engine script

using System;
using UnityEngine;

[Serializable]
public class Engine : MonoBehaviour
{
    //defaults based on 2024 5.0L V8 Ford Coyote engine
    public float idleRPM = 700f; // RPM at idle
    public float maxRPM = 7500f; // RPM at redline
    public float[] gearRatios = { 4.696f, 2.985f, 2.146f, 1.769f, 1.520f, 1.275f, 1f, 0.854f, 0.689f, 0.636f }; // 10 speed automatic
    public float finalDriveRatio = 3.15f;
    public float transmissionEfficiency = 0.85f; // percentage of engine torque that actually reaches the wheels
    public AnimationCurve torqueCurve;
    public bool automatic = true;
    public int gear {private set; get;} = 0; // 0 is 1st
    public float rpm {private set; get;} = 0f;

    private int prevGear = -1; // avoid quick gear drop
    private float lastShiftTime = 0f;
    private float shiftCooldown = 1f;
    private bool shifting = false;
    private float gearShiftTime = 0.15f; // time it takes transmission to shift gears, mustang is a bit slow

    private bool engineOn = false;

    public void StartEngine()
    {
        engineOn = true;
        rpm = idleRPM;
    }

    public void SetRPM(float newRPM)
    {
        if (!engineOn) return;

        rpm = Mathf.Clamp(newRPM, idleRPM, maxRPM);
    }

    public float GetTorque(float wheelRadius, float throttle)
    {
        // always at max torque for now. Change to be maxTorque(rpm) * throttle input later
        float maxTorqueAtRPM = torqueCurve.Evaluate(rpm);
        float totalGearRatio = gearRatios[gear] * finalDriveRatio;
        float wheelTorque = maxTorqueAtRPM * totalGearRatio * throttle;
        return wheelTorque * transmissionEfficiency / wheelRadius;
    }
}