import os
import base64
from collections import defaultdict
from netaddr import IPAddress, IPNetwork
from django.db.models import F, Q
from planetstack.config import Config
from observer.openstacksyncstep import OpenStackSyncStep
from core.models.slice import Slice, ControllerSlices
from core.models.controllerusers import ControllerUsers
from util.logger import Logger, logging
from observer.ansible import *

logger = Logger(level=logging.INFO)

class SyncControllerSlices(OpenStackSyncStep):
    provides=[ControllerSlices]
    requested_interval=0

    def fetch_pending(self, deleted):
        if (deleted):
            return ControllerSlices.deleted_objects.all()
        else:
            return ControllerSlices.objects.filter(Q(enacted__lt=F('updated')) | Q(enacted=None))

    def sync_record(self, controller_slice):
        logger.info("sync'ing slice controller %s" % controller_slice)

        if not controller_slice.controller.admin_user:
            logger.info("controller %r has no admin_user, skipping" % controller_slice.controller)
            return

        controller_users = ControllerUsers.objects.filter(user=controller_slice.slice.creator,
                                                             controller=controller_slice.controller)
        if not controller_users:
            raise Exception("slice createor %s has not accout at controller %s" % (controller_slice.slice.creator, controller_slice.controller.name))
        else:
            controller_user = controller_users[0]
            roles = ['admin']

        max_instances=int(controller_slice.slice.max_slivers)
        tenant_fields = {'endpoint':controller_slice.controller.auth_url,
                         'admin_user': controller_slice.controller.admin_user,
                         'admin_password': controller_slice.controller.admin_password,
                         'admin_tenant': 'admin',
                         'tenant': controller_slice.slice.name,
                         'tenant_description': controller_slice.slice.description,
                         'roles':roles,
                         'name':controller_user.user.email,
                         'ansible_tag':'%s@%s'%(controller_slice.slice.name,controller_slice.controller.name),
                         'max_instances':max_instances}

        res = run_template('sync_controller_slices.yaml', tenant_fields, path='controller_slices')
        expected_num = len(roles)+1
        if (len(res)!=expected_num):
            raise Exception('Could not sync tenants for slice %s'%controller_slice.slice.name)
        else:
            tenant_id = res[0]['id']
            if (not controller_slice.tenant_id):
                try:
                        driver = OpenStackDriver().client_driver(caller=controller_slice.controller.admin_user,
                                                         tenant=controller_slice.controller.admin_tenant,
                                                         controller=controller_network.controller)
                        driver.shell.nova.quotas.update(tenant_id=controller_slice.slice.name, instances=int(controller_slice.slice.max_slivers))
                except:
                        logging.info('Could not update quota for %s'%controller_slice.slice.name)
                        raise Exception('Could not update quota for %s'%controller_slice.slice.name)

                controller_slice.tenant_id = tenant_id
                controller_slice.save()


    def delete_record(self, controller_slice):
        user = User.objects.get(id=controller_slice.slice.creator.id)
        driver = OpenStackDriver().admin_driver(controller=controller_slice.controller.name)
        client_driver = driver.client_driver(caller=user,
                                             tenant=controller_slice.slice.name,
                                             controller=controller_slice.controller.name)

        if controller_slice.router_id and controller_slice.subnet_id:
            client_driver.delete_router_interface(controller_slice.router_id, controller_slice.subnet_id)
        if controller_slice.subnet_id:
            client_driver.delete_subnet(controller_slice.subnet_id)
        if controller_slice.router_id:
            client_driver.delete_router(controller_slice.router_id)
        if controller_slice.network_id:
            client_driver.delete_network(controller_slice.network_id)
        if controller_slice.tenant_id:
            driver.delete_tenant(controller_slice.tenant_id)