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


class Section(models.Model):
    name = models.CharField(max_length=255)

    def __str__(self):
        return self.name

    class Meta:
        ordering = ('name',)


class Headline(models.Model):
    name = models.CharField(max_length=255)
    section = models.ForeignKey(Section, null=True, blank=True)

    def __str__(self):
        return self.name


class Goal(ClosureModel):
    name = models.CharField(max_length=255, unique=True)
    parent = models.ForeignKey('self', related_name='children', null=True, blank=True)
    acronym = models.CharField(max_length=10, blank=True, null=True)
    overview = models.TextField(max_length=2000, null=True, blank=True)
    order = models.IntegerField(blank=True, null=True)
    headline = models.ForeignKey(Headline, blank=True, null=True)

    def __str__(self):
        return self.name


class Standard(ClosureModel):
    name = models.CharField(max_length=255)
    parent = models.ForeignKey('self', related_name='children', null=True, blank=True)
    goal = models.ForeignKey(Goal, related_name='standards')

    @property
    def goal_acronym(self):
        return self.goal.get_root().name

    @property
    def structure(self):
        return '.'.join([x.order if x.order else x.name for x in self.goal.get_ancestors()])

    def __str__(self):
        return self.name