#include "util/baseSelector.h"
#include <QGraphicsSceneMouseEvent>
#include <QGraphicsView>
#include <graphicsItem/graphicsBaseItem.h>

OperationMode BaseSelector::ms_opMode = OM_none;
QPointF BaseSelector::ms_ptMouseDown(0.0,0.0);
QPointF BaseSelector::ms_ptMouseLast(0.0,0.0);
int BaseSelector::ms_nDragHandle = 0;

BaseSelector::BaseSelector(QObject *parent)
    : QObject(parent)
{
    m_type = ST_base;
    m_bHoverOnHandel = false;
}
BaseSelector::~BaseSelector()
{

}

void BaseSelector::mousePressEvent(QGraphicsSceneMouseEvent* event, DesignerScene* scene)
{
    if (event->button() != Qt::LeftButton)
        return;

    ms_ptMouseDown = event->scenePos();
    ms_ptMouseLast = event->scenePos();

    if(!m_bHoverOnHandel)
        scene->callParentEvent(event); //此处是通过触发QGraphicsScene的事件函数来取消所有被选中item的选中状态

    ms_opMode = OM_none;
    GraphicsBaseItem* item = nullptr;

    QList<QGraphicsItem *> items = scene->selectedItems();
    if (items.count() == 1) //只有一个选中
    {
        item = qgraphicsitem_cast<GraphicsBaseItem*>(items.first());
        if(item)
        {

        }
    }
    else if (items.count() > 1) //选中多个
    {
        ms_opMode = OM_move;
        setCursor(scene, Qt::ClosedHandCursor);
    }

    if(ms_opMode == OM_none)
    {
        QGraphicsView *view = scene->getView();
        if(view)
            view->setDragMode(QGraphicsView::RubberBandDrag);
    }

}

void BaseSelector::mouseMoveEvent(QGraphicsSceneMouseEvent* event, DesignerScene* scene)
{
    ms_ptMouseLast = event->scenePos();

    GraphicsBaseItem* item = nullptr;
    QList<QGraphicsItem *> items = scene->selectedItems();

    if (items.count() == 1)
    {
        item = qgraphicsitem_cast<GraphicsBaseItem*>(items.first());
        if(item)
        {
            if(ms_nDragHandle != H_none && ms_opMode == OM_scale)
            {
                QPointF basePoint = item->getSymmetricPointPos(ms_nDragHandle);
                if(basePoint.x() == 0)
                    basePoint.setX(1);
                if(basePoint.y() == 0)
                    basePoint.setY(1);

                //计算缩放倍数
                QPointF iniDelta = item->mapFromScene(ms_ptMouseDown) - basePoint;
                QPointF lastDelta = item->mapFromScene(ms_ptMouseLast) - basePoint;
                double sx = lastDelta.x() / iniDelta.x();
                double sy = lastDelta.y() / iniDelta.y();

                item->resize(ms_nDragHandle, sx, sy, basePoint);
            }
        }
    }
}

void BaseSelector::mouseReleaseEvent(QGraphicsSceneMouseEvent* event, DesignerScene* scene)
{

    if (event->scenePos() == ms_ptMouseDown)
        ms_opMode = OM_none;

    setCursor(scene, Qt::ArrowCursor);

    GraphicsBaseItem* item = nullptr;
    QList<QGraphicsItem *> items = scene->selectedItems();
    if (items.count() == 1)
    {
        item = qgraphicsitem_cast<GraphicsBaseItem*>(items.first());
        if(item && (ms_opMode == OM_scale || ms_opMode == OM_edit) && ms_ptMouseLast != ms_ptMouseDown)
        {
            item->updateCoordinate();
        }
        else if(item && ms_opMode == OM_move && ms_ptMouseLast != ms_ptMouseDown)
        {
            item->setPos(ms_ptMouseDown + (ms_ptMouseLast - ms_ptMouseDown));
        }
    }

    if(ms_opMode == OM_none)
    {
        QGraphicsView *view = scene->getView();
        if(view)
            view->setDragMode(QGraphicsView::NoDrag);
    }

    ms_opMode = OM_none;
    m_bHoverOnHandel = false;
    ms_nDragHandle = H_none;
    scene->callParentEvent(event);
}


void BaseSelector::setCursor(DesignerScene *scene, const QCursor &cursor)
{
    QGraphicsView *view = scene->getView();
    if (view)
        view->setCursor(cursor);
}