import hashlib
import os
import socket
import sys
import base64
import time
import re
import json
from collections import OrderedDict
from django.db.models import F, Q
from xos.config import Config
from synchronizers.base.ansible import run_template
from synchronizers.base.syncstep import SyncStep
from synchronizers.base.ansible import run_template_ssh
from synchronizers.base.SyncInstanceUsingAnsible import SyncInstanceUsingAnsible
from core.models import Service, Slice, Controller, ControllerSlice, ControllerUser, Node, TenantAttribute, Tag
from services.onos.models import ONOSService, ONOSApp
from xos.logger import Logger, logging
from services.vrouter.models import VRouterService

# hpclibrary will be in steps/..
parentdir = os.path.join(os.path.dirname(__file__),"..")
sys.path.insert(0,parentdir)

logger = Logger(level=logging.INFO)

class SyncONOSApp(SyncInstanceUsingAnsible):
    provides=[ONOSApp]
    observes=ONOSApp
    requested_interval=0
    template_name = "sync_onosapp.yaml"
    service_key_name = "/opt/xos/synchronizers/onos/onos_key"

    def __init__(self, *args, **kwargs):
        super(SyncONOSApp, self).__init__(*args, **kwargs)

    def fetch_pending(self, deleted):
        if (not deleted):
            objs = ONOSApp.get_tenant_objects().filter(Q(enacted__lt=F('updated')) | Q(enacted=None),Q(lazy_blocked=False))
        else:
            objs = ONOSApp.get_deleted_tenant_objects()

        return objs

    def get_instance(self, o):
        # We assume the ONOS service owns a slice, so pick one of the instances
        # inside that slice to sync to.

        serv = self.get_onos_service(o)

        if serv.no_container:
            raise Exception("get_instance() was called on a service that was marked no_container")

        if serv.slices.exists():
            slice = serv.slices.all()[0]
            if slice.instances.exists():
                return slice.instances.all()[0]

        return None

    def get_onos_service(self, o):
        if not o.provider_service:
            return None

        onoses = ONOSService.get_service_objects().filter(id=o.provider_service.id)
        if not onoses:
            return None

        return onoses[0]

    def is_no_container(self, o):
        return self.get_onos_service(o).no_container

    def skip_ansible_fields(self, o):
        return self.is_no_container(o)

    def get_files_dir(self, o):
        if not hasattr(Config(), "observer_steps_dir"):
            # make steps_dir mandatory; there's no valid reason for it to not
            # be defined.
            raise Exception("observer_steps_dir is not defined in config file")

        step_dir = Config().observer_steps_dir

        return os.path.join(step_dir, "..", "files", str(self.get_onos_service(o).id), o.name)

    def get_cluster_configuration(self, o):
        instance = self.get_instance(o)
        if not instance:
           raise "No instance for ONOS App"
        node_ips = [socket.gethostbyname(instance.node.name)]

        ipPrefix = ".".join(node_ips[0].split(".")[:3]) + ".*"
        result = '{ "nodes": ['
        result = result + ",".join(['{ "ip": "%s"}' % ip for ip in node_ips])
        result = result + '], "ipPrefix": "%s"}' % ipPrefix
        return result

    def get_dynamic_parameter_value(self, o, param):
        instance = self.get_instance(o)
        if not instance:
           raise "No instance for ONOS App"
        if param == 'rabbit_host':
            return instance.controller.rabbit_host
        if param == 'rabbit_user':
            return instance.controller.rabbit_user
        if param == 'rabbit_password':
            return instance.controller.rabbit_password
        if param == 'keystone_tenant_id':
            cslice = ControllerSlice.objects.get(slice=instance.slice)
            if not cslice:
                raise Exception("Controller slice object for %s does not exist" % instance.slice.name)
            return cslice.tenant_id
        if param == 'keystone_user_id':
            cuser = ControllerUser.objects.get(user=instance.creator)
            if not cuser:
                raise Exception("Controller user object for %s does not exist" % instance.creator)
            return cuser.kuser_id


    def node_tag_default(self, o, node, tagname, default):
        tags = Tag.select_by_content_object(node).filter(name=tagname)
        if tags:
            value = tags[0].value
        else:
            value = default
            logger.info("node %s: saving default value %s for tag %s" % (node.name, value, tagname))
            service = self.get_onos_service(o)
            tag = Tag(service=service, content_object=node, name=tagname, value=value)
            tag.save()
        return value

    # Scan attrs for attribute name
    # If it's not present, save it as a TenantAttribute
    def attribute_default(self, tenant, attrs, name, default):
        if name in attrs:
            value = attrs[name]
        else:
            value = default
            logger.info("saving default value %s for attribute %s" % (value, name))
            ta = TenantAttribute(tenant=tenant, name=name, value=value)
            ta.save()
        return value

