from django.core.cache import cache
from django.template import Context, Engine, TemplateSyntaxError
from django.test import SimpleTestCase, override_settings

from ..utils import setup


class CacheTagTests(SimpleTestCase):
    libraries = {
        'cache': 'django.templatetags.cache',
        'custom': 'template_tests.templatetags.custom',
    }

    def tearDown(self):
        cache.clear()

    @setup({'cache03': '{% load cache %}{% cache 2 test %}cache03{% endcache %}'})
    def test_cache03(self):
        output = self.engine.render_to_string('cache03')
        self.assertEqual(output, 'cache03')

    @setup({
        'cache03': '{% load cache %}{% cache 2 test %}cache03{% endcache %}',
        'cache04': '{% load cache %}{% cache 2 test %}cache04{% endcache %}',
    })
    def test_cache04(self):
        self.engine.render_to_string('cache03')
        output = self.engine.render_to_string('cache04')
        self.assertEqual(output, 'cache03')

    @setup({'cache05': '{% load cache %}{% cache 2 test foo %}cache05{% endcache %}'})
    def test_cache05(self):
        output = self.engine.render_to_string('cache05', {'foo': 1})
        self.assertEqual(output, 'cache05')

    @setup({'cache06': '{% load cache %}{% cache 2 test foo %}cache06{% endcache %}'})
    def test_cache06(self):
        output = self.engine.render_to_string('cache06', {'foo': 2})
        self.assertEqual(output, 'cache06')

    @setup({
        'cache05': '{% load cache %}{% cache 2 test foo %}cache05{% endcache %}',
        'cache07': '{% load cache %}{% cache 2 test foo %}cache07{% endcache %}',
    })
    def test_cache07(self):
        context = {'foo': 1}
        self.engine.render_to_string('cache05', context)
        output = self.engine.render_to_string('cache07', context)
        self.assertEqual(output, 'cache05')

    @setup({
        'cache06': '{% load cache %}{% cache 2 test foo %}cache06{% endcache %}',
        'cache08': '{% load cache %}{% cache time test foo %}cache08{% endcache %}',
    })
    def test_cache08(self):
        """
        Allow first argument to be a variable.
        """
        context = {'foo': 2, 'time': 2}
        self.engine.render_to_string('cache06', context)
        output = self.engine.render_to_string('cache08', context)
        self.assertEqual(output, 'cache06')

    # Raise exception if we don't have at least 2 args, first one integer.
    @setup({'cache11': '{% load cache %}{% cache %}{% endcache %}'})
    def test_cache11(self):
        with self.assertRaises(TemplateSyntaxError):
            self.engine.get_template('cache11')

    @setup({'cache12': '{% load cache %}{% cache 1 %}{% endcache %}'})
    def test_cache12(self):
        with self.assertRaises(TemplateSyntaxError):
            self.engine.get_template('cache12')

    @setup({'cache13': '{% load cache %}{% cache foo bar %}{% endcache %}'})
    def test_cache13(self):
        with self.assertRaises(TemplateSyntaxError):
            self.engine.render_to_string('cache13')

    @setup({'cache14': '{% load cache %}{% cache foo bar %}{% endcache %}'})
    def test_cache14(self):
        with self.assertRaises(TemplateSyntaxError):
            self.engine.render_to_string('cache14', {'foo': 'fail'})

    @setup({'cache15': '{% load cache %}{% cache foo bar %}{% endcache %}'})
    def test_cache15(self):
        with self.assertRaises(TemplateSyntaxError):
            self.engine.render_to_string('cache15', {'foo': []})

    @setup({'cache16': '{% load cache %}{% cache 1 foo bar %}{% endcache %}'})
    def test_cache16(self):
        """
        Regression test for #7460.
        """
        output = self.engine.render_to_string('cache16', {'foo': 'foo', 'bar': 'with spaces'})
        self.assertEqual(output, '')

    @setup({'cache17': '{% load cache %}{% cache 10 long_cache_key poem %}Some Content{% endcache %}'})
    def test_cache17(self):
        """
        Regression test for #11270.
        """
        output = self.engine.render_to_string(
            'cache17',
            {
                'poem': (
                    'Oh freddled gruntbuggly/Thy micturations are to me/'
                    'As plurdled gabbleblotchits/On a lurgid bee/'
                    'That mordiously hath bitled out/Its earted jurtles/'
                    'Into a rancid festering/Or else I shall rend thee in the gobberwarts'
                    'with my blurglecruncheon/See if I dont.'
                ),
            }
        )
        self.assertEqual(output, 'Some Content')

    @setup({'cache18': '{% load cache custom %}{% cache 2|noop:"x y" cache18 %}cache18{% endcache %}'})
    def test_cache18(self):
        """
        Test whitespace in filter arguments
        """
        output = self.engine.render_to_string('cache18')
        self.assertEqual(output, 'cache18')

    @setup({
        'first': '{% load cache %}{% cache None fragment19 %}content{% endcache %}',
        'second': '{% load cache %}{% cache None fragment19 %}not rendered{% endcache %}'
    })
    def test_none_timeout(self):
        """A timeout of None means "cache forever"."""
        output = self.engine.render_to_string('first')
        self.assertEqual(output, 'content')
        output = self.engine.render_to_string('second')
        self.assertEqual(output, 'content')


class CacheTests(SimpleTestCase):

    @classmethod
    def setUpClass(cls):
        cls.engine = Engine(libraries={'cache': 'django.templatetags.cache'})
        super().setUpClass()

    def test_cache_regression_20130(self):
        t = self.engine.from_string('{% load cache %}{% cache 1 regression_20130 %}foo{% endcache %}')
        cachenode = t.nodelist[1]
        self.assertEqual(cachenode.fragment_name, 'regression_20130')

    @override_settings(CACHES={
        'default': {
            'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
            'LOCATION': 'default',
        },
        'template_fragments': {
            'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
            'LOCATION': 'fragments',
        },
    })
    def test_cache_fragment_cache(self):
        """
        When a cache called "template_fragments" is present, the cache tag
        will use it in preference to 'default'
        """
        t1 = self.engine.from_string('{% load cache %}{% cache 1 fragment %}foo{% endcache %}')
        t2 = self.engine.from_string('{% load cache %}{% cache 1 fragment using="default" %}bar{% endcache %}')

        ctx = Context()
        o1 = t1.render(ctx)
        o2 = t2.render(ctx)

        self.assertEqual(o1, 'foo')
        self.assertEqual(o2, 'bar')

    def test_cache_missing_backend(self):
        """
        When a cache that doesn't exist is specified, the cache tag will
        raise a TemplateSyntaxError
        '"""
        t = self.engine.from_string('{% load cache %}{% cache 1 backend using="unknown" %}bar{% endcache %}')

        ctx = Context()
        with self.assertRaises(TemplateSyntaxError):
            t.render(ctx)