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