import glob
import os
import re

from lxml import etree

import inventory_provider

TEST_DATA_DIRNAME = os.path.realpath(os.path.join(
    inventory_provider.__path__[0],
    "..",
    "test",
    "data"))


def pytest_generate_tests(metafunc):

    def _junosspace_hosts():
        filename = os.path.join(TEST_DATA_DIRNAME, "junosspace-devices.xml")
        with open(filename) as f:
            doc = etree.fromstring(f.read().encode('utf-8'))
            for name in doc.xpath('//devices/device/name/text()'):
                m = re.match(r'^(mx[12].*)\.re0', name)
                if m:
                    yield m.group(1) + '.geant.net'

    # TODO: can we really not get netconf data for all routers?
    def _available_netconf_hosts():
        for fn in glob.glob(os.path.join(TEST_DATA_DIRNAME, '*-netconf.xml')):
            m = re.match('(.*)-netconf.xml', os.path.basename(fn))
            assert m  # sanity
            yield m.group(1)

    routers = list(set(_junosspace_hosts()) & set(_available_netconf_hosts()))
    metafunc.parametrize("router", routers)