320
    child = transportElement.firstChildElement(QStringLiteral("fingerprint"));
    if (!child.isNull()) {
        d->transportFingerprint = parseFingerprint(child.text());
        d->transportFingerprintHash = child.attribute(QStringLiteral("hash"));
        d->transportFingerprintSetup = child.attribute(QStringLiteral("setup"));
    }
}

void QXmppJingleIq::Content::toXml(QXmlStreamWriter *writer) const
{
    if (d->creator.isEmpty() || d->name.isEmpty()) {
        return;
    }

    writer->writeStartElement(QStringLiteral("content"));
    helperToXmlAddAttribute(writer, QStringLiteral("creator"), d->creator);
    helperToXmlAddAttribute(writer, QStringLiteral("disposition"), d->disposition);
    helperToXmlAddAttribute(writer, QStringLiteral("name"), d->name);
    helperToXmlAddAttribute(writer, QStringLiteral("senders"), d->senders);

    // description
    if (!d->descriptionType.isEmpty() || !d->payloadTypes.isEmpty()) {
        writer->writeStartElement(QStringLiteral("description"));
        writer->writeDefaultNamespace(d->descriptionType);
        helperToXmlAddAttribute(writer, QStringLiteral("media"), d->descriptionMedia);

        if (d->descriptionSsrc) {
            writer->writeAttribute(QStringLiteral("ssrc"), QString::number(d->descriptionSsrc));
        }

        if (d->isRtpMultiplexingSupported) {
            writer->writeEmptyElement(QStringLiteral("rtcp-mux"));
        }

        if (d->rtpEncryption) {
            d->rtpEncryption->toXml(writer);
        }

        jingleRtpFeedbackNegotiationElementsToXml(writer, d->rtpFeedbackProperties, d->rtpFeedbackIntervals);
        jingleRtpHeaderExtensionsNegotiationElementsToXml(writer, d->rtpHeaderExtensionProperties, d->isRtpHeaderExtensionMixingAllowed);

        for (const auto &payload : d->payloadTypes) {
            payload.toXml(writer);
        }

        writer->writeEndElement();
    }

    // transport
    if (!d->transportType.isEmpty() || !d->transportCandidates.isEmpty()) {
        writer->writeStartElement(QStringLiteral("transport"));
        writer->writeDefaultNamespace(d->transportType);
        helperToXmlAddAttribute(writer, QStringLiteral("ufrag"), d->transportUser);
        helperToXmlAddAttribute(writer, QStringLiteral("pwd"), d->transportPassword);
        for (const auto &candidate : d->transportCandidates) {
            candidate.toXml(writer);
        }

        // XEP-0320: Use of DTLS-SRTP in Jingle Sessions
        if (!d->transportFingerprint.isEmpty() && !d->transportFingerprintHash.isEmpty()) {
            writer->writeStartElement(QStringLiteral("fingerprint"));
            writer->writeDefaultNamespace(ns_jingle_dtls);
            writer->writeAttribute(QStringLiteral("hash"), d->transportFingerprintHash);
            writer->writeAttribute(QStringLiteral("setup"), d->transportFingerprintSetup);
            writer->writeCharacters(formatFingerprint(d->transportFingerprint));
            writer->writeEndElement();
        }
        writer->writeEndElement();
    }

    writer->writeEndElement();
}

bool QXmppJingleIq::Content::parseSdp(const QString &sdp)
{
    QList<QXmppJinglePayloadType> payloads;
    for (auto &line : sdp.split(QChar(u'\n'))) {
        if (line.endsWith('\r')) {
            line.resize(line.size() - 1);
        }
        if (line.startsWith(QStringLiteral("a="))) {
            int idx = line.indexOf(':');
            const QString attrName = idx != -1 ? line.mid(2, idx - 2) : line.mid(2);
            const QString attrValue = idx != -1 ? line.mid(idx + 1) : "";

            if (attrName == QStringLiteral("candidate")) {
                QXmppJingleCandidate candidate;
                if (!candidateParseSdp(&candidate, line.mid(2))) {
                    qWarning() << "Could not parse candidate" << line;
                    return false;
                }
                addTransportCandidate(candidate);
            } else if (attrName == QStringLiteral("fingerprint")) {
                const QStringList bits = attrValue.split(' ');
                if (bits.size() > 1) {
                    d->transportFingerprintHash = bits[0];
                    d->transportFingerprint = parseFingerprint(bits[1]);
                }
            } else if (attrName == QStringLiteral("fmtp")) {
                int spIdx = attrValue.indexOf(' ');
                if (spIdx == -1) {
                    qWarning() << "Could not parse payload parameters" << line;
                    return false;
                }
                const int id = attrValue.left(spIdx).toInt();
                const QString paramStr = attrValue.mid(spIdx + 1);
                for (auto &payload : payloads) {
                    if (payload.id() == id) {
                        QMap<QString, QString> params;
                        if (payload.name() == QStringLiteral("telephone-event")) {
                            params.insert(QStringLiteral("events"), paramStr);
                        } else {
                            thread_local static const auto regex = QRegularExpression(";\\s*");
                            const auto paramParts = paramStr.split(regex);
                            for (const auto &p : paramParts) {
                                const QStringList bits = p.split('=');
                                if (bits.size() == 2) {
                                    params.insert(bits.at(0), bits.at(1));
                                }
                            }
                        }
                        payload.setParameters(params);
                    }
                }
            } else if (attrName == QStringLiteral("rtpmap")) {
                // payload type map
                const QStringList bits = attrValue.split(' ');
                if (bits.size() != 2) {
                    continue;
                }
                bool ok = false;
                const int id = bits[0].toInt(&ok);
                if (!ok) {
                    continue;
                }

                const QStringList args = bits[1].split('/');
                for (auto &payload : payloads) {
                    if (payload.id() == id) {
                        payload.setName(args[0]);
                        if (args.size() > 1) {
                            payload.setClockrate(args[1].toInt());
                        }
                        if (args.size() > 2) {
                            payload.setChannels(args[2].toInt());
                        }
                    }
                }
            } else if (attrName == QStringLiteral("ice-ufrag")) {
                d->transportUser = attrValue;
            } else if (attrName == QStringLiteral("ice-pwd")) {
                d->transportPassword = attrValue;
            } else if (attrName == QStringLiteral("setup")) {
                d->transportFingerprintSetup = attrValue;
            } else if (attrName == QStringLiteral("ssrc")) {
                const QStringList bits = attrValue.split(' ');
                if (bits.isEmpty()) {
                    qWarning() << "Could not parse ssrc" << line;
                    return false;
                }
                d->descriptionSsrc = bits[0].toULong();
            }
        } else if (line.startsWith(QStringLiteral("m="))) {
            // FIXME: what do we do with the profile (bits[2]) ?
            QStringList bits = line.mid(2).split(' ');
            if (bits.size() < 3) {
                qWarning() << "Could not parse media" << line;
                return false;
            }
            d->descriptionMedia = bits[0];

            // parse payload types
            for (int i = 3; i < bits.size(); ++i) {
                bool ok = false;
                int id = bits[i].toInt(&ok);
                if (!ok) {
                    continue;
                }
                QXmppJinglePayloadType payload;
                payload.setId(id);
                payloads << payload;
            }
        }
    }
    setPayloadTypes(payloads);
    return true;
}

static bool candidateLessThan(const QXmppJingleCandidate &c1, const QXmppJingleCandidate &c2)
{
    if (c1.type() == c2.type()) {
        return c1.priority() > c2.priority();
    } else {
        return c1.type() == QXmppJingleCandidate::ServerReflexiveType;
    }
}

