#pragma once

#include "core/workspace/ProjectWorkspace.h"
#include "main_window/RecentProjectHistory.h"

#include <QMainWindow>
#include <QPointF>
#include <QFrame>
#include <QIcon>
#include <QTimer>

#include <QToolButton>
#include <QSet>

class ToolOptionPopup;

class QAction;
class QCheckBox;
class QComboBox;
class QDockWidget;
class QFormLayout;
class QLabel;
class QMenu;
class QFrame;
class QIcon;
class QPushButton;
class QSlider;
class QStackedWidget;
class QToolButton;
class QTreeWidget;
class QTreeWidgetItem;
class QWidget;
class EditorCanvas;
class TimelineWidget;
namespace gui {
class BackgroundPropertySection;
class EntityPropertySection;
class ToolPropertySection;
class EntityIntroPopup;
class ResourceLibraryDock;
}
namespace core::library {
class ResourceLibraryProvider;
class FakeResourceLibraryProvider;
class OnlineResourceLibraryProvider;
}

class MainWindow : public QMainWindow {
    Q_OBJECT
public:
    explicit MainWindow(QWidget* parent = nullptr);

protected:
    bool eventFilter(QObject* watched, QEvent* event) override;

private slots:
    
    // 文件菜单槽函数
    void onNewProject();
    void onOpenProject();
    void onSaveProject();
    void onCloseProject();
    
    // 编辑菜单槽函数
    void onUndo();
    void onRedo();
    void onCopyObject();
    void onPasteObject();
    
    // 帮助菜单槽函数
    void onAbout();
    void onComputeDepth();
    void onTogglePlay(bool on);
    void onInsertCombinedKey();  // 位置 + userScale

    void onProjectTreeItemClicked(QTreeWidgetItem* item, int column);

private:
    void computeDepthAsync();
    // UI 状态分三种：
    // - Welcome：未打开项目。只显示欢迎页，其它 dock 一律隐藏，视图开关禁用。
    // - Editor：已打开项目。显示编辑页，按默认规则显示 dock，同时允许用户通过“视图”菜单控制。
    // - Preview：预览展示。用于全流程完成后的展示（要求：项目已打开且背景不为空）。
    enum class UiMode { Welcome, Editor, Preview };

    void createMenus();         // 菜单和工具栏
    void createFileMenu();      // 文件菜单
    void createEditMenu();      // 编辑菜单
    void createHelpMenu();      // 帮助菜单
    void createViewMenu();      // 视图菜单
    void createWindowMenu();    // 窗口菜单（资源库等）
    void createProjectTreeDock();
    void createTimelineDock();
    void createResourceLibraryDock();
    void refreshProjectTree();
    void updateUiEnabledState();     // 更新“可用性/勾选/默认显隐”，不要做业务逻辑
    void applyUiMode(UiMode mode);   // 统一控制 welcome/editor 两态的显隐策略
    UiMode currentUiMode() const;    // 根据 workspace 状态推导
    void syncCanvasViewMenuFromState();

    void showProjectRootContextMenu(const QPoint& globalPos);
    void showBackgroundContextMenu(const QPoint& globalPos);
    void rebuildCentralPages();
    void showWelcomePage();
    void showEditorPage();
    void showPreviewPage();
    void refreshWelcomeRecentList();
    void openProjectFromPath(const QString& dir);
    void refreshPreviewPage();
    void refreshEditorPage();
    void applyTimelineFromProject();
    void updateTimelineTracks();
    void refreshDopeSheet();
    void setPreviewRequested(bool preview);
    void syncPreviewPlaybackBar();

    QStackedWidget* m_centerStack = nullptr;
    QWidget* m_pageWelcome = nullptr;
    QTreeWidget* m_welcomeRecentTree = nullptr;
    QLabel* m_welcomeRecentEmptyLabel = nullptr;
    QWidget* m_pageEditor = nullptr;
    QWidget* m_canvasHost = nullptr;
    QFrame* m_floatingModeDock = nullptr;
    QFrame* m_floatingToolDock = nullptr;
    QComboBox* m_modeSelector = nullptr;
    QStackedWidget* m_propertyStack = nullptr;
    gui::BackgroundPropertySection* m_bgPropertySection = nullptr;
    gui::EntityPropertySection* m_entityPropertySection = nullptr;
    gui::ToolPropertySection* m_toolPropertySection = nullptr;
    QToolButton* m_btnCreateEntity = nullptr;
    ToolOptionPopup* m_createEntityPopup = nullptr;
    QToolButton* m_btnToggleDepthOverlay = nullptr;

