/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 *                                                                         *
 *  Copyright (C) 2015 Simon Stuerz <simon.stuerz@guh.guru>                *
 *  Copyright (C) 2014 Michael Zanetti <michael_zanetti@gmx.net>           *
 *                                                                         *
 *  This file is part of guh.                                              *
 *                                                                         *
 *  Guh is free software: you can redistribute it and/or modify            *
 *  it under the terms of the GNU General Public License as published by   *
 *  the Free Software Foundation, version 2 of the License.                *
 *                                                                         *
 *  Guh is distributed in the hope that it will be useful,                 *
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of         *
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
 *  GNU General Public License for more details.                           *
 *                                                                         *
 *  You should have received a copy of the GNU General Public License      *
 *  along with guh. If not, see <http://www.gnu.org/licenses/>.            *
 *                                                                         *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

#include "tcpserver.h"
#include "loggingcategories.h"
#include "guhsettings.h"

#include <QDebug>
#include <QJsonDocument>

namespace guhserver {

TcpServer::TcpServer(QObject *parent) :
    QObject(parent)
{       
    // Timer for scanning network interfaces ever 5 seconds
    // Note: QNetworkConfigurationManager does not work on embedded platforms
    m_timer = new QTimer(this);
    m_timer->setInterval(5000);
    connect (m_timer, &QTimer::timeout, this, &TcpServer::onTimeout);

    // load JSON-RPC server settings
    GuhSettings settings(GuhSettings::SettingsRoleGlobal);
    qCDebug(dcConnection) << "Loading TCP server settings from:" << settings.fileName();
    settings.beginGroup("JSONRPC");

    // load port
    m_port = settings.value("port", 1234).toUInt();

    // load interfaces
    QStringList interfaceList = settings.value("interfaces", QStringList("all")).toStringList();
    if (interfaceList.contains("all")) {
        m_networkInterfaces = QNetworkInterface::allInterfaces();
    } else {
        foreach (const QNetworkInterface &interface, QNetworkInterface::allInterfaces()) {
            if (interfaceList.contains(interface.name())) {
                m_networkInterfaces.append(interface);
            }
        }
    }

    // load IP versions (IPv4, IPv6 or any)
    m_ipVersions = settings.value("ip", QStringList("any")).toStringList();
    settings.endGroup();
}

void TcpServer::sendData(const QList<QUuid> &clients, const QByteArray &data)
{
    foreach (const QUuid &client, clients) {
        sendData(client, data);
    }
}


void TcpServer::sendData(const QUuid &clientId, const QByteArray &data)
{
    QTcpSocket *client = m_clientList.value(clientId);
    if (client) {
        client->write(data);
    }
}

void TcpServer::newClientConnected()
{
    // got a new client connected
    QTcpServer *server = qobject_cast<QTcpServer*>(sender());
    QTcpSocket *newConnection = server->nextPendingConnection();
    qCDebug(dcConnection) << "new client connected:" << newConnection->peerAddress().toString();

    QUuid clientId = QUuid::createUuid();

    // append the new client to the client list
    m_clientList.insert(clientId, newConnection);

    connect(newConnection, SIGNAL(readyRead()),this,SLOT(readPackage()));
    connect(newConnection,SIGNAL(disconnected()),this,SLOT(slotClientDisconnected()));

    emit clientConnected(clientId);
}


void TcpServer::readPackage()
{
    QTcpSocket *client = qobject_cast<QTcpSocket*>(sender());
    qCDebug(dcConnection) << "data comming from" << client->peerAddress().toString();
    QByteArray message;
    while (client->canReadLine()) {
        QByteArray dataLine = client->readLine();
        qCDebug(dcConnection) << "line in:" << dataLine;
        message.append(dataLine);
        if (dataLine.endsWith('\n')) {
            emit dataAvailable(m_clientList.key(client), message);
            message.clear();
        }
    }
}

void TcpServer::slotClientDisconnected()
{
    QTcpSocket *client = qobject_cast<QTcpSocket*>(sender());
    qCDebug(dcConnection) << "client disconnected:" << client->peerAddress().toString();
    QUuid clientId = m_clientList.key(client);
    m_clientList.take(clientId)->deleteLater();
}

void TcpServer::onTimeout()
{
    //    // check all networkinterfaces
    //    bool ipV4 = m_ipVersions.contains("IPv4");
    //    bool ipV6 = m_ipVersions.contains("IPv6");
    //    if (m_ipVersions.contains("any")) {
    //        ipV4 = ipV6 = true;
    //    }

    //    QList<QHostAddress *> m_serversToCreate;
    //    QList<QTcpServer *> m_serversToDelete;

    //    // check all available interfaces
    //    foreach (const QNetworkInterface &interface, m_networkInterfaces) {
    //        QList<QNetworkAddressEntry> addresseEntries = interface.addressEntries();
    //        QList<QHostAddress> addresses;

    //        foreach (QNetworkAddressEntry entry, addresseEntries) {
    //            if (ipV4 && entry.ip().protocol() == QAbstractSocket::IPv4Protocol) {
    //                addresses.append(entry.ip());
    //            }
    //            if (ipV6 && entry.ip().protocol() == QAbstractSocket::IPv6Protocol) {
    //                addresses.append(entry.ip());
    //            }
    //        }

    //        // check each host address of this interface

    //        foreach (QTcpServer *s, m_serverList) {
    //            if (!addresses.contains(s->serverAddress()))
    //                return;




    //        }
    //    }
}

bool TcpServer::startServer()
{
    qCDebug(dcConnection) << "----------------------------";
    qCDebug(dcConnection) << "JSON-RPC server listening on:";
    qCDebug(dcConnection) << "----------------------------";

    bool ipV4 = m_ipVersions.contains("IPv4");
    bool ipV6 = m_ipVersions.contains("IPv6");
    if (m_ipVersions.contains("any")) {
        ipV4 = ipV6 = true;
    }

    foreach (const QNetworkInterface &interface, m_networkInterfaces) {
        QList<QNetworkAddressEntry> addresseEntries = interface.addressEntries();
        QList<QHostAddress> addresses;

        foreach (QNetworkAddressEntry entry, addresseEntries) {
            if (ipV4 && entry.ip().protocol() == QAbstractSocket::IPv4Protocol) {
                addresses.append(entry.ip());
            }
            if (ipV6 && entry.ip().protocol() == QAbstractSocket::IPv6Protocol) {
                addresses.append(entry.ip());
            }
        }

        foreach(const QHostAddress &address, addresses){
            QTcpServer *server = new QTcpServer(this);
            if(server->listen(address, m_port)) {
                qCDebug(dcConnection) << "\tname |" << interface.name();
                qCDebug(dcConnection) << "\tip   |" << address.toString();
                qCDebug(dcConnection) << "\tport |" << m_port;
                qCDebug(dcConnection) << "\tmac  |" << interface.hardwareAddress();
                qCDebug(dcConnection) << "\t-----+-------------------";

                connect(server, SIGNAL(newConnection()), SLOT(newClientConnected()));
                m_serverList.insert(QUuid::createUuid(), server);
            } else {
                qCWarning(dcConnection) << "ERROR: can not listen to" << interface.name() << address.toString() << m_port;
                delete server;
            }
        }
    }

    if (m_serverList.empty())
        return false;

    return true;
}

bool TcpServer::stopServer()
{
    // Listen on all Networkinterfaces
    foreach (QTcpServer *server, m_serverList) {
        qCDebug(dcConnection) << "close server " << server->serverAddress().toString();
        server->close();
        delete server;
    }

    if (!m_serverList.empty())
        return false;

    return true;
}

}