import os
from django.db import models
from plstackapi.core.models import PlCoreBase
from plstackapi.core.models import Site
from plstackapi.core.models import PLUser
from plstackapi.core.models import Role
from plstackapi.core.models import DeploymentNetwork
from plstackapi.openstack.driver import OpenStackDriver

# Create your models here.

class Slice(PlCoreBase):
    tenant_id = models.CharField(max_length=200, help_text="Keystone tenant id")
    name = models.CharField(unique=True, help_text="The Name of the Slice", max_length=80)
    enabled = models.BooleanField(default=True, help_text="Status for this Slice")
    SLICE_CHOICES = (('plc', 'PLC'), ('delegated', 'Delegated'), ('controller','Controller'), ('none','None'))
    instantiation = models.CharField(help_text="The instantiation type of the slice", max_length=80, choices=SLICE_CHOICES)
    omf_friendly = models.BooleanField()
    description=models.TextField(blank=True,help_text="High level description of the slice and expected activities", max_length=1024)
    slice_url = models.URLField(blank=True, max_length=512)
    site = models.ForeignKey(Site, related_name='slices', help_text="The Site this Node belongs too")
    network_id = models.CharField(max_length=256, help_text="Quantum network")
    router_id = models.CharField(max_length=256, help_text="Quantum router id")

    def __unicode__(self):  return u'%s' % (self.name)

    def save(self, *args, **kwds):

        driver = OpenStackDriver()
        if not self.tenant_id:
            nova_fields = {'tenant_name': self.name,
                   'description': self.description,
                   'enabled': self.enabled}
            tenant = driver.create_tenant(**nova_fields)
            self.tenant_id = tenant.id

            # create network
            network = driver.create_network(self.name)
            self.network_id = network['id']

            # create router
            router = driver.create_router(self.name)
            self.router_id = router['id']

        super(Slice, self).save(*args, **kwds)

    def delete(self, *args, **kwds):
        driver = OpenStackDriver()
        if self.tenant_id:
            driver.delete_router(self.router_id)
            driver.delete_network(self.network_id)
            driver.delete_tenant(self.tenant_id)

        super(Slice, self).delete(*args, **kwds)    

class SliceMembership(PlCoreBase):
    user = models.ForeignKey('PLUser', related_name='slice_memberships')
    slice = models.ForeignKey('Slice', related_name='slice_memberships')
    role = models.ForeignKey('Role')

    def __unicode__(self):  return u'%s %s %s' % (self.slice, self.user, self.role)