/*

  Copyright © 2015 Hasan Yavuz Özderya

  This file is part of serialplot.

  serialplot 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, either version 3 of the License, or

  (at your option) any later version.

  serialplot 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 serialplot.  If not, see <http://www.gnu.org/licenses/>.

*/

#include "mainwindow.h"

#include "ui_mainwindow.h"

#include <QByteArray>

#include <QApplication>

#include <QFileDialog>

#include <QFile>

#include <QTextStream>

#include <QtDebug>

#include <QtEndian>

#include <qwt_plot.h>

#include <limits.h>

#include <cmath>

#include <iostream>

#include "utils.h"

#include "version.h"

#include "floatswap.h"

#if defined(Q_OS_WIN) && defined(QT_STATIC)

#include <QtPlugin>

Q_IMPORT_PLUGIN(QWindowsIntegrationPlugin)

#endif

MainWindow::MainWindow(QWidget *parent) :

    QMainWindow(parent),

    ui(new Ui::MainWindow),

    portControl(&serialPort)

{

    ui->setupUi(this);

    ui->tabWidget->insertTab(0, &portControl, "Port");

    ui->tabWidget->setCurrentIndex(0);

    setupAboutDialog();

    // init UI signals

    // menu signals

    QObject::connect(ui->actionHelpAbout, &QAction::triggered,

              &aboutDialog, &QWidget::show);

    QObject::connect(ui->actionExportCsv, &QAction::triggered,

                     this, &MainWindow::onExportCsv);

    QObject::connect(ui->actionQuit, &QAction::triggered,

                     this, &MainWindow::close);

    QObject::connect(&portControl, &PortControl::portToggled,

                     this, &MainWindow::onPortToggled);

    QObject::connect(&portControl, &PortControl::skipByteRequested,

                     this, &MainWindow::skipByte);

    QObject::connect(ui->spNumOfSamples, SELECT<int>::OVERLOAD_OF(&QSpinBox::valueChanged),

                     this, &MainWindow::onNumOfSamplesChanged);

    QObject::connect(ui->cbAutoScale, &QCheckBox::toggled,

                     this, &MainWindow::onAutoScaleChecked);

    QObject::connect(ui->spYmin, SIGNAL(valueChanged(double)),

                     this, SLOT(onYScaleChanged()));

    QObject::connect(ui->spYmax, SIGNAL(valueChanged(double)),

                     this, SLOT(onYScaleChanged()));

    QObject::connect(ui->actionClear, SIGNAL(triggered(bool)),

                     this, SLOT(clearPlot()));

    // setup number of channels spinbox

    QObject::connect(ui->spNumOfChannels,

                     SELECT<int>::OVERLOAD_OF(&QSpinBox::valueChanged),

                     this, &MainWindow::onNumOfChannelsChanged);

    // setup number format buttons

    numberFormatButtons.addButton(ui->rbUint8,  NumberFormat_uint8);

    numberFormatButtons.addButton(ui->rbUint16, NumberFormat_uint16);

    numberFormatButtons.addButton(ui->rbUint32, NumberFormat_uint32);

    numberFormatButtons.addButton(ui->rbInt8,   NumberFormat_int8);

    numberFormatButtons.addButton(ui->rbInt16,  NumberFormat_int16);

    numberFormatButtons.addButton(ui->rbInt32,  NumberFormat_int32);

    numberFormatButtons.addButton(ui->rbFloat,  NumberFormat_float);

    numberFormatButtons.addButton(ui->rbASCII,  NumberFormat_ASCII);

    QObject::connect(&numberFormatButtons, SIGNAL(buttonToggled(int, bool)),

                     this, SLOT(onNumberFormatButtonToggled(int, bool)));

    // init port signals

    QObject::connect(&(this->serialPort), SIGNAL(error(QSerialPort::SerialPortError)),

                     this, SLOT(onPortError(QSerialPort::SerialPortError)));

    // set limits for axis limit boxes

    ui->spYmin->setRange((-1) * std::numeric_limits<double>::max(),

                         std::numeric_limits<double>::max());

    ui->spYmax->setRange((-1) * std::numeric_limits<double>::max(),

                         std::numeric_limits<double>::max());

    // init data arrays and plot

    numOfSamples = ui->spNumOfSamples->value();

    numOfChannels = 1;

    dataX.resize(numOfSamples);

    for (int i = 0; i < dataX.size(); i++)

    {

        dataX[i] = i;

    }

    // init channel data and curve list

    for (unsigned int i = 0; i < numOfChannels; i++)

    {

        channelsData.append(DataArray(numOfSamples, 0.0));

        curves.append(new QwtPlotCurve());

        curves[i]->setSamples(dataX, channelsData[i]);

        curves[i]->setPen(makeColor(i));

        curves[i]->attach(ui->plot);

    }

    // init number format

    if (numberFormatButtons.checkedId() >= 0)

    {

        selectNumberFormat((NumberFormat) numberFormatButtons.checkedId());

    }

    else

    {

        selectNumberFormat(NumberFormat_uint8);

    }

    // Init sps (sample per second) counter

    sampleCount = 0;

    spsLabel.setText("0sps");

    ui->statusBar->addPermanentWidget(&spsLabel);

    spsTimer.start(SPS_UPDATE_TIMEOUT * 1000);

    QObject::connect(&spsTimer, &QTimer::timeout,

                     this, &MainWindow::spsTimerTimeout);

    // Init demo mode

    demoCount = 0;

    demoTimer.setInterval(100);

