from django_filters.rest_framework import DjangoFilterBackend
from rest_framework.decorators import action
from rest_framework.permissions import IsAuthenticated, AllowAny
from rest_framework.response import Response as Http_Response
from rest_framework.viewsets import ModelViewSet
from api.mixins import OwnerFieldMixin, DestroyToInvisibleMixin
from api.permissions import IsSuperOrReadOnly, IsAuthOrReadOnly, IsStaffOrReadOnly
#from blog.models import Post, Comment, Reply, Category, Tag, PostTag
from blog.models import Post, Category, Tag, PostTag
#from blog.serializers import PostSerializer, CommentSerializer, ReplySerializer, CategorySerializer, TagSerializer, PostTagSerializer
from blog.serializers import PostSerializer, CategorySerializer, TagSerializer, PostTagSerializer

############################################################
#REST API for Post
############################################################
class PostViewSet(DestroyToInvisibleMixin, OwnerFieldMixin, ModelViewSet):
    #Everyone can read, just staff user can modificate
    permission_classes = (IsStaffOrReadOnly,)
    queryset = Post.objects.filter(visible=True)
    serializer_class = PostSerializer
    #Enable filter by code
    filter_backends = (DjangoFilterBackend,)
    filterset_fields = ('slug','category','tags__tag')

    @action(detail=True, methods=['post'], permission_classes=[AllowAny])
    def increase_rating(self, request, pk=None):
        post = self.get_object()
        data = {'rating': post.rating + 1}
        serializer = self.get_serializer(post, data=data, partial=True)
        serializer.is_valid(raise_exception=True)
        self.perform_update(serializer)
        return Http_Response(serializer.data)

"""
############################################################
#REST API for Comment
############################################################
class CommentViewSet(NestedViewSetMixin, ModelViewSet):
    permission_classes = (IsAuthOrReadOnly, )
    queryset = Comment.objects.all()
    serializer_class = CommentSerializer
    #Enable filter by comment and username
    filter_backends = (DjangoFilterBackend,)
    filterset_fields = ('post', 'username')

    def create(self, request, *args, **kwargs):
        #Set the username and email by default if the user is authenticated
        user = request.user
        if user.is_authenticated:
            request.data['username'] = user.username
            request.data['email'] = user.email
        return super(CommentViewSet, self).create(request, *args, **kwargs)


############################################################
#REST API for Reply
############################################################
class ReplyViewSet(NestedViewSetMixin, ModelViewSet):
    permission_classes = (IsAuthOrReadOnly, )
    queryset = Reply.objects.all()
    serializer_class = ReplySerializer
    #Enable filter by comment and username
    filter_backends = (DjangoFilterBackend,)
    filterset_fields = ('comment', 'username')

    def create(self, request, *args, **kwargs):
        #Set the username and email by default if the user is authenticated
        user = request.user
        if user.is_authenticated:
            request.data['username'] = user.username
            request.data['email'] = user.email
        return super(ReplyViewSet, self).create(request, *args, **kwargs)
"""

############################################################
#REST API for Category
############################################################
class CategoryViewSet(DestroyToInvisibleMixin, ModelViewSet):
    permission_classes = (IsStaffOrReadOnly, )
    queryset = Category.objects.filter(visible=True)
    serializer_class = CategorySerializer
    #Enable filter by name
    filter_backends = (DjangoFilterBackend,)
    filterset_fields = ('name', )

############################################################
#REST API for Tag
############################################################
class TagViewSet(ModelViewSet):
    permission_classes = (IsStaffOrReadOnly, )
    queryset = Tag.objects.all()
    serializer_class = TagSerializer
    #Enable filter by name
    filter_backends = (DjangoFilterBackend,)
    filterset_fields = ('name', )

############################################################
#REST API for PostTag
############################################################
class PostTagViewSet(ModelViewSet):
    permission_classes = (IsStaffOrReadOnly, )
    queryset = PostTag.objects.all()
    serializer_class = PostTagSerializer
    #Enable filter by name
    filter_backends = (DjangoFilterBackend,)
    filterset_fields = ('post', 'post')