import os
import logging
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.shortcuts import redirect
from django.conf import settings

from apps.notification.utils import send_email
from apps.config.models import Config
from apps.user.models import Referral
from .forms import LearnerRegistrationForm
from .tokens import verification_email_token


User = get_user_model()
logger = logging.getLogger(__name__)


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

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

        user, created = User.objects.get_or_create(
            email=email,
        )

        if not created:
            if self.request.is_ajax():
                return JsonResponse({
                    "success": False,
                    'errors': {'__all__': [{'message': 'Возможно вы уже зарегистрированы?'}]}
                }, status=400)
            else:
                context = self.get_context_data(form=form)
                context['error'] = 'Возможно вы уже зарегистрированы?'
                return self.render_to_response(context)

        user.username = email
        user.first_name = first_name
        user.last_name = last_name

        user.set_password(password)
        user.save()
        referrer = self.request.session.get('referrer')
        if referrer:
            Referral.objects.create(referral=user, referrer_id=referrer, bonus=config.REFERRAL_BONUS,
                                    referrer_bonus=config.REFERRER_BONUS)
            # TODO: email admins? мб реферера уже нет, старая ссылка
            self.request.session['referrer'] = None
        login(self.request, user)

        # fixme: change email text
        # fixme: async send email
        http_referer = urlsplit(self.request.META.get('HTTP_REFERER'))
        http_referer = str(http_referer[0]) + '://' + str(http_referer[1])
        token = verification_email_token.make_token(user)
        url = http_referer + str(reverse_lazy('lilcity:verification-email', args=[token, user.id]))
        try:
            send_email('Вы успешно прошли регистрацию', email, "notification/email/verification_email.html", url=url, config=config)
        except Exception as e:
            logger.error(str(e))

        if self.request.is_ajax():
            return JsonResponse({"success": True}, status=201)
        else:
            return super().form_valid(form)

    def form_invalid(self, form):
        if self.request.is_ajax():
            return JsonResponse(form.errors.get_json_data(escape_html=True), status=400)
        else:
            return super().form_invalid(form)


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


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

    def form_valid(self, form):
        login(self.request, form.get_user())
        self.request.session['referrer'] = None
        if self.request.is_ajax():
            return JsonResponse({"success": True})
        else:
            return super().form_valid(form)

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


class VerificationEmailView(View):
    def get(self, request, *args, **kwargs):
        user = User.objects.get(pk=kwargs.get('uid'))
        is_valid_token = verification_email_token.check_token(
            user, kwargs.get('token'))
        next = request.GET.get('next')

        if is_valid_token:
            user.is_email_proved = True
            user.save()
            login(request, user)
            self.request.session['referrer'] = None
            return redirect(next or 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, FormView):
    email_template_name = 'auth/password_reset_email.txt'
    subject_template_name = "auth/password_reset_subject.txt"
    form_class = views.PasswordResetForm
    template_name = "auth/password_reset.html"
    success_url = '/'

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

    def form_valid(self, form):
        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': 'https://' + settings.MAIN_HOST,
            '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)
        if self.request.is_ajax():
            return JsonResponse({"success": True})
        else:
            return super().form_valid(form)


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:
                email = email.lower()
                try:
                    user = User.objects.get(email__iexact=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()

                referrer = self.request.session.get('referrer')
                if referrer:
                    config = Config.load()
                    Referral.objects.create(referral=user, referrer_id=referrer, bonus=config.REFERRAL_BONUS,
                                    referrer_bonus=config.REFERRER_BONUS)
                    # TODO: email admins? мб реферера уже нет, старая ссылка
                    self.request.session['referrer'] = None

                login(requests, user=user)
                return JsonResponse({"success": True})
        else:
            if (not user.photo or (user.photo and not os.path.isfile(user.photo.path))) and photo_data:
                photo = ContentFile(photo_data)
                fname = str(fb_id) + '.jpg'
                user.photo.save(fname, photo, save=True)
            login(requests, user=user)
            self.request.session['referrer'] = None
            return JsonResponse({"success": True})