from django.utils.http import urlsafe_base64_encode, urlsafe_base64_decode
from django.shortcuts import render, get_object_or_404
from django.contrib.auth.tokens import default_token_generator
from django.contrib.sites.shortcuts import get_current_site
from django.template.loader import render_to_string
from django.core.mail import EmailMultiAlternatives
from django.utils.encoding import force_bytes
from django.http import HttpResponse, Http404
from django.conf import settings
from .forms import RegistrationForm
from .models import NelUser


def profile(request):
    return HttpResponse('<h1>lol</h1>')


def send_activation_email(request, user):
    current_site = get_current_site(request)
    context = {
        'email': user.email,
        'domain': current_site.domain,
        'site_name': current_site.name,
        'uid': urlsafe_base64_encode(force_bytes(user.pk)).decode(),
        'user': user,
        'token': default_token_generator.make_token(user),
        'protocol': 'https' if request.is_secure() else 'http',
    }
    subject = render_to_string('neluser/activate_email_subject.txt', context)
    subject = ''.join(subject.splitlines())
    email_message = EmailMultiAlternatives(
        subject,
        render_to_string('neluser/activate_email.txt', context),
        settings.DEFAULT_FROM_EMAIL,
        [user.email]
    )
    email_message.attach_alternative(
        render_to_string('neluser/activate_email.html', context),
        'text/html'
    )
    email_message.send()


def activate(request, uidb64, token):
    uid = urlsafe_base64_decode(uidb64).decode()
    user = get_object_or_404(NelUser, pk=uid)
    if default_token_generator.check_token(user, token):
        user.is_active = True
        user.save()
        return render(
            request,
            'neluser/activate_done.html'
        )
    raise Http404("Unable to activate user %d with token %s." % (uid, token))


def register(request):
    if request.method == 'GET':
        form = RegistrationForm()
    elif request.method == 'POST':
        form = RegistrationForm(data=request.POST)
        if form.is_valid():
            user = form.save(commit=False)
            user.set_password(form.cleaned_data.get('password1'))
            user.is_active = not settings.REGISTER_REQUIRE_VALIDATION
            user.save()
            if settings.REGISTER_REQUIRE_VALIDATION:
                send_activation_email(request, user)
            return render(request, 'neluser/register_done.html')
    return render(request, 'neluser/register.html', {'form': form})