from urllib.parse import quote

from django.conf import settings
from django.contrib.auth.views import redirect_to_login
from django.http import Http404
from django.urls import resolve

from cms.page_rendering import _handle_no_page
from cms.utils import get_current_site
from cms.utils.page_permissions import user_can_view_page


def cms_perms(func):
    def inner(request, *args, **kwargs):
        page = request.current_page
        if page:
            if page.login_required and not request.user.is_authenticated:
                return redirect_to_login(quote(request.get_full_path()), settings.LOGIN_URL)
            site = get_current_site(request)
            if not user_can_view_page(request.user, page, site):
                return _handle_no_page(request)
        return func(request, *args, **kwargs)
    inner.__module__ = func.__module__
    inner.__doc__ = func.__doc__
    if hasattr(func, "view_class"):
        inner.view_class = func.view_class
    if hasattr(func, '__name__'):
        inner.__name__ = func.__name__
    elif hasattr(func, '__class__'):
        inner.__name__ = func.__class__.__name__

    # for django.contrib.admindoc
    if hasattr(func, '__qualname__'):
        inner.__qualname__ = func.__qualname__
    elif hasattr(func, '__class__') and hasattr(func.__class__, '__qualname__'):
        inner.__qualname__ = func.__class__.__qualname__

    if getattr(func, 'csrf_exempt', False):
        # view has set csrf_exempt flag
        # so pass it down to the decorator.
        inner.csrf_exempt = True
    return inner


def cms_site_filter(site_id):
    def _cms_site_filter(func):
        def inner(request, *args, **kwargs):
            site = get_current_site(request)
            if site.id != site_id:
                match = resolve(request.path)
                raise Http404(dict(path=request.path, tried=match.tried))
            return func(request, *args, **kwargs)

        inner.__module__ = func.__module__
        inner.__doc__ = func.__doc__
        if hasattr(func, "view_class"):
            inner.view_class = func.view_class
        if hasattr(func, '__name__'):
            inner.__name__ = func.__name__
        elif hasattr(func, '__class__'):
            inner.__name__ = func.__class__.__name__

        # for django.contrib.admindoc
        if hasattr(func, '__qualname__'):
            inner.__qualname__ = func.__qualname__
        elif hasattr(func, '__class__') and hasattr(func.__class__, '__qualname__'):
            inner.__qualname__ = func.__class__.__qualname__

        if getattr(func, 'csrf_exempt', False):
            # view has set csrf_exempt flag
            # so pass it down to the decorator.
            inner.csrf_exempt = True
        return inner
    return _cms_site_filter