from compLib.ADC import ADC

BATTERY_CHANNEL = 2
BATTERY_COUNT = 2
BATTERY_MULTIPLIER = 3
BATTERY_MIN_VOLTAGE = 3.6
BATTERY_MAX_VOLTAGE = 4.1

adc = ADC()


class Battery(object):
    """Used to interact with the battery
    """

    @staticmethod
    def percent() -> int:
        """Get battery percentage

        :return: Percentage between 0 and 100
        :rtype: int
        """
        voltage = adc.read(BATTERY_CHANNEL) * BATTERY_MULTIPLIER
        return int((voltage - BATTERY_MIN_VOLTAGE) / BATTERY_MAX_VOLTAGE * 100)