QString QXmppJingleIq::Content::toSdp() const
{
    // get default candidate
    QHostAddress localRtpAddress = QHostAddress::Any;
    quint16 localRtpPort = 0;
    QList<QXmppJingleCandidate> sortedCandidates = d->transportCandidates;
    std::sort(sortedCandidates.begin(), sortedCandidates.end(), candidateLessThan);
    for (const auto &candidate : sortedCandidates) {
        if (candidate.component() == RTP_COMPONENT) {
            localRtpAddress = candidate.host();
            localRtpPort = candidate.port();
            break;
        }
    }

    QStringList sdp;

    // media
    QString payloads;
    QStringList attrs;
    for (const QXmppJinglePayloadType &payload : d->payloadTypes) {
        payloads += " " + QString::number(payload.id());
        QString rtpmap = QString::number(payload.id()) + " " + payload.name() + "/" + QString::number(payload.clockrate());
        if (payload.channels() > 1) {
            rtpmap += "/" + QString::number(payload.channels());
        }
        attrs << "a=rtpmap:" + rtpmap;

        // payload parameters
        QStringList paramList;
        const QMap<QString, QString> params = payload.parameters();
        if (payload.name() == QStringLiteral("telephone-event")) {
            if (params.contains(QStringLiteral("events"))) {
                paramList << params.value(QStringLiteral("events"));
            }
        } else {
            QMap<QString, QString>::const_iterator i;
            for (i = params.begin(); i != params.end(); ++i) {
                paramList << i.key() + QStringLiteral("=") + i.value();
            }
        }
        if (!paramList.isEmpty()) {
            attrs << QStringLiteral("a=fmtp:") + QByteArray::number(payload.id()) + QStringLiteral(" ") + paramList.join("; ");
        }
    }
    sdp << QStringLiteral("m=%1 %2 RTP/AVP%3").arg(d->descriptionMedia, QString::number(localRtpPort), payloads);
    sdp << QStringLiteral("c=%1").arg(addressToSdp(localRtpAddress));
    sdp += attrs;

    // transport
    for (const auto &candidate : d->transportCandidates) {
        sdp << QStringLiteral("a=%1").arg(candidateToSdp(candidate));
    }
    if (!d->transportUser.isEmpty()) {
        sdp << QStringLiteral("a=ice-ufrag:%1").arg(d->transportUser);
    }
    if (!d->transportPassword.isEmpty()) {
        sdp << QStringLiteral("a=ice-pwd:%1").arg(d->transportPassword);
    }
    if (!d->transportFingerprint.isEmpty() && !d->transportFingerprintHash.isEmpty()) {
        sdp << QStringLiteral("a=fingerprint:%1 %2").arg(d->transportFingerprintHash, formatFingerprint(d->transportFingerprint));
    }
    if (!d->transportFingerprintSetup.isEmpty()) {
        sdp << QStringLiteral("a=setup:%1").arg(d->transportFingerprintSetup);
    }

    return sdp.join("\r\n") + "\r\n";
}

/// \endcond

///
/// \enum QXmppJingleIq::Reason::RtpErrorCondition
///
/// Condition of an RTP-specific error
///
/// \since QXmpp 1.5
///

QXmppJingleIq::Reason::Reason()
    : m_type(None)
{
}

/// Returns the reason's textual description.

QString QXmppJingleIq::Reason::text() const
{
    return m_text;
}

/// Sets the reason's textual description.

void QXmppJingleIq::Reason::setText(const QString &text)
{
    m_text = text;
}

/// Gets the reason's type.

QXmppJingleIq::Reason::Type QXmppJingleIq::Reason::type() const
{
    return m_type;
}

/// Sets the reason's type.

void QXmppJingleIq::Reason::setType(QXmppJingleIq::Reason::Type type)
{
    m_type = type;
}

///
/// Returns the RTP error condition as specified by \xep{0167, Jingle RTP Sessions}.
///
/// \return the RTP error condition
///
/// \since QXmpp 1.5
///
QXmppJingleIq::Reason::RtpErrorCondition QXmppJingleIq::Reason::rtpErrorCondition() const
{
    return m_rtpErrorCondition;
}

///
/// Sets the RTP error condition as specified by \xep{0167, Jingle RTP Sessions}.
///
/// \param rtpErrorCondition RTP error condition
///
/// \since QXmpp 1.5
///
void QXmppJingleIq::Reason::setRtpErrorCondition(RtpErrorCondition rtpErrorCondition)
{
    m_rtpErrorCondition = rtpErrorCondition;
}

/// \cond
void QXmppJingleIq::Reason::parse(const QDomElement &element)
{
    m_text = element.firstChildElement(QStringLiteral("text")).text();
    for (int i = AlternativeSession; i <= UnsupportedTransports; i++) {
        if (!element.firstChildElement(jingle_reasons[i]).isNull()) {
            m_type = static_cast<Type>(i);
            break;
        }
    }

    for (auto child = element.firstChildElement();
         !child.isNull();
         child = child.nextSiblingElement()) {
        if (child.namespaceURI() == ns_jingle_rtp_errors) {
            if (const auto index = JINGLE_RTP_ERROR_CONDITIONS.indexOf(child.tagName());
                index != -1) {
                m_rtpErrorCondition = RtpErrorCondition(index);
            }
            break;
        }
    }
}

void QXmppJingleIq::Reason::toXml(QXmlStreamWriter *writer) const
{
    if (m_type < AlternativeSession || m_type > UnsupportedTransports) {
        return;
    }

    writer->writeStartElement(QStringLiteral("reason"));
    if (!m_text.isEmpty()) {
        helperToXmlAddTextElement(writer, QStringLiteral("text"), m_text);
    }
    writer->writeEmptyElement(jingle_reasons[m_type]);

    if (m_rtpErrorCondition != NoErrorCondition) {
        writer->writeStartElement(JINGLE_RTP_ERROR_CONDITIONS.at(m_rtpErrorCondition));
        writer->writeDefaultNamespace(ns_jingle_rtp_errors);
        writer->writeEndElement();
    }

    writer->writeEndElement();
}
/// \endcond

class QXmppJingleIqPrivate : public QSharedData
{
public:
    QXmppJingleIqPrivate();

    QXmppJingleIq::Action action;
    QString initiator;
    QString responder;
    QString sid;

    QString mujiGroupChatJid;

    QList<QXmppJingleIq::Content> contents;
    QXmppJingleIq::Reason reason;

    std::optional<QXmppJingleIq::RtpSessionState> rtpSessionState;
};

QXmppJingleIqPrivate::QXmppJingleIqPrivate()
    : action(QXmppJingleIq::ContentAccept)
{
}

/// Constructs a QXmppJingleIq.
QXmppJingleIq::QXmppJingleIq()
    : d(new QXmppJingleIqPrivate())
{
}

/// Copy-constructor.
QXmppJingleIq::QXmppJingleIq(const QXmppJingleIq &) = default;
/// Move-constructor.
QXmppJingleIq::QXmppJingleIq(QXmppJingleIq &&) = default;

QXmppJingleIq::~QXmppJingleIq() = default;

/// Assignment operator.
QXmppJingleIq &QXmppJingleIq::operator=(const QXmppJingleIq &) = default;
/// Move-assignment operator.
QXmppJingleIq &QXmppJingleIq::operator=(QXmppJingleIq &&) = default;

///
/// Returns the Jingle IQ's action.
///
QXmppJingleIq::Action QXmppJingleIq::action() const
{
    return d->action;
}

/// Sets the Jingle IQ's action.
///
/// \param action

void QXmppJingleIq::setAction(QXmppJingleIq::Action action)
{
    d->action = action;
}

///
/// Adds an element to the IQ's content elements.
///
/// \since QXmpp 0.9.2
///
void QXmppJingleIq::addContent(const QXmppJingleIq::Content &content)
{
    d->contents << content;
}

///
/// Returns the IQ's content elements.
///
/// \since QXmpp 0.9.2
///
QList<QXmppJingleIq::Content> QXmppJingleIq::contents() const
{
    return d->contents;
}

///
/// Sets the IQ's content elements.
///
/// \since QXmpp 0.9.2
///
void QXmppJingleIq::setContents(const QList<QXmppJingleIq::Content> &contents)
{
    d->contents = contents;
}

/// Returns the session initiator.

