from django.http import HttpResponseRedirect, QueryDict
from django.urls.exceptions import Resolver404
from django.shortcuts import render
from neluser.models import NelUser
from django.urls import reverse, resolve
from django.conf import settings


def is_link_legit(url):
    try:
        resolve(url)
    except Resolver404:
        return False
    return True


def is_nsfw_allowed(request):
    if isinstance(request.user, NelUser):
        if request.user.nsfw_allowed:
            return True
    s = request.COOKIES.get(settings.KHAGANAT_NSFW_NAME) or ''
    return s.lower() in settings.KHAGANAT_NSFW_OK


def disable_view(request, max_age):
    try:
        max_age = int(max_age) or None
    except ValueError:
        max_age = None
    next_url = QueryDict(request.META.get('QUERY_STRING')).get('next') or '/'
    if not is_link_legit(next_url):
        next_url = '/'
    response = HttpResponseRedirect(next_url)
    if isinstance(request.user, NelUser) and not max_age:
        request.user.nsfw_allowed = True
        request.user.save()
    else:
        response.set_cookie(
            settings.KHAGANAT_NSFW_NAME,
            'true',
            max_age=max_age
        )
    return response


def warn_view(request):
    next_url = QueryDict(request.META.get('QUERY_STRING')).get('next') or '/'
    if not is_link_legit(next_url):
        next_url = '/'
    context = {
        'next_url': next_url,
        'is_authenticated': request.user.is_authenticated,
    }
    return render(request, 'neluser/nsfw.html', context=context)


def redirect(request):
    dest = '{to_url}?next={next_url}'.format(
        to_url=reverse(warn_view),
        next_url=request.get_full_path()
    )
    return HttpResponseRedirect(dest)