#pragma once

// Crankshaft rotational dynamics. Placeholder physics for now —
// real combustion/friction torque modeling comes later.
class Engine {
public:
    // load_torque_nm is the resistance fed back from the transmission
    // (via the vehicle), opposing crank rotation.
    void step(double dt, double load_torque_nm);

    double rpm() const;
    double torque_nm() const; // net torque produced this step

    void reset();

private:
    double m_rpm = 0.0;
    double m_torque_nm = 0.0;

    static constexpr double kIdleRpm = 900.0;
    static constexpr double kCrankInertiaKgm2 = 0.15; // placeholder
};