from __future__ import unicode_literals

import datetime
import uuid

from django.db import models
from django.utils import six
from django.utils.encoding import python_2_unicode_compatible


@python_2_unicode_compatible
class Author(models.Model):
    name = models.CharField(max_length=100)

    class Meta:
        ordering = ('name',)

    def __str__(self):
        return self.name


class BetterAuthor(Author):
    write_speed = models.IntegerField()


@python_2_unicode_compatible
class Book(models.Model):
    author = models.ForeignKey(Author, models.CASCADE)
    title = models.CharField(max_length=100)

    class Meta:
        unique_together = (
            ('author', 'title'),
        )
        ordering = ['id']

    def __str__(self):
        return self.title

    def clean(self):
        # Ensure author is always accessible in clean method
        assert self.author.name is not None


@python_2_unicode_compatible
class BookWithCustomPK(models.Model):
    my_pk = models.DecimalField(max_digits=5, decimal_places=0, primary_key=True)
    author = models.ForeignKey(Author, models.CASCADE)
    title = models.CharField(max_length=100)

    def __str__(self):
        return '%s: %s' % (self.my_pk, self.title)


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


@python_2_unicode_compatible
class BookWithOptionalAltEditor(models.Model):
    author = models.ForeignKey(Author, models.CASCADE)
    # Optional secondary author
    alt_editor = models.ForeignKey(Editor, models.SET_NULL, blank=True, null=True)
    title = models.CharField(max_length=100)

    class Meta:
        unique_together = (
            ('author', 'title', 'alt_editor'),
        )

    def __str__(self):
        return self.title


@python_2_unicode_compatible
class AlternateBook(Book):
    notes = models.CharField(max_length=100)

    def __str__(self):
        return '%s - %s' % (self.title, self.notes)


@python_2_unicode_compatible
class AuthorMeeting(models.Model):
    name = models.CharField(max_length=100)
    authors = models.ManyToManyField(Author)
    created = models.DateField(editable=False)

    def __str__(self):
        return self.name


class CustomPrimaryKey(models.Model):
    my_pk = models.CharField(max_length=10, primary_key=True)
    some_field = models.CharField(max_length=100)


# models for inheritance tests.


@python_2_unicode_compatible
class Place(models.Model):
    name = models.CharField(max_length=50)
    city = models.CharField(max_length=50)

    def __str__(self):
        return self.name


@python_2_unicode_compatible
class Owner(models.Model):
    auto_id = models.AutoField(primary_key=True)
    name = models.CharField(max_length=100)
    place = models.ForeignKey(Place, models.CASCADE)

    def __str__(self):
        return "%s at %s" % (self.name, self.place)


class Location(models.Model):
    place = models.ForeignKey(Place, models.CASCADE, unique=True)
    # this is purely for testing the data doesn't matter here :)
    lat = models.CharField(max_length=100)
    lon = models.CharField(max_length=100)


@python_2_unicode_compatible
class OwnerProfile(models.Model):
    owner = models.OneToOneField(Owner, models.CASCADE, primary_key=True)
    age = models.PositiveIntegerField()

    def __str__(self):
        return "%s is %d" % (self.owner.name, self.age)


@python_2_unicode_compatible
class Restaurant(Place):
    serves_pizza = models.BooleanField(default=False)

    def __str__(self):
        return self.name


@python_2_unicode_compatible
class Product(models.Model):
    slug = models.SlugField(unique=True)

    def __str__(self):
        return self.slug


@python_2_unicode_compatible
class Price(models.Model):
    price = models.DecimalField(max_digits=10, decimal_places=2)
    quantity = models.PositiveIntegerField()

    def __str__(self):
        return "%s for %s" % (self.quantity, self.price)

    class Meta:
        unique_together = (('price', 'quantity'),)


class MexicanRestaurant(Restaurant):
    serves_tacos = models.BooleanField(default=False)


class ClassyMexicanRestaurant(MexicanRestaurant):
    the_restaurant = models.OneToOneField(MexicanRestaurant, models.CASCADE, parent_link=True, primary_key=True)
    tacos_are_yummy = models.BooleanField(default=False)


# models for testing unique_together validation when a fk is involved and
# using inlineformset_factory.
@python_2_unicode_compatible
class Repository(models.Model):
    name = models.CharField(max_length=25)

    def __str__(self):
        return self.name


@python_2_unicode_compatible
class Revision(models.Model):
    repository = models.ForeignKey(Repository, models.CASCADE)
    revision = models.CharField(max_length=40)

    class Meta:
        unique_together = (("repository", "revision"),)

    def __str__(self):
        return "%s (%s)" % (self.revision, six.text_type(self.repository))


# models for testing callable defaults (see bug #7975). If you define a model
# with a callable default value, you cannot rely on the initial value in a
# form.
class Person(models.Model):
    name = models.CharField(max_length=128)


class Membership(models.Model):
    person = models.ForeignKey(Person, models.CASCADE)
    date_joined = models.DateTimeField(default=datetime.datetime.now)
    karma = models.IntegerField()


# models for testing a null=True fk to a parent
class Team(models.Model):
    name = models.CharField(max_length=100)


@python_2_unicode_compatible
class Player(models.Model):
    team = models.ForeignKey(Team, models.SET_NULL, null=True)
    name = models.CharField(max_length=100)

    def __str__(self):
        return self.name


# Models for testing custom ModelForm save methods in formsets and inline formsets
@python_2_unicode_compatible
class Poet(models.Model):
    name = models.CharField(max_length=100)

    def __str__(self):
        return self.name


@python_2_unicode_compatible
class Poem(models.Model):
    poet = models.ForeignKey(Poet, models.CASCADE)
    name = models.CharField(max_length=100)

    def __str__(self):
        return self.name


@python_2_unicode_compatible
class Post(models.Model):
    title = models.CharField(max_length=50, unique_for_date='posted', blank=True)
    slug = models.CharField(max_length=50, unique_for_year='posted', blank=True)
    subtitle = models.CharField(max_length=50, unique_for_month='posted', blank=True)
    posted = models.DateField()

    def __str__(self):
        return self.name


# Models for testing UUID primary keys
class UUIDPKParent(models.Model):
    uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    name = models.CharField(max_length=255)


class UUIDPKChild(models.Model):
    uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    name = models.CharField(max_length=255)
    parent = models.ForeignKey(UUIDPKParent, models.CASCADE)


class ChildWithEditablePK(models.Model):
    name = models.CharField(max_length=255, primary_key=True)
    parent = models.ForeignKey(UUIDPKParent, models.CASCADE)


class AutoPKChildOfUUIDPKParent(models.Model):
    name = models.CharField(max_length=255)
    parent = models.ForeignKey(UUIDPKParent, models.CASCADE)


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


class UUIDPKChildOfAutoPKParent(models.Model):
    uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    name = models.CharField(max_length=255)
    parent = models.ForeignKey(AutoPKParent, models.CASCADE)


class ParentWithUUIDAlternateKey(models.Model):
    uuid = models.UUIDField(unique=True, default=uuid.uuid4, editable=False)
    name = models.CharField(max_length=50)


class ChildRelatedViaAK(models.Model):
    name = models.CharField(max_length=255)
    parent = models.ForeignKey(ParentWithUUIDAlternateKey, models.CASCADE, to_field='uuid')
