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/****************************************************************************
**
** Copyright (C) 2016 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Milian Wolff <milian.wolff@kdab.com>
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtWebChannel module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
**   * Redistributions of source code must retain the above copyright
**     notice, this list of conditions and the following disclaimer.
**   * Redistributions in binary form must reproduce the above copyright
**     notice, this list of conditions and the following disclaimer in
**     the documentation and/or other materials provided with the
**     distribution.
**   * Neither the name of The Qt Company Ltd nor the names of its
**     contributors may be used to endorse or promote products derived
**     from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef ChatServer_H
#define ChatServer_H

#include <QObject>
#include <QStringList>

QT_BEGIN_NAMESPACE

class QTimer;

class ChatServer : public QObject
{
    Q_OBJECT

    Q_PROPERTY(QStringList userList READ userList NOTIFY userListChanged)

public:
    explicit ChatServer(QObject *parent = 0);
    virtual ~ChatServer();

public:
    //a user logs in with the given username
    Q_INVOKABLE bool login(const QString& userName);

    //the user logs out, will be removed from userlist immediately
    Q_INVOKABLE bool logout(const QString& userName);

    //a user sends a message to all other users
    Q_INVOKABLE bool sendMessage(const QString& user, const QString& msg);

    //response of the keep alive signal from a client.
    // This is used to detect disconnects.
    Q_INVOKABLE void keepAliveResponse(const QString& user);

    QStringList userList() const;

protected slots:
    void sendKeepAlive();
    void checkKeepAliveResponses();

signals:
    void newMessage(QString time, QString user, QString msg);
    void keepAlive();
    void userListChanged();
    void userCountChanged();

private:
    QStringList m_userList;
    QStringList m_stillAliveUsers;
    QTimer* m_keepAliveCheckTimer;
};

QT_END_NAMESPACE

#endif // ChatServer_H