from django.db import models
from django.contrib.auth.models import User
from django.core.validators import RegexValidator


# Create your models here.
class BorgRepository(models.Model):
    name = models.CharField(
        max_length=100,
        validators=[
            RegexValidator(
                r"[a-zA-Z0-9\-_]+", message="Only a-z, A-Z, 0-9, - and _ are allowed."
            )
        ],
    )
    key = models.TextField(
        validators=[
            RegexValidator(
                r"(ssh\-rsa|ecdsa\-sha2\-nistp256|ssh\-ed25519) ([a-zA-Z0-9\+/]+) (\S*)",
                message="not a valid SSH public key.",
            ),
        ]
    )
    user = models.ForeignKey(User, on_delete=models.CASCADE)

    class Meta:
        constraints = [
            models.UniqueConstraint(
                fields=("name", "user"), name="BorgRepository_name_user_unique"
            )
        ]

    def __str__(self):
        return f"BorgRepository '{self.user.username}' - '{self.name}' ({self.pk})"

    @property
    def username(self) -> str:
        """Returns the username of the linux user account for this user."""
        return f"u-{self.pk}"

    @property
    def repo_url(self) -> str:
        return f"{settings.BACKUP_USER}@{settings.BACKUP_REPO_HOST}:{self.user.pk}/{self.pk}"

    def save(self):
        from .tasks import update_user

        update_user.enqueue(user_pk=self.user.pk)
        super().save()

    def delete(self):
        from .tasks import update_user

        super().delete()
        update_user.enqueue(user_pk=self.user.pk)


class Voucher(models.Model):
    used = models.BooleanField(default=False)
    code = models.CharField(max_length=100, unique=True)

    def __str__(self):
        return f"Voucher '{self.code}'"