import tempfile
import uuid

from django.contrib.auth.models import User
from django.core.files.storage import FileSystemStorage
from django.db import models

try:
    from PIL import Image
except ImportError:
    Image = None
else:
    temp_storage_dir = tempfile.mkdtemp()
    temp_storage = FileSystemStorage(temp_storage_dir)


class MyFileField(models.FileField):
    pass


class Member(models.Model):
    name = models.CharField(max_length=100)
    birthdate = models.DateTimeField(blank=True, null=True)
    gender = models.CharField(
        max_length=1, blank=True, choices=[("M", "Male"), ("F", "Female")]
    )
    email = models.EmailField(blank=True)

    def __str__(self):
        return self.name


class Artist(models.Model):
    pass


class Band(Artist):
    uuid = models.UUIDField(unique=True, default=uuid.uuid4)
    name = models.CharField(max_length=100)
    style = models.CharField(max_length=20)
    members = models.ManyToManyField(Member)

    def __str__(self):
        return self.name


class UnsafeLimitChoicesTo(models.Model):
    band = models.ForeignKey(
        Band,
        models.CASCADE,
        limit_choices_to={"name": '"&><escapeme'},
    )


class Album(models.Model):
    band = models.ForeignKey(Band, models.CASCADE, to_field="uuid")
    featuring = models.ManyToManyField(Band, related_name="featured")
    name = models.CharField(max_length=100)
    cover_art = models.FileField(upload_to="albums")
    backside_art = MyFileField(upload_to="albums_back", null=True)

    def __str__(self):
        return self.name


class ReleaseEvent(models.Model):
    """
    Used to check that autocomplete widget correctly resolves attname for FK as
    PK example.
    """

    album = models.ForeignKey(Album, models.CASCADE, primary_key=True)
    name = models.CharField(max_length=100)

    class Meta:
        ordering = ["name"]

    def __str__(self):
        return self.name


class VideoStream(models.Model):
    release_event = models.ForeignKey(ReleaseEvent, models.CASCADE)


class HiddenInventoryManager(models.Manager):
    def get_queryset(self):
        return super().get_queryset().filter(hidden=False)


class Inventory(models.Model):
    barcode = models.PositiveIntegerField(unique=True)
    parent = models.ForeignKey(
        "self", models.SET_NULL, to_field="barcode", blank=True, null=True
    )
    name = models.CharField(blank=False, max_length=20)
    hidden = models.BooleanField(default=False)

    # see #9258
    default_manager = models.Manager()
    objects = HiddenInventoryManager()

    def __str__(self):
        return self.name


class Event(models.Model):
    main_band = models.ForeignKey(
        Band,
        models.CASCADE,
        limit_choices_to=models.Q(pk__gt=0),
        related_name="events_main_band_at",
    )
    supporting_bands = models.ManyToManyField(
        Band,
        blank=True,
        related_name="events_supporting_band_at",
        help_text="Supporting Bands.",
    )
    start_date = models.DateField(blank=True, null=True)
    start_time = models.TimeField(blank=True, null=True)
    description = models.TextField(blank=True)
    link = models.URLField(blank=True)
    min_age = models.IntegerField(blank=True, null=True)


class Car(models.Model):
    owner = models.ForeignKey(User, models.CASCADE)
    make = models.CharField(max_length=30)
    model = models.CharField(max_length=30)

    def __str__(self):
        return "%s %s" % (self.make, self.model)


class CarTire(models.Model):
    """
    A single car tire. This to test that a user can only select their own cars.
    """

    car = models.ForeignKey(Car, models.CASCADE)


class Honeycomb(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    location = models.CharField(max_length=20)


class Bee(models.Model):
    """
    A model with a FK to a model that won't be registered with the admin
    (Honeycomb) so the corresponding raw ID widget won't have a magnifying
    glass link to select related honeycomb instances.
    """

    honeycomb = models.ForeignKey(Honeycomb, models.CASCADE)


class Individual(models.Model):
    """
    A model with a FK to itself. It won't be registered with the admin, so the
    corresponding raw ID widget won't have a magnifying glass link to select
    related instances (rendering will be called programmatically in this case).
    """

    name = models.CharField(max_length=20)
    parent = models.ForeignKey("self", models.SET_NULL, null=True)
    soulmate = models.ForeignKey(
        "self", models.CASCADE, null=True, related_name="soulmates"
    )


class Company(models.Model):
    name = models.CharField(max_length=20)


class Advisor(models.Model):
    """
    A model with a m2m to a model that won't be registered with the admin
    (Company) so the corresponding raw ID widget won't have a magnifying
    glass link to select related company instances.
    """

    name = models.CharField(max_length=20)
    companies = models.ManyToManyField(Company)


class Student(models.Model):
    name = models.CharField(max_length=255)
    if Image:
        photo = models.ImageField(
            storage=temp_storage, upload_to="photos", blank=True, null=True
        )

    class Meta:
        ordering = ("name",)

    def __str__(self):
        return self.name


class School(models.Model):
    name = models.CharField(max_length=255)
    students = models.ManyToManyField(Student, related_name="current_schools")
    alumni = models.ManyToManyField(Student, related_name="previous_schools")

    def __str__(self):
        return self.name


class Profile(models.Model):
    user = models.ForeignKey("auth.User", models.CASCADE, to_field="username")

    def __str__(self):
        return self.user.username