//
// Created by dawsh on 1/25/24.
//

#pragma once

#include <J3ML/LinearAlgebra/Vector3.h>
#include <vector>
#include "TriangleMesh.h"
#include "Frustum.h"
#include "OBB.h"

namespace J3ML::Geometry
{
    using J3ML::LinearAlgebra::Vector3;


    // RaycastResult structure containing the first object the ray collides with,
    // the surface intersection point,
    // and the surface normal at the point of intersection.
    struct RaycastResult
    {
        Vector3 Intersection;
        Vector3 SurfaceNormal;
        bool Hit;
        Shape* Target;
        static RaycastResult NoHit() { return {Vector3::NaN, Vector3::NaN, false, nullptr};}
    };

    // A ray in 3D space is a line that starts from an origin point and extends to infinity in one direction
    class Ray
    {
    public:
        // The position of this ray.
        Vector3 Origin;
        // The normalized direction vector of this ray.
        // @note: For proper functionality, this direction vector needs to always be normalized
        Vector3 Direction;
        Ray() {}
        Ray(const Vector3& pos, const Vector3& dir);
        //explicit Ray(const Line& line);
        explicit Ray(const LineSegment& lineSegment);
        bool IsFinite() const;
        Vector3 GetPoint(float distance) const;
        RaycastResult Cast(const Triangle& target, float maxDistance = 99999999);
        RaycastResult Cast(const Plane& target, float maxDistance = 99999999);
        RaycastResult Cast(const AABB& target, float maxDistance = 99999999);
        // https://gdbooks.gitbooks.io/3dcollisions/content/Chapter3/raycast_sphere.html
        RaycastResult Cast(const Sphere& target, float maxDistance = 99999999);
        RaycastResult Cast(const OBB& target, float maxDistance = 99999999);
        RaycastResult Cast(const Capsule& target, float maxDistance = 99999999);
        RaycastResult Cast(const Frustum& target, float maxDistance = 99999999);
        RaycastResult Cast(const TriangleMesh& target, float maxDistance = 9999999);

        // Returns a RaycastResult structure containing the first object the ray collides with,
        // the surface intersection point,
        // and the surface normal at the point of intersection.
        RaycastResult Cast(std::vector<Shape> shapes, float maxDistance = 99999999);
    };
}