from django.shortcuts import get_object_or_404

from rest_framework import mixins, status, viewsets
from rest_framework.decorators import action
from rest_framework.permissions import AllowAny
from rest_framework.response import Response

from profiles.models import RadioProfile, Rating, SongRequest
from radio.models import Song
from ..permissions import IsAdminOwnerOrReadOnly
from ..serializers.profiles import (BasicProfileSerializer,
                                    FullProfileSerializer,
                                    FavoriteSongSerializer,
                                    HistorySerializer)
from ..serializers.radio import BasicSongRetrieveSerializer


class ProfileViewSet(viewsets.ModelViewSet):
    permission_classes = [IsAdminOwnerOrReadOnly]
    queryset = RadioProfile.objects.all()
    serializer_class = BasicProfileSerializer

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.is_owner = False

    def get_serializer_class(self):
        '''
        Choose a different serializer based on if the requesting user is an
        admin or is the same person as the profile requested.
        '''
        if self.request.user.is_staff or self.is_owner:
            return FullProfileSerializer
        return BasicProfileSerializer

    def get_object(self):
        '''
        Grab the object as normal, but let us know if the requesting user is
        the owner.
        '''
        obj = get_object_or_404(self.get_queryset(), **self.kwargs)
        if self.request.user.pk == obj.user.pk:
            self.is_owner = True
        else:
            self.is_owner = False
        self.check_object_permissions(self.request, obj)
        return obj

    @action(detail=True, permission_classes=[AllowAny])
    def favorites(self, request, pk=None):
        profile = self.get_object()
        favorites = profile.favorites.all().order_by('sorted_title')

        page = self.paginate_queryset(favorites)
        if page is not None:
            serializer = BasicSongRetrieveSerializer(page, many=True)
            return self.get_paginated_response(serializer.data)

        serializer = BasicSongRetrieveSerializer(favorites, many=True)
        return Response(serializer.data)

    def _favorite_change(self, request, remove=False):
        profile = self.get_object()
        serializer = FavoriteSongSerializer(data=request.data)
        if serializer.is_valid():
            song = Song.objects.get(pk=serializer.data['song'])
            if remove:
                profile.favorites.remove(song)
            else:
                profile.favorites.add(song)
            profile.save()
            message = 'Song {} favorites.'.format(('added to',
                                                   'removed from')[remove])
            return Response({'detail': message})
        return Response(serializer.errors,
                        status=status.HTTP_400_BAD_REQUEST)

    @action(methods=['post'],
            detail=True,
            permission_classes=[IsAdminOwnerOrReadOnly])
    def favorite_add(self, request, pk=None):
        return self._favorite_change(request)

    @action(methods=['post'],
            detail=True,
            permission_classes=[IsAdminOwnerOrReadOnly])
    def favorite_remove(self, request, pk=None):
        return self._favorite_change(request, remove=True)


class HistoryViewSet(mixins.ListModelMixin, viewsets.GenericViewSet):
    permission_classes = [AllowAny]
    queryset = SongRequest.objects.all()
    serializer_class = HistorySerializer