import pytest

from clusterview.points import Attribute, Point, PointSet


def test_empty():
    l = PointSet(3, 100, 100)

    assert l.empty()

def test_add_to_point_set():
    l = PointSet(3, 100, 100)

    l.add_point(1, 2)

    points = list(l.points)

    p = Point(1, 2, 3, 100, 100)
    assert len(points) == 1
    assert points[0] == p
    assert len(l.attributes(p)) == 0

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

    l = PointSet(3, 100, 100)
    l.add_point(2, 3, attrs=[attribute])

    points = list(l.points)
    point = Point(2, 3, 3, 100, 100)
    attrs = l.attributes(point)

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

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

    l = PointSet(8, 100, 100)
    l.add_point(4, 4, attrs=[attribute])

    p = Point(4, 4, 8, 100, 100)
    l.remove_point(4, 4)

    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(p)

def test_remove_point_bounding_box():
    """
    This test checks the bounding box hit heuristic.
    """
    attribute = Attribute("thing", 1)

    l = PointSet(8, 100, 100)
    l.add_point(4, 4, attrs=[attribute])

    p = Point(4, 4, 8, 100, 100)

    # The click-point (2, 1) will be inside of our point size 8
    # bounding box.
    l.remove_point(4, 4)

    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(p)

def test_attributes_must_be_array_of_attributes():
    with pytest.raises(ValueError):
        l = PointSet(8, 100, 100)
        l.add_point(4, 4, attrs=[1,2,3,4,5])

def test_clear_all_selected_points():
    l = PointSet(8, 100, 100)
    l.add_point(4, 4)
    l.add_point(5, 5)

    for p in l.points:
        p.select()

    selected = 0

    for p in l.points:
        if p.selected:
            selected += 1

    assert selected == 2

    l.clear_selection()

    unselected = 0

    for p in l.points:
        if not p.selected:
            unselected += 1

    assert unselected == 2