# Copyright (c) 2016 Ansible, Inc.
# All Rights Reserved.

# Django
from django.db import models
from django.utils.translation import gettext_lazy as _

# AWX
from awx.api.versioning import reverse
from awx.main.models.base import CommonModelNameNotUnique
from awx.main.models.unified_jobs import UnifiedJobTemplate, UnifiedJob
from awx.main.models.inventory import Inventory

__all__ = ('Label',)


class Label(CommonModelNameNotUnique):
    """
    Generic Tag. Designed for tagging Job Templates, but expandable to other models.
    """

    class Meta:
        app_label = 'main'
        unique_together = (("name", "organization"),)
        ordering = ('organization', 'name')

    organization = models.ForeignKey(
        'Organization',
        related_name='labels',
        help_text=_('Organization this label belongs to.'),
        on_delete=models.CASCADE,
    )

    def get_absolute_url(self, request=None):
        return reverse('api:label_detail', kwargs={'pk': self.pk}, request=request)

    @staticmethod
    def get_orphaned_labels():
        return Label.objects.filter(organization=None, unifiedjobtemplate_labels__isnull=True, inventory_labels__isnull=True)

    def is_detached(self):
        return Label.objects.filter(id=self.id, unifiedjob_labels__isnull=True, unifiedjobtemplate_labels__isnull=True, inventory_labels__isnull=True).exists()

    def is_candidate_for_detach(self):

        c1 = UnifiedJob.objects.filter(labels__in=[self.id]).count()
        c2 = UnifiedJobTemplate.objects.filter(labels__in=[self.id]).count()
        c3 = Inventory.objects.filter(labels__in=[self.id]).count()
        return (c1 + c2 + c3 - 1) == 0