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


def avatar_path(instance, name):
    return 'avatars/{id}/{name}'.format(id=instance.id, name=name)


class Site(models.Model):
    name = models.CharField(max_length=100, unique=True)
    icon = models.CharField(max_length=100)
    url = models.CharField(max_length=100)

    def __str__(self):
        return self.name

    class Meta:
        ordering = ('name',)


class User(AbstractUser):
    avatar = models.ImageField(upload_to=avatar_path)
    note = models.TextField(blank=True)


class Profile(models.Model):
    user = models.ForeignKey(
        User,
        related_name='profiles',
        on_delete=models.CASCADE
    )
    site = models.ForeignKey(Site, on_delete=models.CASCADE)
    username = models.CharField(max_length=100)
    display_name = models.CharField(max_length=100, blank=True)

    def __str__(self):
        return '{name}@{site}'.format(name=self.username, site=self.site)

    @property
    def name(self):
        return self.display_name or self.username

    @property
    def url(self):
        return self.site.url.format(username=self.username)

    class Meta:
        ordering = ('site', 'username')


class Key(models.Model):
    user = models.ForeignKey(
        User,
        related_name='keys',
        on_delete=models.CASCADE
    )
    fingerprint = models.CharField(max_length=40)
    file = models.FileField(upload_to='keys')

    @property
    def key_id(self): return self.fingerprint[32:]

    def __str__(self):
        return self.key_id

    def pretty_print(self):
        return " ".join(self.fingerprint[i:i+4] for i in range(0, 40, 4))