from .serializers import ClubSerializer, CourtSerializer, DateIntervalSerializer, TournamentSerializer, UserSerializer, ChangePasswordSerializer, EventSerializer, RoundSerializer, GroupStageSerializer, MatchSerializer, TeamScoreSerializer, TeamRegistrationSerializer, PlayerRegistrationSerializer, LiveMatchSerializer, PurchaseSerializer, CustomUserSerializer, FailedApiCallSerializer, LogSerializer, DeviceTokenSerializer
from tournaments.models import Club, Tournament, CustomUser, Event, Round, GroupStage, Match, TeamScore, TeamRegistration, PlayerRegistration, Court, DateInterval, Purchase, FailedApiCall, Log, DeviceToken, ModelLog

from rest_framework import viewsets, permissions
from rest_framework.authtoken.models import Token
from rest_framework.response import Response
from rest_framework.decorators import api_view
from rest_framework import status
from rest_framework.generics import UpdateAPIView
from rest_framework.exceptions import MethodNotAllowed
from rest_framework.permissions import IsAuthenticated
from rest_framework.views import APIView

from django.contrib.auth import authenticate
from django.db.models import Q
from django.core.exceptions import ObjectDoesNotExist
from django.utils import timezone
from django.apps import apps

from collections import defaultdict

from .permissions import IsClubOwner
from .utils import is_valid_email, build_serializer_class

class DataApi(APIView):
    permission_classes = [IsAuthenticated]

    def post(self, request, *args, **kwargs):

        # unfold content
        model_operation = request.data.get('operation')
        model_name = request.data.get('model_name')
        data = request.data.get('data')

        print(f"/data {model_operation} {model_name}")

        serializer_class = build_serializer_class(model_name)

        model = apps.get_model(app_label='tournaments', model_name=model_name)
        try:
            instance = model.objects.get(id=data.get('id'))

            if model_operation == 'DELETE':
                return self.delete_and_save_log(request, data, model_operation, model_name)
            else: # POST/PUT
                serializer = serializer_class(instance, data=data, context={'request': request})
                if serializer.is_valid():
                    if instance.last_update <= serializer.validated_data.get('last_update'):
                        print('>>> update')
                        return self.save_and_create_log(request, serializer, model_operation, model_name)
                    else:
                        print('>>> return 203')
                        return Response(serializer.data, status=status.HTTP_203_NON_AUTHORITATIVE_INFORMATION)
                else:
                    return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
        except model.DoesNotExist:
            # If the instance doesn't exist, we should be in a POST situation
            print('>>> insert')
            serializer = serializer_class(data=data, context={'request': request})
            if serializer.is_valid():
                return self.save_and_create_log(request, serializer, model_operation, model_name)
            else:
                return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

    def save_and_create_log(self, request, serializer, model_operation, model_name):
        instance = serializer.save()

        self.create_and_save_model_log(
            user=request.user,
            model_operation=model_operation,
            model_name=model_name,
            model_id=instance.id
        )

        return Response(serializer.data, status=status.HTTP_201_CREATED)

    def delete_and_save_log(self, request, data, model_operation, model_name):

        model = apps.get_model(app_label='tournaments', model_name=model_name)
        try:
            instance = model.objects.get(id=data.id)
            instance.delete()
        except model.DoesNotExist:
            return Response({"detail": "Not found."}, status=status.HTTP_404_NOT_FOUND)

        # we delete all logs linked to the instance because they won't be needed anymore
        ModelLog.objects.filter(model_id=instance.id).delete()

        self.create_and_save_model_log(
            user=request.user,
            model_operation=model_operation,
            model_name=model_name,
            model_id=instance.id
        )

        return Response(status=status.HTTP_204_NO_CONTENT)

    def create_and_save_model_log(self, user, model_operation, model_name, model_id):
        model_log = ModelLog()
        model_log.user = user
        model_log.operation = model_operation
        model_log.date = timezone.localtime(timezone.now())
        model_log.model_name = model_name
        model_log.model_id = model_id
        model_log.save()

    def get(self, request, *args, **kwargs):
        print('/data GET YEAH!')

        last_update = request.query_params.get('last_update')
        if not last_update:
            return Response({"error": "last_update parameter is required"}, status=status.HTTP_400_BAD_REQUEST)

        print(last_update)

        try:
            last_update = timezone.datetime.fromisoformat(last_update)
        except ValueError:
            return Response({"error": f"Invalid date format for last_update: {last_update}"}, status=status.HTTP_400_BAD_REQUEST)

        logs = ModelLog.objects.filter(date__gt=last_update).order_by('date')

        updates = defaultdict(dict)
        deletions = defaultdict(set)

        for log in logs:
            model = apps.get_model(app_label='tournaments', model_name=log.model_name)

            if log.operation in ['POST', 'PUT']:
                try:
                    instance = model.objects.get(id=log.model_id)
                    serializer_class = build_serializer_class(log.model_name)
                    serializer = serializer_class(instance)
                    updates[log.model_name][log.model_id] = serializer.data
                except model.DoesNotExist:
                    # If the instance doesn't exist, it might have been deleted after this log was created
                    pass
            elif log.operation == 'DELETE':
                deletions[log.model_name].add(log.model_id)

