// Copyright (C) 2016 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Milian Wolff <milian.wolff@kdab.com>
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only

#include "qqmlwebsocketserver.h"
#include "qqmlwebsocket.h"

QT_USE_NAMESPACE

/*!
    \qmltype WebSocketServer
    \instantiates QQmlWebSocketServer
    \since 5.3

    \inqmlmodule QtWebSockets
    \ingroup websockets-qml
    \brief QML interface to QWebSocketServer.
*/

/*!
  \qmlproperty QUrl WebSocketServer::url
  Server url that client WebSockets can connect to. The url uses the \e ws:// scheme and includes the
  port the server listens to and the host address of the server.
*/

/*!
  \qmlproperty QString WebSocketServer::host
  The host address of the server. By default, localhost is used.
*/

/*!
  \qmlproperty int WebSocketServer::port
  The port this server is listening on. The value must be in the range 0-65535.

  By default, a port is chosen automatically.
*/

/*!
  \qmlproperty QString WebSocketServer::name
  The name of this server used during the http handshake phase.
*/

/*!
  \qmlproperty QStringList WebSocketServer::supportedSubprotocols
  \since 6.4
  The list of protocols supported by the server.
*/

/*!
  \qmlproperty QString WebSocketServer::errorString
  The stringified error message in case an error occurred.
*/

/*!
  \qmlproperty bool WebSocketServer::listen
  Set to true when the server should listen to client connections or false otherwise.
  When set to true, the server will listen on the specified url defined by host and port
  and, when accept is true, accepts incoming client connections. Otherwise the server is closed.
  By default, the server is not listening.
*/

/*!
  \qmlproperty bool WebSocketServer::accept
  Set to true to accept incoming client connections when the server is listening. When set to false,
  incoming connections are rejected. By default, connections are accepted.
*/

/*!
  \qmlsignal WebSocketServer::clientConnected(WebSocket webSocket)
  This signal is emitted when a client connects to this server. \a webSocket is the newly created \l [QML]{WebSocket}.
*/

QQmlWebSocketServer::QQmlWebSocketServer(QObject *parent)
    : QObject(parent)
    , m_host(QHostAddress(QHostAddress::LocalHost).toString())
    , m_port(0)
    , m_listen(false)
    , m_accept(true)
    , m_componentCompleted(true)
{
}

QQmlWebSocketServer::~QQmlWebSocketServer()
{

}

void QQmlWebSocketServer::classBegin()
{
    m_componentCompleted = false;
}

void QQmlWebSocketServer::componentComplete()
{
    init();
    m_componentCompleted = true;
}

QUrl QQmlWebSocketServer::url() const
{
    QUrl url;
    url.setPort(m_port);
    url.setHost(m_host);
    url.setScheme(QStringLiteral("ws"));
    return url;
}

QString QQmlWebSocketServer::host() const
{
    return m_host;
}

void QQmlWebSocketServer::setHost(const QString &host)
{
    if (host == m_host) {
        return;
    }

    m_host = host;
    emit hostChanged(host);
    emit urlChanged(url());

    updateListening();
}

int QQmlWebSocketServer::port() const
{
    return m_port;
}

void QQmlWebSocketServer::setPort(int port)
{
    if (port == m_port) {
        return;
    }

    if (port < 0 || port > 65535) {
        qWarning() << "QQmlWebSocketServer::setPort: port " << port << " is invalid. It must be in the range 0-65535.";
        return;
    }
    m_port = port;
    emit portChanged(port);
    emit urlChanged(url());

    if (m_componentCompleted && m_server->isListening()) {
        updateListening();
    }
}

QString QQmlWebSocketServer::errorString() const
{
    return m_server ? m_server->errorString() : tr("QQmlWebSocketServer is not ready.");
}

QString QQmlWebSocketServer::name() const
{
    return m_name;
}

void QQmlWebSocketServer::setName(const QString &name)
{
    if (name == m_name) {
        return;
    }

    m_name = name;
    emit nameChanged(name);

    if (m_componentCompleted) {
        init();
    }
}

void QQmlWebSocketServer::setSupportedSubprotocols(const QStringList &supportedSubprotocols)
{
    if (m_supportedSubprotocols == supportedSubprotocols)
        return;

    m_supportedSubprotocols = supportedSubprotocols;

    if (m_server)
        m_server->setSupportedSubprotocols(m_supportedSubprotocols);

    emit supportedSubprotocolsChanged(m_supportedSubprotocols);
}

bool QQmlWebSocketServer::listen() const
{
    return m_listen;
}

void QQmlWebSocketServer::setListen(bool listen)
{
    if (listen == m_listen) {
        return;
    }

    m_listen = listen;
    emit listenChanged(listen);

    updateListening();
}

bool QQmlWebSocketServer::accept() const
{
    return m_accept;
}

void QQmlWebSocketServer::setAccept(bool accept)
{
    if (accept == m_accept) {
        return;
    }

    m_accept = accept;
    emit acceptChanged(accept);

    if (m_componentCompleted) {
        if (!accept) {
            m_server->pauseAccepting();
        } else {
            m_server->resumeAccepting();
        }
    }
}

void QQmlWebSocketServer::init()
{
    // TODO: add support for wss, requires ssl configuration to be set from QML - realistic?
    m_server.reset(new QWebSocketServer(m_name, QWebSocketServer::NonSecureMode));

    connect(m_server.data(), &QWebSocketServer::newConnection,
            this, &QQmlWebSocketServer::newConnection);
    connect(m_server.data(), &QWebSocketServer::serverError,
            this, &QQmlWebSocketServer::serverError);
    connect(m_server.data(), &QWebSocketServer::closed,
            this, &QQmlWebSocketServer::closed);

    m_server->setSupportedSubprotocols(m_supportedSubprotocols);

    updateListening();
}

void QQmlWebSocketServer::updateListening()
{
    if (!m_server) {
        return;
    }

    if (m_server->isListening()) {
        m_server->close();
    }

    if (!m_listen || !m_server->listen(QHostAddress(m_host), m_port)) {
        return;
    }
    setPort(m_server->serverPort());
    setHost(m_server->serverAddress().toString());
}

void QQmlWebSocketServer::newConnection()
{
    emit clientConnected(new QQmlWebSocket(m_server->nextPendingConnection(), this));
}

void QQmlWebSocketServer::serverError()
{
    emit errorStringChanged(errorString());
}

void QQmlWebSocketServer::closed()
{
    setListen(false);
}

QStringList QQmlWebSocketServer::supportedSubprotocols() const
{
    return m_supportedSubprotocols;
}
