import os
from PIL import Image
from django.shortcuts import redirect, render
from django.template import loader

from django.core import mail
from django.http import HttpResponse, FileResponse
from django.urls import reverse_lazy
from django.views.generic import UpdateView
from django.views.decorators.cache import cache_control
from django.utils.translation import gettext

from django.contrib import auth
from django.contrib.auth.decorators import permission_required
from django.contrib.auth.mixins import PermissionRequiredMixin

from .models import *
from .forms import *
from website.settings import BASE_DIR

def index(request, group_id=None):
  if request.user.has_perm('stammbaum.view'):
    if group_id == None:
      persons = Person.objects
    else:
      persons = Person.objects.filter(group_id=group_id)

    partners = Person.partners.through.objects

    context = {
      'persons': list(persons.values_list()),
      'pairs': list(partners.values_list()),
      'groups': list(Group.objects.values())
    }
    return render(request, 'stammbaum/index.html', context, status=200)
  else:
    return render(request, 'stammbaum/index.html', status=403)

class Login(auth.views.LoginView):
  template_name = 'stammbaum/login.html'

def register(request):
  if request.method == 'POST':
    form = SignUpForm(request.POST)
    if form.is_valid():
      user: User = form.save()
      user.refresh_from_db()
      # load the profile instance created by the signal
      user.save()
      raw_password = form.cleaned_data.get('password1')

      # login user after signing up
      user = auth.authenticate(username=user.username, password=raw_password)
      auth.login(request, user)

      # notify admin
      with mail.get_connection() as connection:
        mail.mail_admins(
          f"{user.get_full_name()} has registered to 'Stammbaum'", 
          f"{user.username} ({user.get_full_name()}) <{user.email}> has registered to 'Stammbaum'.\n" +
          f"Please update their permissions accordingly.\n" + 
          f"https://pi.justprojects.de/admin/auth/user/{user.id}/change/",
          False,
          connection
        )

      # redirect user to home page
      return redirect('/stammbaum/')
  else:
      form = SignUpForm()
  return render(request, 'stammbaum/register.html', context={"form": SignUpForm})

def logout(request):
  auth.logout(request)
  template = loader.get_template('stammbaum/index.html')
  return HttpResponse(template.render(None, request))

@permission_required("stammbaum.view")
@cache_control(max_age=3600)
def image_preview(request, person_id):
  person = Person.objects.filter(id=person_id).first()
  if person and person.image:
    img = Image.open(os.path.join(BASE_DIR, '../data', str(person.image)))
  else:
    img = Image.open(os.path.join(BASE_DIR, '../data', "default.jpeg"))

  img.thumbnail((256, 256))
  res = HttpResponse(content_type="image/jpeg")
  img.save(res, format='JPEG')
  return res

@permission_required("stammbaum.view")
@cache_control(max_age=3600)
def image(request, person_id):
  person = Person.objects.filter(id=person_id).first()
  if person and person.image:
    img = open(os.path.join(BASE_DIR, '../data', str(person.image)), 'rb')
  else:
    img = open(os.path.join(BASE_DIR, '../data', "default.jpeg"), 'rb')
  return FileResponse(img)

class UploadImageView(PermissionRequiredMixin, UpdateView):
  model = Person
  form_class = UploadImage
  permission_required = ("stammbaum.view", "stammbaum.upload_image")
  template_name = "stammbaum/upload.html"
  success_url = "/stammbaum/"

  def get_context_data(self, **kwargs):
    kwargs['image_upload_text'] = gettext("Upload image for {}").format(self.object.name)
    return super().get_context_data(**kwargs)