from rest_framework import status
from rest_framework.decorators import api_view 
from rest_framework.response import Response
from rest_framework.views import APIView
from rest_framework.permissions import IsAuthenticatedOrReadOnly 
from django.http import Http404

from django.contrib.auth.models import User

from snippets.models import Snippet
from snippets.serializers import SnippetSerializer, UserSerializer

# @api_view(["GET", "POST"])
# def snippet_list(request):

#     if request.method == "GET":
#         snippets = Snippet.objects.all()
#         serializer = SnippetSerializer(snippets, many=True)
#         return Response(serializer.data)

#     elif request.method == "POST":
#         data = JSONParser().parse(request)
#         serializer = SnippetSerializer(data=data)
#         if serializer.is_valid():
#             serializer.save()
#             return Response(serializer.data, status=status.HTTP_201_CREATED)
#         return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)


class SnippetList(APIView):

    permission_classes = [IsAuthenticatedOrReadOnly]

    def get(self, request, format=None):
        snippets = Snippet.objects.all()
        serializer = SnippetSerializer(snippets, many=True)
        return Response(serializer.data)

    def post(self, request, format=None):
        serializer = SnippetSerializer(data=request.data)
        if serializer.is_valid():
            serializer.save(owner=request.user)
            return Response(serializer.data, status=status.HTTP_201_CREATED)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)


# @api_view(["GET", "PUT", "DELETE"])
# def snippet_detail(request, pk):

#     try:
#         snippet = Snippet.objects.get(pk=pk)
#     except Snippet.DoesNotExist:
#         return Response(status=status.HTTP_404_NOT_FOUND)

#     if request.method == "GET":
#         serializer = SnippetSerializer(snippet)
#         return Response(serializer.data)

#     elif request.method == "PUT":
#         data = JSONParser().parse(request)
#         serializer = SnippetSerializer(snippet, data=data)
#         if serializer.is_valid():
#             serializer.save()
#             return Response(serializer.data)
#         return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

#     elif request.method == "DELETE":
#         snippet.delete()
#         return Response(status=status.HTTP_204_NO_CONTENT) 

class SnippetDetail(APIView):

    permission_classes = [IsAuthenticatedOrReadOnly]

    def get_object(self, pk):
        try:
            return Snippet.objects.get(pk=pk)
        except Snippet.DoesNotExist:
            raise Http404

    def get(self, request, pk, format=None):
        snippet = self.get_object(pk)
        serializer = SnippetSerializer(snippet)
        return Response(serializer.data)

    def put(self, request, pk):
        snippet = self.get_object(pk)
        serializer = SnippetSerializer(snippet, data=request.data) 
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data, status=status.HTTP_201_CREATED)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

    def delete(self, request, pk):
        snippet = self.get_object(pk)
        snippet.delete()
        return Response(status=status.HTTP_204_NO_CONTENT)
 

class UserList(APIView):
    permission_classes = [IsAuthenticatedOrReadOnly]

    def get(self, request, format=None):
        user = User.objects.all()
        serializer = UserSerializer(user, many=True)
        return Response(serializer.data, status=status.HTTP_200_OK)

class UserDetail(APIView):

    permission_classes = [IsAuthenticatedOrReadOnly]

    def get_user(self, pk):
        try:
            return User.objects.get(pk=pk)
        except User.DoesNotExist:
            raise Http404

    def get(self, request, pk, format=None):
        user = self.get_user(pk=pk)
        serializer = UserSerializer(user)
        return Response(serializer.data)