"""
Tests for django.core.servers.
"""
import os
import urllib2

from django.core.exceptions import ImproperlyConfigured
from django.test import LiveServerTestCase
from django.core.servers.basehttp import WSGIServerException
from django.test.utils import override_settings

from .models import Person


TEST_ROOT = os.path.dirname(__file__)
TEST_SETTINGS = {
    'MEDIA_URL': '/media/',
    'MEDIA_ROOT': os.path.join(TEST_ROOT, 'media'),
    'STATIC_URL': '/static/',
    'STATIC_ROOT': os.path.join(TEST_ROOT, 'static'),
}


class LiveServerBase(LiveServerTestCase):
    urls = 'regressiontests.servers.urls'
    fixtures = ['testdata.json']

    @classmethod
    def setUpClass(cls):
        # Override settings
        cls.settings_override = override_settings(**TEST_SETTINGS)
        cls.settings_override.enable()
        super(LiveServerBase, cls).setUpClass()

    @classmethod
    def tearDownClass(cls):
        # Restore original settings
        cls.settings_override.disable()
        super(LiveServerBase, cls).tearDownClass()

    def urlopen(self, url):
        return urllib2.urlopen(self.live_server_url + url)


class LiveServerAddress(LiveServerBase):
    """
    Ensure that the address set in the environment variable is valid.
    Refs #2879.
    """

    @classmethod
    def setUpClass(cls):
        # Backup original environment variable
        address_predefined = 'DJANGO_LIVE_TEST_SERVER_ADDRESS' in os.environ
        old_address = os.environ.get('DJANGO_LIVE_TEST_SERVER_ADDRESS')

        # Just the host is not accepted
        cls.raises_exception('localhost', ImproperlyConfigured)

        # The host must be valid
        cls.raises_exception('blahblahblah:8081', WSGIServerException)

        # The list of ports must be in a valid format
        cls.raises_exception('localhost:8081,', ImproperlyConfigured)
        cls.raises_exception('localhost:8081,blah', ImproperlyConfigured)
        cls.raises_exception('localhost:8081-', ImproperlyConfigured)
        cls.raises_exception('localhost:8081-blah', ImproperlyConfigured)
        cls.raises_exception('localhost:8081-8082-8083', ImproperlyConfigured)

        # If contrib.staticfiles isn't configured properly, the exception
        # should bubble up to the main thread.
        old_STATIC_URL = TEST_SETTINGS['STATIC_URL']
        TEST_SETTINGS['STATIC_URL'] = None
        cls.raises_exception('localhost:8081', ImproperlyConfigured)
        TEST_SETTINGS['STATIC_URL'] = old_STATIC_URL

        # Restore original environment variable
        if address_predefined:
            os.environ['DJANGO_LIVE_TEST_SERVER_ADDRESS'] = old_address
        else:
            del os.environ['DJANGO_LIVE_TEST_SERVER_ADDRESS']

    @classmethod
    def raises_exception(cls, address, exception):
        os.environ['DJANGO_LIVE_TEST_SERVER_ADDRESS'] = address
        try:
            super(LiveServerAddress, cls).setUpClass()
            raise Exception("The line above should have raised an exception")
        except exception:
            pass

    def test_test_test(self):
        # Intentionally empty method so that the test is picked up by the
        # test runner and the overriden setUpClass() method is executed.
        pass

class LiveServerViews(LiveServerBase):
    def test_404(self):
        """
        Ensure that the LiveServerTestCase serves 404s.
        Refs #2879.
        """
        try:
            self.urlopen('/')
        except urllib2.HTTPError as err:
            self.assertEquals(err.code, 404, 'Expected 404 response')
        else:
            self.fail('Expected 404 response')

    def test_view(self):
        """
        Ensure that the LiveServerTestCase serves views.
        Refs #2879.
        """
        f = self.urlopen('/example_view/')
        self.assertEquals(f.read(), 'example view')

    def test_static_files(self):
        """
        Ensure that the LiveServerTestCase serves static files.
        Refs #2879.
        """
        f = self.urlopen('/static/example_static_file.txt')
        self.assertEquals(f.read(), 'example static file\n')

    def test_media_files(self):
        """
        Ensure that the LiveServerTestCase serves media files.
        Refs #2879.
        """
        f = self.urlopen('/media/example_media_file.txt')
        self.assertEquals(f.read(), 'example media file\n')


class LiveServerDatabase(LiveServerBase):

    def test_fixtures_loaded(self):
        """
        Ensure that fixtures are properly loaded and visible to the
        live server thread.
        Refs #2879.
        """
        f = self.urlopen('/model_view/')
        self.assertEquals(f.read().splitlines(), ['jane', 'robert'])

    def test_database_writes(self):
        """
        Ensure that data written to the database by a view can be read.
        Refs #2879.
        """
        self.urlopen('/create_model_instance/')
        self.assertQuerysetEqual(
            Person.objects.all().order_by('pk'),
            ['jane', 'robert', 'emily'],
            lambda b: b.name
        )