    EditorCanvas* m_editorCanvas = nullptr;

    QTreeWidget* m_projectTree = nullptr;
    QDockWidget* m_dockProjectTree = nullptr;
    QDockWidget* m_dockProperties = nullptr;
    QDockWidget* m_dockTimeline = nullptr;
    QDockWidget* m_dockResourceLibrary = nullptr;
    QTreeWidgetItem* m_itemBackground = nullptr;

    QAction* m_actionUndo = nullptr;
    QAction* m_actionRedo = nullptr;
    QAction* m_actionCopy = nullptr;
    QAction* m_actionPaste = nullptr;
    QAction* m_actionToggleProjectTree = nullptr;
    QAction* m_actionToggleProperties = nullptr;
    QAction* m_actionToggleTimeline = nullptr;
    QAction* m_actionToggleResourceLibrary = nullptr;
    QAction* m_actionEnterPreview = nullptr;
    QAction* m_actionBackToEditor = nullptr;
    QAction* m_actionCanvasWorldAxes = nullptr;
    QAction* m_actionCanvasAxisValues = nullptr;
    QAction* m_actionCanvasGrid = nullptr;
    QAction* m_actionCanvasCheckerboard = nullptr;
    QAction* m_actionCanvasDepthOverlay = nullptr;
    QAction* m_actionCanvasGizmoLabels = nullptr;

    core::ProjectWorkspace m_workspace;
    RecentProjectHistory m_recentHistory;
    bool m_previewRequested = false;
    /// 因右侧栏过窄自动收起；用户通过视图菜单再次打开时清除
    bool m_rightDocksNarrowHidden = false;

    QPointF m_lastWorldPos;
    int m_lastWorldZ = -1;
    bool m_hasSelectedEntity = false;
    bool m_hasSelectedTool = false;
    bool m_syncingTreeSelection = false;
    int m_selectedEntityDepth = 0;
    QPointF m_selectedEntityOrigin;
    QString m_selectedEntityId;
    QString m_selectedToolId;
    QString m_selectedEntityDisplayNameCache;
    QString m_bgAbsCache;
    QString m_bgSizeTextCache;
    // 项目树“眼睛”：仅用于画布临时隐藏（不持久化、不进时间轴）
    QSet<QString> m_tempHiddenEntityIds;
    QSet<QString> m_tempHiddenToolIds;
    void updateStatusBarText();
    void syncCreateEntityToolButtonTooltip();
    void refreshPropertyPanel();
    void refreshEntityPropertyPanelFast();
    void syncProjectTreeFromCanvasSelection();

    bool m_timelineScrubbing = false;
    bool m_entityDragging = false;
    QTimer* m_propertySyncTimer = nullptr;

    int m_currentFrame = 0;
    bool m_playing = false;
    QTimer* m_playTimer = nullptr;
    TimelineWidget* m_timeline = nullptr;
    QToolButton* m_btnPlay = nullptr;
    QComboBox* m_schemeSelector = nullptr;
    // 时间轴区间选择（用于逐帧贴图动画）
    int m_timelineRangeStart = -1;
    int m_timelineRangeEnd = -1;
    QCheckBox* m_chkAutoKeyframe = nullptr;
    // 旧版 DopeSheet 已移除，这里保留占位便于后续扩展区间 UI（如自定义小部件）
    QTreeWidget* m_dopeTree = nullptr;
    QPushButton* m_btnDopeDeleteKey = nullptr;

    gui::EntityIntroPopup* m_entityIntroPopup = nullptr;
    QFrame* m_previewPlaybackBar = nullptr;
    QToolButton* m_previewBtnPlay = nullptr;
    QToolButton* m_previewBtnPause = nullptr;

    gui::ResourceLibraryDock* m_resourceLibraryDockWidget = nullptr;
    core::library::ResourceLibraryProvider* m_resourceLibraryProvider = nullptr;
};