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from django.db import models
from colorful.fields import RGBColorField
from django.conf import settings
from django.utils.translation import ugettext_lazy as _

null_args = dict(null=True, blank=True)


class Creation(models.Model):
    author = models.ForeignKey(settings.AUTH_USER_MODEL)
    created = models.DateTimeField(_('created time'), auto_now_add=True)
    updated = models.DateTimeField(_('Updated time'), null=True)

    class Meta:
        abstract = True


class Topic(Creation):
    title = models.CharField(max_length=300, unique=True)
    body = models.TextField()
    tags = models.ManyToManyField('Tag', related_name='topics', blank=True)


class Comment(Creation):
    topic = models.ForeignKey(Topic)
    body = models.TextField()


class Tag(Creation):
    name = models.CharField(_('name'), max_length=64)
    color = RGBColorField(**null_args)