import pytest

from clusterview.points import Attribute, PointSet


def test_add_to_point_set():
    l = PointSet()

    l.add_point(1, 2)

    points = list(l.points)

    assert len(points) == 1
    assert points[0] == (1, 2)
    assert len(l.attributes(1, 2)) == 0

def test_add_to_point_set_with_attributes():
    attribute = Attribute("thing", 1)

    l = PointSet()
    l.add_point(1, 2, attrs=[attribute])

    points = list(l.points)
    attrs = l.attributes(1, 2)

    assert len(points) == 1
    assert points[0] == (1, 2)
    assert len(l.attributes(1, 2)) == 1

def test_remove_point():
    attribute = Attribute("thing", 1)

    l = PointSet()
    l.add_point(1, 2, attrs=[attribute])

    l.remove_point(1, 2)

    points = list(l.points)

    assert len(points) == 0

    with pytest.raises(KeyError):
        # We expect a call to attributes on a removed
        # point to raise a KeyError because it no
        # longer exists in the point -> attribute_list
        # dictionary.
        l.attributes(1, 2)

def test_attributes_must_be_array_of_attributes():
    with pytest.raises(ValueError):
        l = PointSet()
        l.add_point(1, 2, attrs=[1,2,3,4,5])