/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 *                                                                         *
 *  Copyright (C) 2015 Simon Stuerz <simon.stuerz@guh.guru>                *
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 *  This file is part of guh.                                              *
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 *  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.                *
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 *  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.                           *
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 *  You should have received a copy of the GNU General Public License      *
 *  along with guh. If not, see <http://www.gnu.org/licenses/>.            *
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/*!
    \page udpcommander.html
    \title UDP Commander

    \ingroup plugins
    \ingroup network

    This plugin allows to receive UDP packages over a certain UDP port and generates an \l{Event} if the message content matches
    the \l{Param} command.

    \note This plugin is ment to be cominend with a \l{Rule}.

    \section3 Example

    If you create an UDP Commander on port 2323 and with the command \c{"Light 1 ON"}, following command will trigger an \l{Event} in guh
    and allows you to connect this \l{Event} with a \l{Rule}.

    \note In this example guh is running on \c localhost

    \code
    $ echo "Light 1 ON" | nc -u localhost 2323
    OK
    \endcode

    This allows you to execute \l{Action}{Actions} in your home automation system when a certain UDP message will be sent to guh.

    If the command will be recognized from guh, the sender will receive as answere a \c{"OK"} string.

    \chapter Plugin properties
    Following JSON file contains the definition and the description of all available \l{DeviceClass}{DeviceClasses}
    and \l{Vendor}{Vendors} of this \l{DevicePlugin}.

    Each \l{DeviceClass} has a list of \l{ParamType}{paramTypes}, \l{ActionType}{actionTypes}, \l{StateType}{stateTypes}
    and \l{EventType}{eventTypes}. The \l{DeviceClass::CreateMethod}{createMethods} parameter describes how the \l{Device}
    will be created in the system. A device can have more than one \l{DeviceClass::CreateMethod}{CreateMethod}.
    The \l{DeviceClass::SetupMethod}{setupMethod} describes the setup method of the \l{Device}.
    The detailed implementation of each \l{DeviceClass} can be found in the source code.

    \note If a \l{StateType} has the parameter \tt{"writable": true}, an \l{ActionType} with the same uuid and \l{ParamType}{ParamTypes}
    will be created automatically.

    \quotefile plugins/deviceplugins/udpcommander/devicepluginudpcommander.json
*/

#include "devicepluginudpcommander.h"
#include "plugin/device.h"
#include "plugininfo.h"

DevicePluginUdpCommander::DevicePluginUdpCommander()
{

}

DeviceManager::HardwareResources DevicePluginUdpCommander::requiredHardware() const
{
    return DeviceManager::HardwareResourceNone;
}

DeviceManager::DeviceSetupStatus DevicePluginUdpCommander::setupDevice(Device *device)
{
    // check port
    bool portOk = false;
    int port = device->paramValue("port").toInt(&portOk);
    if (!portOk || port <= 0 || port > 65535) {
        qWarning() << "ERROR: UDP commander" << device->paramValue("name") << ": invalid port:" << device->paramValue("port").toString() << ".";
        return DeviceManager::DeviceSetupStatusFailure;
    }

    QUdpSocket *udpSocket = new QUdpSocket(this);

    if (!udpSocket->bind(QHostAddress::Any, port)) {
        qWarning() << "ERROR: UDP commander" << device->paramValue("name") << "can't bind to port" << port << ".";
        delete udpSocket;
        return DeviceManager::DeviceSetupStatusFailure;
    }

    connect(udpSocket, SIGNAL(readyRead()), this, SLOT(readPendingDatagrams()));
    m_commanderList.insert(udpSocket, device);

    return DeviceManager::DeviceSetupStatusSuccess;
}

void DevicePluginUdpCommander::deviceRemoved(Device *device)
{
    QUdpSocket *socket = m_commanderList.key(device);
    m_commanderList.remove(socket);

    socket->close();
    socket->deleteLater();
}

void DevicePluginUdpCommander::readPendingDatagrams()
{
    QUdpSocket *socket= qobject_cast<QUdpSocket*>(sender());
    Device *device = m_commanderList.value(socket);

    QByteArray datagram;
    QHostAddress sender;
    quint16 senderPort;

    while (socket->hasPendingDatagrams()) {
        datagram.resize(socket->pendingDatagramSize());
        socket->readDatagram(datagram.data(), datagram.size(), &sender, &senderPort);
    }

    if (datagram == device->paramValue("command").toByteArray() ||
            datagram == device->paramValue("command").toByteArray() + "\n") {
        qDebug() << device->paramValue("name").toString() << " got command from" << sender.toString() << senderPort;
        emit emitEvent(Event(commandReceivedEventTypeId, device->id()));
        socket->writeDatagram("OK\n", sender, senderPort);
    }
}