from django.conf import settings
from django.db import models
from django.utils.translation import ugettext as _


# Move timestampable to a separate behaviors.py file
class Timestampable(models.Model):
    """Abstract base class that provides auto-updating created and modified timestamps"""
    created = models.DateTimeField(_('Created'), auto_now_add=True, db_index=True, help_text=_('Created timestamp'))
    modified = models.DateTimeField(_('Modified'), auto_now=True, db_index=True, help_text=_('Last modified timestamp'))

    class Meta:
        abstract = True


class Category(Timestampable, models.Model):
    """Comment about the purpose of this model"""
    name = models.CharField(_('Name'), max_length=25, db_index=True, help_text=_('The name of the category'))
    submit_date = models.DateTimeField(_('Submitted'), editable=False, help_text=_('When the category was submitted'))
    edit_date = models.DateTimeField(_('Editted'), editable=True, help_text=_('The last time the category was editted'))

    submit_user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
    edit_user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)

    # Custom manager: https://docs.djangoproject.com/en/1.10/topics/db/managers/#from-queryset
    # objects = managers.CategoryManager.from_queryset(querysets.CategoryQueryset)()

    class Meta:
        verbose_name = _('Category')
        verbose_name_plural = _('Categories')

    def __str__(self):
        return self.name