// SPDX-FileCopyrightText: 2010 Jeremy Lainé <jeremy.laine@m4x.org>
//
// SPDX-License-Identifier: LGPL-2.1-or-later

#include "QXmppMucManager.h"

#include "QXmppClient.h"
#include "QXmppConstants_p.h"
#include "QXmppDiscoveryManager.h"
#include "QXmppMessage.h"
#include "QXmppMucIq.h"
#include "QXmppTask.h"
#include "QXmppUtils.h"

#include <QDomElement>
#include <QMap>

using namespace QXmpp;
using namespace QXmpp::Private;

class QXmppMucManagerPrivate
{
public:
    QMap<QString, QXmppMucRoom *> rooms;
};

class QXmppMucRoomPrivate
{
public:
    QString ownJid() const { return jid + u'/' + nickName; }
    QXmppClient *client;
    QXmppDiscoveryManager *discoManager;
    QXmppMucRoom::Actions allowedActions;
    QString jid;
    QString name;
    QMap<QString, QXmppPresence> participants;
    QString password;
    QMap<QString, QXmppMucItem> permissions;
    QSet<QString> permissionsQueue;
    QString nickName;
    QString subject;
};

///
/// Constructs a new QXmppMucManager.
///
QXmppMucManager::QXmppMucManager()
    : d(std::make_unique<QXmppMucManagerPrivate>())
{
}

QXmppMucManager::~QXmppMucManager() = default;

/// Adds the given chat room to the set of managed rooms.
///
/// \param roomJid

QXmppMucRoom *QXmppMucManager::addRoom(const QString &roomJid)
{
    QXmppMucRoom *room = d->rooms.value(roomJid);
    if (!room) {
        room = new QXmppMucRoom(client(), roomJid, this);
        d->rooms.insert(roomJid, room);
        connect(room, &QObject::destroyed,
                this, &QXmppMucManager::_q_roomDestroyed);

        // emit signal
        Q_EMIT roomAdded(room);
    }
    return room;
}

QList<QXmppMucRoom *> QXmppMucManager::rooms() const
{
    return d->rooms.values();
}

/// \cond
QStringList QXmppMucManager::discoveryFeatures() const
{
    // XEP-0045: Multi-User Chat
    return {
        ns_muc.toString(),
        ns_muc_admin.toString(),
        ns_muc_owner.toString(),
        ns_muc_user.toString(),
        ns_conference.toString(),
    };
}

bool QXmppMucManager::handleStanza(const QDomElement &element)
{
    if (element.tagName() == u"iq") {
        if (QXmppMucAdminIq::isMucAdminIq(element)) {
            QXmppMucAdminIq iq;
            iq.parse(element);

            QXmppMucRoom *room = d->rooms.value(iq.from());
            if (room && iq.type() == QXmppIq::Result && room->d->permissionsQueue.remove(iq.id())) {
                const auto items = iq.items();
                for (const auto &item : items) {
                    const QString jid = item.jid();
                    if (!room->d->permissions.contains(jid)) {
                        room->d->permissions.insert(jid, item);
                    }
                }
                if (room->d->permissionsQueue.isEmpty()) {
                    Q_EMIT room->permissionsReceived(room->d->permissions.values());
                }
                return true;
            }
        } else if (QXmppMucOwnerIq::isMucOwnerIq(element)) {
            QXmppMucOwnerIq iq;
            iq.parse(element);

            QXmppMucRoom *room = d->rooms.value(iq.from());
            if (room && iq.type() == QXmppIq::Result && !iq.form().isNull()) {
                Q_EMIT room->configurationReceived(iq.form());
                return true;
            }
        }
    }
    return false;
}

void QXmppMucManager::onRegistered(QXmppClient *client)
{
    connect(client, &QXmppClient::messageReceived,
            this, &QXmppMucManager::_q_messageReceived);
}

void QXmppMucManager::onUnregistered(QXmppClient *client)
{
    disconnect(client, &QXmppClient::messageReceived,
               this, &QXmppMucManager::_q_messageReceived);
}
/// \endcond

void QXmppMucManager::_q_messageReceived(const QXmppMessage &msg)
{
    if (msg.type() != QXmppMessage::Normal) {
        return;
    }

    // process room invitations
    const QString roomJid = msg.mucInvitationJid();
    if (!roomJid.isEmpty() && (!d->rooms.contains(roomJid) || !d->rooms.value(roomJid)->isJoined())) {
        Q_EMIT invitationReceived(roomJid, msg.from(), msg.mucInvitationReason());
    }
}

void QXmppMucManager::_q_roomDestroyed(QObject *object)
{
    const QString key = d->rooms.key(static_cast<QXmppMucRoom *>(object));
    d->rooms.remove(key);
}

