from collections import OrderedDict

from django.db import models
from django.db.models.base import ModelBase
from django.utils.translation import ugettext_lazy as _

MAPITEM_TYPES = OrderedDict()


class MapItemMeta(ModelBase):
    def __new__(mcs, name, bases, attrs):
        cls = super().__new__(mcs, name, bases, attrs)
        if not cls._meta.abstract:
            MAPITEM_TYPES[name.lower()] = cls
        return cls


class MapItem(models.Model, metaclass=MapItemMeta):
    name = models.SlugField(_('Name'), unique=True, max_length=50)
    package = models.ForeignKey('mapdata.Package', on_delete=models.CASCADE, verbose_name=_('map package'))

    EditorForm = None

    @classmethod
    def get_path_prefix(cls):
        return cls._meta.default_related_name + '/'

    @classmethod
    def get_path_regex(cls):
        return r'^' + cls.get_path_prefix()

    def get_filename(self):
        return self._meta.default_related_name + '/' + self.name + '.json'

    @classmethod
    def fromfile(cls, data, file_path):
        kwargs = {}
        return kwargs

    def tofile(self):
        return OrderedDict()

    class Meta:
        abstract = True