import os
from django.db import models
from core.models import PlCoreBase
from core.models import Slice

class SliceTag(PlCoreBase):
    slice = models.ForeignKey(Slice, related_name='slicetags')

    NAME_CHOICES = (('privatekey', 'Private Key'), ('publickey', 'Public Key'))
    name = models.CharField(help_text="The name of this tag", max_length=30, choices=NAME_CHOICES)
    value = models.CharField(help_text="The value of this tag", max_length=1024)

    def can_update(self, user):
        return self.slice.can_update(user)

    def save_by_user(self, user, *args, **kwds):
        if self.can_update(user):
            super(SliceTag, self).save(*args, **kwds)

    @staticmethod
    def select_by_user(user):
        if user.is_admin:
            qs = SliceTag.objects.all()
        else:
            st_ids = [st.id for st in SliceTag.objects.filter(user=user)]
            qs = SliceTag.objects.filter(id__in=st_ids)
        return qs