/// Constructs a new QXmppMucRoom.
///
/// \param parent

QXmppMucRoom::QXmppMucRoom(QXmppClient *client, const QString &jid, QObject *parent)
    : QObject(parent),
      d(std::make_unique<QXmppMucRoomPrivate>())
{
    d->allowedActions = NoAction;
    d->client = client;
    d->discoManager = client->findExtension<QXmppDiscoveryManager>();
    d->jid = jid;

    connect(d->client, &QXmppClient::disconnected,
            this, &QXmppMucRoom::_q_disconnected);

    connect(d->client, &QXmppClient::messageReceived,
            this, &QXmppMucRoom::_q_messageReceived);

    connect(d->client, &QXmppClient::presenceReceived,
            this, &QXmppMucRoom::_q_presenceReceived);

    // convenience signals for properties
    connect(this, &QXmppMucRoom::joined, this, &QXmppMucRoom::isJoinedChanged);
    connect(this, &QXmppMucRoom::left, this, &QXmppMucRoom::isJoinedChanged);
}

QXmppMucRoom::~QXmppMucRoom() = default;

QXmppMucRoom::Actions QXmppMucRoom::allowedActions() const
{
    return d->allowedActions;
}

///
/// Bans the specified user from the chat room.
///
/// The specified \a jid is the Bare JID of the form "user@host".
///
/// \return true if the request was sent, false otherwise
///
bool QXmppMucRoom::ban(const QString &jid, const QString &reason)
{
    if (!QXmppUtils::jidToResource(jid).isEmpty()) {
        qWarning("QXmppMucRoom::ban expects a bare JID");
        return false;
    }

    QXmppMucItem item;
    item.setAffiliation(QXmppMucItem::OutcastAffiliation);
    item.setJid(jid);
    item.setReason(reason);

    QXmppMucAdminIq iq;
    iq.setType(QXmppIq::Set);
    iq.setTo(d->jid);
    iq.setItems(QList<QXmppMucItem>() << item);

    return d->client->sendLegacy(iq);
}

bool QXmppMucRoom::isJoined() const
{
    return d->participants.contains(d->ownJid());
}

QString QXmppMucRoom::jid() const
{
    return d->jid;
}

///
/// Joins the chat room.
///
/// \return true if the request was sent, false otherwise
///
bool QXmppMucRoom::join()
{
    if (isJoined() || d->nickName.isEmpty()) {
        return false;
    }

    // reflect our current presence in the chat room
    QXmppPresence packet = d->client->clientPresence();
    packet.setTo(d->ownJid());
    packet.setType(QXmppPresence::Available);
    packet.setMucPassword(d->password);
    packet.setMucSupported(true);
    return d->client->sendLegacy(packet);
}

///
/// Kicks the specified user from the chat room.
///
/// The specified \a jid is the Occupant JID of the form "room@service/nick".
///
/// \return true if the request was sent, false otherwise
///
bool QXmppMucRoom::kick(const QString &jid, const QString &reason)
{
    QXmppMucItem item;
    item.setNick(QXmppUtils::jidToResource(jid));
    item.setRole(QXmppMucItem::NoRole);
    item.setReason(reason);

    QXmppMucAdminIq iq;
    iq.setType(QXmppIq::Set);
    iq.setTo(d->jid);
    iq.setItems(QList<QXmppMucItem>() << item);

    return d->client->sendLegacy(iq);
}

///
/// Leaves the chat room.
///
/// \param message An optional message.
///
/// \return true if the request was sent, false otherwise
///
bool QXmppMucRoom::leave(const QString &message)
{
    QXmppPresence packet;
    packet.setTo(d->ownJid());
    packet.setType(QXmppPresence::Unavailable);
    packet.setStatusText(message);
    return d->client->sendLegacy(packet);
}

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

QString QXmppMucRoom::nickName() const
{
    return d->nickName;
}

///
/// Invites a user to the chat room.
///
/// \param jid
/// \param reason
///
/// \return true if the request was sent, false otherwise
///
bool QXmppMucRoom::sendInvitation(const QString &jid, const QString &reason)
{
    QXmppMessage message;
    message.setTo(jid);
    message.setType(QXmppMessage::Normal);
    message.setMucInvitationJid(d->jid);
    message.setMucInvitationReason(reason);
    return d->client->sendLegacy(message);
}

///
/// Sends a message to the room.
///
/// This is just a helper function, you can as well also send a message to the
/// channel manually by setting the message type to 'groupchat' and addressing
/// the JID of the MUC room.
///
/// \return true if the request was sent, false otherwise
///
bool QXmppMucRoom::sendMessage(const QString &text)
{
    QXmppMessage msg;
    msg.setTo(d->jid);
    msg.setType(QXmppMessage::GroupChat);
    msg.setBody(text);
    return d->client->sendLegacy(msg);
}

