#pragma once

#include "Item.h"
#include "CurveNodeDrawer.h"
#include "IntersectionEraser.h"
#include "DrawOperator/RTree.h"

class CItemEraser : public CItem
{
public:
	CItemEraser(CSigmaDoc* ppDoc);
	~CItemEraser();

	void OnLButtonDblClk(UINT nFlags, CPoint point) override;
	void OnLButtonDown(CDC *pDC, UINT nFlags, CPoint point, int vk) override;
	void OnLButtonUp(CDC* pDC, UINT nFlags, CPoint point, int vk) override;
	void OnRButtonDown(UINT nFlags, CPoint point) override;
	BOOL OnRButtonUp(UINT nFlags, CPoint point) override;
	void OnMouseWheel(uint32_t button, int32_t clicks, int32_t x, int32_t y, int32_t delta) override;
	int OnMouseMove(CDC* pDC, UINT nFlags, CPoint point) override;
	void DrawAssistant(CDC* pDC, int mouseX, int mouseY) override;//图件屏幕重绘后，重绘临时线
	BOOL OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags) override;
	BOOL OnKeyUp(UINT nChar, UINT nRepCnt, UINT nFlags) override;
	void OnDraw(CXyDC* pXyDC, CDC* pDC) override;

	void OnCancel(void) override;

	EraserMode GetEraserMode() const;

	void SetEraserMode(EraserMode mode);

	int GetEraserRadius() const;

	void SetEraserRadius(int radius);

private:
	std::vector<CPoint> GetScreenPoints(const std::vector<CPoint2D>& points) const;

	void ZoomEraseRadius(int radius);

	void DrawCircle(CDC* pDC, int centerX, int centerY, int radius);

	/**
	 * 绘制橡皮擦
	 * 
	 * \param dc		CDC 对象
	 * \param centerX	橡皮擦中心位置 X 坐标
	 * \param centerY	橡皮擦中心位置 X 坐标
	 * \param radius
	 */
	void DrawEraser(CDC* pDC, int centerX, int centerY, int radius);

	/**
	 * 绘制曲线上的节点，方便用户操作
	 * 
	 * \param dc
	 */
	void DrawCurveNode(CDC* pDC);

	int m_lastX = -1;
	int m_lastY = -1;
	int m_lastRadius = -1;

	void ResetLast(int x, int y, int radius);

	static constexpr int ZOOM_VALUE = 10;
	static constexpr int MIN_ERASE_RADIUS = 10;
	static constexpr int MAX_ERASE_RADIUS = 40;

	// 右键点击去除曲线点时的最大搜索范围，在这个范围内我们就认为被点中了
	static constexpr double MAX_SEARCH_RADIUS = 2;

	RTree<POSITION, double, 2>* GetSpatialTree();

	/**
	 * 获取橡皮擦路径
	 * 
	 * \return 
	 */
	std::unique_ptr<CCurveEx> GetEraserPath() const;

	void SetAction(const CPositionList& plAdd, const CPositionList& plDel);

	void Erase();

	void Redraw();

	const CString redraw = "redraw";
	bool m_start = false;
	std::vector<CPoint2D> m_path;
	COLORREF m_penColor = RGB(255, 0, 0);
	int m_eraseRadius = 10;	// 删除半径
	EraserMode m_mode = EraserMode::Nodes;
	std::unique_ptr<CurveNodeDrawer> m_nodeDrawer;
	std::optional<std::pair<CRect, CRect8>> m_lastView;

	std::unique_ptr<RTree<POSITION, double, 2>> m_rtree;
	bool isViewChanged = true;
	size_t m_token = 0;
};