from hmac import compare_digest

from django.contrib import messages
from django.shortcuts import redirect
from django.urls import reverse
from django.utils.translation import gettext_lazy as _
from django.views.generic import FormView, TemplateView
from pretalx.common.mixins.views import EventPermissionRequired

from .forms import MusicrateSettingsForm


class JoinView(TemplateView):
    template_name = "pretalx_musicrate/join.html"

    def validate_token(self, token):
        if compare_digest(
            token.encode("utf-8"),
            self.request.event.pretalx_musicrate_settings.join_token.encode("utf-8"),
        ):
            return True
        messages.error(self.request, _("Invalid token"))
        return False

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

    def get(self, request, *args, token, **kwargs):
        token_valid = self.validate_token(token)
        return super().get(request, *args, token_valid=token_valid, **kwargs)

    def post(self, request, *args, token, **kwargs):
        token_valid = self.validate_token(token)
        if token_valid:
            return redirect(request.path)
        return self.render_to_response(
            self.get_context_data(token_valid=token_valid, **kwargs)
        )


class MusicrateSettingsView(EventPermissionRequired, FormView):
    permission_required = "orga.change_settings"
    template_name = "pretalx_musicrate/settings.html"
    form_class = MusicrateSettingsForm

    def get_success_url(self):
        return self.request.path

    def get_form_kwargs(self):
        kwargs = super().get_form_kwargs()
        kwargs["event"] = self.request.event
        return kwargs

    def form_valid(self, form):
        form.save()
        messages.success(
            self.request, _("The pretalx-musicrate settings were updated.")
        )
        return super().form_valid(form)


class QRCodeView(EventPermissionRequired, TemplateView):
    permission_required = "orga.view_submissions"
    template_name = "pretalx_musicrate/qrcode.html"

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context["contents"] = self.request.build_absolute_uri(
            reverse(
                "plugins:pretalx_musicrate:join",
                kwargs={
                    "event": self.request.event.slug,
                    "token": self.request.event.pretalx_musicrate_settings.join_token,
                },
            )
        )
        return context