import digitalio
from micropython import const


class PinState:
    PRESSED: int = const(0)
    RELEASED: int = const(1)


class PinEvent:
    NO_EVENT: int = const(0)
    PRESSED: int = const(1)
    RELEASED: int = const(2)


class PinStates:
    current: int
    previous: int

    def __init__(self, current: int, previous: int):
        self.current = current
        self.previous = previous


class Pin:
    index: int
    hw_pin: digitalio.DigitalInOut

    def __init__(self, index, hw_pin: digitalio.DigitalInOut):
        self.index = index
        self.hw_pin = hw_pin
        self.previous_state = PinState.RELEASED

    def _consume_next_state(self) -> PinStates:
        states = PinStates(int(self.hw_pin.value), int(self.previous_state))
        self.previous_state = states.current
        return states

    def read_event(self) -> int:
        raise NotImplementedError()

    def get_value(self) -> int:
        return self.hw_pin.value