from rest_framework import generics
from rest_framework import serializers
from rest_framework.decorators import action
from rest_framework.response import Response

from assets.const import AllTypes
from assets.models import Platform, Node, Asset
from assets.serializers import PlatformSerializer
from common.api import JMSModelViewSet
from common.permissions import IsValidUser
from common.serializers import GroupedChoiceSerializer

__all__ = ['AssetPlatformViewSet', 'PlatformAutomationMethodsApi']


class AssetPlatformViewSet(JMSModelViewSet):
    queryset = Platform.objects.all()
    serializer_classes = {
        'default': PlatformSerializer,
        'categories': GroupedChoiceSerializer
    }
    filterset_fields = ['name', 'category', 'type']
    search_fields = ['name']
    rbac_perms = {
        'categories': 'assets.view_platform',
        'type_constraints': 'assets.view_platform',
        'ops_methods': 'assets.view_platform',
        'filter_nodes_assets': 'assets.view_platform'
    }

    def get_queryset(self):
        queryset = super().get_queryset()
        queryset = queryset.filter(type__in=AllTypes.get_types_values())
        return queryset

    def get_object(self):
        pk = self.kwargs.get('pk', '')
        if pk.isnumeric():
            return super().get_object()
        return self.get_queryset().get(name=pk)

    def check_object_permissions(self, request, obj):
        if request.method.lower() in ['delete', 'put', 'patch'] and obj.internal:
            self.permission_denied(
                request, message={"detail": "Internal platform"}
            )
        return super().check_object_permissions(request, obj)

    @action(methods=['post'], detail=False, url_path='filter-nodes-assets')
    def filter_nodes_assets(self, request, *args, **kwargs):
        node_ids = request.data.get('node_ids', [])
        asset_ids = request.data.get('asset_ids', [])
        nodes = Node.objects.filter(id__in=node_ids)
        node_asset_ids = Node.get_nodes_all_assets(*nodes).values_list('id', flat=True)
        direct_asset_ids = Asset.objects.filter(id__in=asset_ids).values_list('id', flat=True)
        platform_ids = Asset.objects.filter(
            id__in=set(list(direct_asset_ids) + list(node_asset_ids))
        ).values_list('platform_id', flat=True)
        platforms = Platform.objects.filter(id__in=platform_ids)
        serializer = self.get_serializer(platforms, many=True)
        return Response(serializer.data)


class PlatformAutomationMethodsApi(generics.ListAPIView):
    permission_classes = (IsValidUser,)

    @staticmethod
    def automation_methods():
        return AllTypes.get_automation_methods()

    def generate_serializer_fields(self):
        data = self.automation_methods()
        fields = {
            i['id']: i['params_serializer'](label=i['name'])
            if i['params_serializer'] else None
            for i in data
        }
        return fields

    def get_serializer_class(self):
        fields = self.generate_serializer_fields()
        serializer_name = 'AutomationMethodsSerializer'
        return type(serializer_name, (serializers.Serializer,), fields)

    def list(self, request, *args, **kwargs):
        data = self.generate_serializer_fields()
        serializer = self.get_serializer(data)
        return Response(serializer.data)