/*
  Copyright © 2019 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 <math.h>

#include "demoreader.h"

#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif

DemoReader::DemoReader(QIODevice* device, QObject* parent) :
    AbstractReader(device, parent)
{
    paused = false;
    _numChannels = _settingsWidget.numChannels();
    connect(&_settingsWidget, &DemoReaderSettings::numChannelsChanged,
            this, &DemoReader::onNumChannelsChanged);

    count = 0;
    timer.setInterval(100);
    connect(&timer, &QTimer::timeout,
            this, &DemoReader::demoTimerTimeout);
}

QWidget* DemoReader::settingsWidget()
{
    return &_settingsWidget;
}

void DemoReader::enable(bool enabled)
{
    if (enabled)
    {
        timer.start();
    }
    else
    {
        timer.stop();
    }

    AbstractReader::enable(enabled);
}

unsigned DemoReader::numChannels() const
{
    return _numChannels;
}

void DemoReader::setNumChannels(unsigned value)
{
    _settingsWidget.setNumChannels(value);
}

void DemoReader::demoTimerTimeout()
{
    const double period = 100;
    count++;
    if (count >= 100) count = 0;

    if (!paused)
    {
        SamplePack samples(1, _numChannels);
        for (unsigned ci = 0; ci < _numChannels; ci++)
        {
            // we are calculating the fourier components of square wave
            samples.data(ci)[0] = 4*sin(2*M_PI*double((ci+1)*count)/period)/((2*(ci+1))*M_PI);
        }
        feedOut(samples);
    }
}

void DemoReader::onNumChannelsChanged(unsigned value)
{
    _numChannels = value;
    updateNumChannels();
}

unsigned DemoReader::readData()
{
    // intentionally empty, required by AbstractReader
    return 0;
}