QString QXmppJingleIq::initiator() const
{
    return d->initiator;
}

/// Sets the session initiator.
///
/// \param initiator

void QXmppJingleIq::setInitiator(const QString &initiator)
{
    d->initiator = initiator;
}

/// Returns a reference to the IQ's reason element.

QXmppJingleIq::Reason &QXmppJingleIq::reason()
{
    return d->reason;
}

/// Returns a const reference to the IQ's reason element.

const QXmppJingleIq::Reason &QXmppJingleIq::reason() const
{
    return d->reason;
}

/// Returns the session responder.

QString QXmppJingleIq::responder() const
{
    return d->responder;
}

/// Sets the session responder.
///
/// \param responder

void QXmppJingleIq::setResponder(const QString &responder)
{
    d->responder = responder;
}

///
/// Returns true if the call is ringing.
///
/// \deprecated This method is deprecated since QXmpp 1.5. Use \c QXmppJingleIq::rtpSessionState()
/// instead.
///
bool QXmppJingleIq::ringing() const
{
    if (d->rtpSessionState) {
        return std::holds_alternative<RtpSessionStateRinging>(*d->rtpSessionState);
    }

    return false;
}

///
/// Set to true if the call is ringing.
///
/// \param ringing
///
/// \deprecated This method is deprecated since QXmpp 1.5. Use
/// \c QXmppJingleIq::setRtpSessionState() instead.
///
void QXmppJingleIq::setRinging(bool ringing)
{
    if (ringing) {
        d->rtpSessionState = RtpSessionStateRinging();
    } else {
        d->rtpSessionState = std::nullopt;
    }
}

/// Returns the session ID.
QString QXmppJingleIq::sid() const
{
    return d->sid;
}

/// Sets the session ID.
///
/// \param sid

void QXmppJingleIq::setSid(const QString &sid)
{
    d->sid = sid;
}

///
/// Returns the JID of the \xep{0272, Multiparty Jingle (Muji)} group chat.
///
/// \return the Muji group chat JID
///
/// \since QXmpp 1.5
///
QString QXmppJingleIq::mujiGroupChatJid() const
{
    return d->mujiGroupChatJid;
}

///
/// Sets the JID of the \xep{0272, Multiparty Jingle (Muji)} group chat.
///
/// \param mujiGroupChatJid Muji group chat JID
///
/// \since QXmpp 1.5
///
void QXmppJingleIq::setMujiGroupChatJid(const QString &mujiGroupChatJid)
{
    d->mujiGroupChatJid = mujiGroupChatJid;
}

///
/// Returns the state of an RTP session as specified by \xep{0167, Jingle RTP Sessions}
/// Informational Messages.
///
/// \return the session's state
///
/// \since QXmpp 1.5
///
std::optional<QXmppJingleIq::RtpSessionState> QXmppJingleIq::rtpSessionState() const
{
    return d->rtpSessionState;
}

///
/// Sets the state of an RTP session as specified by \xep{0167, Jingle RTP Sessions} Informational
/// Messages.
///
/// The appropriate action is set as well.
/// Thus, it is not needed to set it manually.
///
/// \param rtpSessionState session's state
///
/// \since QXmpp 1.5
///
void QXmppJingleIq::setRtpSessionState(const std::optional<RtpSessionState> &rtpSessionState)
{
    d->rtpSessionState = rtpSessionState;
    d->action = Action::SessionInfo;
}

/// \cond
bool QXmppJingleIq::isJingleIq(const QDomElement &element)
{
    QDomElement jingleElement = element.firstChildElement(QStringLiteral("jingle"));
    return (jingleElement.namespaceURI() == ns_jingle);
}

void QXmppJingleIq::parseElementFromChild(const QDomElement &element)
{
    QDomElement jingleElement = element.firstChildElement(QStringLiteral("jingle"));
    const QString action = jingleElement.attribute(QStringLiteral("action"));
    for (int i = ContentAccept; i <= TransportReplace; i++) {
        if (action == jingle_actions[i]) {
            d->action = static_cast<Action>(i);
            break;
        }
    }
    d->initiator = jingleElement.attribute(QStringLiteral("initiator"));
    d->responder = jingleElement.attribute(QStringLiteral("responder"));
    d->sid = jingleElement.attribute(QStringLiteral("sid"));

    // XEP-0272: Multiparty Jingle (Muji)
    if (const auto mujiGroupChatElement = jingleElement.firstChildElement(QStringLiteral("muji"));
        mujiGroupChatElement.namespaceURI() == ns_muji) {
        d->mujiGroupChatJid = mujiGroupChatElement.attribute(QStringLiteral("room"));
    }

    // content
    d->contents.clear();
    QDomElement contentElement = jingleElement.firstChildElement(QStringLiteral("content"));
    while (!contentElement.isNull()) {
        Content content;
        content.parse(contentElement);
        addContent(content);
        contentElement = contentElement.nextSiblingElement(QStringLiteral("content"));
    }
    QDomElement reasonElement = jingleElement.firstChildElement(QStringLiteral("reason"));
    d->reason.parse(reasonElement);

    for (auto childElement = jingleElement.firstChildElement();
         !childElement.isNull();
         childElement = childElement.nextSiblingElement()) {
        if (childElement.namespaceURI() == ns_jingle_rtp_info) {
            const auto elementTag = childElement.tagName();

            if (elementTag == QStringLiteral("active")) {
                d->rtpSessionState = RtpSessionStateActive();
            } else if (elementTag == QStringLiteral("hold")) {
                d->rtpSessionState = RtpSessionStateHold();
            } else if (elementTag == QStringLiteral("unhold")) {
                d->rtpSessionState = RtpSessionStateUnhold();
            } else if (const auto isMute = elementTag == QStringLiteral("mute"); isMute || elementTag == QStringLiteral("unmute")) {
                RtpSessionStateMuting muting;
                muting.isMute = isMute;

                if (const auto creator = childElement.attribute(QStringLiteral("creator")); creator == QStringLiteral("initiator")) {
                    muting.creator = Initiator;
                } else if (creator == QStringLiteral("responder")) {
                    muting.creator = Responder;
                }

                muting.name = childElement.attribute(QStringLiteral("name"));

                d->rtpSessionState = muting;
            } else if (elementTag == QStringLiteral("ringing")) {
                d->rtpSessionState = RtpSessionStateRinging();
            }
        }
    }
}

void QXmppJingleIq::toXmlElementFromChild(QXmlStreamWriter *writer) const
{
    writer->writeStartElement(QStringLiteral("jingle"));
    writer->writeDefaultNamespace(ns_jingle);
    helperToXmlAddAttribute(writer, QStringLiteral("action"), jingle_actions[d->action]);
    helperToXmlAddAttribute(writer, QStringLiteral("initiator"), d->initiator);
    helperToXmlAddAttribute(writer, QStringLiteral("responder"), d->responder);
    helperToXmlAddAttribute(writer, QStringLiteral("sid"), d->sid);

