/*!
 *
 * Copyright (c) 2019-2019 Diality Inc. - All Rights Reserved.
 * copyright
 *          THIS CODE MAY NOT BE COPIED OR REPRODUCED IN ANY FORM,
 *          IN PART OR IN WHOLE,
 *          WITHOUT THE EXPLICIT PERMISSION OF THE COPYRIGHT OWNER.
 *
 * file    messagepacker.cpp
 * date    12/9/2019
 * author  Behrouz NematiPour
 *
 */
#include "messagedispatcher.h"

// Qt
#include <QThread>
#include <QApplication>

// Project
#include "logger.h"
#include "applicationcontroller.h"
#include "frameinterface.h"

using namespace Can;

/*!
 * \brief MessageDispatcher Constructor
 * \param parent
 */
MessageDispatcher::MessageDispatcher(QObject *parent) : QObject(parent) { }

/*!
 * \brief Message Handler initializer
 */
bool MessageDispatcher::init()
{
    if ( _init ) return false;
    _init = true;

    // runs in USBWatcher thread
    initConnections();

    LOG_EVENT(QObject::tr("%1 Initialized").arg(metaObject()->className()));

    return true;
}

/*!
 * \brief   MessageDispatcher::init
 * \details Initialized the Class by calling the init() method first
 *          And initializes the thread vThread by calling initThread
 *          on success init().
 * \param   vThread - the thread
 * \return  returns the return value of the init() method
 */
bool MessageDispatcher::init(QThread &vThread)
{
    if ( ! init() ) return false;
    initThread(vThread);
    return true;
}

/*!
 * \brief   MessageDispatcher::quit
 * \details quits the class
 *          Calls quitThread
 */
void MessageDispatcher::quit()
{
    quitThread();
}

/*!
 * \brief Message Handler connections definition
 * \details Initializes the required signal/slot connection between this class and other objects
 *          to be able to communicate.
 */
void MessageDispatcher::initConnections()
{
    // From GUI
    connect(&_ApplicationController, SIGNAL(didActionTransmit(GuiActionType, const QVariantList &)),
            this                   ,   SLOT( onActionTransmit(GuiActionType, const QVariantList &)));

    // From HD
    connect(&_FrameInterface       , SIGNAL(didFrameReceive  (       Can_Id, const QByteArray   &)),
            this                   ,   SLOT( onFrameReceive  (       Can_Id, const QByteArray   &)));
}

/*!
 * \brief   ApplicationController::initThread
 * \details Moves this object into the thread vThread.
 *          And checks that this method is called from main thread.
 *          Also connects quitThread to application aboutToQuit.
 * \param   vThread - the thread
 */
void MessageDispatcher::initThread(QThread &vThread)
{
    // runs in main thread
    Q_ASSERT_X(QThread::currentThread() == qApp->thread() , __func__, "The Class initialization must be done in Main Thread" );
    _thread = &vThread;
    _thread->setObjectName(QString("%1_Thread").arg(metaObject()->className()));
    connect(qApp, SIGNAL(aboutToQuit()), this, SLOT(quit()));
    _thread->start();
    moveToThread(_thread);
}

/*!
 * \brief   MessageDispatcher::quitThread
 * \details Moves this object to main thread to be handled by QApplicaiton
 *          And to be destroyed there.
 */
void MessageDispatcher::quitThread()
{
    if ( ! _thread ) return;

    // runs in thread
    moveToThread(qApp->thread());
}

/*!
 * \brief   MessageDispatcher::onFrameReceive
 * \details Upon message has been received over CANBUS this slot will be called
 *          by FrameInterface::didFrameReceive signal to process the frame
 *          Upon completion of collected all the required frames
 *          on successful interpretation of the message, emits didActionReceived signal.
 *          The message will be removed from list of the channel vCan_Id messages.
 * \param   vCanId    - CANBUS channel of the frame
 * \param   vPayload  - Payload of the frame
 */
void MessageDispatcher::onFrameReceive(Can_Id vCanId, const QByteArray &vPayload)
{
    // Append a message to the list
    if (_messageList[vCanId].isEmpty() || _messageList[vCanId].last().isComplete()) {
        _messageList[vCanId].append(Message());
        //qDebug() << tr("Created a message for channel %1#%2").arg(vCanId).arg(Format::toHexString(vPayload));
    } /*else {
        qDebug() << tr("Data for  message  on channel %1#%2").arg(vCanId).arg(Format::toHexString(vPayload));
    }*/
    //for (int i = 0; i < _messageList[vCanId].count(); ++i) {
    //    qDebug() << _messageList[vCanId][i].data.toHex('.');
    //}
    // build the message
    if (! _builder.buildMessage(vPayload, _messageList[vCanId].last(), vCanId)) {
        _messageList[vCanId].removeLast();
        return;
    }
    Message mMessage = _messageList[vCanId].last();

    // TODO : must be moved to a MessageModel class
    if (mMessage.isComplete()) {
        GuiActionType mActionId;
        QVariantList  mData;
        if (_interpreter.interpretMessage(vCanId, mMessage, mActionId, mData)) {
            emit didActionReceive(mActionId, mData);
        }
        _messageList[vCanId].removeLast();
    }
}

/*!
 * \brief   MessageDispatcher::onActionTransmit
 * \details This slot will be called by ApplicationController::didActionTransmit
 *          upon UI message transmit request and calls MessageDispatcher::actionTransmit method.
 * \param   vActionId - The ActionID of the message
 * \param   vData     - The data of the Message
 */
void MessageDispatcher::onActionTransmit(GuiActionType vActionId, const QVariantList &vData)
{
    actionTransmit(vActionId, vData);
}

/*!
 * \brief   MessageDispatcher::actionTransmit
 * \details This method is called by slot MessageDispatcher::onActionTransmit
 *          which emits didFrameTransmit on successful interpretation of the requested message
 *          and successfully creating of frame(s).
 * \param   vActionId - The ActionID of the message
 * \param   vData     - The data of the Message
 */
void MessageDispatcher::actionTransmit(GuiActionType vActionId, const QVariantList &vData)
{
    QByteArray mData;
    if (! _interpreter.interpretMessage(vActionId, vData, mData)) {
        LOG_ERROR(tr("Incorrect Message, can't be interpreted"));
        return;
    }

    FrameList frameList;
    if ( ! _builder.buildFrames(vActionId, mData, frameList) ) {
        LOG_ERROR(tr("Incorrect Message can't be built"));
        return;
    }
    for (const auto &frame : frameList) {
        emit didFrameTransmit(eChlid_UI, frame);
    }
}