from __future__ import unicode_literals

from io import BytesIO
from xml.dom import minidom
import warnings
import zipfile

from django.conf import settings
from django.contrib.gis.geos import HAS_GEOS
from django.contrib.sites.models import Site
from django.test import (
    TestCase, modify_settings, override_settings, skipUnlessDBFeature
)
from django.utils.deprecation import RemovedInDjango20Warning

if HAS_GEOS:
    from .models import City, Country


@modify_settings(INSTALLED_APPS={'append': ['django.contrib.sites', 'django.contrib.sitemaps']})
@override_settings(ROOT_URLCONF='django.contrib.gis.tests.geoapp.urls')
@skipUnlessDBFeature("gis_enabled")
class GeoSitemapTest(TestCase):

    def setUp(self):
        super(GeoSitemapTest, self).setUp()
        Site(id=settings.SITE_ID, domain="example.com", name="example.com").save()

    def assertChildNodes(self, elem, expected):
        "Taken from syndication/tests.py."
        actual = set(n.nodeName for n in elem.childNodes)
        expected = set(expected)
        self.assertEqual(actual, expected)

    def test_geositemap_kml(self):
        "Tests KML/KMZ geographic sitemaps."
        for kml_type in ('kml', 'kmz'):
            with warnings.catch_warnings():
                warnings.filterwarnings("ignore", category=RemovedInDjango20Warning)
                # The URL for the sitemaps in urls.py have been updated
                # with a name but since reversing by Python path is tried first
                # before reversing by name and works since we're giving
                # name='django.contrib.gis.sitemaps.views.(kml|kmz)', we need
                # to silence the erroneous warning until reversing by dotted
                # path is removed. The test will work without modification when
                # it's removed.
                doc = minidom.parseString(self.client.get('/sitemaps/%s.xml' % kml_type).content)

            # Ensuring the right sitemaps namespace is present.
            urlset = doc.firstChild
            self.assertEqual(urlset.getAttribute('xmlns'), 'http://www.sitemaps.org/schemas/sitemap/0.9')

            urls = urlset.getElementsByTagName('url')
            self.assertEqual(2, len(urls))  # Should only be 2 sitemaps.
            for url in urls:
                self.assertChildNodes(url, ['loc'])

                # Getting the relative URL since we don't have a real site.
                kml_url = url.getElementsByTagName('loc')[0].childNodes[0].data.split('http://example.com')[1]

                if kml_type == 'kml':
                    kml_doc = minidom.parseString(self.client.get(kml_url).content)
                elif kml_type == 'kmz':
                    # Have to decompress KMZ before parsing.
                    buf = BytesIO(self.client.get(kml_url).content)
                    zf = zipfile.ZipFile(buf)
                    self.assertEqual(1, len(zf.filelist))
                    self.assertEqual('doc.kml', zf.filelist[0].filename)
                    kml_doc = minidom.parseString(zf.read('doc.kml'))

                # Ensuring the correct number of placemarks are in the KML doc.
                if 'city' in kml_url:
                    model = City
                elif 'country' in kml_url:
                    model = Country
                self.assertEqual(model.objects.count(), len(kml_doc.getElementsByTagName('Placemark')))
