from snippets.models import Snippet
from snippets.serializers import SnippetSerializer, UserSerializer
from rest_framework.decorators import api_view, action
from rest_framework.response import Response
from rest_framework.reverse import reverse
from rest_framework import generics, permissions, renderers, viewsets
from django.contrib.auth.models import User
from snippets.permissions import IsOwnerOrReadOnly

@api_view(['GET'])
def api_root(request, format=None):
    return Response({
        'users': reverse('user-list', request=request, format=format),
        'snippets': reverse('snippet-list', request=request, format=format)
    })

class SnippetViewSet(viewsets.ModelViewSet):
    """
    This viewset automatically provides `list`, `create`, `retrieve`,
    `update` and `destroy` actions.

    Additionally we also provide an extra `highlight` action.
    """
    queryset = Snippet.objects.all()
    serializer_class = SnippetSerializer
    permission_classes = [permissions.IsAuthenticatedOrReadOnly, IsOwnerOrReadOnly]
    
    @action(detail = True, renderers_classes = [renderers.StaticHTMLRenderer])
    def highlight(self, request, *args, **kwargs):
        snippet = self.get_object()
        return Response(snippet.hightlighted)
    
    def perform_create(self, serializer):
        serializer.save(owner = self.request.user)

class UserViewSet(viewsets.ReadOnlyModelViewSet):
    """
    This viewset automatically provides `list` and `detail` actions.
    """
    queryset = User.objects.all()
    serializer_class = UserSerializer


'''version four
from snippets.models import Snippet
from snippets.serializers import SnippetSerializer
from rest_framework import mixins, generics

class SnippetList(mixins.ListModelMixin,
                  mixins.CreateModelMixin,
                  generics.GenericAPIView):
    queryset = Snippet.objects.all()
    serializer_class = SnippetSerializer
    
    def get(self, request, *args, **kwargs):
        return self.list(request, *args, **kwargs)
    
    def post(self, request, *args, **kwargs):
        return self.create(request, *args, **kwargs)
        
class SnippetDetail(mixins.RetrieveModelMixin,
                    mixins.UpdateModelMixin,
                    mixins.DestroyModelMixin,
                    generics.GenericAPIView):
    queryset = Snippet.objects.all()
    serializer_class = SnippetSerializer

    def get(self, request, *args, **kwargs):
        return self.retrieve(request, *args, **kwargs)

    def put(self, request, *args, **kwargs):
        return self.update(request, *args, **kwargs)

    def delete(self, request, *args, **kwargs):
        return self.destroy(request, *args, **kwargs)
'''

'''version three
from snippets.models import Snippet
from snippets.serializers import SnippetSerializer
from django.http import Http404
from rest_framework.views import APIView
from rest_framework.response import Response
from rest_framework import status

class SnippetList():
    """
    List all snippets, or create a new snippet.
    """
    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()
            return Response(serializer.data, status = status.HTTP_201_CREATED)
        return Response(serializer.errors, status = status.HTTP_400_BAD_REQUEST)

class SnippetDetail(APIView):
    """
    Retrieve, update or delete a snippet instance.
    """
    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, format = None):
        snippet = Snippet.objects.get(pk)
        serializer = SnippetSerializer(snippet, data = request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data)
        return Response(serializer.errors, status = status.HTTP_400_BAD_REQUEST)
    
    def delete(self, request, pk, format= None):
        snippet = Snippet.objects.get(pk = pk)
        snippet.delete()
        return Response(status = status.HTTP_204_NO_CONTENT)
'''

'''version two
from rest_framework import status
from rest_framework.decorators import api_view
from rest_framework.response import Response
from snippets.models import Snippet
from snippets.serializers import SnippetSerializer

@api_view(['GET', 'POST'])
def snippet_list(request, format = None):
    if request.method == 'GET':
        snippets = Snippet.objects.all()
        serializer = SnippetSerializer(snippets, many = True)
        return Response(serializer.data)
    
    elif request.method == 'POST':
        serializer = SnippetSerializer(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)
    
@api_view(['GET', 'PUT', 'DELETE'])
def snippet_detail(request, pk, format = None):
    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':
        serializer = SnippetSerializer(snippet, data = request.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)
'''
''' version one
from django.http import HttpResponse, JsonResponse
from django.views.decorators.csrf import csrf_exempt
from rest_framework.parsers import JSONParser
from snippets.models import Snippet
from snippets.serializers import SnippetSerializer

@csrf_exempt
def snippet_list(request):
    """
    List all code snippets, or create a new snippet.
    """
    if request.method == 'GET':
        snippets = Snippet.objects.all()
        serializer = SnippetSerializer(snippets, many=True)
        return JsonResponse(serializer.data, safe=False)

    elif request.method == 'POST':
        data = JSONParser().parse(request)
        serializer = SnippetSerializer(data=data)
        if serializer.is_valid():
            serializer.save()
            return JsonResponse(serializer.data, status=201)
        return JsonResponse(serializer.errors, status=400)

@csrf_exempt
def snippet_detail(request, pk):
    """
    Retrieve, update or delete a code snippet.
    """
    try:
        snippet = Snippet.objects.get(pk=pk)
    except Snippet.DoesNotExist:
        return HttpResponse(status=404)

    if request.method == 'GET':
        serializer = SnippetSerializer(snippet)
        return JsonResponse(serializer.data)

    elif request.method == 'PUT':
        data = JSONParser().parse(request)
        serializer = SnippetSerializer(snippet, data=data)
        if serializer.is_valid():
            serializer.save()
            return JsonResponse(serializer.data)
        return JsonResponse(serializer.errors, status=400)

    elif request.method == 'DELETE':
        snippet.delete()
        return HttpResponse(status=204)
'''        