from io import BytesIO
from PIL import Image
from os.path import splitext
from django.contrib.auth import login
from django.shortcuts import render, reverse, redirect
from django.views.generic import DetailView, UpdateView, TemplateView
from django.contrib import messages
from django.contrib.auth import get_user_model
from django.contrib.auth.decorators import login_required, permission_required
from django.contrib.auth.hashers import check_password, make_password
from django.http import Http404
from django.urls import reverse_lazy
from django.utils.decorators import method_decorator

from apps.auth.tokens import verification_email_token
from apps.course.models import Course
from apps.notification.utils import send_email

from .forms import UserEditForm

User = get_user_model()


@login_required
def resend_email_verify(request):
    token = verification_email_token.make_token(request.user)
    url = request.scheme + '://' + request.get_host() + str(reverse_lazy('lilcity:verification-email', args=[token]))
    send_email('Verification Email', request.user.email, "notification/email/verification_email.html", url=url)
    messages.info(request, 'Письмо подтверждения отправлено.')
    return redirect('user-edit-profile', request.user.id)


class UserView(DetailView):
    model = User
    template_name = 'user/profile.html'

    def get_context_data(self, object):
        context = super().get_context_data()
        context['published'] = Course.objects.filter(
            author=self.object,
        )
        context['pending'] = Course.objects.filter(
            author=self.object, status=Course.PENDING
        )
        context['drafts'] = Course.objects.filter(
            author=self.object, status=Course.DRAFT
        )
        context['paid'] = Course.objects.none()
        return context


class NotificationEditView(TemplateView):
    template_name = 'user/notification-settings.html'

    def get(self, request, pk=None):
        return super().get(request)


class PaymentHistoryView(TemplateView):
    template_name = 'user/payment-history.html'

    def get(self, request, pk=None):
        return super().get(request)


class UserEditView(UpdateView):
    model = User
    template_name = 'user/profile-settings.html'
    form_class = UserEditForm

    @method_decorator(login_required)
    def dispatch(self, request, *args, **kwargs):
        self.object = self.get_object()
        if request.user != self.object:
            raise Http404()
        return super().dispatch(request, *args, **kwargs)

    def post(self, request, *args, **kwargs):
        # it's magic *-*-*-*-*
        if 'photo' in request.FILES:
            photo_fp = request.FILES.pop('photo')[0]
            fname = photo_fp.name
            photo = Image.open(photo_fp)
            lowest_side = min(photo.size)
            horizontal_padding = (lowest_side - photo.size[0]) / 2
            vertical_padding = (lowest_side - photo.size[1]) / 2
            photo = photo.crop(
                (
                    -horizontal_padding,
                    -vertical_padding,
                    photo.size[0] + horizontal_padding,
                    photo.size[1] + vertical_padding
                )
            )
            if photo.size[0] > 512:
                photo = photo.resize((512, 512,))
            buffer = BytesIO()
            ext = splitext(fname)[1][1:].upper()
            if ext == 'JPG':
                ext = 'JPEG'
            photo.save(buffer, ext)
            self.object.photo.save(fname, buffer)
            buffer.close()
        if not request.POST._mutable:
            request.POST._mutable = True
        old_password = request.POST.pop('old_password')[0]
        new_password1 = request.POST.pop('new_password1')[0]
        new_password2 = request.POST.pop('new_password2')[0]
        if old_password:
            if request.user.check_password(old_password) and new_password1 == new_password2:
                request.user.set_password(new_password1)
                request.user.save()
                login(request, request.user)
            else:
                messages.error(request, 'Неверный пароль.')
        messages.info(request, 'Данные сохранены.')
        return super().post(request, *args, **kwargs)

    def get_success_url(self):
        return reverse('user-edit-profile', args=[self.object.id])