from django.db import models


# Duplicate to avoid circular import to provide values for status field
class TwilioCallStatuses:
    QUEUED = 10
    RINGING = 20
    IN_PROGRESS = 30
    COMPLETED = 40
    BUSY = 50
    FAILED = 60
    NO_ANSWER = 70
    CANCELED = 80

    CHOICES = (
        (QUEUED, "queued"),
        (RINGING, "ringing"),
        (IN_PROGRESS, "in-progress"),
        (COMPLETED, "completed"),
        (BUSY, "busy"),
        (FAILED, "failed"),
        (NO_ANSWER, "no-answer"),
        (CANCELED, "canceled"),
    )


class PhoneCallRecord(models.Model):
    class Meta:
        db_table = "twilioapp_phonecall"

    exceeded_limit = models.BooleanField(null=True, default=None)
    represents_alert = models.ForeignKey(
        "alerts.Alert", on_delete=models.SET_NULL, null=True, default=None
    )  # deprecateed
    represents_alert_group = models.ForeignKey("alerts.AlertGroup", on_delete=models.SET_NULL, null=True, default=None)
    notification_policy = models.ForeignKey(
        "base.UserNotificationPolicy", on_delete=models.SET_NULL, null=True, default=None
    )

    receiver = models.ForeignKey("user_management.User", on_delete=models.CASCADE, null=True, default=None)

    created_at = models.DateTimeField(auto_now_add=True)

    grafana_cloud_notification = models.BooleanField(default=False)  # rename

    # deprecated. It's here for backward compatibility for calls made during or shortly before migration.
    # Should be removed soon after migration
    status = models.PositiveSmallIntegerField(
        blank=True,
        null=True,
        choices=TwilioCallStatuses.CHOICES,
    )

    sid = models.CharField(
        blank=True,
        max_length=50,
    )


class ProviderPhoneCall(models.Model):
    """
    ProviderPhoneCall is an interface between PhoneCallRecord and call data returned from PhoneProvider.
    Concrete provider phone call should be inherited from ProviderPhoneCall.

    Some phone providers allows to track status of call or gather pressed digits (we use it to ack/resolve alert group).
    It is needed to link phone call and alert group without exposing internals of concrete phone provider to PhoneBackend.
    """

    class Meta:
        abstract = True

    phone_call_record = models.OneToOneField(
        "phone_notifications.PhoneCallRecord",
        on_delete=models.CASCADE,
        related_name="%(app_label)s_%(class)s_related",
        related_query_name="%(app_label)s_%(class)ss",
        null=False,
    )

    def link_and_save(self, phone_call_record: PhoneCallRecord):
        self.phone_call_record = phone_call_record
        self.save()