#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;
    m_pMovingItemCopy = nullptr;
}
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)
        {
            //需要增加当前是否点击在控制点的判断函数
            if(ms_nDragHandle != H_none && ms_nDragHandle <= H_left) //在缩放控制点上
                ms_opMode = OM_scale;
            else if(ms_nDragHandle > H_left) //编辑控制点上
            {
                ms_opMode = OM_edit;
                //setCursor(scene, Qt::ClosedHandCursor);
            }
            else
            {
                ms_opMode = OM_move;
                setCursor(scene, Qt::ClosedHandCursor);

                //创建移动时显示的item副本
                m_pMovingItemCopy = new QGraphicsPathItem(item->shape());
                m_pMovingItemCopy->setPen(Qt::DashLine);
                m_pMovingItemCopy->setPos(item->pos());
                m_pMovingItemCopy->setTransformOriginPoint(item->transformOriginPoint());
                m_pMovingItemCopy->setTransform(item->transform());
                m_pMovingItemCopy->setRotation(item->rotation());
                m_pMovingItemCopy->setScale(item->scale());
                m_pMovingItemCopy->setZValue(item->zValue());
                scene->addItem(m_pMovingItemCopy);

                m_movingItemIniPos = item->pos();
            }
        }
    }
    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);
            }
            else if(ms_nDragHandle > H_left && ms_opMode == OM_edit) //编辑形状
            {

            }
            else if(ms_opMode == OM_move)
            {
                if(m_pMovingItemCopy)
                    m_pMovingItemCopy->setPos(m_movingItemIniPos + (ms_ptMouseLast - ms_ptMouseDown));
            }
        }
    }

    if (ms_opMode != OM_scale && items.count() > 1) //例如多选移动等采用默认行为
    {
        scene->callParentEvent(event);
    }

}

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(m_movingItemIniPos + (ms_ptMouseLast - ms_ptMouseDown));
        }
    }

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

    if(m_pMovingItemCopy)
    {
        scene->removeItem(m_pMovingItemCopy);
        delete m_pMovingItemCopy;
        m_pMovingItemCopy = nullptr;
    }

    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);
}