/*

  Copyright © 2017 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 <QMessageBox>

#include <QFile>

#include <QTextStream>

#include <QMenu>

#include <QDesktopServices>

#include <QMap>

#include <QtDebug>

#include <qwt_plot.h>

#include <limits.h>

#include <cmath>

#include <iostream>

#include <plot.h>

#include "framebufferseries.h"

#include "utils.h"

#include "defines.h"

#include "version.h"

#include "setting_defines.h"

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

#include <QtPlugin>

Q_IMPORT_PLUGIN(QWindowsIntegrationPlugin)

#endif

const QMap<int, QString> panelSettingMap({

        {0, "Port"},

        {1, "DataFormat"},

        {2, "Plot"},

        {3, "Commands"}

    });

MainWindow::MainWindow(QWidget *parent) :

    QMainWindow(parent),

    ui(new Ui::MainWindow),

    aboutDialog(this),

    portControl(&serialPort),

    channelMan(1, 1, this),

    snapshotMan(this, &channelMan),

    commandPanel(&serialPort),

    dataFormatPanel(&serialPort, &channelMan, &recorder),

    recordPanel(&recorder, &channelMan)

{

    ui->setupUi(this);

    plotMan = new PlotManager(ui->plotArea, channelMan.infoModel());

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

    ui->tabWidget->insertTab(1, &dataFormatPanel, "Data Format");

    ui->tabWidget->insertTab(2, &plotControlPanel, "Plot");

    ui->tabWidget->insertTab(3, &commandPanel, "Commands");

    ui->tabWidget->insertTab(4, &recordPanel, "Record");

    ui->tabWidget->setCurrentIndex(0);

    auto tbPortControl = portControl.toolBar();

    addToolBar(tbPortControl);

    addToolBar(recordPanel.toolbar());

    ui->plotToolBar->addAction(snapshotMan.takeSnapshotAction());

    ui->menuBar->insertMenu(ui->menuHelp->menuAction(), snapshotMan.menu());

    ui->menuBar->insertMenu(ui->menuHelp->menuAction(), commandPanel.menu());

    connect(&commandPanel, &CommandPanel::focusRequested, [this]()

            {

                this->ui->tabWidget->setCurrentWidget(&commandPanel);

            });

    tbPortControl->setObjectName("tbPortControl");

    ui->plotToolBar->setObjectName("tbPlot");

    setupAboutDialog();

    // init view menu

    for (auto a : plotMan->menuActions())

    {

        ui->menuView->addAction(a);

    }

    ui->menuView->addSeparator();

    QMenu* tbMenu = ui->menuView->addMenu("Toolbars");

    tbMenu->addAction(ui->plotToolBar->toggleViewAction());

    tbMenu->addAction(portControl.toolBar()->toggleViewAction());

    // init UI signals

    // Help menu signals

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

              &aboutDialog, &QWidget::show);

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

                     [](){QDesktopServices::openUrl(QUrl(BUG_REPORT_URL));});

    // File menu signals

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

                     this, &MainWindow::onExportCsv);

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

                     this, &MainWindow::onSaveSettings);

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

                     this, &MainWindow::onLoadSettings);

    ui->actionQuit->setShortcutContext(Qt::ApplicationShortcut);

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

                     this, &MainWindow::close);

    // port control signals

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

                     this, &MainWindow::onPortToggled);

    connect(&plotControlPanel, &PlotControlPanel::numOfSamplesChanged,

            this, &MainWindow::onNumOfSamplesChanged);

    connect(&plotControlPanel, &PlotControlPanel::numOfSamplesChanged,

            plotMan, &PlotManager::onNumOfSamplesChanged);

    connect(&plotControlPanel, &PlotControlPanel::scaleChanged,

            plotMan, &PlotManager::setAxis);

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

                     this, SLOT(clearPlot()));

    QObject::connect(snapshotMan.takeSnapshotAction(), &QAction::triggered,

                     plotMan, &PlotManager::flashSnapshotOverlay);

    // init port signals

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

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

    // init data format and reader

    QObject::connect(&channelMan, &ChannelManager::dataAdded,

                     plotMan, &PlotManager::replot);

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

                     &channelMan, &ChannelManager::pause);

    QObject::connect(&recordPanel, &RecordPanel::recordStarted,

                     &dataFormatPanel, &DataFormatPanel::startRecording);

    QObject::connect(&recordPanel, &RecordPanel::recordStopped,

                     &dataFormatPanel, &DataFormatPanel::stopRecording);

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

                     [this](bool enabled)

                     {

                         if (enabled && !recordPanel.recordPaused())

                         {

                             dataFormatPanel.pause(true);

                         }

                         else

                         {

                             dataFormatPanel.pause(false);

                         }

                     });

    QObject::connect(&recordPanel, &RecordPanel::recordPausedChanged,

                     [this](bool enabled)