    # This function currently assumes a single Deployment and Site
    def get_vtn_config(self, o, attrs):

        # The "attrs" argument contains a list of all service and tenant attributes
        # If an attribute is present, use it in the configuration
        # Otherwise save the attriute with a reasonable (for a CORD devel pod) default value
        # The admin will see all possible configuration values and the assigned defaults
        privateGatewayMac = self.attribute_default(o, attrs, "privateGatewayMac", "00:00:00:00:00:01")
        localManagementIp = self.attribute_default(o, attrs, "localManagementIp", "172.27.0.1/24")
        ovsdbPort = self.attribute_default(o, attrs, "ovsdbPort", "6641")
        sshPort = self.attribute_default(o, attrs, "sshPort", "22")
        sshUser = self.attribute_default(o, attrs, "sshUser", "root")
        sshKeyFile = self.attribute_default(o, attrs, "sshKeyFile", "/root/node_key")

        # OpenStack endpoints and credentials
        keystone_server = "http://keystone:5000/v2.0/"
        user_name = "admin"
        password = "ADMIN_PASS"
        controllers = Controller.objects.all()
        if controllers:
            controller = controllers[0]
            keystone_server = controller.auth_url
            user_name = controller.admin_user
            tenant_name = controller.admin_tenant
            password = controller.admin_password

        data = {
            "apps" : {
                "org.onosproject.cordvtn" : {
                    "cordvtn" : {
                        "privateGatewayMac" : privateGatewayMac,
                        "localManagementIp": localManagementIp,
                        "ovsdbPort": ovsdbPort,
                        "ssh": {
                            "sshPort": sshPort,
                            "sshUser": sshUser,
                            "sshKeyFile": sshKeyFile
                        },
                        "openstack": {
                            "endpoint": keystone_server,
                            "tenant": tenant_name,
                            "user": user_name,
                            "password": password
                        },
                        "publicGateways": [],
                        "nodes" : []
                    }
                }
            }
        }

        # Generate apps->org.onosproject.cordvtn->cordvtn->nodes

        # We need to generate a CIDR address for the physical node's
        # address on the management network
        mgmtSubnetBits = self.attribute_default(o, attrs, "mgmtSubnetBits", "24")

        nodes = Node.objects.all()
        for node in nodes:
            nodeip = socket.gethostbyname(node.name)

            try:
                bridgeId = self.node_tag_default(o, node, "bridgeId", "of:0000000000000001")
                dataPlaneIntf = self.node_tag_default(o, node, "dataPlaneIntf", "veth1")
                # This should be generated from the AddressPool if not present
                dataPlaneIp = self.node_tag_default(o, node, "dataPlaneIp", "192.168.199.1/24")
            except:
                logger.error("not adding node %s to the VTN configuration" % node.name)
                continue

            node_dict = {
                "hostname": node.name,
                "hostManagementIp": "%s/%s" % (nodeip, mgmtSubnetBits),
                "bridgeId": bridgeId,
                "dataPlaneIntf": dataPlaneIntf,
                "dataPlaneIp": dataPlaneIp
            }
            data["apps"]["org.onosproject.cordvtn"]["cordvtn"]["nodes"].append(node_dict)

        # Generate apps->org.onosproject.cordvtn->cordvtn->publicGateways
        # Pull the gateway information from vRouter
        vrouters = VRouterService.get_service_objects().all()
        if vrouters:
            for gateway in vrouters[0].get_gateways():
                gatewayIp = gateway['gateway_ip'].split('/',1)[0]
                gatewayMac = gateway['gateway_mac']
                gateway_dict = {
                    "gatewayIp": gatewayIp,
                    "gatewayMac": gatewayMac
                }
                data["apps"]["org.onosproject.cordvtn"]["cordvtn"]["publicGateways"].append(gateway_dict)

        return json.dumps(data, indent=4, sort_keys=True)

    def write_configs(self, o):
        o.config_fns = []
        o.rest_configs = []
        o.component_configs = []
        o.files_dir = self.get_files_dir(o)

        if not os.path.exists(o.files_dir):
            os.makedirs(o.files_dir)

        # Combine the service attributes with the tenant attributes. Tenant
        # attribute can override service attributes.
        attrs = o.provider_service.serviceattribute_dict
        attrs.update(o.tenantattribute_dict)

        ordered_attrs = attrs.keys()

        onos = self.get_onos_service(o)
        if onos.node_key:
            file(os.path.join(o.files_dir, "node_key"),"w").write(onos.node_key)
            o.node_key_fn="node_key"
        else:
            o.node_key_fn=None

        o.early_rest_configs=[]
        if ("cordvtn" in o.dependencies) and (not self.is_no_container(o)):
            # For VTN, since it's running in a docker host container, we need
            # to make sure it configures the cluster using the right ip addresses.
            # NOTE: rest_onos/v1/cluster/configuration/ will reboot the cluster and
            #   must go first.
            name="rest_onos/v1/cluster/configuration/"
            value= self.get_cluster_configuration(o)
            fn = name[5:].replace("/","_")
            endpoint = name[5:]
            file(os.path.join(o.files_dir, fn),"w").write(" " +value)
            o.early_rest_configs.append( {"endpoint": endpoint, "fn": fn} )

