import pytest

from urllib.parse import urljoin, urlparse
import shutil
import tempfile

import django
from django.test.utils import override_settings
from django.conf import settings
from django.contrib.staticfiles import storage, finders
from django.core.wsgi import get_wsgi_application
from django.core.management import call_command
from django.utils.functional import empty

from whitenoise.middleware import WhiteNoiseMiddleware, WhiteNoiseFileResponse

from .utils import AppServer, Files


@pytest.fixture(autouse=True, scope="module")
def setup():
    yield django.setup()


def reset_lazy_object(obj):
    obj._wrapped = empty


def get_url_path(base, url):
    return urlparse(urljoin(base, url)).path


@override_settings()
@pytest.fixture(scope="module")
def static_files():
    files = Files("static", js="app.js", nonascii="nonascii\u2713.txt")
    settings.STATICFILES_DIRS = [files.directory]
    return files


@override_settings()
@pytest.fixture(scope="module")
def root_files():
    files = Files("root", robots="robots.txt")
    settings.WHITENOISE_ROOT = files.directory
    return files


@override_settings()
@pytest.fixture(scope="module")
def tmp():
    tmp_dir = tempfile.mkdtemp()
    settings.STATIC_ROOT = tmp_dir
    yield tmp_dir
    shutil.rmtree(tmp_dir)


@pytest.fixture(scope="module")
def _collect_static(static_files, root_files, tmp):
    reset_lazy_object(storage.staticfiles_storage)
    call_command("collectstatic", verbosity=0, interactive=False)


@pytest.fixture(scope="module")
def application(_collect_static):
    return get_wsgi_application()


@pytest.fixture(scope="module")
def server(application):
    app_server = AppServer(application)
    yield app_server
    app_server.close()


def test_get_root_file(server, root_files, _collect_static):
    response = server.get(root_files.robots_url)
    assert response.content == root_files.robots_content


def test_versioned_file_cached_forever(server, static_files, _collect_static):
    url = storage.staticfiles_storage.url(static_files.js_path)
    response = server.get(url)
    assert response.content == static_files.js_content
    assert response.headers.get(
        "Cache-Control"
    ) == "max-age={}, public, immutable".format(WhiteNoiseMiddleware.FOREVER)


def test_unversioned_file_not_cached_forever(server, static_files, _collect_static):
    url = settings.STATIC_URL + static_files.js_path
    response = server.get(url)
    assert response.content == static_files.js_content
    assert response.headers.get("Cache-Control") == "max-age={}, public".format(
        WhiteNoiseMiddleware.max_age
    )


def test_get_gzip(server, static_files, _collect_static):
    url = storage.staticfiles_storage.url(static_files.js_path)
    response = server.get(url)
    assert response.content == static_files.js_content
    assert response.headers["Content-Encoding"] == "gzip"
    assert response.headers["Vary"] == "Accept-Encoding"


def test_get_brotli(server, static_files, _collect_static):
    url = storage.staticfiles_storage.url(static_files.js_path)
    response = server.get(url, headers={"Accept-Encoding": "gzip, br"})
    assert response.content == static_files.js_content
    assert response.headers["Content-Encoding"] == "br"
    assert response.headers["Vary"] == "Accept-Encoding"


def test_no_content_type_when_not_modified(server, static_files, _collect_static):
    last_mod = "Fri, 11 Apr 2100 11:47:06 GMT"
    url = settings.STATIC_URL + static_files.js_path
    response = server.get(url, headers={"If-Modified-Since": last_mod})
    assert "Content-Type" not in response.headers


def test_get_nonascii_file(server, static_files, _collect_static):
    url = settings.STATIC_URL + static_files.nonascii_path
    response = server.get(url)
    assert response.content == static_files.nonascii_content


@override_settings()
@pytest.fixture(params=[True, False], scope="module")
def finder_static_files(request):
    files = Files("static", js="app.js", index="with-index/index.html")
    settings.STATICFILES_DIRS = [files.directory]
    settings.WHITENOISE_USE_FINDERS = True
    settings.WHITENOISE_AUTOREFRESH = request.param
    settings.WHITENOISE_INDEX_FILE = True
    settings.STATIC_ROOT = None
    try:
        finders.get_finder.cache_clear()
    except AttributeError:
        finders._finders.clear()
    return files


def test_no_content_disposition_header(server, static_files, _collect_static):
    url = settings.STATIC_URL + static_files.js_path
    response = server.get(url)
    assert response.headers.get("content-disposition") is None


@pytest.fixture(scope="module")
def finder_application(finder_static_files):
    return get_wsgi_application()


@pytest.fixture(scope="module")
def finder_server(finder_application):
    app_server = AppServer(finder_application)
    yield app_server
    app_server.close()


def test_file_served_from_static_dir(finder_static_files, finder_server):
    url = settings.STATIC_URL + finder_static_files.js_path
    response = finder_server.get(url)
    assert response.content == finder_static_files.js_content


def test_non_ascii_requests_safely_ignored(finder_server):
    response = finder_server.get(settings.STATIC_URL + "test\u263A")
    assert 404 == response.status_code


def test_requests_for_directory_safely_ignored(finder_server):
    url = settings.STATIC_URL + "directory"
    response = finder_server.get(url)
    assert 404 == response.status_code


def test_index_file_served_at_directory_path(finder_static_files, finder_server):
    path = finder_static_files.index_path.rpartition("/")[0] + "/"
    response = finder_server.get(settings.STATIC_URL + path)
    assert response.content == finder_static_files.index_content


def test_index_file_path_redirected(finder_static_files, finder_server):
    directory_path = finder_static_files.index_path.rpartition("/")[0] + "/"
    index_url = settings.STATIC_URL + finder_static_files.index_path
    response = finder_server.get(index_url, allow_redirects=False)
    location = get_url_path(response.url, response.headers["Location"])
    assert response.status_code == 302
    assert location == settings.STATIC_URL + directory_path


def test_directory_path_without_trailing_slash_redirected(
    finder_static_files, finder_server
):
    directory_path = finder_static_files.index_path.rpartition("/")[0] + "/"
    directory_url = settings.STATIC_URL + directory_path.rstrip("/")
    response = finder_server.get(directory_url, allow_redirects=False)
    location = get_url_path(response.url, response.headers["Location"])
    assert response.status_code == 302
    assert location == settings.STATIC_URL + directory_path


def test_whitenoise_file_response_has_only_one_header():
    response = WhiteNoiseFileResponse(open(__file__, "rb"))
    response.close()
    headers = {key.lower() for key, value in response.items()}
    # This subclass should have none of the default headers that FileReponse
    # sets
    assert headers == {"content-type"}


@pytest.mark.skipif(django.VERSION[:2] < (3, 1), reason="feature added in Django 3.1")
@override_settings()
def test_relative_static_url(server, static_files, _collect_static):
    settings.STATIC_URL = "static/"
    url = storage.staticfiles_storage.url(static_files.js_path)
    response = server.get(url)
    assert response.content == static_files.js_content