#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 DockPanel : public QWidget {
        enum class ActiveArea { LEFT, RIGHT, TOP, BOTTOM, CENTER, NONE };

    public:
        DockPanel(ViewPresent *host);

        void bind(BaseView *widget);
        BaseView *target() const;

        virtual void paintEvent(QPaintEvent *event) override;
        virtual void mouseMoveEvent(QMouseEvent *event) override;

    private:
        ViewPresent *const size_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 };

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

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

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

        virtual std::pair<SplitRect *, SplitRect *> child() const = 0;
        virtual void replace(SplitRect *view, SplitRect *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;

        virtual QRectF outline() const = 0;
        virtual void relayout(const QRectF &outline) = 0;
        virtual void retrieveComp(SplitRect *child) = 0;

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

    class SPLITVIEW_EXPORT SplitView : public QWidget, public SplitRect {

    public:
        SplitView(SplitRect *first, SplitRect *next, QWidget *parent = nullptr);

        // SplitRect interface
    public:
        virtual QWidget *bind() const override;
        virtual ViewPresent *viewPanel() const override;
        virtual SplitRect *parentRect() const override;
        virtual void setParentRect(SplitRect *pinst) override;

        virtual std::pair<SplitRect *, SplitRect *> child() const 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;
        virtual void replace(SplitRect *view, SplitRect *old) override;

        virtual QRectF outline() const override;
        virtual void relayout(const QRectF &outline) override;
        virtual void retrieveComp(SplitRect *child_inst) 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;

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

    private:
        SplitRect *parent_inst;
        QList<SplitRect *> 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 SplitRect {
        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 *ptr) const;

        // SplitRect interface
    public:
        virtual QWidget *bind() const override;
        virtual ViewPresent *viewPanel() const override;
        virtual SplitRect *parentRect() const override;
        virtual void setParentRect(SplitRect *pinst) override;
        virtual std::pair<SplitRect *, SplitRect *> child() const override;
        virtual void replace(SplitRect *view, SplitRect *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;
        virtual QRectF outline() const override;
        virtual void relayout(const QRectF &outline) override;

        virtual void paintEvent(QPaintEvent *ev) override;
        virtual void retrieveComp(SplitRect *child_inst) override;

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

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

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

        void registViewComp(BaseView *it);

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

        void append(SplitRect *inst, uint index);

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

        // SplitRect interface
    public:
        virtual QWidget *bind() const override;
        virtual ViewPresent *viewPanel() const override;
        virtual SplitRect *parentRect() const override;
        virtual void setParentRect(SplitRect *pinst) override;

        virtual std::pair<SplitRect *, SplitRect *> child() const override;
        virtual void replace(SplitRect *view, SplitRect *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;
        virtual QRectF outline() const override;
        virtual void relayout(const QRectF &outline) override;
        virtual void retrieveComp(SplitRect *child_inst) 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:
        DockPanel *const accept_panel;
        BaseView *adjust_view_store;
        bool press_flags = false;
        bool adjust_state = false;
        QList<SplitRect *> view_anchors;
        // 方向，splitter位置，splitter宽度，extend索引
        std::tuple<SplitType, float, float, uint> split_info_store;
        QList<BaseView *> all_sep_views;

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

} // namespace SplitFrame

#endif // SPLITVIEW_H