from machine import Pin

class Encoder:
    _increment_grid = [[0, -1, 1, None],
                       [1, 0, None, -1],
                       [-1, None, 0, 1],
                       [None, 1, -1, 0]]

    @property
    def total_change(self):
        return self._total_change

    def __init__(self, channel_a, channel_b):
        self.channel_a = self._configure_channel(channel_a)
        self.reset()

    def disable(self):
        self.channel_a.irq(None)

    def enable(self):
        self.channel_a.irq(self._irq_cb, trigger=Pin.IRQ_RISING)

    def reset(self):
        self._total_change = 0

    def _irq_cb(self, input_pin):
        self._total_change += 1

    def _configure_channel(self, pin):
        p = pin if isinstance(pin, Pin) else Pin(pin, Pin.IN, pull=Pin.PULL_UP)
        p.irq(self._irq_cb, trigger=Pin.IRQ_RISING)
        return p