import smbus

SINGLE_ENDED = 0x84
ADDRESS = 0x48

bus = smbus.SMBus(1)


class ADC:

    @staticmethod
    def read(channel) -> float:
        """
        Read from adc channel
        0 -> Left IR Sensor
        1 -> Right IR Sensor
        2 -> Battery voltage / 3
        :param channel: Channel between 0 and 2
        :return: voltage
        """

        """Select the Command data from the given provided value above"""
        command = SINGLE_ENDED | ((((channel << 2) | (channel >> 1)) & 0x07) << 4)
        bus.write_byte(ADDRESS, command)

        while "Koka is great":
            value1 = bus.read_byte(ADDRESS)
            value2 = bus.read_byte(ADDRESS)
            if value1 == value2:
                break

        voltage = value1 / 255.0 * 3.3  # calculate the voltage value
        voltage = round(voltage, 2)

        return voltage