from pybricks.iodevices import UARTDevice as _UARTDevice
from pybricks.tools import wait
from uerrno import ETIMEDOUT

class FakeUART:
    def __init__(self, port, baudrate, timeout):
        self.timeout = timeout
        print("Warning: No physical UART detected. Using simulator.")

    def read(self, length=1):
        if self.timeout is not None:
            wait(self.timeout)
            raise OSError(ETIMEDOUT)
        else:
            while True:
                wait(1000)

    def write(self, data):
        pass

def UARTDevice(port, baudrate=9600, timeout=None):
    try:
        return _UARTDevice(port, baudrate, timeout)
    except OSError:
        return FakeUART(port, baudrate, timeout)