# -*- coding: utf-8 -*-
#

import random

from rest_framework import generics
from rest_framework.response import Response
from rest_framework_bulk import BulkModelViewSet
from rest_framework_bulk import ListBulkCreateUpdateDestroyAPIView
from rest_framework.pagination import LimitOffsetPagination
from django.shortcuts import get_object_or_404
from django.db.models import Q

from common.mixins import IDInFilterMixin
from common.utils import get_logger
from common.permissions import IsOrgAdmin, IsOrgAdminOrAppUser
from ..models import Asset, AdminUser, Node
from .. import serializers
from ..tasks import update_asset_hardware_info_manual, \
    test_asset_connectability_manual
from ..utils import LabelFilter


logger = get_logger(__file__)
__all__ = [
    'AssetViewSet', 'AssetListUpdateApi',
    'AssetRefreshHardwareApi', 'AssetAdminUserTestApi',
    'AssetGatewayApi'
]


class AssetViewSet(IDInFilterMixin, LabelFilter, BulkModelViewSet):
    """
    API endpoint that allows Asset to be viewed or edited.
    """
    filter_fields = ("hostname", "ip")
    search_fields = filter_fields
    ordering_fields = ("hostname", "ip", "port", "cpu_cores")
    queryset = Asset.objects.all()
    serializer_class = serializers.AssetSerializer
    pagination_class = LimitOffsetPagination
    permission_classes = (IsOrgAdminOrAppUser,)

    def filter_node(self):
        node_id = self.request.query_params.get("node_id")
        if not node_id:
            return

        node = get_object_or_404(Node, id=node_id)
        show_current_asset = self.request.query_params.get("show_current_asset") in ('1', 'true')

        if node.is_root():
            if show_current_asset:
                self.queryset = self.queryset.filter(
                    Q(nodes=node_id) | Q(nodes__isnull=True)
                )
            return
        if show_current_asset:
            self.queryset = self.queryset.filter(nodes=node)
        else:
            self.queryset = self.queryset.filter(
                nodes__key__regex='^{}(:[0-9]+)*$'.format(node.key),
            )

    def filter_admin_user_id(self):
        admin_user_id = self.request.query_params.get('admin_user_id')
        if admin_user_id:
            admin_user = get_object_or_404(AdminUser, id=admin_user_id)
            self.queryset = self.queryset.filter(admin_user=admin_user)

    def get_queryset(self):
        self.queryset = super().get_queryset()\
            .prefetch_related('labels', 'nodes')\
            .select_related('admin_user')
        self.filter_admin_user_id()
        self.filter_node()
        return self.queryset.distinct()


class AssetListUpdateApi(IDInFilterMixin, ListBulkCreateUpdateDestroyAPIView):
    """
    Asset bulk update api
    """
    queryset = Asset.objects.all()
    serializer_class = serializers.AssetSerializer
    permission_classes = (IsOrgAdmin,)


class AssetRefreshHardwareApi(generics.RetrieveAPIView):
    """
    Refresh asset hardware info
    """
    queryset = Asset.objects.all()
    serializer_class = serializers.AssetSerializer
    permission_classes = (IsOrgAdmin,)

    def retrieve(self, request, *args, **kwargs):
        asset_id = kwargs.get('pk')
        asset = get_object_or_404(Asset, pk=asset_id)
        task = update_asset_hardware_info_manual.delay(asset)
        return Response({"task": task.id})


class AssetAdminUserTestApi(generics.RetrieveAPIView):
    """
    Test asset admin user connectivity
    """
    queryset = Asset.objects.all()
    permission_classes = (IsOrgAdmin,)

    def retrieve(self, request, *args, **kwargs):
        asset_id = kwargs.get('pk')
        asset = get_object_or_404(Asset, pk=asset_id)
        task = test_asset_connectability_manual.delay(asset)
        return Response({"task": task.id})


class AssetGatewayApi(generics.RetrieveAPIView):
    queryset = Asset.objects.all()
    permission_classes = (IsOrgAdminOrAppUser,)

    def retrieve(self, request, *args, **kwargs):
        asset_id = kwargs.get('pk')
        asset = get_object_or_404(Asset, pk=asset_id)

        if asset.domain and \
                asset.domain.gateways.filter(protocol=asset.protocol).exists():
            gateway = random.choice(asset.domain.gateways.filter(protocol=asset.protocol))
            serializer = serializers.GatewayWithAuthSerializer(instance=gateway)
            return Response(serializer.data)
        else:
            return Response({"msg": "Not have gateway"}, status=404)