#ifndef SPLITVIEW_H
#define SPLITVIEW_H

#include "SplitView_global.h"
#include <QHash>
#include <QIcon>
#include <QLabel>
#include <QWidget>

namespace SplitFrame {
    class SplitRect;
    class ViewPresent;
    class BaseView;

    /**
     * @brief 承接堆放操作及设定摆放位置
     */
    class SPLITVIEW_EXPORT AttachPanel : public QWidget {
        enum class ActiveArea { LEFT, RIGHT, TOP, BOTTOM, CENTER, NONE };

    public:
        AttachPanel(ViewPresent *host);

        void bindAttachment(BaseView *widget);
        BaseView *attachmentTarget() const;

        virtual void paintEvent(QPaintEvent *event) override;
        virtual void dragMoveEvent(QDragMoveEvent *event) override;
        virtual void dragEnterEvent(QDragEnterEvent *event) override;
        virtual void dropEvent(QDropEvent *event) override;

    private:
        ViewPresent *const adjust_host;
        BaseView *current_target;
        ActiveArea active_comp;

        std::tuple<QRectF, QRectF, QRectF, QRectF, QRectF> view_rects() const;
    };

    enum class SplitType { SPLIT_H = 0, SPLIT_V = 1 };

    class RectCom {
    public:
        virtual ~RectCom() = default;

        virtual ViewPresent *viewPanel() const = 0;
        virtual QWidget *bind() const = 0;
        virtual bool contains(QWidget *ptr) const = 0;

        virtual QRectF outline() const = 0;
        virtual void relayout(const QRectF &outline) = 0;

        virtual void setParentRect(SplitRect *inst) = 0;
        virtual SplitRect *parentRect() const = 0;

        virtual void paintEvent(QPaintEvent *ev) = 0;
    };

    class ResManager {
    public:
        virtual ~ResManager() = default;

        virtual void objsRelateRebuild() = 0;

        virtual void markFreedom(BaseView *view) = 0;
        virtual void markUnused(SplitRect *item) = 0;
        virtual void unusedResRelease() = 0;
    };

    /**
     * @brief 分裂视图规划和约束组件
     */
    class SplitRect : public RectCom {
    public:
        virtual ~SplitRect() = default;

        virtual std::pair<RectCom *, RectCom *> child() const = 0;
        virtual void removeComp(BaseView *child) = 0;
        virtual void replaceComp(RectCom *view, RectCom *old) = 0;
        virtual float splitterWidth() const = 0;
        virtual float splitterPos() const = 0;
        virtual SplitType splitType() const = 0;
        virtual void setSplitInfo(SplitType type, float pos, float width, bool relayout = true) = 0;
    };

    /**
     * @brief 分割视图
     */
    class SPLITVIEW_EXPORT SplitView : public QWidget, public SplitRect {

    public:
        SplitView(RectCom *first, RectCom *next, QWidget *parent = nullptr);
        virtual ~SplitView();

        // RectCom interface
    public:
        virtual QWidget *bind() const override;
        virtual ViewPresent *viewPanel() const override;
        virtual QRectF outline() const override;
        virtual void relayout(const QRectF &outline) override;
        virtual void setParentRect(SplitRect *inst) override;
        virtual SplitRect *parentRect() const override;
        virtual void paintEvent(QPaintEvent *ev) override;
        virtual bool contains(QWidget *ptr) const override;

        // SplitRect interface
    public:
        virtual std::pair<RectCom *, RectCom *> child() const override;
        virtual void removeComp(BaseView *child) override;
        virtual void replaceComp(RectCom *view, RectCom *old) override;
        virtual float splitterWidth() const override;
        virtual float splitterPos() const override;
        virtual SplitType splitType() const override;
        virtual void setSplitInfo(SplitType type, float pos, float width, bool relayout) override;

        // QObject interface
    public:
        virtual bool eventFilter(QObject *watched, QEvent *event) override;

        // QWidget interface
    protected:
        virtual void mousePressEvent(QMouseEvent *event) override;
        virtual void mouseReleaseEvent(QMouseEvent *event) override;
        virtual void mouseMoveEvent(QMouseEvent *event) override;
        virtual void resizeEvent(QResizeEvent *event) override;

    private:
        SplitRect *parent_inst;
        QList<RectCom *> child_store;
        // type, pos, width
        std::tuple<SplitType, float, float> split_info_value;
        bool press_flags = false, drags_flag = false;

        virtual void relayout();
        std::pair<QRectF, QRectF> viewRects();
        QRectF handleRect() const;
    };

    class DragHeader : public QFrame {
    public:
        DragHeader(BaseView *bind);

        void setIcon(const QIcon &icon);
        QIcon icon() const;
        void setText(const QString &title);
        QString text() const;

    private:
        QIcon icon_inst;
        QLabel *const icon_store, *const title_store;
        BaseView *const view_core;
        std::tuple<bool, QPointF> press_flag = std::make_tuple(false, QPointF());

