"""Utility functions for the driver."""
import socket
import struct
import time


def get_public_ip_address():
    """Find the public IP Address of the host device."""
    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    sock.connect(("8.8.8.8", 80))
    ip_address = sock.getsockname()[0]
    sock.close()
    return ip_address


def int_to_float16(int_to_convert):
    """Convert integer into float16 representation."""
    bin_rep = ('0' * 16 + '{0:b}'.format(int_to_convert))[-16:]
    sign = 1.0
    if int(bin_rep[0]) == 1:
        sign = -1.0
    exponent = float(int(bin_rep[1:6], 2))
    fraction = float(int(bin_rep[6:17], 2))

    if exponent == float(0b00000):
        return sign * 2 ** -14 * fraction / (2.0 ** 10.0)
    elif exponent == float(0b11111):
        if fraction == 0:
            return sign * float("inf")
        return float("NaN")
    frac_part = 1.0 + fraction / (2.0 ** 10.0)
    return sign * (2 ** (exponent - 15)) * frac_part


def ints_to_float(int1, int2):
    """Convert 2 registers into a floating point number."""
    mypack = struct.pack('>HH', int1, int2)
    f_unpacked = struct.unpack('>f', mypack)
    print("[{}, {}] >> {}".format(int1, int2, f_unpacked[0]))
    return f_unpacked[0]


def degf_to_degc(temp_f):
    """Convert deg F to deg C."""
    return (temp_f - 32.0) * (5.0/9.0)


def degc_to_degf(temp_c):
    """Convert deg C to deg F."""
    return temp_c * 1.8 + 32.0


class Every(object):
    """Class that runs a specific method every so often."""
    
    def __init__(self, func, seconds, run_at_start=True):
        self.func = func
        self.seconds = seconds
        self.last_run = time.time()
        if run_at_start:
            self.check(force=True)

    def check(self, force=False):
        """Check to see if the function needs to be run."""
        now = time.time()
        if ((now - self.last_run) > self.seconds) or force:
            self.last_run = now
            return self.func()
        return None