///
/// Sets your own nickname.
///
/// You need to set your nickname before calling join().
///
/// \param nickName
///
void QXmppMucRoom::setNickName(const QString &nickName)
{
    if (nickName == d->nickName) {
        return;
    }

    // if we had already joined the room, request nickname change
    if (isJoined()) {
        QXmppPresence packet = d->client->clientPresence();
        packet.setTo(d->jid + u'/' + nickName);
        packet.setType(QXmppPresence::Available);
        d->client->send(std::move(packet));
    } else {
        d->nickName = nickName;
        Q_EMIT nickNameChanged(nickName);
    }
}

///
/// Returns the "Full JID" of the given participant.
///
/// The specified \a jid is the Occupant JID of the form "room@service/nick".
///
QString QXmppMucRoom::participantFullJid(const QString &jid) const
{
    if (d->participants.contains(jid)) {
        return d->participants.value(jid).mucItem().jid();
    } else {
        return QString();
    }
}

///
/// Returns the presence for the given participant.
///
/// The specified \a jid is the Occupant JID of the form "room@service/nick".
///
QXmppPresence QXmppMucRoom::participantPresence(const QString &jid) const
{
    if (d->participants.contains(jid)) {
        return d->participants.value(jid);
    }

    QXmppPresence presence;
    presence.setFrom(jid);
    presence.setType(QXmppPresence::Unavailable);
    return presence;
}

QStringList QXmppMucRoom::participants() const
{
    return d->participants.keys();
}

QString QXmppMucRoom::password() const
{
    return d->password;
}

///
/// Sets the chat room password.
///
/// \param password
///
void QXmppMucRoom::setPassword(const QString &password)
{
    d->password = password;
}

QString QXmppMucRoom::subject() const
{
    return d->subject;
}

///
/// Sets the chat room's subject.
///
/// \param subject
///
void QXmppMucRoom::setSubject(const QString &subject)
{
    QXmppMessage msg;
    msg.setTo(d->jid);
    msg.setType(QXmppMessage::GroupChat);
    msg.setSubject(subject);
    d->client->send(std::move(msg));
}

///
/// Request the configuration form for the chat room.
///
/// \return true if the request was sent, false otherwise
///
/// \sa configurationReceived()
///
bool QXmppMucRoom::requestConfiguration()
{
    QXmppMucOwnerIq iq;
    iq.setTo(d->jid);
    return d->client->sendLegacy(iq);
}

///
/// Send the configuration form for the chat room.
///
/// \param form
///
/// \return true if the request was sent, false otherwise
///
bool QXmppMucRoom::setConfiguration(const QXmppDataForm &form)
{
    QXmppMucOwnerIq iqPacket;
    iqPacket.setType(QXmppIq::Set);
    iqPacket.setTo(d->jid);
    iqPacket.setForm(form);
    return d->client->sendLegacy(iqPacket);
}

///
/// Request the room's permissions.
///
/// \return true if the request was sent, false otherwise
///
/// \sa permissionsReceived()
///
bool QXmppMucRoom::requestPermissions()
{
    QList<QXmppMucItem::Affiliation> affiliations;
    affiliations << QXmppMucItem::OwnerAffiliation;
    affiliations << QXmppMucItem::AdminAffiliation;
    affiliations << QXmppMucItem::MemberAffiliation;
    affiliations << QXmppMucItem::OutcastAffiliation;

    d->permissions.clear();
    d->permissionsQueue.clear();
    for (const auto &affiliation : std::as_const(affiliations)) {
        QXmppMucItem item;
        item.setAffiliation(affiliation);

        QXmppMucAdminIq iq;
        iq.setTo(d->jid);
        iq.setItems(QList<QXmppMucItem>() << item);
        if (!d->client->sendLegacy(iq)) {
            return false;
        }
        d->permissionsQueue += iq.id();
    }
    return true;
}

///
/// Sets the room's permissions.
///
/// \param permissions
///
/// \return true if the request was sent, false otherwise
///
bool QXmppMucRoom::setPermissions(const QList<QXmppMucItem> &permissions)
{
    QList<QXmppMucItem> items;

    // Process changed members
    for (const auto &item : std::as_const(permissions)) {
        const QString jid = item.jid();
        if (d->permissions.value(jid).affiliation() != item.affiliation()) {
            items << item;
        }
        d->permissions.remove(jid);
    }

    // Process deleted members
    const auto &jids = d->permissions.keys();
    for (const auto &jid : jids) {
        QXmppMucItem item;
        item.setAffiliation(QXmppMucItem::NoAffiliation);
        item.setJid(jid);
        items << item;
        d->permissions.remove(jid);
    }

    // Don't send request if there are no changes
    if (items.isEmpty()) {
        return false;
    }

