class MinsaLoginView(FormView):
    template_name = 'minsalogin/login.html'
    form_class = LoginForm

    def dispatch(self, request, *args, **kwargs):
        if request.session.get('auth_token', ''):
            return HttpResponseRedirect('/')
        return super(MinsaLoginView, self).dispatch(request)

    def form_valid(self, form):
        username = form.cleaned_data['username']
        password = form.cleaned_data['password']
        payload = {'username': username, 'password': password}
        d = requests.post('{}auth/login/'.format(URL_LOGIN_SERVER), payload)
        if d.status_code == 200:
            d = d.json()
            if d.get('auth_token'):
                self.request.session['auth_token'] = d.get('auth_token')
            else:
                return self.form_invalid(form)
        elif d.status_code == 400:
            messages.warning(self.request, "Error al ingresar con la credenciales proporcionadas")

        return super(MinsaLoginView, self).form_valid(form)

    def form_invalid(self, form):
        return self.render_to_response(self.get_context_data(form=form, login_error=True))

    def get_success_url(self):
        next = self.request.GET.get('next', None)
        if next is not None:
            return next
        return '/'