from django.contrib import messages
from django.views.generic.base import TemplateResponseMixin, View
from django.views.generic.edit import FormView, ContextMixin, FormMixin, UpdateView
from django.contrib.auth.decorators import login_required
from django.core.urlresolvers import reverse_lazy

from .forms import DemoUserEditForm

class MyModelInstanceMixin(FormMixin):
    def get_model_instance(self):
        return None

    def get_form_kwargs(self):
        kwargs = super(MyModelInstanceMixin, self).get_form_kwargs()
        instance = self.get_model_instance()
        if instance:
            kwargs.update({'instance': instance})
        return instance


class DemoUserEditView(UpdateView):
    """Allow view and update of basic user data.

    In practice this view edits a model, and that model is
    the DemoUser object itself, specifically the names that
    a user has.

    The key to updating an existing model, as compared to creating
    a model (i.e. adding a new row to a database) by using the
    Django generic view ``UpdateView``, specifically the
    ``get_object`` method.
    """
    form_class = DemoUserEditForm
    template_name = "auth/profile.html"
    #success_url = '/email-sent/'
    view_name = 'account_profile'
    success_url = reverse_lazy(view_name)

    def get_object(self):
        return self.request.user

    def form_valid(self, form):
        # TODO: not sure how to enforce *minimum* length of a field.
        #print "form valid..."
        #print "save to user:", self.request.user, form.cleaned_data
        form.save()
        messages.add_message(self.request, messages.INFO, 'User profile updated')
        return super(DemoUserEditView, self).form_valid(form)


account_profile = login_required(DemoUserEditView.as_view())