#include "inputcurve.h"

#include <QLabel>
#include <QPushButton>
#include <QPainter>
#include "Curve.h"
#include "dialogcurve.h"

class CurveSmallPreview:public QWidget
{
public:
    CurveSmallPreview(QWidget* parent, Curve* curve, double xmin, double xmax, double ymin, double ymax) : QWidget(parent)
    {
        _curve = curve;
        _xmin = xmin;
        _xmax = xmax;
        _ymin = ymin;
        _ymax = ymax;
    }

    void paintEvent(QPaintEvent*)
    {
        if (!_curve)
        {
            return;
        }
        
        QPainter painter(this);
        int width = this->width();
        int height = this->height();
        double position, value, prev_value, next_value;

        painter.fillRect(rect(), QColor(255, 255, 255));
        for (int x = 0; x < width; x++)
        {
            painter.setPen(QColor(0, 0, 0));
            position = _xmin + (_xmax - _xmin) * (double)x / (double)(width - 1);
            value = (_curve->getValue(position) - _ymin) * (_ymax - _ymin);
            prev_value = (_curve->getValue(position - (_xmax - _xmin) / (double)(width - 1)) - _ymin) * (_ymax - _ymin);
            next_value = (_curve->getValue(position + (_xmax - _xmin) / (double)(width - 1)) - _ymin) * (_ymax - _ymin);

            painter.drawLine(x, height - 1 - (int)((value + (prev_value - value) / 2.0) * (double)(height - 1)), x, height - 1 - (int)((value + (next_value - value) / 2.0) * (double)(height - 1)));
            painter.drawPoint(x, height - 1 - (int)(value * (double)(height - 1)));
        }
    }
    Curve* _curve;
    double _xmin;
    double _xmax;
    double _ymin;
    double _ymax;
};

InputCurve::InputCurve(QWidget* form, QString label, Curve* value, double xmin, double xmax, double ymin, double ymax, QString xlabel, QString ylabel) : BaseInput(form, label)
{
    _value = value;
    _xmin = xmin;
    _xmax = xmax;
    _ymin = ymin;
    _ymax = ymax;
    _xlabel = xlabel;
    _ylabel = ylabel;
    
    _preview = new CurveSmallPreview(form, value, xmin, xmax, ymin, ymax);
    _preview->setMinimumSize(100, 40);
    _control = new QPushButton(tr("Edit"), form);
    _control->setMaximumWidth(150);

    connect((QPushButton*)_control, SIGNAL(clicked()), this, SLOT(editCurve()));
}

void InputCurve::updatePreview()
{
    _preview->update();

    BaseInput::updatePreview();
}

void InputCurve::applyValue()
{
    BaseInput::applyValue();
}

void InputCurve::revert()
{
    BaseInput::revert();
}

void InputCurve::editCurve()
{
    if (DialogCurve::getCurve(_control, _value, _xmin, _xmax, _ymin, _ymax, _xlabel, _ylabel))
    {
        applyValue();
    }
}