/*
  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/>.
*/

#ifndef DATAFORMATPANEL_H
#define DATAFORMATPANEL_H

#include <QWidget>
#include <QButtonGroup>
#include <QTimer>
#include <QSerialPort>
#include <QList>
#include <QtGlobal>

#include "framebuffer.h"

namespace Ui {
class DataFormatPanel;
}

class DataFormatPanel : public QWidget
{
    Q_OBJECT

public:
    explicit DataFormatPanel(QSerialPort* port,
                             QList<FrameBuffer*>* channelBuffers,
                             QWidget *parent = 0);
    ~DataFormatPanel();

    unsigned numOfChannels();
    unsigned samplesPerSecond();
    bool skipByteEnabled(void); // true for binary formats

public slots:
    // during next read operation reader will skip 1 byte,
    // requests are not accumulated
    void requestSkipByte();
    void pause(bool);
    void enableDemo(bool); // demo shouldn't be enabled when port is open

signals:
    void numOfChannelsChanged(unsigned);
    void samplesPerSecondChanged(unsigned);
    void skipByteEnabledChanged(bool);
    void dataAdded();

private:
    enum NumberFormat
    {
        NumberFormat_uint8,
        NumberFormat_uint16,
        NumberFormat_uint32,
        NumberFormat_int8,
        NumberFormat_int16,
        NumberFormat_int32,
        NumberFormat_float,
        NumberFormat_ASCII
    };

    Ui::DataFormatPanel *ui;
    QButtonGroup numberFormatButtons;

    QSerialPort* serialPort;
    QList<FrameBuffer*>* _channelBuffers;

    unsigned int _numOfChannels;
    NumberFormat numberFormat;
    unsigned int sampleSize; // number of bytes in the selected number format
    bool skipByteRequested;
    bool paused;

    const int SPS_UPDATE_TIMEOUT = 1;  // second
    unsigned _samplesPerSecond;
    unsigned int sampleCount;
    QTimer spsTimer;

    // demo
    QTimer demoTimer;
    int demoCount;

    void selectNumberFormat(NumberFormat numberFormatId);

    // points to the readSampleAs function for currently selected number format
    double (DataFormatPanel::*readSample)();

    // note that serialPort should already have enough bytes present
    template<typename T> double readSampleAs();

    // `data` contains i th channels data
    void addChannelData(unsigned int channel, double* data, unsigned size);

private slots:
    void onDataReady();      // used with binary number formats
    void onDataReadyASCII(); // used with ASCII number format
    void onNumberFormatButtonToggled(int numberFormatId, bool checked);
    void onNumOfChannelsSP(int value);
    void spsTimerTimeout();
    void demoTimerTimeout();
};

#endif // DATAFORMATPANEL_H