    // XEP-0272: Multiparty Jingle (Muji)
    if (!d->mujiGroupChatJid.isEmpty()) {
        writer->writeStartElement(QStringLiteral("muji"));
        writer->writeDefaultNamespace(ns_muji);
        helperToXmlAddAttribute(writer, QStringLiteral("room"), d->mujiGroupChatJid);
        writer->writeEndElement();
    }

    for (const auto &content : d->contents) {
        content.toXml(writer);
    }

    d->reason.toXml(writer);

    const auto writeStartElementWithNamespace = [=](const QString &tagName) {
        writer->writeStartElement(tagName);
        writer->writeDefaultNamespace(ns_jingle_rtp_info);
    };

    if (d->rtpSessionState) {
        if (std::holds_alternative<RtpSessionStateActive>(*d->rtpSessionState)) {
            writeStartElementWithNamespace(QStringLiteral("active"));
        } else if (std::holds_alternative<RtpSessionStateHold>(*d->rtpSessionState)) {
            writeStartElementWithNamespace(QStringLiteral("hold"));
        } else if (std::holds_alternative<RtpSessionStateUnhold>(*d->rtpSessionState)) {
            writeStartElementWithNamespace(QStringLiteral("unhold"));
        } else if (auto rtpSessionStateMuting = std::get_if<RtpSessionStateMuting>(&(*d->rtpSessionState))) {
            if (rtpSessionStateMuting->isMute) {
                writeStartElementWithNamespace(QStringLiteral("mute"));
            } else {
                writeStartElementWithNamespace(QStringLiteral("unmute"));
            }

            if (rtpSessionStateMuting->creator == Initiator) {
                helperToXmlAddAttribute(writer, QStringLiteral("creator"), QStringLiteral("initiator"));
            } else if (rtpSessionStateMuting->creator == Responder) {
                helperToXmlAddAttribute(writer, QStringLiteral("creator"), QStringLiteral("responder"));
            }

            helperToXmlAddAttribute(writer, QStringLiteral("name"), rtpSessionStateMuting->name);
        } else {
            writeStartElementWithNamespace(QStringLiteral("ringing"));
        }

        writer->writeEndElement();
    }

    writer->writeEndElement();
}
/// \endcond

class QXmppJingleCandidatePrivate : public QSharedData
{
public:
    QXmppJingleCandidatePrivate();

    int component;
    QString foundation;
    int generation;
    QHostAddress host;
    QString id;
    int network;
    quint16 port;
    QString protocol;
    int priority;
    QXmppJingleCandidate::Type type;
};

QXmppJingleCandidatePrivate::QXmppJingleCandidatePrivate()
    : component(0), generation(0), network(0), port(0), priority(0), type(QXmppJingleCandidate::HostType)
{
}

///
/// Constructs an empty candidate.
///
QXmppJingleCandidate::QXmppJingleCandidate()
    : d(new QXmppJingleCandidatePrivate())
{
}

/// Copy-constructor.
QXmppJingleCandidate::QXmppJingleCandidate(const QXmppJingleCandidate &other) = default;
/// Move-constructor.
QXmppJingleCandidate::QXmppJingleCandidate(QXmppJingleCandidate &&) = default;
QXmppJingleCandidate::~QXmppJingleCandidate() = default;
/// Assignment operator.
QXmppJingleCandidate &QXmppJingleCandidate::operator=(const QXmppJingleCandidate &other) = default;
/// Move-assignment operator.
QXmppJingleCandidate &QXmppJingleCandidate::operator=(QXmppJingleCandidate &&) = default;

/// Returns the candidate's component ID.

int QXmppJingleCandidate::component() const
{
    return d->component;
}

/// Sets the candidates's component ID.
///
/// \param component

void QXmppJingleCandidate::setComponent(int component)
{
    d->component = component;
}

///
/// Returns the candidate's foundation.
///
/// \since QXmpp 0.9
///
QString QXmppJingleCandidate::foundation() const
{
    return d->foundation;
}

///
/// Sets the candidate's foundation.
///
/// \param foundation
///
/// \since QXmpp 0.9
///
void QXmppJingleCandidate::setFoundation(const QString &foundation)
{
    d->foundation = foundation;
}

///
/// Returns the candidate's generation.
///
/// \since QXmpp 0.9
///
int QXmppJingleCandidate::generation() const
{
    return d->generation;
}

///
/// Sets the candidate's generation.
///
/// \param generation
///
/// \since QXmpp 0.9
///
void QXmppJingleCandidate::setGeneration(int generation)
{
    d->generation = generation;
}

/// Returns the candidate's host address.
///

QHostAddress QXmppJingleCandidate::host() const
{
    return d->host;
}

/// Sets the candidate's host address.
///
/// \param host

void QXmppJingleCandidate::setHost(const QHostAddress &host)
{
    d->host = host;
}

/// Returns the candidate's unique identifier.
///

QString QXmppJingleCandidate::id() const
{
    return d->id;
}

/// Sets the candidate's unique identifier.
///
/// \param id

void QXmppJingleCandidate::setId(const QString &id)
{
    d->id = id;
}

/// Returns the network index (starting at 0) the candidate is on.
///

int QXmppJingleCandidate::network() const
{
    return d->network;
}

/// Sets the network index (starting at 0) the candidate is on.
///
/// \param network

void QXmppJingleCandidate::setNetwork(int network)
{
    d->network = network;
}

/// Returns the candidate's port number.
///

quint16 QXmppJingleCandidate::port() const
{
    return d->port;
}

/// Sets the candidate's port number.
///
/// \param port

void QXmppJingleCandidate::setPort(quint16 port)
{
    d->port = port;
}

/// Returns the candidate's priority.
///

int QXmppJingleCandidate::priority() const
{
    return d->priority;
}

/// Sets the candidate's priority.
///
/// \param priority

void QXmppJingleCandidate::setPriority(int priority)
{
    d->priority = priority;
}

/// Returns the candidate's protocol (e.g. "udp").
///

QString QXmppJingleCandidate::protocol() const
{
    return d->protocol;
}

/// Sets the candidate's protocol (e.g. "udp").
///
/// \param protocol

void QXmppJingleCandidate::setProtocol(const QString &protocol)
{
    d->protocol = protocol;
}

/// Returns the candidate type (e.g. "host").
///

QXmppJingleCandidate::Type QXmppJingleCandidate::type() const
{
    return d->type;
}

/// Sets the candidate type (e.g. "host").
///
/// \param type

void QXmppJingleCandidate::setType(QXmppJingleCandidate::Type type)
{
    d->type = type;
}

/// Returns true if the host address or port are empty.
///

bool QXmppJingleCandidate::isNull() const
{
    return d->host.isNull() || !d->port;
}

/// \cond
void QXmppJingleCandidate::parse(const QDomElement &element)
{
    d->component = element.attribute(QStringLiteral("component")).toInt();
    d->foundation = element.attribute(QStringLiteral("foundation"));
    d->generation = element.attribute(QStringLiteral("generation")).toInt();
    d->host = QHostAddress(element.attribute(QStringLiteral("ip")));
    d->id = element.attribute(QStringLiteral("id"));
    d->network = element.attribute(QStringLiteral("network")).toInt();
    d->port = element.attribute(QStringLiteral("port")).toInt();
    d->priority = element.attribute(QStringLiteral("priority")).toInt();
    d->protocol = element.attribute(QStringLiteral("protocol"));
    d->type = typeFromString(element.attribute(QStringLiteral("type")));
}

void QXmppJingleCandidate::toXml(QXmlStreamWriter *writer) const
{
    writer->writeStartElement(QStringLiteral("candidate"));
    helperToXmlAddAttribute(writer, QStringLiteral("component"), QString::number(d->component));
    helperToXmlAddAttribute(writer, QStringLiteral("foundation"), d->foundation);
    helperToXmlAddAttribute(writer, QStringLiteral("generation"), QString::number(d->generation));
    helperToXmlAddAttribute(writer, QStringLiteral("id"), d->id);
    helperToXmlAddAttribute(writer, QStringLiteral("ip"), d->host.toString());
    helperToXmlAddAttribute(writer, QStringLiteral("network"), QString::number(d->network));
    helperToXmlAddAttribute(writer, QStringLiteral("port"), QString::number(d->port));
    helperToXmlAddAttribute(writer, QStringLiteral("priority"), QString::number(d->priority));
    helperToXmlAddAttribute(writer, QStringLiteral("protocol"), d->protocol);
    helperToXmlAddAttribute(writer, QStringLiteral("type"), typeToString(d->type));
    writer->writeEndElement();
}

