"""
This module defines the structure and properties of documents.
"""

from django.db import models
from closuretree.models import ClosureModel

from jci.models import Standard


class Audience(ClosureModel):
    name = models.CharField(max_length=50)
    parent = models.ForeignKey('self', related_name='children', null=True, blank=True)

    def __str__(self):
        return self.name

class Structure(ClosureModel):
    name = models.CharField(max_length=50)
    parent = models.ForeignKey('self', related_name='children', null=True, blank=True)

    def __str__(self):
        return self.name

class Document(models.Model):
    audience = models.ManyToManyField(Audience)
    standards = models.ManyToManyField(Standard)
    structure = models.ManyToManyField(Structure)

    def __str__(self):
        return '{} {}'.format(self.audience, self.structure)