#pragma once

enum class lcDragState
{
	None,
	Piece,
	Color
};

enum class lcCursor
{
	Default,
	Brick,
	Light,
	Spotlight,
	Camera,
	Select,
	SelectAdd,
	SelectRemove,
	Move,
	Rotate,
	RotateX,
	RotateY,
	Delete,
	Paint,
	ColorPicker,
	Zoom,
	ZoomRegion,
	Pan,
	Roll,
	RotateView,
	Count
};

enum class lcTrackButton
{
	None,
	Left,
	Middle,
	Right
};

class lcGLWidget
{
public:
	lcGLWidget();
	virtual ~lcGLWidget();

	lcGLWidget(const lcGLWidget&) = delete;
	lcGLWidget& operator=(const lcGLWidget&) = delete;

	lcCamera* GetCamera() const
	{
		return mCamera;
	}

	bool IsTracking() const
	{
		return mTrackButton != lcTrackButton::None;
	}

	int GetMouseX() const
	{
		return mMouseX;
	}

	int GetMouseY() const
	{
		return mMouseY;
	}

	void SetMousePosition(int MouseX, int MouseY);
	void SetMouseModifiers(Qt::KeyboardModifiers MouseModifiers);
	void SetContext(lcContext* Context);
	void MakeCurrent();
	void Redraw();
	void SetCursor(lcCursor Cursor);

	lcVector3 ProjectPoint(const lcVector3& Point) const;
	lcVector3 UnprojectPoint(const lcVector3& Point) const;
	void UnprojectPoints(lcVector3* Points, int NumPoints) const;
	lcMatrix44 GetProjectionMatrix() const;

	void DrawBackground() const;
	void DrawAxes() const;

	virtual void OnDraw() { }
	virtual void OnInitialUpdate() { }
	virtual void OnUpdateCursor() { }
	virtual void OnLeftButtonDown() { }
	virtual void OnLeftButtonUp() { }
	virtual void OnLeftButtonDoubleClick() { }
	virtual void OnMiddleButtonDown() { }
	virtual void OnMiddleButtonUp() { }
	virtual void OnRightButtonDown() { }
	virtual void OnRightButtonUp() { }
	virtual void OnBackButtonDown() { }
	virtual void OnBackButtonUp() { }
	virtual void OnForwardButtonDown() { }
	virtual void OnForwardButtonUp() { }
	virtual void OnMouseMove() { }
	virtual void OnMouseWheel(float Direction) { Q_UNUSED(Direction); }
	virtual void BeginDrag(lcDragState DragState) { Q_UNUSED(DragState); }
	virtual void EndDrag(bool Accept) { Q_UNUSED(Accept); }

	int mWidth = 1;
	int mHeight = 1;
	QGLWidget* mWidget = nullptr;
	lcContext* mContext = nullptr;

protected:
	int mMouseX = 0;
	int mMouseY = 0;
	int mMouseDownX = 0;
	int mMouseDownY = 0;
	Qt::KeyboardModifiers mMouseModifiers = Qt::NoModifier;

	lcTrackButton mTrackButton = lcTrackButton::None;
	lcCursor mCursor = lcCursor::Default;

	std::unique_ptr<lcScene> mScene;

	lcCamera* mCamera = nullptr;
	bool mDeleteContext = true;
};