QXmppJingleCandidate::Type QXmppJingleCandidate::typeFromString(const QString &typeStr, bool *ok)
{
    QXmppJingleCandidate::Type type;
    if (typeStr == QStringLiteral("host")) {
        type = HostType;
    } else if (typeStr == QStringLiteral("prflx")) {
        type = PeerReflexiveType;
    } else if (typeStr == QStringLiteral("srflx")) {
        type = ServerReflexiveType;
    } else if (typeStr == QStringLiteral("relay")) {
        type = RelayedType;
    } else {
        qWarning() << "Unknown candidate type" << typeStr;
        if (ok) {
            *ok = false;
        }
        return HostType;
    }
    if (ok) {
        *ok = true;
    }
    return type;
}

QString QXmppJingleCandidate::typeToString(QXmppJingleCandidate::Type type)
{
    QString typeStr;
    switch (type) {
    case HostType:
        typeStr = QStringLiteral("host");
        break;
    case PeerReflexiveType:
        typeStr = QStringLiteral("prflx");
        break;
    case ServerReflexiveType:
        typeStr = QStringLiteral("srflx");
        break;
    case RelayedType:
        typeStr = QStringLiteral("relay");
        break;
    }
    return typeStr;
}
/// \endcond

class QXmppJinglePayloadTypePrivate : public QSharedData
{
public:
    QXmppJinglePayloadTypePrivate();

    unsigned char channels;
    unsigned int clockrate;
    unsigned char id;
    unsigned int maxptime;
    QString name;
    QMap<QString, QString> parameters;
    unsigned int ptime;

    // XEP-0293: Jingle RTP Feedback Negotiation
    QVector<QXmppJingleRtpFeedbackProperty> rtpFeedbackProperties;
    QVector<QXmppJingleRtpFeedbackInterval> rtpFeedbackIntervals;
};

QXmppJinglePayloadTypePrivate::QXmppJinglePayloadTypePrivate()
    : channels(1), clockrate(0), id(0), maxptime(0), ptime(0)
{
}

QXmppJinglePayloadType::QXmppJinglePayloadType()
    : d(new QXmppJinglePayloadTypePrivate())
{
}

/// Constructs a copy of other.
///
/// \param other

QXmppJinglePayloadType::QXmppJinglePayloadType(const QXmppJinglePayloadType &other)
    : d(other.d)
{
}

QXmppJinglePayloadType::~QXmppJinglePayloadType()
{
}

/// Returns the number of channels (e.g. 1 for mono, 2 for stereo).
///

unsigned char QXmppJinglePayloadType::channels() const
{
    return d->channels;
}

/// Sets the number of channels (e.g. 1 for mono, 2 for stereo).
///
/// \param channels

void QXmppJinglePayloadType::setChannels(unsigned char channels)
{
    d->channels = channels;
}

/// Returns the clockrate in Hz, i.e. the number of samples per second.
///

unsigned int QXmppJinglePayloadType::clockrate() const
{
    return d->clockrate;
}

/// Sets the clockrate in Hz, i.e. the number of samples per second.
///
/// \param clockrate

void QXmppJinglePayloadType::setClockrate(unsigned int clockrate)
{
    d->clockrate = clockrate;
}

/// Returns the payload type identifier.
///

unsigned char QXmppJinglePayloadType::id() const
{
    return d->id;
}

/// Sets the payload type identifier.
///

void QXmppJinglePayloadType::setId(unsigned char id)
{
    Q_ASSERT(id <= 127);
    d->id = id;
}

/// Returns the maximum packet time in milliseconds.
///

unsigned int QXmppJinglePayloadType::maxptime() const
{
    return d->maxptime;
}

/// Sets the maximum packet type in milliseconds.
///
/// \param maxptime

void QXmppJinglePayloadType::setMaxptime(unsigned int maxptime)
{
    d->maxptime = maxptime;
}

/// Returns the payload type name.
///

QString QXmppJinglePayloadType::name() const
{
    return d->name;
}

/// Sets the payload type name.
///
/// \param name

void QXmppJinglePayloadType::setName(const QString &name)
{
    d->name = name;
}

/// Returns the payload parameters.

QMap<QString, QString> QXmppJinglePayloadType::parameters() const
{
    return d->parameters;
}

/// Sets the payload parameters.

void QXmppJinglePayloadType::setParameters(const QMap<QString, QString> &parameters)
{
    d->parameters = parameters;
}

/// Returns the packet time in milliseconds (20 by default).
///

unsigned int QXmppJinglePayloadType::ptime() const
{
    return d->ptime ? d->ptime : 20;
}

/// Sets the packet time in milliseconds (20 by default).
///
/// \param ptime

void QXmppJinglePayloadType::setPtime(unsigned int ptime)
{
    d->ptime = ptime;
}

///
/// Returns the properties of RTP feedback.
///
/// \return the RTP feedback properties
///
/// \since QXmpp 1.5
///
QVector<QXmppJingleRtpFeedbackProperty> QXmppJinglePayloadType::rtpFeedbackProperties() const
{
    return d->rtpFeedbackProperties;
}

///
/// Sets the properties of RTP feedback.
///
/// \param rtpFeedbackProperties RTP feedback properties
///
/// \since QXmpp 1.5
///
void QXmppJinglePayloadType::setRtpFeedbackProperties(const QVector<QXmppJingleRtpFeedbackProperty> &rtpFeedbackProperties)
{
    d->rtpFeedbackProperties = rtpFeedbackProperties;
}

///
/// Returns the intervals of RTP feedback.
///
/// \return the RTP feedback intervals
///
QVector<QXmppJingleRtpFeedbackInterval> QXmppJinglePayloadType::rtpFeedbackIntervals() const
{
    return d->rtpFeedbackIntervals;
}

///
/// Sets the intervals of RTP feedback.
///
/// \param rtpFeedbackIntervals RTP feedback intervals
///
void QXmppJinglePayloadType::setRtpFeedbackIntervals(const QVector<QXmppJingleRtpFeedbackInterval> &rtpFeedbackIntervals)
{
    d->rtpFeedbackIntervals = rtpFeedbackIntervals;
}

/// \cond
void QXmppJinglePayloadType::parse(const QDomElement &element)
{
    d->id = element.attribute(QStringLiteral("id")).toInt();
    d->name = element.attribute(QStringLiteral("name"));
    d->channels = element.attribute(QStringLiteral("channels")).toInt();
    if (!d->channels) {
        d->channels = 1;
    }
    d->clockrate = element.attribute(QStringLiteral("clockrate")).toInt();
    d->maxptime = element.attribute(QStringLiteral("maxptime")).toInt();
    d->ptime = element.attribute(QStringLiteral("ptime")).toInt();

