from django.shortcuts import get_object_or_404
from django_rq.queues import get_connection
from rest_framework import status
from rest_framework.decorators import action
from rest_framework.exceptions import PermissionDenied
from rest_framework.generics import RetrieveUpdateDestroyAPIView
from rest_framework.renderers import JSONRenderer
from rest_framework.response import Response
from rest_framework.routers import APIRootView
from rest_framework.viewsets import ModelViewSet, ReadOnlyModelViewSet
from rq import Worker

from core.models import Job, ObjectType
from extras import filtersets
from extras.models import *
from extras.scripts import run_script
from netbox.api.authentication import IsAuthenticatedOrLoginNotRequired
from netbox.api.features import SyncedDataMixin
from netbox.api.metadata import ContentTypeMetadata
from netbox.api.renderers import TextRenderer
from netbox.api.viewsets import NetBoxModelViewSet
from utilities.exceptions import RQWorkerNotRunningException
from utilities.utils import copy_safe_request
from . import serializers
from .mixins import ConfigTemplateRenderMixin


class ExtrasRootView(APIRootView):
    """
    Extras API root view
    """
    def get_view_name(self):
        return 'Extras'


#
# EventRules
#

class EventRuleViewSet(NetBoxModelViewSet):
    metadata_class = ContentTypeMetadata
    queryset = EventRule.objects.all()
    serializer_class = serializers.EventRuleSerializer
    filterset_class = filtersets.EventRuleFilterSet


#
# Webhooks
#

class WebhookViewSet(NetBoxModelViewSet):
    metadata_class = ContentTypeMetadata
    queryset = Webhook.objects.all()
    serializer_class = serializers.WebhookSerializer
    filterset_class = filtersets.WebhookFilterSet


#
# Custom fields
#

class CustomFieldViewSet(NetBoxModelViewSet):
    metadata_class = ContentTypeMetadata
    queryset = CustomField.objects.select_related('choice_set')
    serializer_class = serializers.CustomFieldSerializer
    filterset_class = filtersets.CustomFieldFilterSet


class CustomFieldChoiceSetViewSet(NetBoxModelViewSet):
    queryset = CustomFieldChoiceSet.objects.all()
    serializer_class = serializers.CustomFieldChoiceSetSerializer
    filterset_class = filtersets.CustomFieldChoiceSetFilterSet

    @action(detail=True)
    def choices(self, request, pk):
        """
        Provides an endpoint to iterate through each choice in a set.
        """
        choiceset = get_object_or_404(self.queryset, pk=pk)
        choices = choiceset.choices

        # Enable filtering
        if q := request.GET.get('q'):
            q = q.lower()
            choices = [c for c in choices if q in c[0].lower() or q in c[1].lower()]

        # Paginate data
        if page := self.paginate_queryset(choices):
            data = [
                {'id': c[0], 'display': c[1]} for c in page
            ]
        else:
            data = []

        return self.get_paginated_response(data)


#
# Custom links
#

class CustomLinkViewSet(NetBoxModelViewSet):
    metadata_class = ContentTypeMetadata
    queryset = CustomLink.objects.all()
    serializer_class = serializers.CustomLinkSerializer
    filterset_class = filtersets.CustomLinkFilterSet


#
# Export templates
#

class ExportTemplateViewSet(SyncedDataMixin, NetBoxModelViewSet):
    metadata_class = ContentTypeMetadata
    queryset = ExportTemplate.objects.all()
    serializer_class = serializers.ExportTemplateSerializer
    filterset_class = filtersets.ExportTemplateFilterSet


#
# Saved filters
#

class SavedFilterViewSet(NetBoxModelViewSet):
    metadata_class = ContentTypeMetadata
    queryset = SavedFilter.objects.all()
    serializer_class = serializers.SavedFilterSerializer
    filterset_class = filtersets.SavedFilterFilterSet


#
# Bookmarks
#

class BookmarkViewSet(NetBoxModelViewSet):
    metadata_class = ContentTypeMetadata
    queryset = Bookmark.objects.all()
    serializer_class = serializers.BookmarkSerializer
    filterset_class = filtersets.BookmarkFilterSet


#
# Tags
#

class TagViewSet(NetBoxModelViewSet):
    queryset = Tag.objects.all()
    serializer_class = serializers.TagSerializer
    filterset_class = filtersets.TagFilterSet


