from django.views.generic.detail import SingleObjectMixin
from django.shortcuts import redirect
from django.urls import reverse
from . import models
from django.contrib import messages


class CreateProposalMixin(SingleObjectMixin):
    def form_valid(self, form):
        # set camp and user before saving
        form.instance.camp = self.camp
        form.instance.user = self.request.user
        speaker = form.save()
        return redirect(reverse('proposal_list', kwargs={'camp_slug': self.camp.slug}))


class EnsureUnapprovedProposalMixin(SingleObjectMixin):
    def dispatch(self, request, *args, **kwargs):
        # do not permit editing if the proposal is already approved
        if self.get_object().proposal_status == models.UserSubmittedModel.PROPOSAL_APPROVED:
            messages.error(request, "This proposal has already been approved. Please contact the organisers if you need to modify something.")
            return redirect(reverse('proposal_list', kwargs={'camp_slug': self.camp.slug}))

        # alright, continue with the request
        return super().dispatch(request, *args, **kwargs)


class EnsureWritableCampMixin(SingleObjectMixin):
    def dispatch(self, request, *args, **kwargs):
        # do not permit view if camp is in readonly mode
        if self.camp.read_only:
            messages.error(request, "No thanks")
            return redirect(reverse('proposal_list', kwargs={'camp_slug': self.camp.slug}))

        # alright, continue with the request
        return super().dispatch(request, *args, **kwargs)


class EnsureUserOwnsProposalMixin(SingleObjectMixin):
    def dispatch(self, request, *args, **kwargs):
        # make sure that this proposal belongs to the logged in user
        if self.get_object().user.username != request.user.username:
            messages.error(request, "No thanks")
            return redirect(reverse('proposal_list', kwargs={'camp_slug': self.camp.slug}))

        # alright, continue with the request
        return super().dispatch(request, *args, **kwargs)