    QDomElement child = element.firstChildElement(QStringLiteral("parameter"));
    while (!child.isNull()) {
        d->parameters.insert(child.attribute(QStringLiteral("name")), child.attribute(QStringLiteral("value")));
        child = child.nextSiblingElement(QStringLiteral("parameter"));
    }

    parseJingleRtpFeedbackNegotiationElements(element, d->rtpFeedbackProperties, d->rtpFeedbackIntervals);
}

void QXmppJinglePayloadType::toXml(QXmlStreamWriter *writer) const
{
    writer->writeStartElement(QStringLiteral("payload-type"));
    helperToXmlAddAttribute(writer, QStringLiteral("id"), QString::number(d->id));
    helperToXmlAddAttribute(writer, QStringLiteral("name"), d->name);
    if (d->channels > 1) {
        helperToXmlAddAttribute(writer, QStringLiteral("channels"), QString::number(d->channels));
    }
    if (d->clockrate > 0) {
        helperToXmlAddAttribute(writer, QStringLiteral("clockrate"), QString::number(d->clockrate));
    }
    if (d->maxptime > 0) {
        helperToXmlAddAttribute(writer, QStringLiteral("maxptime"), QString::number(d->maxptime));
    }
    if (d->ptime > 0) {
        helperToXmlAddAttribute(writer, QStringLiteral("ptime"), QString::number(d->ptime));
    }

    for (auto itr = d->parameters.begin(); itr != d->parameters.end(); itr++) {
        writer->writeStartElement(QStringLiteral("parameter"));
        writer->writeAttribute(QStringLiteral("name"), itr.key());
        writer->writeAttribute(QStringLiteral("value"), itr.value());
        writer->writeEndElement();
    }

    jingleRtpFeedbackNegotiationElementsToXml(writer, d->rtpFeedbackProperties, d->rtpFeedbackIntervals);

    writer->writeEndElement();
}
/// \endcond

/// Assigns the other payload type to this one.
///
/// \param other

QXmppJinglePayloadType &QXmppJinglePayloadType::operator=(const QXmppJinglePayloadType &other)
{
    d = other.d;
    return *this;
}

/// Returns true if this QXmppJinglePayloadType and \a other refer to the same payload type.
///
/// \param other

bool QXmppJinglePayloadType::operator==(const QXmppJinglePayloadType &other) const
{
    // FIXME : what to do with m_ptime and m_maxptime?
    if (d->id <= 95) {
        return other.d->id == d->id && other.d->clockrate == d->clockrate;
    } else {
        return other.d->channels == d->channels &&
            other.d->clockrate == d->clockrate &&
            other.d->name.toLower() == d->name.toLower();
    }
}

class QXmppSdpParameterPrivate : public QSharedData
{
public:
    QString name;
    QString value;
};

///
/// \class QXmppSdpParameter
///
/// \brief The QXmppSdpParameter class represents a Session Description Protocol (SDP) parameter
/// specified by RFC 4566 and used by several XEPs based on \xep{0166, Jingle}.
///
/// \since QXmpp 1.5
///

///
/// Constructs a Session Description Protocol parameter.
///
QXmppSdpParameter::QXmppSdpParameter()
    : d(new QXmppSdpParameterPrivate())
{
}

QXMPP_PRIVATE_DEFINE_RULE_OF_SIX(QXmppSdpParameter)

///
/// Returns the name of the parameter.
///
/// \return the parameter's name
///
QString QXmppSdpParameter::name() const
{
    return d->name;
}

///
/// Sets the name of the parameter.
///
/// \param name parameter's name
///
void QXmppSdpParameter::setName(const QString &name)
{
    d->name = name;
}

///
/// Returns the value of the parameter.
///
/// \return the parameter's value
///
QString QXmppSdpParameter::value() const
{
    return d->value;
}

///
/// Sets the value of the parameter.
///
/// A parameter in the form "a=b" can be created by this method.
/// Any other form of parameters can be created by not using this method.
/// The value stays a default-constructed QString then.
///
/// \param value parameter's value
///
void QXmppSdpParameter::setValue(const QString &value)
{
    d->value = value;
}

/// \cond
void QXmppSdpParameter::parse(const QDomElement &element)
{
    d->name = element.attribute(QStringLiteral("name"));
    d->value = element.attribute(QStringLiteral("value"));
}

void QXmppSdpParameter::toXml(QXmlStreamWriter *writer) const
{
    writer->writeStartElement(QStringLiteral("parameter"));
    helperToXmlAddAttribute(writer, QStringLiteral("name"), d->name);

    if (!d->value.isEmpty()) {
        helperToXmlAddAttribute(writer, QStringLiteral("value"), d->value);
    }

    writer->writeEndElement();
}
/// \endcond

///
/// Determines whether the given DOM element is a Session Description Protocol parameter element.
///
/// \param element DOM element being checked
///
/// \return whether element is a Session Description Protocol parameter element
///
bool QXmppSdpParameter::isSdpParameter(const QDomElement &element)
{
    return element.tagName() == QStringLiteral("parameter");
}

class QXmppJingleRtpCryptoElementPrivate : public QSharedData
{
public:
    uint32_t tag = 0;
    QString cryptoSuite;
    QString keyParams;
    QString sessionParams;
};

///
/// \class QXmppJingleRtpCryptoElement
///
/// \brief The QXmppJingleRtpCryptoElement class represents the \xep{0167: Jingle RTP Sessions}
/// "crypto" element used for SRTP negotiation.
///
/// \since QXmpp 1.5
///

///
/// Constructs a Jingle RTP crypto element.
///
QXmppJingleRtpCryptoElement::QXmppJingleRtpCryptoElement()
    : d(new QXmppJingleRtpCryptoElementPrivate())
{
}

QXMPP_PRIVATE_DEFINE_RULE_OF_SIX(QXmppJingleRtpCryptoElement)

///
/// Returns the tag used as an identifier for the crypto element.
///
/// \return the identifying tag
///
uint32_t QXmppJingleRtpCryptoElement::tag() const
{
    return d->tag;
}

///
/// Sets the tag used as an identifier for the crypto element.
///
/// \param tag identifying tag
///
void QXmppJingleRtpCryptoElement::setTag(uint32_t tag)
{
    d->tag = tag;
}

///
/// Returns the crypto suite used as an identifier for describing the encryption and authentication
/// algorithms.
///
/// \return the identifying crypto suite
///
QString QXmppJingleRtpCryptoElement::cryptoSuite() const
{
    return d->cryptoSuite;
}

///
/// Sets the crypto suite used as an identifier for describing the encryption and authentication
/// algorithms.
///
/// \param cryptoSuite identifying crypto suite
///
void QXmppJingleRtpCryptoElement::setCryptoSuite(const QString &cryptoSuite)
{
    d->cryptoSuite = cryptoSuite;
}

///
/// Returns the key parameters providing one or more sets of keying material for the crypto suite.
///
/// \return the key parameters providing one or more sets of keying material
///
QString QXmppJingleRtpCryptoElement::keyParams() const
{
    return d->keyParams;
}

///
/// Sets the key parameters providing one or more sets of keying material for the crypto suite.
///
/// \param keyParams key parameters providing one or more sets of keying material
///
void QXmppJingleRtpCryptoElement::setKeyParams(const QString &keyParams)
{
    d->keyParams = keyParams;
}

///
/// Returns the session parameters providing transport-specific data.
///
/// \return the session parameters providing transport-specific data
///
QString QXmppJingleRtpCryptoElement::sessionParams() const
{
    return d->sessionParams;
}

///
/// Sets the session parameters providing transport-specific data.
///
/// \param sessionParams session parameters providing transport-specific data
///
void QXmppJingleRtpCryptoElement::setSessionParams(const QString &sessionParams)
{
    d->sessionParams = sessionParams;
}

