from collections import OrderedDict


class MultipleForms(forms.Form):
    """
    Wraps many Form subclases in order to get a form wizard to treat them as one.

    Args:
        base_forms(list): Contains tuples with two elements each: name
        and class of the form we want to add.
    """

    def set_instances(self):
        for name, form in self.base_forms:
            form_instance = form(self.data, self.files, prefix=self.prefix)
            self.instances_list.append(form_instance)
            self.instances_dict.update({name: form_instance})

    def __init__(self, *args, **kwargs):
        for name, form in self.base_forms:
            self.base_fields.update(form.base_fields)
        super(MultipleForms, self).__init__(*args, **kwargs)

        self.instances_dict = OrderedDict()
        self.instances_list = list()
        if self.is_bound:
            self.set_instances()