from rest_framework import viewsets, permissions, generics, mixins, status
#from rest_framework.authentication import TokenAuthentication
from rest_framework.response import Response
from .models import User
from .serializers import (
    CreateUserSerializer,
    UserSerializer,
    LoginUserSerializer,
    UpdateUserSerializer,
)
from knox.models import AuthToken


class RegistrationAPI(generics.GenericAPIView):
    serializer_class = CreateUserSerializer

    def post(self, request, *args, **kwargs):
        if len(request.data["email"]) < 6 or len(request.data["password"]) < 4:
            body = {"message": "short field"}
            return Response(body, status=status.HTTP_400_BAD_REQUEST)
        serializer = self.get_serializer(data=request.data)
        serializer.is_valid(raise_exception=True)
        user = serializer.save()
        return Response(
            {
                "user": UserSerializer(
                    user, context=self.get_serializer_context()
                ).data,
                "token": AuthToken.objects.create(user)[1],
            }
        )


class LoginAPI(generics.GenericAPIView):
    serializer_class = LoginUserSerializer

    def post(self, request, *args, **kwargs):
        serializer = self.get_serializer(data=request.data)
        serializer.is_valid(raise_exception=True)
        user = serializer.validated_data
        return Response(
            {
                "user": UserSerializer(
                    user, context=self.get_serializer_context()
                ).data,
                "token": AuthToken.objects.create(user)[1],
            }
        )


class UserAPI(generics.RetrieveAPIView):
    permission_classes = [permissions.IsAuthenticated]
    serializer_class = UserSerializer

    def get_object(self):
        return self.request.user


class UserListAPI(generics.ListAPIView):
    queryset = User.objects.all()
    serializer_class = UserSerializer


class UserUpdateAPI(generics.RetrieveUpdateAPIView):
    permission_classes = [permissions.IsAuthenticated]
    serializer_class = UpdateUserSerializer
    def retrieve(self, request, *args, **kwargs):
        serializer = self.serializer_class(request.user)
        return Response(serializer.data, status=status.HTTP_200_OK)
    def update(self, request, *args, **kwargs):
        serializer = self.serializer_class(request.user, data=request.data, partial=True)
        serializer.is_valid(raise_exception=True)
        serializer.save()
        return Response(serializer.data, status=status.HTTP_200_OK)