import time

start = time.monotonic()
last_message = None
threshold = 5

def check(data, emit):
    "Checks if the fuel ratio is below a certain threshold"
    global last_message
    if "FuelRatio" not in data:
        return

    ratio = data["FuelRatio"]
    if ratio <= threshold:
        if last_message is None:
            emit("switchPlugin", {
                "plugin": "warning",
                "data": {
                    "title": "Low Fuel",
                    "description": f"Only {int(ratio)}% fuel left. Please refill the tank."
                },
                "time": 5000
            })
            last_message = time.monotonic()
    else:
        last_message = None