/// \cond
void QXmppJingleRtpCryptoElement::parse(const QDomElement &element)
{
    d->tag = element.attribute(QStringLiteral("tag")).toUInt();
    d->cryptoSuite = element.attribute(QStringLiteral("crypto-suite"));
    d->keyParams = element.attribute(QStringLiteral("key-params"));
    d->sessionParams = element.attribute(QStringLiteral("session-params"));
}

void QXmppJingleRtpCryptoElement::toXml(QXmlStreamWriter *writer) const
{
    if (!d->cryptoSuite.isEmpty() && !d->keyParams.isEmpty()) {
        writer->writeStartElement(QStringLiteral("crypto"));
        writer->writeAttribute(QStringLiteral("tag"), QString::number(d->tag));
        writer->writeAttribute(QStringLiteral("crypto-suite"), d->cryptoSuite);
        writer->writeAttribute(QStringLiteral("key-params"), d->keyParams);
        helperToXmlAddAttribute(writer, QStringLiteral("session-params"), d->sessionParams);
        writer->writeEndElement();
    }
}
/// \endcond

///
/// Determines whether the given DOM element is an RTP crypto element.
///
/// \param element DOM element being checked
///
/// \return whether element is an RTP crypto element
///
bool QXmppJingleRtpCryptoElement::isJingleRtpCryptoElement(const QDomElement &element)
{
    return element.tagName() == QStringLiteral("crypto");
}

class QXmppJingleRtpEncryptionPrivate : public QSharedData
{
public:
    bool isRequired = false;
    QVector<QXmppJingleRtpCryptoElement> cryptoElements;
};

///
/// \class QXmppJingleRtpEncryption
///
/// \brief The QXmppJingleRtpEncryption class represents the \xep{0167: Jingle RTP Sessions}
/// "encryption" element used for SRTP negotiation.
///
/// \since QXmpp 1.5
///

///
/// Constructs a Jingle RTP encryption.
///
QXmppJingleRtpEncryption::QXmppJingleRtpEncryption()
    : d(new QXmppJingleRtpEncryptionPrivate())
{
}

QXMPP_PRIVATE_DEFINE_RULE_OF_SIX(QXmppJingleRtpEncryption)

///
/// Returns whether encryption via SRTP is required.
///
/// \return whether encryption is required
///
bool QXmppJingleRtpEncryption::isRequired() const
{
    return d->isRequired;
}

///
/// Sets whether encryption via SRTP is required.
///
/// \param isRequired whether encryption is required
///
void QXmppJingleRtpEncryption::setRequired(bool isRequired)
{
    d->isRequired = isRequired;
}

///
/// Returns the crypto elements used for encryption via SRTP.
///
/// \return the crypto elements
///
QVector<QXmppJingleRtpCryptoElement> QXmppJingleRtpEncryption::cryptoElements() const
{
    return d->cryptoElements;
}

///
/// Sets the crypto elements used for encryption via SRTP.
///
/// \param cryptoElements the crypto elements
///
void QXmppJingleRtpEncryption::setCryptoElements(const QVector<QXmppJingleRtpCryptoElement> &cryptoElements)
{
    d->cryptoElements = cryptoElements;
}

/// \cond
void QXmppJingleRtpEncryption::parse(const QDomElement &element)
{
    d->isRequired = element.attribute(QStringLiteral("required")) == QStringLiteral("true") ||
        element.attribute(QStringLiteral("required")) == QStringLiteral("1");

    for (auto childElement = element.firstChildElement();
         !childElement.isNull();
         childElement = childElement.nextSiblingElement()) {
        if (QXmppJingleRtpCryptoElement::isJingleRtpCryptoElement(childElement)) {
            QXmppJingleRtpCryptoElement cryptoElement;
            cryptoElement.parse(childElement);
            d->cryptoElements.append(std::move(cryptoElement));
        }
    }
}

void QXmppJingleRtpEncryption::toXml(QXmlStreamWriter *writer) const
{
    if (!d->cryptoElements.isEmpty()) {
        writer->writeStartElement(QStringLiteral("encryption"));
        writer->writeDefaultNamespace(ns_jingle_rtp);

        if (d->isRequired) {
            writer->writeAttribute(QStringLiteral("required"), QStringLiteral("1"));
        }

        for (const auto &cryptoElement : std::as_const(d->cryptoElements)) {
            cryptoElement.toXml(writer);
        }

        writer->writeEndElement();
    }
}
/// \endcond

///
/// Determines whether the given DOM element is an RTP encryption element.
///
/// \param element DOM element being checked
///
/// \return whether element is an RTP encryption element
///
bool QXmppJingleRtpEncryption::isJingleRtpEncryption(const QDomElement &element)
{
    return element.tagName() == QStringLiteral("encryption") &&
        element.namespaceURI() == ns_jingle_rtp;
}

class QXmppJingleRtpFeedbackPropertyPrivate : public QSharedData
{
public:
    QString type;
    QString subtype;
    QVector<QXmppSdpParameter> parameters;
};

///
/// \class QXmppJingleRtpFeedbackProperty
///
/// \brief The QXmppJingleRtpFeedbackProperty class represents the
/// \xep{0293, Jingle RTP Feedback Negotiation} "rtcp-fb" element.
///
/// \since QXmpp 1.5
///

///
/// Constructs a Jingle RTP feedback property.
///
QXmppJingleRtpFeedbackProperty::QXmppJingleRtpFeedbackProperty()
    : d(new QXmppJingleRtpFeedbackPropertyPrivate())
{
}

QXMPP_PRIVATE_DEFINE_RULE_OF_SIX(QXmppJingleRtpFeedbackProperty)

///
/// Returns the type of RTP feedback.
///
/// \return the RTP feedback type
///
QString QXmppJingleRtpFeedbackProperty::type() const
{
    return d->type;
}

///
/// Sets the type of RTP feedback.
///
/// \param type RTP feedback type
///
void QXmppJingleRtpFeedbackProperty::setType(const QString &type)
{
    d->type = type;
}

///
/// Returns the subtype for RTP feedback.
///
/// \return the RTP feedback subtype
///
QString QXmppJingleRtpFeedbackProperty::subtype() const
{
    return d->subtype;
}

///
/// Sets the subtype of RTP feedback.
///
/// If there is more than one parameter, use QXmppJingleRtpFeedbackProperty::setParameters()
/// instead of this method.
///
/// \param subtype RTP feedback subtype
///
void QXmppJingleRtpFeedbackProperty::setSubtype(const QString &subtype)
{
    d->subtype = subtype;
}

///
/// Returns the parameters of RTP feedback.
///
/// \return the RTP feedback parameters
///
QVector<QXmppSdpParameter> QXmppJingleRtpFeedbackProperty::parameters() const
{
    return d->parameters;
}

///
/// Sets the parameters of RTP feedback.
///
/// Additional parameters can be set by this method.
/// If there is only one parameter, use QXmppJingleRtpFeedbackProperty::setSubtype()
/// instead of this method.
///
/// \param parameters RTP feedback parameters
///
void QXmppJingleRtpFeedbackProperty::setParameters(const QVector<QXmppSdpParameter> &parameters)
{
    d->parameters = parameters;
}

/// \cond
void QXmppJingleRtpFeedbackProperty::parse(const QDomElement &element)
{
    d->type = element.attribute(QStringLiteral("type"));
    d->subtype = element.attribute(QStringLiteral("subtype"));
    parseSdpParameters(element, d->parameters);
}

void QXmppJingleRtpFeedbackProperty::toXml(QXmlStreamWriter *writer) const
{
    writer->writeStartElement(QStringLiteral("rtcp-fb"));
    writer->writeDefaultNamespace(ns_jingle_rtp_feedback_negotiation);
    helperToXmlAddAttribute(writer, QStringLiteral("type"), d->type);

    // If there are parameters, they must be used instead of the subtype.
    if (d->subtype.isEmpty()) {
        sdpParametersToXml(writer, d->parameters);
    } else {
        helperToXmlAddAttribute(writer, QStringLiteral("subtype"), d->subtype);
    }

    writer->writeEndElement();
}
/// \endcond

///
/// Determines whether the given DOM element is an RTP feedback property element.
///
/// \param element DOM element being checked
///
/// \return whether element is an RTP feedback property element
///
bool QXmppJingleRtpFeedbackProperty::isJingleRtpFeedbackProperty(const QDomElement &element)
{
    return element.tagName() == QStringLiteral("rtcp-fb") &&
        element.namespaceURI() == ns_jingle_rtp_feedback_negotiation;
}

