#ifndef ELECTRICFUNCTIONMODELCONNECTLINEITEM_H
#define ELECTRICFUNCTIONMODELCONNECTLINEITEM_H

#include <QPainterPath>
#include <QUuid>
#include "graphicsFunctionModelItem.h"

class ElectricFunctionModelConnectLineItem : public GraphicsFunctionModelItem
{
public:
    enum UShapeType {
        UShape_Unknown,
        UShape_TopOpen,      // 开口向上
        UShape_BottomOpen,   // 开口向下
        UShape_LeftOpen,     // 开口向左
        UShape_RightOpen     // 开口向右
    };
public:
    ElectricFunctionModelConnectLineItem(QGraphicsItem *parent = 0);
    virtual ~ElectricFunctionModelConnectLineItem();

    void setStartPoint(const QPointF& p);
    void setEndPoint(const QPointF& p);
    QPainterPath getPoints(void) const { return m_points; }

    void startDrag(const QPointF& scenePos);
    void updateDrag(const QPointF& scenePos);
    void endDrag();
    void setLastPoint(const QPointF& point);
    void setPath(const QPainterPath& path);
    QPainterPath path() const;

    void resetCurLine(){_curLine = QPoint();}
    void calculatePath();

    virtual QPainterPath shape() const override;
    virtual QRectF boundingRect() const override;
    virtual void paint(QPainter*, const QStyleOptionGraphicsItem*, QWidget*) override;

protected:
    void initial();
private:
    //路径计算相关
    void generateAvoidancePath(const QPointF& start, const QPointF& end,const QList<QRectF>& obstacleShapes);   // 使用形状进行避障
    double calculatePathLength(const QList<QPointF>& path);
    bool lineIntersectsRect(const QLineF& line, const QRectF& rect) const;
    bool isSegmentSafe(const QPointF& p1, const QPointF& p2,const QList<QRectF>& components);
    bool isPathSafe(const QList<QPointF>& path,const QList<QRectF>& components);
    bool segmentPenetratesComponent(const QLineF& segment,const QRectF& component);
    QRectF getTotalComponentsBounds(const QList<QRectF>& components);
    void collectRectilinearPaths(const QPointF& start, const QPointF& end,const QList<QRectF>& components,QMultiMap<double, QList<QPointF>>& paths);
    void addPathIfRectilinear(const QList<QPointF>& path,QMultiMap<double, QList<QPointF>>& paths);
    void collectBypassPaths(const QPointF& start, const QPointF& end,const QList<QRectF>& components,QMultiMap<double, QList<QPointF>>& paths);
    void generateForcedRectilinearBypass(const QPointF& start, const QPointF& end,const QList<QRectF>& components);
    QRectF findFirstBlockingComponent(const QPointF& start, const QPointF& end,const QList<QRectF>& components);

    //线段拖拽相关
    double distancePointToLine(const QLineF& line, const QPointF& point) const;
    void ensureEnoughPointsForDrag();
    void debugPathState(const QString& context) const;

    QVector<QLineF> extractSegmentsFromPainterPath() const;
    void collectBoundaryBypassPaths(const QPointF& start, const QPointF& end,const QList<QRectF>& obstacles,QMultiMap<double, QList<QPointF>>& paths);
    void collectBoundaryPath(const QPointF& start, const QPointF& end,const QList<QRectF>& obstacles,QMultiMap<double, QList<QPointF>>& paths,const QRectF& bounds, bool useTop);
    QRectF getSceneBounds() const;
    QList<QPointF> generateForcedBypass(const QPointF& start, const QPointF& end,const QList<QRectF>& components);

    // 拖拽实现
    int findSegmentAt(const QList<QPointF>& points,const QPointF& itemPos) const;
    double distanceToSegment(const QLineF& segment, const QPointF& point) const;
    void fixConnections(int segmentIndex, bool isVertical);
    QList<QPointF> extractPointsFromPath() const;
    QList<QPointF> extractPointsFromPath(const QPainterPath& path) const;
    void applyPointsToPath(const QList<QPointF>& points);
    void fixConnections(QList<QPointF>& points, int segmentIndex, bool isVertical);
    void validateAndFixPath();
    void updateBoundingRect();

private:
    QPainterPath        m_points;
    QList<QPointF>      m_lstPoints;
    QPoint              _curLine;               //参数1用点序号表示的当前线段起始点,参数2表示线段方向

    struct DragState {
        bool isActive = false;
        int segmentIndex = -1;
        bool isVertical = false;
        QPointF startScenePos;
        QPainterPath originalPath;
    };

    DragState m_dragData;
};

#endif