    QXmppMucAdminIq iq;
    iq.setTo(d->jid);
    iq.setType(QXmppIq::Set);
    iq.setItems(items);
    return d->client->sendLegacy(iq);
}

void QXmppMucRoom::_q_disconnected()
{
    const bool wasJoined = isJoined();

    // clear chat room participants
    const QStringList removed = d->participants.keys();
    d->participants.clear();
    for (const auto &jid : removed) {
        Q_EMIT participantRemoved(jid);
    }
    Q_EMIT participantsChanged();

    // update available actions
    if (d->allowedActions != NoAction) {
        d->allowedActions = NoAction;
        Q_EMIT allowedActionsChanged(d->allowedActions);
    }

    // emit "left" signal if we had joined the room
    if (wasJoined) {
        Q_EMIT left();
    }
}

void QXmppMucRoom::_q_messageReceived(const QXmppMessage &message)
{
    if (QXmppUtils::jidToBareJid(message.from()) != d->jid) {
        return;
    }

    // handle message subject
    const QString subject = message.subject();
    if (!subject.isEmpty()) {
        d->subject = subject;
        Q_EMIT subjectChanged(subject);
    }

    Q_EMIT messageReceived(message);
}

void QXmppMucRoom::_q_presenceReceived(const QXmppPresence &presence)
{
    const QString jid = presence.from();

    // if our own presence changes, reflect it in the chat room
    if (isJoined() && jid == d->client->configuration().jid()) {
        QXmppPresence packet = d->client->clientPresence();
        packet.setTo(d->ownJid());
        d->client->send(std::move(packet));
    }

    if (QXmppUtils::jidToBareJid(jid) != d->jid) {
        return;
    }

    if (presence.type() == QXmppPresence::Available) {
        const bool added = !d->participants.contains(jid);
        d->participants.insert(jid, presence);

        // refresh allowed actions
        if (jid == d->ownJid()) {

            QXmppMucItem mucItem = presence.mucItem();
            Actions newActions = NoAction;

            // role
            if (mucItem.role() == QXmppMucItem::ModeratorRole) {
                newActions |= (KickAction | SubjectAction);
            }

            // affiliation
            if (mucItem.affiliation() == QXmppMucItem::OwnerAffiliation) {
                newActions |= (ConfigurationAction | PermissionsAction | SubjectAction);
            } else if (mucItem.affiliation() == QXmppMucItem::AdminAffiliation) {
                newActions |= (PermissionsAction | SubjectAction);
            }

            if (newActions != d->allowedActions) {
                d->allowedActions = newActions;
                Q_EMIT allowedActionsChanged(d->allowedActions);
            }
        }

        if (added) {
            Q_EMIT participantAdded(jid);
            Q_EMIT participantsChanged();
            if (jid == d->ownJid()) {
                // request room information
                if (d->discoManager) {
                    d->discoManager->info(d->jid).then(this, [this](auto &&result) {
                        if (!hasValue(result)) {
                            return;
                        }

                        QString name;
                        const auto &identities = getValue(result).identities();
                        for (const auto &identity : identities) {
                            if (identity.category() == u"conference") {
                                name = identity.name();
                                break;
                            }
                        }

                        if (name != d->name) {
                            d->name = name;
                            Q_EMIT nameChanged(name);
                        }
                    });
                }

                Q_EMIT joined();
            }
        } else {
            Q_EMIT participantChanged(jid);
        }
    } else if (presence.type() == QXmppPresence::Unavailable) {
        if (d->participants.contains(jid)) {
            d->participants.insert(jid, presence);

            Q_EMIT participantRemoved(jid);
            d->participants.remove(jid);
            Q_EMIT participantsChanged();

            // check whether this was our own presence
            if (jid == d->ownJid()) {
                const QString newNick = presence.mucItem().nick();
                if (!newNick.isEmpty() && newNick != d->nickName) {
                    d->nickName = newNick;
                    Q_EMIT nickNameChanged(newNick);
                    return;
                }

                // check whether we were kicked
                if (presence.mucStatusCodes().contains(307)) {
                    const QString actor = presence.mucItem().actor();
                    const QString reason = presence.mucItem().reason();
                    Q_EMIT kicked(actor, reason);
                }

                // clear chat room participants
                const QStringList removed = d->participants.keys();
                d->participants.clear();
                for (const auto &jid : removed) {
                    Q_EMIT participantRemoved(jid);
                }
                Q_EMIT participantsChanged();

                // update available actions
                if (d->allowedActions != NoAction) {
                    d->allowedActions = NoAction;
                    Q_EMIT allowedActionsChanged(d->allowedActions);
                }

                // notify user we left the room
                Q_EMIT left();
            }
        }
    } else if (presence.type() == QXmppPresence::Error) {
        if (presence.isMucSupported()) {
            // emit error
            Q_EMIT error(presence.error());

            // notify the user we left the room
            Q_EMIT left();
        }
    }
}
