from rest_framework.viewsets import ModelViewSet, ViewSet, ReadOnlyModelViewSet, GenericViewSet
from rest_framework.decorators import action
from rest_framework.response import Response
from django.contrib.contenttypes.models import ContentType

from .serializers import PreDeviceRoleSerializer, TopologyDummySerializer, PreTagSerializer
from django.conf import settings

from utilities.api import IsAuthenticatedOrLoginNotRequired

from dcim.models import  DeviceRole, Device, Cable
from extras.models import Tag, CustomField, CustomFieldValue

ignore_cable_type_raw = settings.PLUGINS_CONFIG["netbox_topology_views"]["ignore_cable_type"]
ignore_cable_type = ignore_cable_type_raw.split(",")

preselected_device_roles_raw = settings.PLUGINS_CONFIG["netbox_topology_views"]["preselected_device_roles"]
preselected_device_roles = preselected_device_roles_raw.split(",")

preselected_tags_raw = settings.PLUGINS_CONFIG["netbox_topology_views"]["preselected_tags"]
preselected_tags = preselected_tags_raw.split(",")


class PreSelectDeviceRolesViewSet(ReadOnlyModelViewSet):
    queryset = DeviceRole.objects.filter(name__in=preselected_device_roles)
    serializer_class = PreDeviceRoleSerializer

class PreSelectTagsViewSet(ReadOnlyModelViewSet):
    queryset = Tag.objects.filter(name__in=preselected_tags)
    serializer_class = PreTagSerializer

class SaveCoordsViewSet(GenericViewSet):
    queryset = Device.objects.all()
    serializer_class = TopologyDummySerializer

    @action(detail=False, methods=['post'])
    def save_coords(self, request):
        results = {}
        if settings.PLUGINS_CONFIG["netbox_topology_views"]["allow_coordinates_saving"]:
            try:
                 cfCoords = CustomField.objects.get(name='coordinates')
            except CustomField.DoesNotExist:
                results["status"] = "coords custom field not created"
                return Response(status=500)

            obj_type = ContentType.objects.get_for_model(Device)

            device_id = None
            x_coord = None
            y_coord = None
            if "node_id" in request.data:
                if request.data["node_id"]:
                    device_id = request.data["node_id"]
            if "x" in request.data:
                if request.data["x"]:
                    x_coord = request.data["x"]
            if "y" in request.data:
                if request.data["y"]:
                    y_coord = request.data["y"]

            actual_device= Device.objects.get(id=device_id)
            try:
                cfvCoords = CustomFieldValue.objects.get(obj_type=obj_type, obj_id=actual_device.pk, field__name='coordinates')
                cfvCoords.value = "%s;%s" % (x_coord,y_coord)
                cfvCoords.save()
                results["status"] = "coords set"
            except CustomFieldValue.DoesNotExist:
                cfvCoords = CustomFieldValue(field=cfCoords, obj_type=obj_type, obj_id=actual_device.id)
                cfvCoords.value = "%s;%s" % (x_coord,y_coord)
                cfvCoords.save()
                results["status"] = "coords set for first time"
            
            return Response(results)
        else:
            results["status"] = "not allowed to save coords"
            return Response(results, status=500)

class SearchViewSet(GenericViewSet):
    #_ignore_model_permissions = True
    #permission_classes = [IsAuthenticatedOrLoginNotRequired]

    queryset = Device.objects.all()
    serializer_class = TopologyDummySerializer

    def _filter(self, site, role, name, tags):
        filter_devices = Device.objects.all()
        if name is not None:
            filter_devices = filter_devices.filter(name__contains=name)
        if site is not None:
            filter_devices = filter_devices.filter(site__id__in=site)
        if role is not None:
            filter_devices = filter_devices.filter(device_role__id__in=role)
        if tags is not None:
            filter_devices = filter_devices.filter(tags__id__in=tags)
        return filter_devices


    @action(detail=False, methods=['post'])
    def search(self, request):
        name = None
        sites = None
        devicerole = None
        tags = None
        if "devicerole" in request.data:
            if request.data["devicerole"]:
                devicerole = request.data["devicerole"]
        if "sites" in request.data:
            if request.data["sites"]:
                sites = request.data["sites"]
        if "name" in request.data:
            if request.data["name"]:
                name = request.data["name"]
        if "tags" in request.data:
            if request.data["tags"]:
                tags = request.data["tags"]

        devices = self._filter(sites, devicerole, name, tags)

        nodes = []
        edges = []
        edge_ids = 0
        cable_ids = []
        for device in devices:
            cables = device.get_cables()
            for cable in cables:
                if cable.termination_a_type.name != "circuit termination" and cable.termination_b_type.name != "circuit termination":
                    if cable.id not in cable_ids:
                        if cable.termination_a_type.name not in ignore_cable_type and cable.termination_b_type.name not in ignore_cable_type:
                            cable_ids.append(cable.id)
                            edge_ids += 1
                            edge = {}
                            edge["id"] = edge_ids
                            edge["from"] = cable.termination_a.device.id
                            edge["to"] = cable.termination_b.device.id
                            edge["title"] = "Connection between <br> " + cable.termination_a.device.name + " [" + cable.termination_a.name +  "]<br>" + cable.termination_b.device.name + " [" + cable.termination_b.name + "]"
                            edges.append(edge)
                else:
                    pass
                    #circuittermination not supported for now
            node = {}
            node["id"] = device.id
            node["name"] = device.name
            node["label"] = device.name + " " + device.device_type.display_name
            node["shape"] = 'image'
            if device.device_role.slug in settings.PLUGINS_CONFIG["netbox_topology_views"]["device_img"]:
                node["image"] = '../../static/netbox_topology_views/img/'  + device.device_role.slug + ".png"
            else:
                node["image"] = "../../static/netbox_topology_views/img/role-unknown.png"

            for device_custom_field in device.custom_field_values.all():
                if device_custom_field.field.name == "coordinates":
                    cords =  device_custom_field.serialized_value.split(";")
                    node["x"] = int(cords[0])
                    node["y"] = int(cords[1])
                    node["physics"] = False
            
            nodes.append(node)

        results = {}
        results["nodes"] = nodes
        results["edges"] = edges

        return Response(results)