# vim: set fileencoding=utf-8 :

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from radialnet.core.Coordinate import CartesianCoordinate
from radialnet.util.geometry import normalize_angle
import math


def ipv4_compare(ip1, ip2):
    """
    """
    ip1 = [int(i) for i in ip1.split('.')]
    ip2 = [int(i) for i in ip2.split('.')]

    for i in range(4):

        if ip1[i] != ip2[i]:

            if ip1[i] < ip2[i]:
                return -1

            else:
                return 1

    return 0


def swap(list, a, b):
    """
    """
    list[a], list[b] = list[b], list[a]


def sort_children(children, father):
    """
    """
    if len(children) < 2:
        return children

    # create angle reference
    f_x, f_y = father.get_cartesian_coordinate()

    for child in children:

        c_x, c_y = child.get_cartesian_coordinate()
        _, angle = CartesianCoordinate(c_x - f_x, c_y - f_y).to_polar()

        child.set_draw_info({'angle_from_father': math.degrees(angle)})

    return sort_children_by_angle(children)


def sort_children_by_angle(children):
    """
    """

    vector = list(children)
    vector.sort(
            key=lambda c: normalize_angle(
                c.get_draw_info('angle_from_father')))
    return vector