from . import interface


def hook_check_ml_restrictions(context, content):
    pass


def hook_validate_poster(context, content):
    pass


def hook_process_subscribe_queries(context, content):
    pass


def hook_generate_rcpt_list(context, content):
    listname = context.get('listname', None)
    if not listname:
        raise interface.HookStopIteration('list name not found')
    recipients_filename = ''.join([listname, '-recipents.txt'])
    try:
        with open(recipients_filename, encoding='utf8') as fi:
            recipients = [recipient for recipient in fi]
            context['recipients'] = recipients
    except FileNotFoundError as e:
        n = interface.HookAbortError('recipients list not found')
        n.args.append({'listname': listname,
                       'recipients_filename': recipients_filename})
        raise n from e


def hook_send_all(context, content):
    recipients = context.get('recipients', None)
    if not recipients:
        raise interface.HookStopIteration()
    # TODO: how to send emails here ?