/*

  Copyright © 2016 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 "portcontrol.h"

#include "ui_portcontrol.h"

#include <QSerialPortInfo>

#include <QKeySequence>

#include <QLabel>

#include <QtDebug>

#include "utils.h"

#define TBPORTLIST_MINWIDTH (200)

PortControl::PortControl(QSerialPort* port, QWidget* parent) :

    QWidget(parent),

    ui(new Ui::PortControl),

    portToolBar("Port Toolbar"),

    openAction("Open", this),

    loadPortListAction("↺", this)

{

    ui->setupUi(this);

    serialPort = port;

    // setup actions

    openAction.setCheckable(true);

    openAction.setShortcut(QKeySequence("F12"));

    openAction.setToolTip("Open Port");

    QObject::connect(&openAction, &QAction::triggered,

                     this, &PortControl::openActionTriggered);

    loadPortListAction.setToolTip("Reload port list");

    QObject::connect(&loadPortListAction, &QAction::triggered,

                     [this](bool checked){loadPortList();});

    // setup toolbar

    portToolBar.addWidget(&tbPortList);

    portToolBar.addAction(&loadPortListAction);

    portToolBar.addAction(&openAction);

    // setup port selection widgets

    tbPortList.setMinimumWidth(TBPORTLIST_MINWIDTH);

    tbPortList.setModel(&portList);

    ui->cbPortList->setModel(&portList);

    QObject::connect(ui->cbPortList,

                     SELECT<int>::OVERLOAD_OF(&QComboBox::activated),

                     this, &PortControl::onCbPortListActivated);

    QObject::connect(&tbPortList,

                     SELECT<int>::OVERLOAD_OF(&QComboBox::activated),

                     this, &PortControl::onTbPortListActivated);

    QObject::connect(ui->cbPortList,

                     SELECT<const QString&>::OVERLOAD_OF(&QComboBox::activated),

                     this, &PortControl::selectPort);

    QObject::connect(&tbPortList,

                     SELECT<const QString&>::OVERLOAD_OF(&QComboBox::activated),

                     this, &PortControl::selectPort);

    // setup buttons

    ui->pbOpenPort->setDefaultAction(&openAction);

    ui->pbReloadPorts->setDefaultAction(&loadPortListAction);

    // setup baud rate selection widget

    QObject::connect(ui->cbBaudRate,

                     SELECT<const QString&>::OVERLOAD_OF(&QComboBox::activated),

                     this, &PortControl::selectBaudRate);

    // setup parity selection buttons

    parityButtons.addButton(ui->rbNoParity, (int) QSerialPort::NoParity);

    parityButtons.addButton(ui->rbEvenParity, (int) QSerialPort::EvenParity);

    parityButtons.addButton(ui->rbOddParity, (int) QSerialPort::OddParity);

    QObject::connect(&parityButtons,

                     SELECT<int>::OVERLOAD_OF(&QButtonGroup::buttonClicked),

                     this, &PortControl::selectParity);

    // setup data bits selection buttons

    dataBitsButtons.addButton(ui->rb8Bits, (int) QSerialPort::Data8);

    dataBitsButtons.addButton(ui->rb7Bits, (int) QSerialPort::Data7);

    dataBitsButtons.addButton(ui->rb6Bits, (int) QSerialPort::Data6);

    dataBitsButtons.addButton(ui->rb5Bits, (int) QSerialPort::Data5);

    QObject::connect(&dataBitsButtons,

                     SELECT<int>::OVERLOAD_OF(&QButtonGroup::buttonClicked),

                     this, &PortControl::selectDataBits);

    // setup stop bits selection buttons

    stopBitsButtons.addButton(ui->rb1StopBit, (int) QSerialPort::OneStop);

    stopBitsButtons.addButton(ui->rb2StopBit, (int) QSerialPort::TwoStop);

    QObject::connect(&stopBitsButtons,

                     SELECT<int>::OVERLOAD_OF(&QButtonGroup::buttonClicked),

                     this, &PortControl::selectStopBits);

    // setup flow control selection buttons

    flowControlButtons.addButton(ui->rbNoFlowControl,

                                 (int) QSerialPort::NoFlowControl);

    flowControlButtons.addButton(ui->rbHardwareControl,

                                 (int) QSerialPort::HardwareControl);

    flowControlButtons.addButton(ui->rbSoftwareControl,

                                 (int) QSerialPort::SoftwareControl);

    QObject::connect(&flowControlButtons,

                     SELECT<int>::OVERLOAD_OF(&QButtonGroup::buttonClicked),

                     this, &PortControl::selectFlowControl);

    loadPortList();

    loadBaudRateList();

    ui->cbBaudRate->setCurrentIndex(ui->cbBaudRate->findText("9600"));

}

PortControl::~PortControl()

{

    delete ui;

}

void PortControl::loadPortList()

{

    QString currentSelection = ui->cbPortList->currentData(PortNameRole).toString();

    portList.loadPortList();

    int index = portList.indexOf(currentSelection);

    if (index >= 0)

    {

        ui->cbPortList->setCurrentIndex(index);

        tbPortList.setCurrentIndex(index);

    }

}

void PortControl::loadBaudRateList()

