#include "common/core_model/diagram.h"
#include "diagramEditor/editorLayoutConfig.h"
#include <QStandardItem>
// layout_engine.h
/********editor布局生成核心类**********/

class DiagramEditorModel;

class DiagramLayoutEngine {
public:
    struct Context {
        int sourceId = 0;
        QString currentRouteId;      // 当前正在处理的线路ID
        bool isRemovingRoute = false; // 是否为删除操作
        bool saveToModel = false;
        QMap<QString, QStandardItem*> itemCache;
        QMap<QString, DiagramEditorComponentInfo> componentsCache;
        QMap<QString, QSet<Direction>> branchUsedDirections;        //key: 组件名  value: 已被支线占用的方向集合
        QMap<QString, QMap<int,DirectionOccupancyRecord>> directionOccupancyMap;
        QMap<QString, DirectionOccupancyRouteInfo> routeDirectionMap;

        void initComponentsCache(const QMap<QString, DiagramEditorComponentInfo>& compos) {
            componentsCache = compos;
        }

        void initDirectionOccupancyCache(const QMap<QString, QMap<int,DirectionOccupancyRecord>>& occus){
            directionOccupancyMap = occus;
        }

        void initRouteDirectionMapCache(const QMap<QString, DirectionOccupancyRouteInfo>& routes){
            routeDirectionMap = routes;
        }
    };

    enum class DirectionOperation {
        ADD,     // 添加方向
        REMOVE,  // 移除方向
        SET      // 设置方向（替换）
    };

    explicit DiagramLayoutEngine(DiagramEditorModel* model)
        : m_model(model) {}

    QRectF executeLayout(
        QMap<QString, DiagramEditorRouteInfo>& routes,
        QMap<QString, DiagramEditorComponentInfo>& components,
        QMap<QString, QMap<int,DirectionOccupancyRecord>>& directionOccupancyMap,
        QMap<QString, DirectionOccupancyRouteInfo>& routeDirectionMap,
        const LayoutConfig& config,
        Context& context
        );
    bool clearRouteDirectionOccupancy(const QString& routeId,Context& context);
private:
    // 主线相关
    QString findMainRoute(const QMap<QString, DiagramEditorRouteInfo>& routes);
    void layoutMainRoute(DiagramEditorRouteInfo& route,
                         const LayoutConfig& config,
                         Context& context);
    void layoutMainRouteInternal(DiagramEditorRouteInfo& route,const LayoutConfig& config,Context& context);

    // 支线相关
    void layoutBranchRoute(DiagramEditorRouteInfo& route,
                           const LayoutConfig& config,
                           Context& context);
    void splitBranchRoute(DiagramEditorRouteInfo& route,
                          Context& context);
    void layoutBranchSequence(QList<DiagramEditorComponentInfo>& sequence,
                              Direction branchDir,
                              const LayoutConfig& config,
                              Context& context,
                              bool isOrder,
                              int polarity);
    // 组件相关
    Direction determineBranchDirection(const DiagramEditorComponentInfo& currentNode,
                                       Direction preferredDir,
                                       Context& context);
    QPoint getComponentPosition(const QString& componentName,
                                Context& context);
    void updateComponent(DiagramEditorComponentInfo& compo,
                         int dir,
                         const QPoint& position,
                         int rotate,
                         Context& context);
    //记录线路在组件上的方向占用
    bool recordRouteDirectionOccupancy(const QString& routeId,const QString& compoName,int directionMask,Context& context);  //线路ID,组件名称,方向位掩码
    /**
     * @brief 统一更新组件方向占用
     * @param compoName 组件名称
     * @param directionMask 方向掩码 (8上,4下,2左,1右)
     * @param operation 操作类型: 添加、移除、设置
     * @param context 上下文
     * @return 是否成功
     */
    bool updateComponentDirections(const QString& compoName,int directionMask,DirectionOperation operation,Context& context);
    bool updateComponentCacheInternal(const QString& compoName,int directionMask,DirectionOperation operation,Context& context);
    bool updateComponentModel(const QString& compoName,int directionMask,DirectionOperation operation,Context& context);

    // 辅助函数
    QStandardItem* getNameItem(const QString& name, Context& context);
    int getComponentDirection(const QString& compoName, Context& context);
    QRectF calculateBoundingRect(const QMap<QString, DiagramEditorComponentInfo>& components);
    Direction getRouteDirection(const QString& routeName,const QMap<QString, DiagramEditorRouteInfo>& routes);
    int getComponentTotalOccupiedDirections(const QString& compoName, Context& context);        //从总占用表中获取元件占用方向
    int getComponentDirectionFromCache(const QString& compoName,const QString& routeId,Context& context);       //从缓存获取方向占用
    QString getDirectionName(int dirBit) {
        switch (dirBit) {
        case 8: return "上";
        case 4: return "下";
        case 2: return "左";
        case 1: return "右";
        default: return QString("未知(%1)").arg(dirBit);
        }
    }

    int getOppositeDirection(int dirBit) {
        switch (dirBit) {
        case 8: return 4;  // 上 ↔ 下
        case 4: return 8;  // 下 ↔ 上
        case 2: return 1;  // 左 ↔ 右
        case 1: return 2;  // 右 ↔ 左
        default: return 0;
        }
    }

    int getDirectionIndex(int dirBit) {
        switch (dirBit) {
        case 1: return 0;  // 右
        case 2: return 1;  // 左
        case 4: return 2;  // 下
        case 8: return 3;  // 上
        default: return -1;
        }
    }
private:
    int m_compoWidth = 50;
    int m_compoHeight = 30;
    DiagramEditorModel* m_model = nullptr;
};