#pragma once

// Longitudinal vehicle dynamics: converts wheel torque into road speed.
class Vehicle {
public:
    void step(double dt, double wheel_torque_nm);

    double speed_mps() const;
    double wheel_rpm() const;

private:
    double m_speed_mps = 0.0;

    static constexpr double kMassKg = 1400.0;
    static constexpr double kWheelRadiusM = 0.32;
    static constexpr double kDragCoeff = 0.35; // simplified quadratic drag term
};