from uuid import uuid4
from urllib.parse import urlsplit

from facepy import GraphAPI
from facepy.exceptions import FacepyError

from django.contrib.auth import get_user_model, logout, login, views
from django.contrib.auth.forms import AuthenticationForm
from django.core.files.base import ContentFile
from django.http import JsonResponse
from django.urls import reverse_lazy
from django.utils.decorators import method_decorator
from django.views.decorators.csrf import csrf_exempt
from django.views.generic import FormView, View, TemplateView
from django.views.generic.edit import BaseFormView
from django.shortcuts import redirect

from apps.notification.utils import send_email
from apps.config.models import Config

from .forms import LearnerRegistrationForm
from .tokens import verification_email_token

User = get_user_model()


class LearnerRegistrationView(FormView):
    form_class = LearnerRegistrationForm
    template_name = "auth/registration-learner.html"

    def form_valid(self, form):
        first_name = form.cleaned_data['first_name']
        last_name = form.cleaned_data['last_name']
        email = form.cleaned_data['email']
        password = form.cleaned_data['password']

        user, created = User.objects.get_or_create(
            username=email, email=email,
            first_name=first_name, last_name=last_name
        )

        if not created:
            return JsonResponse({
                "success": False,
                'errors': {'__all__': [{'message': 'Возможно вы уже зарегистрированы?'}]}
            }, status=400)

        user.set_password(password)
        user.save()
        login(self.request, user)

        # fixme: change email text
        # fixme: async send email
        config = Config.load()
        refferer = urlsplit(self.request.META.get('HTTP_REFERER'))
        refferer = str(refferer[0]) + '://' + str(refferer[1])
        token = verification_email_token.make_token(user)
        url = refferer + str(reverse_lazy('lilcity:verification-email', args=[token]))
        send_email('Verification Email', email, "notification/email/verification_email.html", url=url, config=config)

        return JsonResponse({"success": True}, status=201)

    def form_invalid(self, form):
        return JsonResponse(form.errors.get_json_data(escape_html=True), status=400)


class LogoutView(View):
    def get(self, request, *args, **kwargs):
        logout(request)
        return redirect('/')


class LoginView(FormView):
    form_class = AuthenticationForm
    template_name = "auth/login.html"

    def form_valid(self, form):
        login(self.request, form.get_user())
        return JsonResponse({"success": True})

    def form_invalid(self, form):
        return JsonResponse({"success": False, "errors": form.errors.get_json_data(escape_html=True)}, status=400)


class VerificationEmailView(View):
    def get(self, request, *args, **kwargs):
        is_valid_token = verification_email_token.check_token(
            request.user, kwargs.get('token'))

        if is_valid_token:
            request.user.is_email_proved = True
            request.user.save()
            login(request, request.user)
            return redirect(reverse_lazy('lilcity:success-verification-email'))
        else:
            return JsonResponse({"success": False}, status=400)


class SuccessVerificationEmailView(TemplateView):
    template_name = 'auth/success-verification.html'


class PasswordResetView(views.PasswordContextMixin, BaseFormView):
    email_template_name = 'auth/password_reset.txt'
    subject_template_name = "auth/password_reset_subject.txt"
    form_class = views.PasswordResetForm

    extra_email_context = None
    from_email = None
    html_email_template_name = "auth/password_reset.html"
    title = 'Password reset'
    token_generator = views.default_token_generator

    def form_valid(self, form):
        refferer = urlsplit(self.request.META.get('HTTP_REFERER'))
        refferer = str(refferer[0]) + '://' + str(refferer[1])
        config = Config.load()
        extra_email_context = {'config': config}
        if self.extra_email_context and isinstance(self.extra_email_context, dict):
            extra_email_context.update(self.extra_email_context)
        opts = {
            'domain_override': refferer,
            'use_https': self.request.is_secure(),
            'token_generator': self.token_generator,
            'from_email': self.from_email,
            'email_template_name': self.email_template_name,
            'subject_template_name': self.subject_template_name,
            'request': self.request,
            'html_email_template_name': self.html_email_template_name,
            'extra_email_context': extra_email_context,
        }
        form.save(**opts)
        return JsonResponse({"success": True})


class PasswordResetConfirmView(views.PasswordResetConfirmView):
    template_name = "auth/password_reset_confirm.html"
    success_url = reverse_lazy('lilcity:password_reset_complete')


class PasswordResetComplete(views.PasswordResetCompleteView):
    template_name = 'auth/password_reset_complete.html'


@method_decorator(csrf_exempt, name="dispatch")
class FacebookLoginOrRegistration(View):
    def post(self, requests, *args, **kwargs):
        access_token = requests.POST.get('access_token')
        graph = GraphAPI(access_token)
        try:
            data = graph.get('/me?fields=email, first_name, last_name')
            photo_data = graph.get('/me/picture?height=120')
        except FacepyError:
            return JsonResponse({"success": False})

        fb_id = data.get('id')

        try:
            user = User.objects.get(fb_id=fb_id)
        except User.DoesNotExist:
            email = requests.POST.get('email') or data.get('email')
            if not email:
                return JsonResponse({"success": False,
                                     "errors": {"email": 'is field required'}
                                     })
            else:
                try:
                    user = User.objects.get(email=email)
                except User.DoesNotExist:
                    first_name = data.get('first_name', '')
                    last_name = data.get('last_name', '')

                    user = User.objects.create_user(username=email, email=email, first_name=first_name, last_name=last_name, password=uuid4().hex)
                    user.is_email_proved = True
                    user.fb_id = fb_id
                    if photo_data:
                        photo = ContentFile(photo_data)
                        fname = str(fb_id) + '.jpg'
                        user.photo.save(fname, photo, save=True)
                    user.save()

                login(requests, user=user)
                return JsonResponse({"success": True})
        else:
            if not user.photo and photo_data:
                photo = ContentFile(photo_data)
                fname = str(fb_id) + '.jpg'
                user.photo.save(fname, photo, save=True)
            login(requests, user=user)
            return JsonResponse({"success": True})