        # Generate config files and save them to the appropriate tenant attributes
        autogen = []
        for key, value in attrs.iteritems():
            if key == "autogenerate" and value:
                autogen.append(value)
        for label in autogen:
            config = None
            value = None
            if label == "vtn-network-cfg":
            # Generate the VTN config file... where should this live?
                config = "rest_onos/v1/network/configuration/"
                value = self.get_vtn_config(o, attrs)
            if config:
                tas = TenantAttribute.objects.filter(tenant=o, name=config)
                if tas:
                    ta = tas[0]
                    if ta.value != value:
                        logger.info("updating %s with autogenerated config" % config)
                        ta.value = value
                        ta.save()
                        attrs[config] = value
                else:
                    logger.info("saving autogenerated config %s" % config)
                    ta = TenantAttribute(tenant=o, name=config, value=value)
                    ta.save()
                    attrs[config] = value

        for name in attrs.keys():
            value = attrs[name]
            if name.startswith("config_"):
                fn = name[7:] # .replace("_json",".json")
                o.config_fns.append(fn)
                file(os.path.join(o.files_dir, fn),"w").write(value)
            if name.startswith("rest_"):
                fn = name[5:].replace("/","_")
                endpoint = name[5:]
                # Ansible goes out of it's way to make our life difficult. If
                # 'lookup' sees a file that it thinks contains json, then it'll
                # insist on parsing and return a json object. We just want
                # a string, so prepend a space and then strip the space off
                # later.
                file(os.path.join(o.files_dir, fn),"w").write(" " +value)
                o.rest_configs.append( {"endpoint": endpoint, "fn": fn} )
            if name.startswith("component_config"):
                components = json.loads(value,object_pairs_hook=OrderedDict)
                for component in components.keys():
                    config = components[component]
                    for key in config.keys():
                         config_val = config[key]
                         found = re.findall('<(.+?)>',config_val)
                         for x in found:
                            #Get value corresponding to that string
                            val = self.get_dynamic_parameter_value(o, x)
                            if val:
	                       config_val = re.sub('<'+x+'>', val, config_val)
                            #TODO: else raise an exception?
	                 o.component_configs.append( {"component": component, "config_params": "'{\""+key+"\":\""+config_val+"\"}'"} )

    def prepare_record(self, o):
        self.write_configs(o)

    def get_extra_attributes_common(self, o):
        fields = {}

        # These are attributes that are not dependent on Instance. For example,
        # REST API stuff.

        onos = self.get_onos_service(o)

        fields["files_dir"] = o.files_dir
        fields["appname"] = o.name
        fields["rest_configs"] = o.rest_configs
        fields["rest_hostname"] = onos.rest_hostname
        fields["rest_port"] = onos.rest_port

        if o.dependencies:
            fields["dependencies"] = [x.strip() for x in o.dependencies.split(",")]
        else:
            fields["dependencies"] = []

        return fields

    def get_extra_attributes_full(self, o):
        instance = self.get_instance(o)

        fields = self.get_extra_attributes_common(o)

        fields["config_fns"] = o.config_fns
        fields["early_rest_configs"] = o.early_rest_configs
        fields["component_configs"] = o.component_configs
        fields["node_key_fn"] = o.node_key_fn

        if o.install_dependencies:
            fields["install_dependencies"] = [x.strip() for x in o.install_dependencies.split(",")]
        else:
            fields["install_dependencies"] = []

        if (instance.isolation=="container"):
            fields["ONOS_container"] = "%s-%s" % (instance.slice.name, str(instance.id))
        else:
            fields["ONOS_container"] = "ONOS"
        return fields

    def get_extra_attributes(self, o):
        if self.is_no_container(o):
            return self.get_extra_attributes_common(o)
        else:
            return self.get_extra_attributes_full(o)

    def sync_fields(self, o, fields):
        # the super causes the playbook to be run
        super(SyncONOSApp, self).sync_fields(o, fields)

    def run_playbook(self, o, fields):
        if self.is_no_container(o):
            # There is no machine to SSH to, so use the synchronizer's
            # run_template method directly.
            run_template("sync_onosapp_nocontainer.yaml", fields)
        else:
            super(SyncONOSApp, self).run_playbook(o, fields)

    def delete_record(self, m):
        pass