from collections import namedtuple
import pytest

from .. import breadcrumbs as b


@pytest.fixture
def nested_crumbs():
    x = b.Crumb('nc.x', label='x')
    y = b.Crumb('nc.y', label='y', parent='nc.x')
    z = b.Crumb('nc.z', label='z', parent='nc.y')
    crumbs = (x, y, z)

    for crumb in crumbs:
        b.breadcrumbs[crumb.route] = crumb
    yield namedtuple('NestedCrumbs', 'x y z')(*crumbs)
    for crumb in crumbs:
        del b.breadcrumbs[crumb.route]


@pytest.fixture
def crumb_match(nested_crumbs):
    return namedtuple('Match', 'view_name')(nested_crumbs.z.route)


class TestAdd:
    def test_inserts_a_breadcrumb_without_parent(self):
        route = 'tests.add.insert'
        assert route not in b.breadcrumbs
        b.add(route, 'some label')
        assert route in b.breadcrumbs
        assert b.breadcrumbs[route] == route
        route = b.breadcrumbs[route]
        assert route.label == 'some label'
        assert route.parent is None

    def test_inserts_a_breadcrumb_with_parent(self):
        route = 'tests.add.with_parent'
        parent = 'tests.add.insert'
        assert route not in b.breadcrumbs
        b.add(route, 'child label', parent)
        assert route in b.breadcrumbs
        assert b.breadcrumbs[route] == route
        route = b.breadcrumbs[route]
        assert route.label == 'child label'
        assert route.parent == parent


class TestFind:
    def test_finds_chain_of_crumbs(self, nested_crumbs, crumb_match):
        crumbs = b.find(crumb_match)
        assert len(crumbs) == 3
        assert crumbs[0] == nested_crumbs.x
        assert crumbs[1] == nested_crumbs.y
        assert crumbs[2] == nested_crumbs.z