{

    ui->cbBaudRate->clear();

    for (auto baudRate : QSerialPortInfo::standardBaudRates())

    {

        ui->cbBaudRate->addItem(QString::number(baudRate));

    }

}

void PortControl::selectBaudRate(QString baudRate)

{

    if (serialPort->isOpen())

    {

        if (!serialPort->setBaudRate(baudRate.toInt()))

        {

            qCritical() << "Can't set baud rate!";

        }

    }

}

void PortControl::selectParity(int parity)

{

    if (serialPort->isOpen())

    {

        if(!serialPort->setParity((QSerialPort::Parity) parity))

        {

            qCritical() << "Can't set parity option!";

        }

    }

}

void PortControl::selectDataBits(int dataBits)

{

    if (serialPort->isOpen())

    {

        if(!serialPort->setDataBits((QSerialPort::DataBits) dataBits))

        {

            qCritical() << "Can't set numer of data bits!";

        }

    }

}

void PortControl::selectStopBits(int stopBits)

{

    if (serialPort->isOpen())

    {

        if(!serialPort->setStopBits((QSerialPort::StopBits) stopBits))

        {

            qCritical() << "Can't set number of stop bits!";

        }

    }

}

void PortControl::selectFlowControl(int flowControl)

{

    if (serialPort->isOpen())

    {

        if(!serialPort->setFlowControl((QSerialPort::FlowControl) flowControl))

        {

            qCritical() << "Can't set flow control option!";

        }

    }

}

void PortControl::togglePort()

{

    if (serialPort->isOpen())

    {

        serialPort->close();

        qDebug() << "Closed port:" << serialPort->portName();

        emit portToggled(false);

    }

    else

    {

        // we get the port name from the edit text, which may not be

        // in the portList if user hasn't pressed Enter

        // Also note that, portText may not be the `portName`

        QString portText = ui->cbPortList->currentText();

        QString portName;

        int portIndex = portList.indexOf(portText);

        if (portIndex < 0) // not in list, add to model and update the selections

        {

            portList.appendRow(new PortListItem(portText));

            ui->cbPortList->setCurrentIndex(portList.rowCount()-1);

            tbPortList.setCurrentIndex(portList.rowCount()-1);

            portName = portText;

        }

        else

        {

            // get the port name from the data field

            portName = static_cast<PortListItem*>(portList.item(portIndex))->portName();

        }

        serialPort->setPortName(ui->cbPortList->currentData(PortNameRole).toString());

        // open port

        if (serialPort->open(QIODevice::ReadWrite))

        {

            // set port settings

            selectBaudRate(ui->cbBaudRate->currentText());

            selectParity((QSerialPort::Parity) parityButtons.checkedId());

            selectDataBits((QSerialPort::DataBits) dataBitsButtons.checkedId());

            selectStopBits((QSerialPort::StopBits) stopBitsButtons.checkedId());

            selectFlowControl((QSerialPort::FlowControl) flowControlButtons.checkedId());

            qDebug() << "Opened port:" << serialPort->portName();

            emit portToggled(true);

        }

    }

    openAction.setChecked(serialPort->isOpen());

}

void PortControl::selectPort(QString portName)

{

    // portName may be coming from combobox

    portName = portName.split(" ")[0];

    // has selection actually changed

    if (portName != serialPort->portName())

    {

        // if another port is already open, close it by toggling

        if (serialPort->isOpen())

        {

            togglePort();

            // open new selection by toggling

            togglePort();

        }

    }

}

QString PortControl::selectedPortName()

{

    QString portText = ui->cbPortList->currentText();

    int portIndex = portList.indexOf(portText);

    if (portIndex < 0) // not in the list yet

    {

        // return the displayed name as port name

        return portText;

    }

    else

    {

        // get the port name from the 'port list'

        return static_cast<PortListItem*>(portList.item(portIndex))->portName();

    }

}

QToolBar* PortControl::toolBar()

{

    return &portToolBar;

}

void PortControl::openActionTriggered(bool checked)

{

    togglePort();

}

void PortControl::onCbPortListActivated(int index)

{

    tbPortList.setCurrentIndex(index);

}

void PortControl::onTbPortListActivated(int index)

{

    ui->cbPortList->setCurrentIndex(index);

}

void PortControl::saveSettings(QSettings* settings)

{

    settings->beginGroup("Port");

    settings->setValue("selectedPort", selectedPortName());

    settings->setValue("baudRate", ui->cbBaudRate->currentText());

    settings->endGroup();

}

void PortControl::loadSettings(QSettings* settings)

{

    settings->beginGroup("Port");

    // set port name if it exists in the current list otherwise ignore

    QString portName = settings->value("selectedPort", QString()).toString();

    if (!portName.isEmpty())

    {

        int index = portList.indexOfName(portName);

        if (index > -1) ui->cbPortList->setCurrentIndex(index);

    }

    // load baud rate setting if it exists in baud rate list

    QString baudSetting = settings->value(

        "baudRate", ui->cbBaudRate->currentText()).toString();

    int baudIndex = ui->cbBaudRate->findText(baudSetting);

    if (baudIndex > -1) ui->cbBaudRate->setCurrentIndex(baudIndex);

    settings->endGroup();

}