from django.db import models
from entries.models import Entry
from model_utils.models import TimeStampedModel


class State:
    PENDING = "p"
    VALID = "v"
    INVALID = "i"
    DELETED = "d"
    CHOICES = (
        (PENDING, "pending"),
        (VALID, "valid"),
        (INVALID, "invalid"),
        (DELETED, "deleted"),
    )


class Webmention(TimeStampedModel):
    entry = models.ForeignKey(Entry, on_delete=models.CASCADE)
    source = models.CharField(max_length=255)
    target = models.CharField(max_length=255)
    state = models.CharField(choices=State.CHOICES, default=State.PENDING, max_length=1)

    class Meta:
        default_related_name = "mentions"
        unique_together = ("source", "target")