#include "util/connectingSelector.h"
#include "graphicsItem/itemControlHandle.h"
#include "graphicsItem/itemPort.h"
#include "graphicsItem/electricConnectLineItem.h"
#include <QGraphicsSceneMouseEvent>
#include <QGraphicsView>
#include <graphicsItem/graphicsBaseItem.h>

ConnectingSelector::ConnectingSelector(QObject *parent)
    : BaseSelector(parent)
    ,m_pConnectingItem(nullptr)
    ,m_pTouchedItem(nullptr)
{
    m_type = ST_connecting;
    m_bReadyConnect = false;
}
ConnectingSelector::~ConnectingSelector()
{

}

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

}

bool ConnectingSelector::targetCouldConnect(GraphicsBaseItem* p,QPointF pos)
{
    GraphicsItemType iType = p->getItemType();
    if(iType == GIT_bus)
    {
        setTargetHighLight(true);
        return true;
    }
    else
    {
        int nHandle = p->collidesWithHandle(pos);
        if(nHandle >= H_connect ) //连接控制点
        {
            setTargetHighLight(false);
            p->setLastPort(nHandle);
            ItemPort* pt = p->getPortPtr(nHandle);
            if(pt)
            {
                HandleType targetDir = pt->getType();
                bool bCon = pt->connected();

                if(m_pConnectingItem)
                {
                    ItemPort* ptSrc = m_pConnectingItem->getPortPtr(ms_nDragHandle);
                    HandleType sourceDir = ptSrc->getType();

                    if((targetDir != sourceDir) && !bCon)
                    {
                        setTargetHighLight(true);
                        return true;
                    }
                }
            }
        }
        else        //超出了触碰范围
        {
            setTargetHighLight(false);
            p->setLastPort(-1);
        }
    }
    return false;
}

void ConnectingSelector::setTargetHighLight(bool val)
{
    if(m_pTouchedItem)
    {
        GraphicsItemType iType = m_pTouchedItem->getItemType();
        if(iType == GIT_bus)
        {
            m_pTouchedItem->setTouched(val);
        }
        else
        {
            int n = m_pTouchedItem->getLastPort();
            if(n != -1)
                m_pTouchedItem->setHandleVisible(n,val);
        }
    }
}

void ConnectingSelector::createConnectLline(GraphicsBaseItem* connectingItem,GraphicsBaseItem* touchedItem,DesignerScene* scene)
{
    ElectricConnectLineItem* pItem = new ElectricConnectLineItem();
    pItem->setItemId(++_Id);
    pItem->setItemType(GIT_link);
    scene->addItem(pItem);

    ItemPort* ptSrc = connectingItem->getPortPtr(ms_nDragHandle);
    int srcId = connectingItem->itemId();
    int srcPort = ptSrc->getTag();
    HandleType srcType = ptSrc->getType();
    PortPos srcPos = ptSrc->portPos();
    pItem->setStartPoint(ptSrc->scenePos());
    ptSrc->setConnect(pItem);

    ItemPort* ptDest = nullptr;
    if(touchedItem->getItemType() == GIT_bus)       //母线动态创建port
    {
        int nId = touchedItem->addPort(p_movable,touchedItem->mapFromScene(ms_ptMouseLast));
        if(nId != -1)
        {
            ptDest = touchedItem->getPortPtr(nId);
            pItem->setEndPoint(ptDest->scenePos());
        }
    }
    else
    {
        int nLastPort = touchedItem->getLastPort();
        ptDest = touchedItem->getPortPtr(nLastPort);
        pItem->setEndPoint(ptDest->scenePos());
    }

    if(ptDest != nullptr)
    {
        int destId = touchedItem->itemId();
        int destPort = ptDest->getTag();
        HandleType destType = ptDest->getType();
        PortPos destPos = ptDest->portPos();

        pItem->calculatePath();
        pItem->setConnection(Connection(srcId,srcPort,srcType,srcPos,destId,destPort,destType,destPos));
        ptDest->setConnect(pItem);

        m_graphicsItem[sceneName()].insert(QString::number(pItem->itemId()),pItem);         //插入连接线到总表
    }
}

void ConnectingSelector::mouseMoveEvent(QGraphicsSceneMouseEvent* event, DesignerScene* scene)
{
    ms_ptMouseLast = event->scenePos();
    if(m_pConnectingItem == nullptr)
    {
        QList<QGraphicsItem *> items = scene->selectedItems();
        if (items.count() == 1)
        {
            GraphicsBaseItem* item = qgraphicsitem_cast<GraphicsBaseItem*>(items.first());
            if(item)
            {
                if(ms_nDragHandle >= H_connect)
                {
                    ItemPort* pt = item->getPortPtr(ms_nDragHandle);
                    if(pt)
                    {
                        if(pt->connected())         //只判断未连接的port
                            return;
                        item->setState(S_prepareConnect);
                        QPointF start = item->mapFromScene(ms_ptMouseDown);
                        QPointF end = item->mapFromScene(ms_ptMouseLast);
                        item->setBeginConnectPos(start);
                        item->setEndConnectPos(end);
                        m_pConnectingItem = item;
                    }
                }
            }
        }
    }
    else
    {
        if(m_pConnectingItem)
        {
            QPointF end = m_pConnectingItem->mapFromScene(ms_ptMouseLast);
            m_pConnectingItem->setEndConnectPos(end);

            QList<QGraphicsItem *> items = scene->items(ms_ptMouseLast);
            if (items.count() == 1)
            {
                GraphicsBaseItem* item = dynamic_cast<GraphicsBaseItem*>(items.first());
                if(item)
                {
                    int n1 = item->itemId();
                    int n2 = m_pConnectingItem->itemId();
                    if(n1 != n2)           //判断两个对象是否相同
                    {
                        m_pTouchedItem = item;
                        m_bReadyConnect = targetCouldConnect(item,ms_ptMouseLast);
                    }
                }
            }
            if(items.isEmpty())
            {
                //todo取消选中
                m_bReadyConnect = false;
                setTargetHighLight(false);
                if(m_pTouchedItem)
                {
                    m_pTouchedItem->setLastPort(-1);
                    m_pTouchedItem = nullptr;
                }
            }
        }
    }

}

void ConnectingSelector::mouseReleaseEvent(QGraphicsSceneMouseEvent* event, DesignerScene* scene)
{
    if(m_bReadyConnect)
    {
        if(m_pConnectingItem && m_pTouchedItem)
        {
            createConnectLline(m_pConnectingItem,m_pTouchedItem,scene);
        }
    }

    if(m_pConnectingItem)
    {
        m_pConnectingItem->setState(S_normal);
    }
    if(m_pTouchedItem)
    {
        setTargetHighLight(false);
        m_pTouchedItem->setLastPort(-1);
        m_pTouchedItem = nullptr;
    }
    m_pConnectingItem = nullptr;
    ms_nDragHandle = H_none;
    setCursor(scene, Qt::ArrowCursor);
    scene->callParentEvent(event);
    emit setWorkingSelector(ST_base);
}