#include "stretchpanel.h"
#include <QVBoxLayout>

StretchPanel::StretchPanel(QWidget *parent) : QWidget(parent)
{
    QVBoxLayout *layout = new QVBoxLayout(this);
    setLayout(layout);

    m_lowSlider = new QSlider(Qt::Horizontal, this);
    m_highSlider = new QSlider(Qt::Horizontal, this);
    m_paramSlider = new QSlider(Qt::Horizontal, this);

    m_lowSlider->setRange(0, UINT16_MAX);
    m_lowSlider->setPageStep(512);
    m_highSlider->setRange(0, UINT16_MAX);
    m_highSlider->setPageStep(512);
    m_highSlider->setValue(UINT16_MAX);
    m_paramSlider->setRange(0, UINT16_MAX);
    m_paramSlider->setPageStep(512);

    m_stretchSelect = new QComboBox(this);
    m_stretchSelect->addItems({tr("Linear"), tr("Square root"), tr("Power"), tr("Logarithm"), tr("Asinh")});

    layout->addWidget(m_lowSlider);
    layout->addWidget(m_highSlider);
    layout->addWidget(m_paramSlider);
    layout->addWidget(m_stretchSelect);

    connect(m_lowSlider, SIGNAL(valueChanged(int)), this, SIGNAL(lowChanged(int)));
    connect(m_highSlider, SIGNAL(valueChanged(int)), this, SIGNAL(highChanged(int)));
    connect(m_paramSlider, SIGNAL(valueChanged(int)), this, SLOT(calculateParam()));
    connect(m_stretchSelect, SIGNAL(activated(int)), this, SIGNAL(stretchChanged(int)));
    connect(m_stretchSelect, SIGNAL(activated(int)), this, SLOT(calculateParam()));
}

void StretchPanel::calculateParam()
{
    float val = m_paramSlider->value();
    float param;
    switch(m_stretchSelect->currentIndex())
    {
    case 2:
        param = val*100/UINT16_MAX;
        break;
    case 3:
        param = val;
        break;
    case 4:
        val += 100;
        param = val/100.0f;
        break;
    default:
        return;
    }
    emit paramChanged(param);
}