    QObject::connect(&demoTimer, &QTimer::timeout,

                     this, &MainWindow::demoTimerTimeout);

    QObject::connect(ui->actionDemoMode, &QAction::toggled,

                     this, &MainWindow::enableDemo);

    {   // init demo indicator

        QwtText demoText(" DEMO RUNNING ");  // looks better with spaces

        demoText.setColor(QColor("white"));

        demoText.setBackgroundBrush(Qt::darkRed);

        demoText.setBorderRadius(4);

        demoText.setRenderFlags(Qt::AlignLeft | Qt::AlignTop);

        demoIndicator.setText(demoText);

        demoIndicator.hide();

        demoIndicator.attach(ui->plot);

    }

}

MainWindow::~MainWindow()

{

    for (auto curve : curves)

    {

        delete curve;

    }

    if (serialPort.isOpen())

    {

        serialPort.close();

    }

    delete ui;

}

void MainWindow::setupAboutDialog()

{

    Ui_AboutDialog uiAboutDialog;

    uiAboutDialog.setupUi(&aboutDialog);

    QObject::connect(uiAboutDialog.pbAboutQt, &QPushButton::clicked,

                     [](){ QApplication::aboutQt();});

    QString aboutText = uiAboutDialog.lbAbout->text();

    aboutText.replace("$VERSION_STRING$", VERSION_STRING);

    aboutText.replace("$VERSION_REVISION$", VERSION_REVISION);

    uiAboutDialog.lbAbout->setText(aboutText);

}

void MainWindow::onPortToggled(bool open)

{

    // make sure demo mode is disabled

    if (open && isDemoRunning()) enableDemo(false);

    ui->actionDemoMode->setEnabled(!open);

}

void MainWindow::onDataReady()

{

    if (!ui->actionPause->isChecked())

    {

        // a package is a set of channel data like {CHAN0_SAMPLE, CHAN1_SAMPLE...}

        int packageSize = sampleSize * numOfChannels;

        int bytesAvailable = serialPort.bytesAvailable();

        if (bytesAvailable > 0 && skipByteRequested)

        {

            serialPort.read(1);

            skipByteRequested = false;

            bytesAvailable--;

        }

        if (bytesAvailable < packageSize)

        {

            return;

        }

        else

        {

            int numOfPackagesToRead =

                (bytesAvailable - (bytesAvailable % packageSize)) / packageSize;

            QVector<DataArray> channelSamples(numOfChannels);

            for (unsigned int ci = 0; ci < numOfChannels; ci++)

            {

                channelSamples[ci].resize(numOfPackagesToRead);

            }

            int i = 0;

            while(i < numOfPackagesToRead)

            {

                for (unsigned int ci = 0; ci < numOfChannels; ci++)

                {

                    channelSamples[ci].replace(i, (this->*readSample)());

                }

                i++;

            }

            for (unsigned int ci = 0; ci < numOfChannels; ci++)

            {

                addChannelData(ci, channelSamples[ci]);

            }

        }

    }

    else

    {

        serialPort.clear(QSerialPort::Input);

    }

}

void MainWindow::onDataReadyASCII()

{

    while(serialPort.canReadLine())

    {

        QByteArray line = serialPort.readLine();

        // discard data if paused

        if (ui->actionPause->isChecked())

        {

            return;

        }

        line = line.trimmed();

        auto separatedValues = line.split(',');

        if (separatedValues.length() >= int(numOfChannels))

        {

            for (unsigned int ci = 0; ci < numOfChannels; ci++)

            {

                double channelSample = separatedValues[ci].toDouble();

                addChannelData(ci, DataArray({channelSample}));

            }

        }

        else // there is missing channel data

        {

            qWarning() << "Incoming data is missing data for some channels!";

            for (int ci = 0; ci < separatedValues.length(); ci++)

            {

                double channelSample = separatedValues[ci].toDouble();

                addChannelData(ci, DataArray({channelSample}));

            }

        }

    }

}

void MainWindow::onPortError(QSerialPort::SerialPortError error)

{

    switch(error)

    {

        case QSerialPort::NoError :

            break;

        case QSerialPort::ResourceError :

            qWarning() << "Port error: resource unavaliable; most likely device removed.";

            if (serialPort.isOpen())

            {

                qWarning() << "Closing port on resource error: " << serialPort.portName();

                portControl.togglePort();

            }

            portControl.loadPortList();

            break;

        case QSerialPort::DeviceNotFoundError:

            qCritical() << "Device doesn't exists: " << serialPort.portName();

            break;

        case QSerialPort::PermissionError:

            qCritical() << "Permission denied. Either you don't have \

required privileges or device is already opened by another process.";

            break;

        case QSerialPort::OpenError:

            qWarning() << "Device is already opened!";

            break;

        case QSerialPort::NotOpenError:

            qCritical() << "Device is not open!";

            break;

        case QSerialPort::ParityError:

            qCritical() << "Parity error detected.";

            break;

        case QSerialPort::FramingError:

            qCritical() << "Framing error detected.";

            break;

        case QSerialPort::BreakConditionError:

            qCritical() << "Break condition is detected.";

            break;

        case QSerialPort::WriteError:

            qCritical() << "An error occurred while writing data.";

            break;

        case QSerialPort::ReadError:

            qCritical() << "An error occurred while reading data.";

            break;

        case QSerialPort::UnsupportedOperationError:

            qCritical() << "Operation is not supported.";