import mimetypes
import unittest
from os import path
from urllib.parse import quote

from django.conf.urls.static import static
from django.core.exceptions import ImproperlyConfigured
from django.http import FileResponse, HttpResponseNotModified
from django.test import SimpleTestCase, override_settings
from django.utils.http import http_date
from django.views.static import was_modified_since

from .. import urls
from ..urls import media_dir


@override_settings(DEBUG=True, ROOT_URLCONF="view_tests.urls")
class StaticTests(SimpleTestCase):
    """Tests django views in django/views/static.py"""

    prefix = "site_media"

    def test_serve(self):
        "The static view can serve static media"
        media_files = ["file.txt", "file.txt.gz", "%2F.txt"]
        for filename in media_files:
            response = self.client.get("/%s/%s" % (self.prefix, quote(filename)))
            response_content = b"".join(response)
            file_path = path.join(media_dir, filename)
            with open(file_path, "rb") as fp:
                self.assertEqual(fp.read(), response_content)
            self.assertEqual(
                len(response_content), int(response.headers["Content-Length"])
            )
            self.assertEqual(
                mimetypes.guess_type(file_path)[1],
                response.get("Content-Encoding", None),
            )

    def test_chunked(self):
        "The static view should stream files in chunks to avoid large memory usage"
        response = self.client.get("/%s/%s" % (self.prefix, "long-line.txt"))
        response_iterator = iter(response)
        first_chunk = next(response_iterator)
        self.assertEqual(len(first_chunk), FileResponse.block_size)
        second_chunk = next(response_iterator)
        response.close()
        # strip() to prevent OS line endings from causing differences
        self.assertEqual(len(second_chunk.strip()), 1449)

    def test_unknown_mime_type(self):
        response = self.client.get("/%s/file.unknown" % self.prefix)
        self.assertEqual("application/octet-stream", response.headers["Content-Type"])
        response.close()

    def test_copes_with_empty_path_component(self):
        file_name = "file.txt"
        response = self.client.get("/%s//%s" % (self.prefix, file_name))
        response_content = b"".join(response)
        with open(path.join(media_dir, file_name), "rb") as fp:
            self.assertEqual(fp.read(), response_content)

    def test_is_modified_since(self):
        file_name = "file.txt"
        response = self.client.get(
            "/%s/%s" % (self.prefix, file_name),
            headers={"if-modified-since": "Thu, 1 Jan 1970 00:00:00 GMT"},
        )
        response_content = b"".join(response)
        with open(path.join(media_dir, file_name), "rb") as fp:
            self.assertEqual(fp.read(), response_content)

    def test_not_modified_since(self):
        file_name = "file.txt"
        response = self.client.get(
            "/%s/%s" % (self.prefix, file_name),
            headers={
                # This is 24h before max Unix time. Remember to fix Django and
                # update this test well before 2038 :)
                "if-modified-since": "Mon, 18 Jan 2038 05:14:07 GMT"
            },
        )
        self.assertIsInstance(response, HttpResponseNotModified)

    def test_invalid_if_modified_since(self):
        """Handle bogus If-Modified-Since values gracefully

        Assume that a file is modified since an invalid timestamp as per RFC
        9110 Section 13.1.3.
        """
        file_name = "file.txt"
        invalid_date = "Mon, 28 May 999999999999 28:25:26 GMT"
        response = self.client.get(
            "/%s/%s" % (self.prefix, file_name),
            headers={"if-modified-since": invalid_date},
        )
        response_content = b"".join(response)
        with open(path.join(media_dir, file_name), "rb") as fp:
            self.assertEqual(fp.read(), response_content)
        self.assertEqual(len(response_content), int(response.headers["Content-Length"]))

    def test_invalid_if_modified_since2(self):
        """Handle even more bogus If-Modified-Since values gracefully

        Assume that a file is modified since an invalid timestamp as per RFC
        9110 Section 13.1.3.
        """
        file_name = "file.txt"
        invalid_date = ": 1291108438, Wed, 20 Oct 2010 14:05:00 GMT"
        response = self.client.get(
            "/%s/%s" % (self.prefix, file_name),
            headers={"if-modified-since": invalid_date},
        )
        response_content = b"".join(response)
        with open(path.join(media_dir, file_name), "rb") as fp:
            self.assertEqual(fp.read(), response_content)
        self.assertEqual(len(response_content), int(response.headers["Content-Length"]))

    def test_404(self):
        response = self.client.get("/%s/nonexistent_resource" % self.prefix)
        self.assertEqual(404, response.status_code)

    def test_index(self):
        response = self.client.get("/%s/" % self.prefix)
        self.assertContains(response, "Index of ./")
        # Directories have a trailing slash.
        self.assertIn("subdir/", response.context["file_list"])

    def test_index_subdir(self):
        response = self.client.get("/%s/subdir/" % self.prefix)
        self.assertContains(response, "Index of subdir/")
        # File with a leading dot (e.g. .hidden) aren't displayed.
        self.assertEqual(response.context["file_list"], ["visible"])

    @override_settings(
        TEMPLATES=[
            {
                "BACKEND": "django.template.backends.django.DjangoTemplates",
                "OPTIONS": {
                    "loaders": [
                        (
                            "django.template.loaders.locmem.Loader",
                            {
                                "static/directory_index.html": "Test index",
                            },
                        ),
                    ],
                },
            }
        ]
    )
    def test_index_custom_template(self):
        response = self.client.get("/%s/" % self.prefix)
        self.assertEqual(response.content, b"Test index")


class StaticHelperTest(StaticTests):
    """
    Test case to make sure the static URL pattern helper works as expected
    """

    def setUp(self):
        super().setUp()
        self._old_views_urlpatterns = urls.urlpatterns[:]
        urls.urlpatterns += static("media/", document_root=media_dir)

    def tearDown(self):
        super().tearDown()
        urls.urlpatterns = self._old_views_urlpatterns

    def test_prefix(self):
        self.assertEqual(static("test")[0].pattern.regex.pattern, "^test(?P<path>.*)$")

    @override_settings(DEBUG=False)
    def test_debug_off(self):
        """No URLs are served if DEBUG=False."""
        self.assertEqual(static("test"), [])

    def test_empty_prefix(self):
        with self.assertRaisesMessage(
            ImproperlyConfigured, "Empty static prefix not permitted"
        ):
            static("")

    def test_special_prefix(self):
        """No URLs are served if prefix contains a netloc part."""
        self.assertEqual(static("http://example.org"), [])
        self.assertEqual(static("//example.org"), [])


class StaticUtilsTests(unittest.TestCase):
    def test_was_modified_since_fp(self):
        """
        A floating point mtime does not disturb was_modified_since (#18675).
        """
        mtime = 1343416141.107817
        header = http_date(mtime)
        self.assertFalse(was_modified_since(header, mtime))

    def test_was_modified_since_empty_string(self):
        self.assertTrue(was_modified_since(header="", mtime=1))
