from django.urls import reverse_lazy
from django.views.generic import FormView

from account.forms import RegisterAccountForm
from account.usecases import RegisterUserAccount


class RegisterView(FormView):
    template_name = 'account/register.html'
    form_class = RegisterAccountForm
    success_url = reverse_lazy('summary')

    def post(self, request, *args, **kwargs):
        form = self.get_form()

        if form.is_valid():
            self._run_use_case(form)
            if form.errors:
                return self.form_invalid(form)
            else:
                return self.form_valid(form)
        else:
            return self.form_invalid(form)

    def _run_use_case(self, form):
        usecase = RegisterUserAccount(
            username=form.data['username'],
            password=form.data['password'],
            first_name=form.data['first_name'],
            last_name=form.data['last_name']
        )

        # handle the output, even if it is an error.
        try:
            usecase.execute()
        except UsernameAlreadyExistError as err:
            form.add_error('username', str(err))