import qrcode
import base64
import io

from django.contrib.auth import get_user
from django.shortcuts import redirect, get_object_or_404
from django.urls import reverse
from django.views.generic import DetailView
from django.views.generic.base import TemplateView
from django.core.exceptions import PermissionDenied
from django.db import transaction

from . import logika
from .models import Stanoviste, Tym
from .utils.hash import get_hash_now, get_hash_previous, get_hash_preprevious
from .utils.doba import Doba


# Jen hloupé rozhazovátko
def hra_view(request):
	user = request.user
	if not user.is_authenticated:
		return redirect(reverse("login"))

	stanoviste = Stanoviste.objects.filter(user=user.id).first()
	if stanoviste is not None:
		return redirect(reverse("stanoviste"))

	tym = Tym.objects.filter(user=user.id).first()
	if tym is not None:
		return redirect(reverse("tym"))
	raise PermissionDenied


class StatickeStanovisteView(DetailView):
	template_name = "hra/staticke_stanoviste.html"
	model = Stanoviste

	def get_object(self, queryset=None):
		if "stanoviste" in self.kwargs:
			return get_object_or_404(Stanoviste, id=self.kwargs["stanoviste"])
		user = get_user(self.request)
		stanoviste = Stanoviste.objects.filter(user=user.id).first()
		if stanoviste is None:
			raise PermissionDenied
		return stanoviste

	def get_url(self):
		return self.request.build_absolute_uri(reverse(
			"tym",
			kwargs={
				"stanoviste": self.object.id,
				"my_hash": get_hash_now(self.object.id),
			}
		))

	@staticmethod
	def get_base64_qr_code(url: str):
		buffer = io.BytesIO()
		qrcode.make(url).save(buffer)
		# https://stackoverflow.com/a/75157188
		img_str = base64.b64encode(buffer.getvalue())
		return img_str.decode("utf-8")  # convert to str and cut b'' chars

	def get_context_data(self, **kwargs):
		context = super().get_context_data()
		url = self.get_url()
		context["url"] = url
		context["image64"] = self.get_base64_qr_code(url)
		return context


class TymView(DetailView):
	template_name = "hra/tym.html"
	model = Tym

	def get_object(self, queryset=None):
		user = get_user(self.request)
		tym = Tym.objects.filter(user=user.id).first()
		if tym is None:
			raise PermissionDenied
		return tym

	def get_context_data(self, **kwargs):
		context = super().get_context_data()
		context["doba"] = self.object.doba
		return context


class StanovisteZPohleduTymu(TemplateView):
	stanoviste_id: int
	stanoviste: Stanoviste
	tym: Tym
	doba: Doba

	def get_template_names(self):
		PREFIX = "hra/stanoviste/"
		return PREFIX + self.stanoviste.template

	def setup(self, request, *args, **kwargs):
		super().setup(request, *args, **kwargs)
		self.stanoviste_id = self.kwargs["stanoviste"]
		self.stanoviste = get_object_or_404(Stanoviste, id=self.stanoviste_id)
		self.tym = get_object_or_404(Tym, user=self.request.user.id)
		self.doba = self.tym.doba

	def dispatch(self, request, *args, **kwargs):
		if not self.pristupne():
			return redirect(reverse("timeout"))
		return super().dispatch(request, *args, **kwargs)

	def pristupne(self):
		my_hash = self.kwargs["my_hash"]
		return my_hash == get_hash_now(self.stanoviste_id) or my_hash == get_hash_previous(self.stanoviste_id) or my_hash == get_hash_preprevious(self.stanoviste_id)

	def get_posible_choices(self) -> list[str]:
		return logika.get_posible_choices[self.stanoviste.id](self.doba, self.tym)

	def get_context_data(self, **kwargs):
		context = super().get_context_data()
		context["stanoviste"] = self.stanoviste
		context["tym"] = self.tym
		context["doba"] = self.doba
		context["choices"] = self.get_posible_choices()
		return context

	def post(self, request, *args, **kwargs):
		context = self.get_context_data(**kwargs)
		self.template_name = "hra/staticke_stanoviste.html"
		choice = self.request.POST.get("choice", None)
		with transaction.atomic():
			if (choice is None) or (choice not in self.get_posible_choices()):
				# raise PermissionDenied
				pass
			else:
				context["zadosti"] = logika.apply_choice[self.stanoviste.id][choice](self.doba, self.tym)
		context["choice"] = choice
		del(context["choices"])
		return self.render_to_response(context)


class TimeoutViwe(TemplateView):
	template_name = "hra/timeout.html"