#include "pch.h"
#include "log.h"
#include "node_scroll.h"
#include "event.h"

Node* NodeScroll::clone_instantiate() const
{
    return new NodeScroll;
}

void NodeScroll::fix_scroll()
{
    auto pad = GetPadding();
    glm::vec2 padoff = { pad.y + pad.w, pad.x + pad.z };
    auto rect = get_children_rect();
    m_offset = glm::clamp(m_offset, - zw(rect) + zw(m_clip_uncut) - padoff, { 0, 0 });
    m_pos_offset_childred = m_offset;
}

kEventResult NodeScroll::handle_event(Event* e)
{
    NodeBorder::handle_event(e);
    auto me = static_cast<MouseEvent*>(e);
    auto ge = static_cast<GestureEvent*>(e);
    auto loc = (me->m_pos - m_pos) * root()->m_zoom;
    switch (e->m_type)
    {
    case kEventType::MouseDownL:
        m_dragging = true;
        m_drag_start = me->m_pos;
        m_offset_start = m_offset;
        mouse_capture();
        break;
    case kEventType::MouseMove:
        if (m_dragging)
        {
            m_offset = m_offset_start + (me->m_pos - m_drag_start) * m_mask;
            fix_scroll();
        }
        break;
    case kEventType::MouseUpL:
        mouse_release();
        m_dragging = false;
        break;
     case kEventType::MouseScroll:
        m_offset += me->m_scroll_delta * 50;
        fix_scroll();
        break;
    case kEventType::GestureStart:
        m_offset_start = m_offset;
        mouse_capture();
        break;
    case kEventType::GestureMove:
        m_offset = m_offset_start + ge->m_pos_delta * m_mask;
        fix_scroll();
        break;
    case kEventType::GestureEnd:
        mouse_release();
        break;
    case kEventType::MouseCancel:
        mouse_release();
        m_dragging = false;
        break;
    default:
        return kEventResult::Available;
        break;
    }
    return kEventResult::Consumed;
}