#pragma once
#include "raylib.h"
#include "Vec3.hpp"
#include "Planet.hpp"

// Mouse-picking helpers: ray from the 3D viewport, sphere intersection, nearest
// cell to a direction, and angular distance between two unit directions.

// Custom camera ray for the 3D viewport (GetScreenToWorldRay assumes the full
// screen; the globe occupies only the top-left quadrant).
Vec3 rayDirFromMouse(Vector3 pos, Vector3 target, float fovyDeg,
                     float mx, float my, float vw, float vh);
bool raySphere(Vec3 o, Vec3 d, double R, Vec3& hitUnit);
int  nearestCell(const Planet& p, const Vec3& dir);
double angBetween(const Vec3& a, const Vec3& b);

// Rotate v by `deg` degrees CCW about the world +Z axis (matches rlRotatef(deg,0,0,1)).
// Used for the axial-tilt transform: +tilt maps model->world, -tilt world->model.
Vec3 rotateZ(const Vec3& v, double deg);