#pragma once

#include <numeric>
#include <limits>
#include <cmath>
#include <vector>

template<typename T>
class Vec3 {
public:
    T a, b, c;

	Vec3( T x=T(), T y=T(), T z =T()):a(x),b(y),c(z){}//修改后代码

    T operator[](int i) const {
        if (i == 0) {
            return a;
        } else if (i == 1) {
            return b;
        } else if (i == 2) {
            return c;
        }
        return a;
    }

    T &operator[](int i) {
        if (i == 0) {
            return a;
        } else if (i == 1) {
            return b;
        } else if (i == 2) {
            return c;
        }
        return a;
    }

//    Vec3 operator+(const Vec3 &other) const {
//        return {a + other.a, b + other.b, c + other.c};
//    }
    Vec3 operator+(const Vec3 &other) const {
        return Vec3(a + other.a, b + other.b, c + other.c);
    }//VS2008


//    Vec3 operator/(const float w) const {
//        return {a / w, b / w, c / w};
//    }
	Vec3 operator/(const float w) const {
       return Vec3(a / w, b / w, c / w);
    }//VS2008

//    Vec3 operator-(const Vec3 &other) const {
//        return {a - other.a, b - other.b, c - other.c};
//    }
	Vec3 operator-(const Vec3 &other) const {
         return Vec3(a - other.a, b - other.b, c - other.c);
    }//VS2008

//    Vec3 operator*(const float &w) const {
//        return {a * w, b * w, c * w};
//    }
	Vec3 operator*(const float &w) const {
        return Vec3(a * w, b * w, c * w);
    }//VS2008

    float length() const {
        return sqrt(a * a + b * b + c * c);
    }

    Vec3 norm() const {
        return *this / length();
    }

//    Vec3 cross(const Vec3 &other) const {
//        return {b * other.c - c * other.b, c * other.a - a * other.c, a * other.b - b * other.a};
//    }
	Vec3 cross(const Vec3 &other) const {
         return Vec3(b * other.c - c * other.b, c * other.a - a * other.c, a * other.b - b * other.a);
    }

    float dot(const Vec3 &other) const {
        return a * other.a + b * other.b + c * other.c;
    }
};

typedef Vec3<float> Vec3f;
typedef Vec3<unsigned int> Vec3u;

class Mesh {
public:
	std::vector<Vec3f> vertices;
    std::vector<Vec3u> indices;

};

class AABB {
public:
    Vec3f min, max;
/*
	AABB()
		:min(std::numeric_limits<float>::max(), std::numeric_limits<float>::max(),std::numeric_limits<float>::max()),
		max(std::numeric_limits<float>::min(), std::numeric_limits<float>::min(),std::numeric_limits<float>::min())
	{}
*/
	AABB()
	{
		min= Vec3f(1e5,1e5,1e5);
		max= Vec3f(0,0,0);
	}
};

class LineSegment {
public:
    Vec3f start;
    Vec3f end;

//    LineSegment(const Vec3f &s, const Vec3f &e) : start(s), end(e) {
//        length = (end - start).length();
//        dir = (end - start).norm();
//    }
	LineSegment(const Vec3f &s, const Vec3f &e):start(s), end(e) {
		calculate();
	}

    float getLength() const {
        return length;
    }

    Vec3f getDir() const {
        return dir;
    }

//private:
    float length;
    Vec3f dir;
	void calculate(){//VS2008
	Vec3f diff =end-start;//VS2008
	length =diff.length();//VS2008
	dir=diff.norm();//VS2008
	}//VS2008
};

struct FaceCenterComparator {  
    const std::vector<Vec3f>& faceCenters; // 替换 YourVectorType 为你的向量类型  
    int longAxis;  
  
    FaceCenterComparator(const std::vector<Vec3f>& centers, int axis)  
        : faceCenters(centers), longAxis(axis) {}  
  
    bool operator()(const size_t& a, const size_t& b) const {  
        return faceCenters[a][longAxis] < faceCenters[b][longAxis];  
    }  
};