        // QWidget interface
    protected:
        virtual void mousePressEvent(QMouseEvent *event) override;
        virtual void mouseReleaseEvent(QMouseEvent *event) override;
        virtual void mouseMoveEvent(QMouseEvent *event) override;
    };

    /**
     * @brief 基础内容视图组件
     */
    class SPLITVIEW_EXPORT BaseView : public QWidget, public RectCom {
        friend class ViewPresent;

    public:
        BaseView(const QString &title, QWidget *view, bool empty = false, QWidget *parent = nullptr);

        virtual void setTitle(const QString &title);
        virtual QString title() const;

        virtual void setIcon(const QIcon &icon);
        virtual QIcon viewIcon() const;

        virtual void closeView();
        virtual bool contains(QWidget *inst) const override;

        // RectCom interface
    public:
        virtual QWidget *bind() const override;
        virtual ViewPresent *viewPanel() const override;
        virtual QRectF outline() const override;
        virtual void relayout(const QRectF &outline) override;
        virtual void setParentRect(SplitRect *inst) override;
        virtual SplitRect *parentRect() const override;
        virtual void paintEvent(QPaintEvent *ev) override;

    private:
        DragHeader *title_header;
        SplitRect *parent_store;
        QList<QWidget *> comps_list;

    protected:
        virtual void installPerceptionHandle(ViewPresent *obj);
        virtual void registComp(QWidget *child);
    };

    class FreedomViewsListener {
    public:
        virtual ~FreedomViewsListener() = default;
        /**
         * @brief 闲置视图增加
         * @param ins
         */
        virtual void freedomAppended(RectCom *ins) = 0;
        /**
         * @brief 闲置视图减少
         * @param ins
         */
        virtual void freedomRemoved(RectCom *ins) = 0;
    };

    /**
     * @brief 分裂视图呈现组件
     */
    class SPLITVIEW_EXPORT ViewPresent : public QWidget, public SplitRect, public ResManager {
    public:
        ViewPresent(QWidget *parent = nullptr);
        virtual ~ViewPresent();

        void addListener(FreedomViewsListener *lsn);
        void removeListener(FreedomViewsListener *lsn);
        //======================================================
        void registViewComp(BaseView *it);
        //======================================================
        virtual void markFreedom(BaseView *view) override;
        void setTempVisible(BaseView *target = nullptr);

        /**
         * @brief 切换视图调整状态
         * @param state 状态开关
         */
        void setViewAdjust(BaseView *one = nullptr);
        bool adjustState() const;
        BaseView *adjustView() const;

        void resetViews(RectCom *center, RectCom *extend = nullptr);

        // RectCom interface
    public:
        virtual ViewPresent *viewPanel() const override;
        virtual QWidget *bind() const override;
        virtual bool contains(QWidget *ptr) const override;
        virtual QRectF outline() const override;
        virtual void relayout(const QRectF &outline) override;
        virtual void setParentRect(SplitRect *) override;
        virtual SplitRect *parentRect() const override;

        // ResManager interface
    public:
        virtual void objsRelateRebuild() override;
        virtual void markUnused(SplitRect *item) override;
        virtual void unusedResRelease() override;

        // SplitRect interface
    public:
        virtual std::pair<RectCom *, RectCom *> child() const override;
        virtual void removeComp(BaseView *child) override;
        virtual void replaceComp(RectCom *view, RectCom *old) override;
        virtual float splitterWidth() const override;
        virtual float splitterPos() const override;
        virtual SplitType splitType() const override;
        virtual void setSplitInfo(SplitType type, float pos, float width, bool relayout) override;

        // QObject interface
    public:
        virtual bool eventFilter(QObject *watched, QEvent *event) override;

        // QWidget interface
    protected:
        virtual void paintEvent(QPaintEvent *ev) override;
        virtual void resizeEvent(QResizeEvent *ev) override;
        virtual void mousePressEvent(QMouseEvent *event) override;
        virtual void mouseReleaseEvent(QMouseEvent *event) override;
        virtual void mouseMoveEvent(QMouseEvent *event) override;

    private:
        AttachPanel *const accept_panel;
        QList<SplitRect *> unused_splits;

        BaseView *adjust_view_temp; // 拖拽中转
        bool press_flags = false;   // 空间调整标志
                                    // 方向，splitter位置，splitter宽度
        std::tuple<SplitType, float, float> split_info_store = std::make_tuple(SplitType::SPLIT_H, 200, 8);

        QList<RectCom *> view_anchors;
        QList<BaseView *> all_sep_views;

        QList<FreedomViewsListener *> lsn_list;
        QList<RectCom *> freedom_views;
        RectCom *temp_visible_view = nullptr;

        virtual void relayout();
        std::pair<QRectF, QRectF> viewRects();
        QRectF handleRect() const;
    };

} // namespace SplitFrame

#endif // SPLITVIEW_H