import os
import pdb
import sys
import tempfile
sys.path.append("/opt/tosca")
from translator.toscalib.tosca_template import ToscaTemplate
import pdb

from core.models import Slice,User,Network,NetworkTemplate,NetworkSlice,Service,Tenant

from xosresource import XOSResource

class XOSNetwork(XOSResource):
    provides = ["tosca.nodes.network.Network", "tosca.nodes.network.Network.XOS"]
    xos_model = Network
    copyin_props = ["ports", "labels"]

    def get_xos_args(self):
        args = super(XOSNetwork, self).get_xos_args()

        args["autoconnect"] = False

        slice_name = self.get_requirement("tosca.relationships.MemberOfSlice")
        if slice_name:
            args["owner"] = self.get_xos_object(Slice, name=slice_name)

        net_template_name = self.get_requirement("tosca.relationships.UsesNetworkTemplate")
        if net_template_name:
            args["template"] = self.get_xos_object(NetworkTemplate, name=net_template_name)

        if self.nodetemplate.type == "tosca.nodes.network.Network.XOS":
            # copy simple string properties from the template into the arguments
            for prop in ["ports", "labels", "permit_all_slices"]:
                v = self.get_property(prop)
                if v:
                    args[prop] = v
        else:
            # tosca.nodes.network.Network is not as rich as an XOS network. So
            # we have to manually fill in some defaults.
            args["permit_all_slices"] = True

        cidr = self.get_property_default("cidr", None)
        if cidr:
            args["subnet"] = cidr

        return args

    def postprocess(self, obj):
        for sliceName in self.get_requirements("tosca.relationships.ConnectsToSlice"):
            slice = self.get_xos_object(Slice, name=sliceName)
            netSlices = NetworkSlice.objects.filter(network=obj, slice = slice)
            if not netSlices:
                self.info("Attached Network %s to Slice %s" % (obj, slice))
                ns = NetworkSlice(network = obj, slice=slice)
                ns.save()

        # this is really for vRouter
        for provider_service_name in self.get_requirements("tosca.relationships.TenantOfService"):
            provider_service = self.get_xos_object(Service, name=provider_service_name)

            existing_tenancy = Tenant.objects.filter(provider_service = provider_service, subscriber_network = obj)
            if existing_tenancy:
                self.info("Tenancy relationship from %s to %s already exists" % (str(obj), str(provider_service)))
            else:
                from services.vrouter.models import VROUTER_KIND, VRouterService
                if provider_service.kind == VROUTER_KIND:
                    tenancy = VRouterService.objects.get(id=provider_service.id).get_tenant(address_pool_name="addresses_"+obj.name, subscriber_network=obj)
                    tenancy.save()
                    obj.subnet = tenancy.cidr
                else:
                    raise Exception("The only network tenancy relationships that are allowed are to vRouter services")

                self.info("Created Tenancy relationship from %s to %s" % (str(obj), str(provider_service)))

#        v = self.get_property("permitted_slices")
#        if v:
#            for slicename in v.split(","):
#                slice = self.get_xos_object(Slice, name = slicename.strip())
#
#                if not obj.permitted_slices.filter(id = slice.id).exists():
#                    obj.permitted_slices.add(slice)

    def create(self):
        nodetemplate = self.nodetemplate

        xos_args = self.get_xos_args()

        if not xos_args.get("owner", None):
            raise Exception("Must specify slice when creating network")
        if not xos_args.get("template", None):
            raise Exception("Must specify network template when creating network")

        # XXX TODO: investigate using transaction.atomic instead of setting
        #   no_sync and no_policy

        network = Network(**xos_args)
        network.caller = self.user
        network.no_sync = True        # postprocess might set the cidr
        network.no_policy = True
        network.save()

        self.postprocess(network)

        network.no_sync = False
        network.no_policy = False
        network.save()

        self.info("Created Network '%s' owned by Slice '%s'" % (str(network), str(network.owner)))

    def delete(self, obj):
        super(XOSNetwork, self).delete(obj)