from typing import Optional


class GPIO:
    BCM = 1
    IN = 1
    OUT = 2
    LOW = 0
    HIGH = 1

    class PWM:
        def __init__(self, pin, freq):
            self.pin = pin
            self.freq = freq
            self.dc: Optional[float] = None
            self.name = None

        def start(self, dc: float):
            self.dc = dc

        def ChangeDutyCycle(self, dc):
            self.dc = dc
            print(f'[{self.pin}@{self.freq}Hz]{" " + self.name if self.name else ""} => {self.dc}')

        def stop(self):
            print("stop pwm")

    @staticmethod
    def setup(pin, mode):
        print(f"setup {pin} -> {mode}")

    @staticmethod
    def output(pin, value):
        print(f"output {pin} -> {value}")

    @staticmethod
    def setmode(mode):
        print(f"setmode {mode}")

    @staticmethod
    def cleanup():
        print("cleanup")