                     {

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

                         {

                             dataFormatPanel.pause(false);

                         }

                     });

    connect(&serialPort, &QIODevice::aboutToClose,

            &recordPanel, &RecordPanel::onPortClose);

    // init data arrays and plot

    numOfSamples = plotControlPanel.numOfSamples();

    unsigned numOfChannels = dataFormatPanel.numOfChannels();

    channelMan.setNumOfSamples(numOfSamples);

    channelMan.setNumOfChannels(dataFormatPanel.numOfChannels());

    connect(&dataFormatPanel, &DataFormatPanel::numOfChannelsChanged,

            &channelMan, &ChannelManager::setNumOfChannels);

    connect(&channelMan, &ChannelManager::numOfChannelsChanged,

            this, &MainWindow::onNumOfChannelsChanged);

    plotControlPanel.setChannelInfoModel(channelMan.infoModel());

    // init curve list

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

    {

        plotMan->addCurve(channelMan.channelName(i), channelMan.channelBuffer(i));

    }

    // init auto scale

    plotMan->setAxis(plotControlPanel.autoScale(),

                     plotControlPanel.yMin(), plotControlPanel.yMax());

    // Init sps (sample per second) counter

    spsLabel.setText("0sps");

    spsLabel.setToolTip("samples per second (per channel)");

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

    QObject::connect(&dataFormatPanel,

                     &DataFormatPanel::samplesPerSecondChanged,

                     this, &MainWindow::onSpsChanged);

    // init demo

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

                     this, &MainWindow::enableDemo);

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

                     plotMan, &PlotManager::showDemoIndicator);

    // load default settings

    QSettings settings("serialplot", "serialplot");

    loadAllSettings(&settings);

    // ensure command panel has 1 command if none loaded

    if (!commandPanel.numOfCommands())

    {

        commandPanel.newCommandAction()->trigger();

    }

    // Important: This should be after newCommandAction is triggered

    // (above) we don't want user to be greeted with command panel on

    // the very first run.

    connect(commandPanel.newCommandAction(), &QAction::triggered, [this]()

            {

                this->ui->tabWidget->setCurrentWidget(&commandPanel);

            });

}

MainWindow::~MainWindow()

{

    if (serialPort.isOpen())

    {

        serialPort.close();

    }

    delete plotMan;

    delete ui;

    ui = NULL; // we check if ui is deleted in messageHandler

}

void MainWindow::closeEvent(QCloseEvent * event)

{

    if (!snapshotMan.isAllSaved())

    {

        auto clickedButton = QMessageBox::warning(

            this, "Closing SerialPlot",

            "There are un-saved snapshots. If you close you will loose the data.",

            QMessageBox::Discard | QMessageBox::Discard,

            QMessageBox::Cancel);

        if (clickedButton == QMessageBox::Cancel)

        {

            event->ignore();

            return;

        }

    }

    QMainWindow::closeEvent(event);

}

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::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.";

            break;

        case QSerialPort::TimeoutError:

            qCritical() << "A timeout error occurred.";

            break;

        case QSerialPort::UnknownError:

            qCritical() << "Unknown error! Error: " << serialPort.errorString();

            break;

        default:

            qCritical() << "Unhandled port error: " << error;

            break;

    }

}

void MainWindow::clearPlot()

{

    for (unsigned ci = 0; ci < channelMan.numOfChannels(); ci++)

    {

        channelMan.channelBuffer(ci)->clear();

    }

    plotMan->replot();

}

void MainWindow::onNumOfSamplesChanged(int value)

{

    numOfSamples = value;

    channelMan.setNumOfSamples(value);

    plotMan->replot();

}

void MainWindow::onNumOfChannelsChanged(unsigned value)

{

    unsigned int oldNum = plotMan->numOfCurves();

    unsigned numOfChannels = value;

    if (numOfChannels > oldNum)

    {

        // add new channels

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

        {

            plotMan->addCurve(channelMan.channelName(i), channelMan.channelBuffer(i));

        }

    }

    else if(numOfChannels < oldNum)

    {

        plotMan->removeCurves(oldNum - numOfChannels);

    }

    plotMan->replot();

}

void MainWindow::onSpsChanged(unsigned sps)

{

    spsLabel.setText(QString::number(sps) + "sps");

}

bool MainWindow::isDemoRunning()

{

    return ui->actionDemoMode->isChecked();

}

void MainWindow::enableDemo(bool enabled)

{

    if (enabled)

    {

        if (!serialPort.isOpen())

        {

            dataFormatPanel.enableDemo(true);

        }

        else

        {

            ui->actionDemoMode->setChecked(false);

        }

    }

    else

    {

        dataFormatPanel.enableDemo(false);

        ui->actionDemoMode->setChecked(false);

    }

}

void MainWindow::onExportCsv()

