from django.db import models
from ordered_model.models import OrderedModel, OrderedModelBase


class Item(OrderedModel):
    name = models.CharField(max_length=100)


class Question(models.Model):
    pass


class TestUser(models.Model):
    pass


class Answer(OrderedModel):
    question = models.ForeignKey(Question, on_delete=models.CASCADE, related_name='answers')
    user = models.ForeignKey(TestUser, on_delete=models.CASCADE, related_name='answers')
    order_with_respect_to = ('question', 'user')

    class Meta:
        ordering = ('question', 'user', 'order')

    def __unicode__(self):
        return u"Answer #{0:d} of question #{1:d} for user #{2:d}".format(self.order, self.question_id, self.user_id)


class CustomItem(OrderedModel):
    id = models.CharField(max_length=100, primary_key=True)
    name = models.CharField(max_length=100)
    modified = models.DateTimeField(null=True, blank=True)


class CustomOrderFieldModel(OrderedModelBase):
    sort_order = models.PositiveIntegerField(editable=False, db_index=True)
    name = models.CharField(max_length=100)
    order_field_name = 'sort_order'

    class Meta:
        ordering = ('sort_order',)


class Topping(models.Model):
    name = models.CharField(max_length=100)


class Pizza(models.Model):
    name = models.CharField(max_length=100)
    toppings = models.ManyToManyField(Topping, through='PizzaToppingsThroughModel')


class PizzaToppingsThroughModel(OrderedModel):
    pizza = models.ForeignKey(Pizza, on_delete=models.CASCADE)
    topping = models.ForeignKey(Topping, on_delete=models.CASCADE)
    order_with_respect_to = 'pizza'

    class Meta:
        ordering = ('pizza', 'order')

class BaseQuestion(OrderedModel):
    order_class_path = __module__ + '.BaseQuestion'
    question = models.TextField(max_length=100)
    class Meta:
        ordering = ('order',)

class MultipleChoiceQuestion(BaseQuestion):
    good_answer = models.TextField(max_length=100)
    wrong_answer1 = models.TextField(max_length=100)
    wrong_answer2 = models.TextField(max_length=100)
    wrong_answer3 = models.TextField(max_length=100)

class OpenQuestion(BaseQuestion):
    answer = models.TextField(max_length=100)

class ItemGroup(models.Model):
    user = models.ForeignKey(TestUser, on_delete=models.CASCADE, related_name='item_groups')

class GroupedItem(OrderedModel):
    group = models.ForeignKey(ItemGroup, on_delete=models.CASCADE, related_name='items')
    order_with_respect_to = 'group__user'