///
/// \class QXmppJingleRtpFeedbackInterval
///
/// \brief The QXmppJingleRtpFeedbackInterval class represents the
/// \xep{0293, Jingle RTP Feedback Negotiation} "rtcp-fb-trr-int" element.
///
/// \since QXmpp 1.5
///

///
/// Constructs a Jingle RTP feedback interval.
///
QXmppJingleRtpFeedbackInterval::QXmppJingleRtpFeedbackInterval()
{
}

QXMPP_PRIVATE_DEFINE_RULE_OF_SIX(QXmppJingleRtpFeedbackInterval)

///
/// Returns the value of the RTP feedback interval.
///
/// \return the RTP feedback interval value
///
uint64_t QXmppJingleRtpFeedbackInterval::value() const
{
    return m_value;
}

///
/// Sets the value of the RTP feedback interval.
///
/// \param value RTP feedback interval value
///
void QXmppJingleRtpFeedbackInterval::setValue(uint64_t value)
{
    m_value = value;
}

/// \cond
void QXmppJingleRtpFeedbackInterval::parse(const QDomElement &element)
{
    m_value = element.attribute(QStringLiteral("value")).toUInt();
}

void QXmppJingleRtpFeedbackInterval::toXml(QXmlStreamWriter *writer) const
{
    writer->writeStartElement(QStringLiteral("rtcp-fb-trr-int"));
    writer->writeDefaultNamespace(ns_jingle_rtp_feedback_negotiation);
    helperToXmlAddAttribute(writer, QStringLiteral("value"), QString::number(m_value));
    writer->writeEndElement();
}
/// \endcond

///
/// Determines whether the given DOM element is an RTP feedback interval element.
///
/// \param element DOM element being checked
///
/// \return whether element is an RTP feedback interval element
///
bool QXmppJingleRtpFeedbackInterval::isJingleRtpFeedbackInterval(const QDomElement &element)
{
    return element.tagName() == QStringLiteral("rtcp-fb-trr-int") &&
        element.namespaceURI() == ns_jingle_rtp_feedback_negotiation;
}

class QXmppJingleRtpHeaderExtensionPropertyPrivate : public QSharedData
{
public:
    uint32_t id = 0;
    QString uri;
    QXmppJingleRtpHeaderExtensionProperty::Senders senders = QXmppJingleRtpHeaderExtensionProperty::Both;
    QVector<QXmppSdpParameter> parameters;
};

///
/// \enum QXmppJingleRtpHeaderExtensionProperty::Senders
///
/// Parties that are allowed to send the negotiated RTP header extension
///

///
/// \class QXmppJingleRtpHeaderExtensionProperty
///
/// \brief The QXmppJingleRtpHeaderExtensionProperty class represents the
/// \xep{0294, Jingle RTP Header Extensions Negotiation} "rtp-hdrext" element.
///
/// \since QXmpp 1.5
///

///
/// Constructs a Jingle RTP header extension property.
///
QXmppJingleRtpHeaderExtensionProperty::QXmppJingleRtpHeaderExtensionProperty()
    : d(new QXmppJingleRtpHeaderExtensionPropertyPrivate())
{
}

QXMPP_PRIVATE_DEFINE_RULE_OF_SIX(QXmppJingleRtpHeaderExtensionProperty)

///
/// Returns the ID of the RTP header extension.
///
/// The ID is 0 if it is unset.
///
/// \return the RTP header extension's ID
///
uint32_t QXmppJingleRtpHeaderExtensionProperty::id() const
{
    return d->id;
}

///
/// Sets the ID of the RTP header extension.
///
/// The ID must either be at least 1 and at most 256 or at least 4096 and at most 4351.
///
/// \param id RTP header extension's ID
///
void QXmppJingleRtpHeaderExtensionProperty::setId(uint32_t id)
{
    d->id = id;
}

///
/// Returns the URI defning the RTP header extension.
///
/// \return the RTP header extension's URI
///
QString QXmppJingleRtpHeaderExtensionProperty::uri() const
{
    return d->uri;
}

///
/// Sets the URI defning the RTP header extension.
///
/// \param uri RTP header extension's URI
///
void QXmppJingleRtpHeaderExtensionProperty::setUri(const QString &uri)
{
    d->uri = uri;
}

///
/// Returns the parties that are allowed to send the negotiated RTP header extensions.
///
/// \return the parties that are allowed to send the RTP header extensions
///
QXmppJingleRtpHeaderExtensionProperty::Senders QXmppJingleRtpHeaderExtensionProperty::senders() const
{
    return d->senders;
}

///
/// Sets the parties that are allowed to send the negotiated RTP header extensions.
///
/// \param senders parties that are allowed to send the RTP header extensions
///
void QXmppJingleRtpHeaderExtensionProperty::setSenders(Senders senders)
{
    d->senders = senders;
}

///
/// Returns the parameters of the RTP header extension.
///
/// \return the RTP header extension's parameters
///
QVector<QXmppSdpParameter> QXmppJingleRtpHeaderExtensionProperty::parameters() const
{
    return d->parameters;
}

///
/// Sets the parameters of the RTP header extension.
///
/// Additional parameters can be set by this method.
///
/// \param parameters RTP header extension's parameters
///
void QXmppJingleRtpHeaderExtensionProperty::setParameters(const QVector<QXmppSdpParameter> &parameters)
{
    d->parameters = parameters;
}

/// \cond
void QXmppJingleRtpHeaderExtensionProperty::parse(const QDomElement &element)
{
    if (element.tagName() == QStringLiteral("rtp-hdrext") && element.namespaceURI() == ns_jingle_rtp_header_extensions_negotiation) {
        d->id = element.attribute(QStringLiteral("id")).toUInt();
        d->uri = element.attribute(QStringLiteral("uri"));

        if (const auto senders = JINGLE_RTP_HEADER_EXTENSIONS_SENDERS.indexOf(element.attribute(QStringLiteral("senders"))); senders > QXmppJingleRtpHeaderExtensionProperty::Both) {
            d->senders = static_cast<QXmppJingleRtpHeaderExtensionProperty::Senders>(senders);
        }

        parseSdpParameters(element, d->parameters);
    }
}

void QXmppJingleRtpHeaderExtensionProperty::toXml(QXmlStreamWriter *writer) const
{
    writer->writeStartElement(QStringLiteral("rtp-hdrext"));
    writer->writeDefaultNamespace(ns_jingle_rtp_header_extensions_negotiation);
    helperToXmlAddAttribute(writer, QStringLiteral("id"), QString::number(d->id));
    helperToXmlAddAttribute(writer, QStringLiteral("uri"), d->uri);

    if (d->senders != QXmppJingleRtpHeaderExtensionProperty::Both) {
        helperToXmlAddAttribute(writer, QStringLiteral("senders"), JINGLE_RTP_HEADER_EXTENSIONS_SENDERS.at(d->senders));
    }

    sdpParametersToXml(writer, d->parameters);

    writer->writeEndElement();
}
/// \endcond

///
/// Determines whether the given DOM element is an RTP header extensions property element.
///
/// \param element DOM element being checked
///
/// \return whether element is an RTP header extension property element
///
bool QXmppJingleRtpHeaderExtensionProperty::isJingleRtpHeaderExtensionProperty(const QDomElement &element)
{
    return element.tagName() == QStringLiteral("rtp-hdrext") &&
        element.namespaceURI() == ns_jingle_rtp_header_extensions_negotiation;
}