import math

class Engine:
    rpm = 0
    throttle = 0
    load = 0
    instant_torque = 0
    gear = 0
    flywheel_inertia = 0
    idle_rpm = 750
    max_rpm = 6500

    fuel_rate = 0
    afr = 0
    coolant_temp = 0
    oil_temp = 0

    ignition_timing = 0

    ambient_temp = 0
    altitude = 0
    intake_pressure = 0
    vehicle_mass = 0
    drivetrain_loss = 0

    oil_pressure = 0
    turbo_boost = 0
    kr = 0
    exhaust_temp = 0

    def start(self):
        rpm = 250
    
    def update(self, throttle, load, dt):
        
        if not self.running:
            return

        self.throttle = throttle
        self.load = load

        # Apply simplified engine RPM dynamics
        rpm_change = (throttle - load) * self.torque_curve(self.rpm) / self.flywheel_inertia
        self.rpm += rpm_change * dt
        self.rpm = max(self.idle_rpm, min(self.rpm, self.max_rpm))

        self.torque = self.torque_curve(self.rpm) * throttle
        self.fuel_rate = self.rpm * throttle * self.fuel_efficiency

        self._update_temps(dt)