"""passbook TOTP Views"""
# from base64 import b32encode
# from binascii import unhexlify

from django.contrib import messages
from django.contrib.auth.decorators import login_required
from django.http import Http404, HttpRequest, HttpResponse
from django.shortcuts import get_object_or_404, redirect, render
from django.urls import reverse
from django.utils.translation import ugettext as _
from django.views.decorators.cache import never_cache
from django_otp import login, match_token, user_has_device
from django_otp.decorators import otp_required
from django_otp.plugins.otp_static.models import StaticDevice, StaticToken
from django_otp.plugins.otp_totp.models import TOTPDevice
from qrcode import make as qr_make
from qrcode.image.svg import SvgPathImage

from passbook.lib.decorators import reauth_required
# from passbook.core.models import Event
# from passbook.core.views.wizards import BaseWizardView
from passbook.totp.forms import TOTPVerifyForm
from passbook.totp.utils import otpauth_url

TFA_SESSION_KEY = 'passbook_2fa_key'


@login_required
@reauth_required
def index(request: HttpRequest) -> HttpResponse:
    """Show empty index page"""
    return render(request, 'core/generic.html', {
        'text': 'Test TOTP passed'
    })


@login_required
def verify(request: HttpRequest) -> HttpResponse:
    """Verify TOTP Token"""
    if not user_has_device(request.user):
        messages.error(request, _("You don't have 2-Factor Authentication set up."))
    if request.method == 'POST':
        form = TOTPVerifyForm(request.POST)
        if form.is_valid():
            device = match_token(request.user, form.cleaned_data.get('code'))
            if device:
                login(request, device)
                messages.success(request, _('Successfully validated TOTP Token.'))
                # Check if there is a next GET parameter and redirect to that
                if 'next' in request.GET:
                    return redirect(request.GET.get('next'))
                # Otherwise just index
                return redirect(reverse('passbook_core:overview'))
            messages.error(request, _('Invalid 2-Factor Token.'))
    else:
        form = TOTPVerifyForm()

    return render(request, 'generic/form_login.html', {
        'form': form,
        'title': _("SSO - Two-factor verification"),
        'primary_action': _("Verify"),
        'extra_links': {
            'passbook_core:auth-logout': 'Logout',
        }
    })


@login_required
def user_settings(request: HttpRequest) -> HttpResponse:
    """View for user settings to control TOTP"""
    static = get_object_or_404(StaticDevice, user=request.user, confirmed=True)
    static_tokens = StaticToken.objects.filter(device=static).order_by('token')
    finished_totp_devices = TOTPDevice.objects.filter(user=request.user, confirmed=True)
    finished_static_devices = StaticDevice.objects.filter(user=request.user, confirmed=True)
    state = finished_totp_devices.exists() and finished_static_devices.exists()
    return render(request, 'totp/user_settings.html', {
        'static_tokens': static_tokens,
        'state': state,
    })


@login_required
@reauth_required
@otp_required
def disable(request: HttpRequest) -> HttpResponse:
    """Disable TOTP for user"""
    # Delete all the devices for user
    static = get_object_or_404(StaticDevice, user=request.user, confirmed=True)
    static_tokens = StaticToken.objects.filter(device=static).order_by('token')
    totp = TOTPDevice.objects.filter(user=request.user, confirmed=True)
    static.delete()
    totp.delete()
    for token in static_tokens:
        token.delete()
    messages.success(request, 'Successfully disabled TOTP')
    # Create event with email notification
    # Event.create(
    #     user=request.user,
    #     message=_('You disabled TOTP.'),
    #     current=True,
    #     request=request,
    #     send_notification=True)
    return redirect(reverse('passbook_core:overview'))


# # pylint: disable=too-many-ancestors
# @method_decorator([login_required, reauth_required], name="dispatch")
# class TFASetupView(BaseWizardView):
#     """Wizard to create a Mail Account"""

#     title = _('Set up TOTP')
#     form_list = [TFASetupInitForm, TFASetupStaticForm]

#     totp_device = None
#     static_device = None
#     confirmed = False

#     def get_template_names(self):
#         if self.steps.current == '1':
#             return 'totp/wizard_setup_static.html'
#         return self.template_name

#     def handle_request(self, request: HttpRequest):
#         # Check if user has TOTP setup already
#         finished_totp_devices = TOTPDevice.objects.filter(user=request.user, confirmed=True)
#         finished_static_devices = StaticDevice.objects.filter(user=request.user, confirmed=True)
#         if finished_totp_devices.exists() or finished_static_devices.exists():
#             messages.error(request, _('You already have TOTP enabled!'))
#             return redirect(reverse('passbook_core:overview'))
#         # Check if there's an unconfirmed device left to set up
#         totp_devices = TOTPDevice.objects.filter(user=request.user, confirmed=False)
#         if not totp_devices.exists():
#             # Create new TOTPDevice and save it, but not confirm it
#             self.totp_device = TOTPDevice(user=request.user, confirmed=False)
#             self.totp_device.save()
#         else:
#             self.totp_device = totp_devices.first()

#         # Check if we have a static device already
#         static_devices = StaticDevice.objects.filter(user=request.user, confirmed=False)
#         if not static_devices.exists():
#             # Create new static device and some codes
#             self.static_device = StaticDevice(user=request.user, confirmed=False)
#             self.static_device.save()
#             # Create 9 tokens and save them
#             # pylint: disable=unused-variable
#             for counter in range(0, 9):
#                 token = StaticToken(device=self.static_device, token=StaticToken.random_token())
#                 token.save()
#         else:
#             self.static_device = static_devices.first()

#         # Somehow convert the generated key to base32 for the QR code
#         rawkey = unhexlify(self.totp_device.key.encode('ascii'))
#         request.session[TFA_SESSION_KEY] = b32encode(rawkey).decode("utf-8")
#         return True

#     def get_form(self, step=None, data=None, files=None):
#         form = super(TFASetupView, self).get_form(step, data, files)
#         if step is None:
#             step = self.steps.current
#         if step == '0':
#             form.confirmed = self.confirmed
#             form.device = self.totp_device
#             form.fields['qr_code'].initial = reverse('passbook_tfa:tfa-qr')
#         elif step == '1':
#             # This is a bit of a hack, but the 2fa token from step 1 has been checked here
#             # And we need to save it, otherwise it's going to fail in render_done
#             # and we're going to be redirected to step0
#             self.confirmed = True

#             tokens = [(x.token, x.token) for x in self.static_device.token_set.all()]
#             form.fields['tokens'].choices = tokens
#         return form

#     def finish(self, *forms):
#         # Save device as confirmed
#         self.totp_device.confirmed = True
#         self.totp_device.save()
#         self.static_device.confirmed = True
#         self.static_device.save()
#         # Create event with email notification
#         Event.create(
#             user=self.request.user,
#             message=_('You activated TOTP.'),
#             current=True,
#             request=self.request,
#             send_notification=True)
#         return redirect(reverse('passbook_tfa:tfa-index'))


@never_cache
@login_required
def qr_code(request: HttpRequest) -> HttpResponse:
    """View returns an SVG image with the OTP token information"""
    # Get the data from the session
    try:
        key = request.session[TFA_SESSION_KEY]
    except KeyError:
        raise Http404

    url = otpauth_url(accountname=request.user.username, secret=key)
    # Make and return QR code
    img = qr_make(url, image_factory=SvgPathImage)
    resp = HttpResponse(content_type='image/svg+xml; charset=utf-8')
    img.save(resp)
    return resp