from django.contrib.auth.models import User

from django.db import models

class Band(models.Model):

    name = models.CharField(max_length=100)

    bio = models.TextField()

    sign_date = models.DateField()

    class Meta:

        ordering = ("name",)

    def __str__(self):

        return self.name

class Song(models.Model):

    name = models.CharField(max_length=100)

    band = models.ForeignKey(Band, models.CASCADE)

    featuring = models.ManyToManyField(Band, related_name="featured")

    def __str__(self):

        return self.name

class Concert(models.Model):

    main_band = models.ForeignKey(Band, models.CASCADE, related_name="main_concerts")

    opening_band = models.ForeignKey(

        Band, models.CASCADE, related_name="opening_concerts", blank=True

    )

    day = models.CharField(max_length=3, choices=((1, "Fri"), (2, "Sat")))

    transport = models.CharField(

        max_length=100, choices=((1, "Plane"), (2, "Train"), (3, "Bus")), blank=True

    )

class ValidationTestModel(models.Model):

    name = models.CharField(max_length=100)

    slug = models.SlugField()

    users = models.ManyToManyField(User)

    state = models.CharField(

        max_length=2, choices=(("CO", "Colorado"), ("WA", "Washington"))

    )

    is_active = models.BooleanField(default=False)

    pub_date = models.DateTimeField()

    band = models.ForeignKey(Band, models.CASCADE)

    best_friend = models.OneToOneField(User, models.CASCADE, related_name="best_friend")

    # This field is intentionally 2 characters long (#16080).

    no = models.IntegerField(verbose_name="Number", blank=True, null=True)

    def decade_published_in(self):

        return self.pub_date.strftime("%Y")[:3] + "0's"

class ValidationTestInlineModel(models.Model):

    parent = models.ForeignKey(ValidationTestModel, models.CASCADE)