{

    bool wasPaused = ui->actionPause->isChecked();

    ui->actionPause->setChecked(true); // pause plotting

    QString fileName = QFileDialog::getSaveFileName(this, tr("Export CSV File"));

    if (fileName.isNull())  // user canceled export

    {

        ui->actionPause->setChecked(wasPaused);

    }

    else

    {

        Snapshot* snapshot = snapshotMan.makeSnapshot();

        snapshot->save(fileName);

        delete snapshot;

    }

}

void MainWindow::messageHandler(QtMsgType type,

                                const QMessageLogContext &context,

                                const QString &msg)

{

    QString logString;

    switch (type)

    {

#if (QT_VERSION >= QT_VERSION_CHECK(5, 5, 0))

        case QtInfoMsg:

            logString = "[Info] " + msg;

            break;

#endif

        case QtDebugMsg:

            logString = "[Debug] " + msg;

            break;

        case QtWarningMsg:

            logString = "[Warning] " + msg;

            break;

        case QtCriticalMsg:

            logString = "[Error] " + msg;

            break;

        case QtFatalMsg:

            logString = "[Fatal] " + msg;

            break;

    }

    if (ui != NULL) ui->ptLog->appendPlainText(logString);

    std::cerr << logString.toStdString() << std::endl;

    if (type != QtDebugMsg && ui != NULL)

    {

        ui->statusBar->showMessage(msg, 5000);

    }

    if (type == QtFatalMsg)

    {

        __builtin_trap();

    }

}

void MainWindow::saveAllSettings(QSettings* settings)

{

    saveMWSettings(settings);

    portControl.saveSettings(settings);

    dataFormatPanel.saveSettings(settings);

    channelMan.saveSettings(settings);

    plotControlPanel.saveSettings(settings);

    plotMan->saveSettings(settings);

    commandPanel.saveSettings(settings);

    recordPanel.saveSettings(settings);

}

void MainWindow::loadAllSettings(QSettings* settings)

{

    loadMWSettings(settings);

    portControl.loadSettings(settings);

    dataFormatPanel.loadSettings(settings);

    channelMan.loadSettings(settings);

    plotControlPanel.loadSettings(settings);

    plotMan->loadSettings(settings);

    commandPanel.loadSettings(settings);

    recordPanel.loadSettings(settings);

}

void MainWindow::saveMWSettings(QSettings* settings)

{

    // save window geometry

    settings->beginGroup(SettingGroup_MainWindow);

    settings->setValue(SG_MainWindow_Size, size());

    settings->setValue(SG_MainWindow_Pos, pos());

    // save active panel

    settings->setValue(SG_MainWindow_ActivePanel,

                       panelSettingMap.value(ui->tabWidget->currentIndex()));

    // save panel minimization

    settings->setValue(SG_MainWindow_HidePanels,

                       ui->tabWidget->hideAction.isChecked());

    // save window maximized state

    settings->setValue(SG_MainWindow_Maximized,

                       bool(windowState() & Qt::WindowMaximized));

    // save toolbar/dockwidgets state

    settings->setValue(SG_MainWindow_State, saveState());

    settings->endGroup();

}

void MainWindow::loadMWSettings(QSettings* settings)

{

    settings->beginGroup(SettingGroup_MainWindow);

    // load window geometry

    resize(settings->value(SG_MainWindow_Size, size()).toSize());

    move(settings->value(SG_MainWindow_Pos, pos()).toPoint());

    // set active panel

    QString tabSetting =

        settings->value(SG_MainWindow_ActivePanel, QString()).toString();

    ui->tabWidget->setCurrentIndex(

        panelSettingMap.key(tabSetting, ui->tabWidget->currentIndex()));

    // hide panels

    ui->tabWidget->hideAction.setChecked(

        settings->value(SG_MainWindow_HidePanels,

                        ui->tabWidget->hideAction.isChecked()).toBool());

    // maximize window

    if (settings->value(SG_MainWindow_Maximized).toBool())

    {

        showMaximized();

    }

    // load toolbar/dockwidgets state

    restoreState(settings->value(SG_MainWindow_State).toByteArray());

    settings->setValue(SG_MainWindow_State, saveState());

    settings->endGroup();

}

void MainWindow::onSaveSettings()

{

    QString fileName = QFileDialog::getSaveFileName(

        this, tr("Save Settings"), QString(), "INI (*.ini)");

    if (!fileName.isNull()) // user canceled

    {

        QSettings settings(fileName, QSettings::IniFormat);

        saveAllSettings(&settings);

    }

}

void MainWindow::onLoadSettings()

{

    QString fileName = QFileDialog::getOpenFileName(

        this, tr("Load Settings"), QString(), "INI (*.ini)");

    if (!fileName.isNull()) // user canceled

    {

        QSettings settings(fileName, QSettings::IniFormat);

        loadAllSettings(&settings);

    }

}