#include "common/ScrollBar.h"

ScrollBar::ScrollBar(const menu_options_t *options, const size_t x, const size_t y, const size_t width,
                     const size_t height)
    : Widget(options->u8g2), m_x(x), m_y(y), m_width(width), m_height(height), m_value(0), m_max(0), m_min(0),
      m_thumbHeight(0), m_thumbY(0)
{
}

void ScrollBar::render()
{
    if (m_max <= 1)
    {
        return;
    }

    for (size_t y = m_y; y < m_y + m_height; y += 2)
    {
        u8g2_DrawPixel(u8g2, m_x, y);
    }

    u8g2_DrawBox(u8g2, u8g2->width - 4, m_thumbY, 3, m_thumbHeight);
}

void ScrollBar::refresh(const size_t value, const size_t max, const size_t min)
{
    m_value = value;
    m_max = max;
    m_min = min;

    if (m_max <= 1)
    {
        return;
    }

    m_thumbHeight = std::max(m_height / 4, static_cast<size_t>(3));

    const size_t trackLength = m_height - m_thumbHeight;

    m_thumbY = m_y + (m_value * trackLength) / (m_max - 1);
}