#
# Image attachments
#

class ImageAttachmentViewSet(NetBoxModelViewSet):
    metadata_class = ContentTypeMetadata
    queryset = ImageAttachment.objects.all()
    serializer_class = serializers.ImageAttachmentSerializer
    filterset_class = filtersets.ImageAttachmentFilterSet


#
# Journal entries
#

class JournalEntryViewSet(NetBoxModelViewSet):
    metadata_class = ContentTypeMetadata
    queryset = JournalEntry.objects.all()
    serializer_class = serializers.JournalEntrySerializer
    filterset_class = filtersets.JournalEntryFilterSet


#
# Config contexts
#

class ConfigContextViewSet(SyncedDataMixin, NetBoxModelViewSet):
    queryset = ConfigContext.objects.all()
    serializer_class = serializers.ConfigContextSerializer
    filterset_class = filtersets.ConfigContextFilterSet


#
# Config templates
#

class ConfigTemplateViewSet(SyncedDataMixin, ConfigTemplateRenderMixin, NetBoxModelViewSet):
    queryset = ConfigTemplate.objects.all()
    serializer_class = serializers.ConfigTemplateSerializer
    filterset_class = filtersets.ConfigTemplateFilterSet

    @action(detail=True, methods=['post'], renderer_classes=[JSONRenderer, TextRenderer])
    def render(self, request, pk):
        """
        Render a ConfigTemplate using the context data provided (if any). If the client requests "text/plain" data,
        return the raw rendered content, rather than serialized JSON.
        """
        configtemplate = self.get_object()
        context = request.data

        return self.render_configtemplate(request, configtemplate, context)


#
# Scripts
#

class ScriptViewSet(ModelViewSet):
    permission_classes = [IsAuthenticatedOrLoginNotRequired]
    queryset = Script.objects.prefetch_related('jobs')
    serializer_class = serializers.ScriptSerializer
    filterset_class = filtersets.ScriptFilterSet

    _ignore_model_permissions = True
    lookup_value_regex = '[^/]+'  # Allow dots

    def retrieve(self, request, pk):
        script = get_object_or_404(self.queryset, pk=pk)
        serializer = serializers.ScriptDetailSerializer(script, context={'request': request})

        return Response(serializer.data)

    def post(self, request, pk):
        """
        Run a Script identified by the id and return the pending Job as the result
        """

        if not request.user.has_perm('extras.run_script'):
            raise PermissionDenied("This user does not have permission to run scripts.")

        script = get_object_or_404(self.queryset, pk=pk)
        input_serializer = serializers.ScriptInputSerializer(
            data=request.data,
            context={'script': script}
        )

        # Check that at least one RQ worker is running
        if not Worker.count(get_connection('default')):
            raise RQWorkerNotRunningException()

        if input_serializer.is_valid():
            script.result = Job.enqueue(
                run_script,
                instance=script.module,
                name=script.python_class.class_name,
                user=request.user,
                data=input_serializer.data['data'],
                request=copy_safe_request(request),
                commit=input_serializer.data['commit'],
                job_timeout=script.python_class.job_timeout,
                schedule_at=input_serializer.validated_data.get('schedule_at'),
                interval=input_serializer.validated_data.get('interval')
            )
            serializer = serializers.ScriptDetailSerializer(script, context={'request': request})

            return Response(serializer.data)

        return Response(input_serializer.errors, status=status.HTTP_400_BAD_REQUEST)


#
# Change logging
#

class ObjectChangeViewSet(ReadOnlyModelViewSet):
    """
    Retrieve a list of recent changes.
    """
    metadata_class = ContentTypeMetadata
    queryset = ObjectChange.objects.valid_models()
    serializer_class = serializers.ObjectChangeSerializer
    filterset_class = filtersets.ObjectChangeFilterSet


#
# Object types
#

class ObjectTypeViewSet(ReadOnlyModelViewSet):
    """
    Read-only list of ObjectTypes.
    """
    permission_classes = [IsAuthenticatedOrLoginNotRequired]
    queryset = ObjectType.objects.order_by('app_label', 'model')
    serializer_class = serializers.ObjectTypeSerializer
    filterset_class = filtersets.ObjectTypeFilterSet


#
# User dashboard
#

class DashboardView(RetrieveUpdateDestroyAPIView):
    queryset = Dashboard.objects.all()
    serializer_class = serializers.DashboardSerializer

    def get_object(self):
        return Dashboard.objects.filter(user=self.request.user).first()