from django.contrib.auth import get_user_model
from django.db import models

# Create your models here.
from django_extensions.db.models import TitleDescriptionModel

from book.models import Module


class ObjectiveGroup(TitleDescriptionModel):
    class Meta:
        verbose_name = 'Lernziel Gruppe'
        verbose_name_plural = 'Lernziel Gruppen'

    module = models.ForeignKey(Module, blank=False, null=False, on_delete=models.CASCADE)
    user = models.ForeignKey(get_user_model(), blank=True, null=True, on_delete=models.CASCADE)
    # klass = models.ForeignKey(Klass, null=True, on_delete=models.CASCADE)

    def __str__(self):
        return 'ObjectiveGroup {}-{}-{}'.format(self.id, self.module, self.title)


class Objective(TitleDescriptionModel):
    class Meta:
        verbose_name = 'Lernziel'
        verbose_name_plural = 'Lernziele'

    # several competence entries are grouped in current focus
    group = models.ForeignKey(ObjectiveGroup, blank=False, null=False, on_delete=models.CASCADE)

    def __str__(self):
        return 'Objective {}-{}'.format(self.id, self.title)


class ObjectiveProgressStatus(TitleDescriptionModel):
    class Meta:
        verbose_name = 'Lernzielstatus'
        verbose_name_plural = 'Lernzielstatus'

    objective = models.ForeignKey(Objective, blank=False, null=False, on_delete=models.CASCADE)
    user = models.ForeignKey(get_user_model(), blank=True, null=True, on_delete=models.CASCADE)

    def __str__(self):
        return 'Lernzielstatus {}-{}'.format(self.objective, self.title)