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#pragma once
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#include "ItemCurve.h"
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#include <vector>
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#include <utility>
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/**
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* @brief 样条曲线数据模型
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*
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* 控制点为唯一数据源，通过段元数据生成渲染点。n 个控制点对应 n-1 段，
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* 渲染点带段索引用于绘制和命中检测，最终通过 ToCCurveEx() 输出供文档使用。
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*/
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/** @brief 段来源：Algorithm 由 Catmull-Rom 计算；Original 使用存储点 */
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enum class SegmentSource
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{
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Algorithm,
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Original
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};
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/** @brief 段元数据，存储该段采样点 */
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struct SegmentMeta
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{
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SegmentSource source = SegmentSource::Algorithm;
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std::vector<dfPoint> points;
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};
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/** @brief 渲染点，带所属段索引，用于绘制和命中检测 */
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struct RenderPointWithSeg
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{
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dfPoint point;
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int segIndex;
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};
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/**
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* @brief 样条曲线模型
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*
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* 数据流：控制点 → 段元数据 → 渲染点缓存 → CCurveEx
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*/
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class SplineCurveModel
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{
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public:
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explicit SplineCurveModel(int samplesPerSegment = 30);
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const std::vector<dfPoint>& GetControlPoints() const;
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std::vector<dfPoint>& GetControlPoints();
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const std::vector<SegmentMeta>& GetSegmentMeta() const;
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const std::vector<RenderPointWithSeg>& GetRenderPoints() const;
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int GetControlPointCount() const;
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int GetSegmentCount() const;
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bool IsValid() const;
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/**
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* @brief 在 index 处插入控制点，返回新索引，非法返回 -1
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*/
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int InsertControlPoint(int index, const dfPoint& point);
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/**
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* @brief 删除 index 处控制点，至少保留 3 个，返回是否成功
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*/
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bool RemoveControlPoint(int index);
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/** @brief 更新控制点坐标，仅重算受影响的段 */
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void UpdateControlPoint(int index, double x, double y);
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/**
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* @brief 重建渲染点缓存
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* @param affectedRange 仅重建此范围，nullptr 表示全量
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*/
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void RebuildRenderPoints(const std::pair<int, int>* affectedRange = nullptr);
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/**
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* @brief 从模型生成 CCurveEx，供文档/绘制使用
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*/
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void ToCCurveEx(CCurveEx& outCurve) const;
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/**
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* @brief 从 CCurveEx 初始化模型，使用 SplineAlgorithm 抽稀生成控制点
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*/
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bool InitFromCCurveEx(const CCurveEx& curve, double splineStep);
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int GetSamplesPerSegment() const;
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void SetSamplesPerSegment(int n);
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private:
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std::vector<dfPoint> m_controlPoints;
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std::vector<SegmentMeta> m_segmentMeta;
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std::vector<RenderPointWithSeg> m_renderPoints;
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int m_samplesPerSegment;
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void InitSegmentMeta();
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/**
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* Catmull-Rom 单段采样（4 控制点 p0..p3，绘制 p1→p2）
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*/
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static std::vector<dfPoint> SampleSegment(
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const dfPoint& p0, const dfPoint& p1, const dfPoint& p2, const dfPoint& p3,
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int samplesPerSegment);
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static std::pair<int, int> GetAffectedSegmentRange(int controlPointIndex, int segmentCount);
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};
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