        # Convert updates dict to list for each model
        for model_name in updates:
            updates[model_name] = list(updates[model_name].values())

        # Convert deletions set to list for each model
        for model_name in deletions:
            deletions[model_name] = list(deletions[model_name])

        # local_time = timezone.localtime(timezone.now())
        # print(local_time.isoformat(timespec='seconds'))


        date = logs.last().date.astimezone().isoformat(timespec='seconds') if logs else None
        print(date)

        response_data = {
            "updates": dict(updates),
            "deletions": dict(deletions),
            "date": date
        }

        return Response(response_data, status=status.HTTP_200_OK)

class CustomAuthToken(APIView):
    permission_classes = []

    def post(self, request, *args, **kwargs):
        username = request.data.get('username')
        password = request.data.get('password')
        device_id = request.data.get('device_id')

        user = authenticate(username=username, password=password)

        if user is None and is_valid_email(username) == True:
            true_username = self.get_username_from_email(username)
            user = authenticate(username=true_username, password=password)

        if user is not None:

            # if user.device_id is None or user.device_id == device_id or user.username == 'apple-test':
            # if user.device_id is None or user.device_id == device_id or user.username == 'apple-test':
                user.device_id = device_id
                user.save()

                token, created = Token.objects.get_or_create(user=user)
                return Response({'token': token.key})
            # else:
            #     return Response({'error': 'Vous ne pouvez pour l\'instant vous connecter sur plusieurs appareils en même temps. Veuillez vous déconnecter du précédent appareil. Autrement, veuillez contacter le support.'}, status=status.HTTP_403_FORBIDDEN)
        else:
            return Response({'error': 'L\'utilisateur et le mot de passe de correspondent pas'}, status=status.HTTP_401_UNAUTHORIZED)

    def get_username_from_email(self, email):
        try:
            user = CustomUser.objects.get(email=email)
            return user.username
        except ObjectDoesNotExist:
            return None  # or handle the case where the user doesn't exist

class Logout(APIView):
    permission_classes = (IsAuthenticated,)

    def post(self, request, *args, **kwargs):
        request.user.auth_token.delete()

        device_id = request.data.get('device_id')
        if request.user.device_id == device_id:
            request.user.device_id = None
            request.user.save()

        return Response(status=status.HTTP_200_OK)

@api_view(['GET'])
def user_by_token(request):
    serializer = UserSerializer(request.user)
    return Response(serializer.data, status=status.HTTP_200_OK)

class UserViewSet(viewsets.ModelViewSet):
    queryset = CustomUser.objects.all()
    serializer_class = CustomUserSerializer
    permission_classes = [] # Users are public whereas the other requests are only for logged users

    def get_serializer_class(self):
        # Use UserSerializer for other actions (e.g., create, retrieve)
        if self.action in ['create', 'retrieve']:
            return UserSerializer
        return self.serializer_class

class ClubViewSet(viewsets.ModelViewSet):
    queryset = Club.objects.all()
    serializer_class = ClubSerializer
    permission_classes = [IsClubOwner] # Clubs are public whereas the other requests are only for logged users

    def perform_create(self, serializer):
        serializer.save(creator=self.request.user)

class TournamentViewSet(viewsets.ModelViewSet):
    queryset = Tournament.objects.all()
    serializer_class = TournamentSerializer

    def get_queryset(self):
        if self.request.user.is_anonymous:
            return []
        return self.queryset.filter(event__creator=self.request.user)

class PurchaseViewSet(viewsets.ModelViewSet):
    queryset = Purchase.objects.all()
    serializer_class = PurchaseSerializer

    def get_queryset(self):
        if self.request.user:
            return self.queryset.filter(user=self.request.user)
        return []

    def put(self, request, pk):
        raise MethodNotAllowed('PUT')

    def patch(self, request, pk):
        raise MethodNotAllowed('PATCH')

    def delete(self, request, pk):
        raise MethodNotAllowed('DELETE')

# class ExpandedTournamentViewSet(viewsets.ModelViewSet):
#     queryset = Tournament.objects.all()
#     serializer_class = ExpandedTournamentSerializer

class ChangePasswordView(UpdateAPIView):
    serializer_class = ChangePasswordSerializer

    def update(self, request, *args, **kwargs):
        serializer = self.get_serializer(data=request.data)
        serializer.is_valid(raise_exception=True)
        user = serializer.save()
        # if using drf authtoken, create a new token
        if hasattr(user, 'auth_token'):
            user.auth_token.delete()
        token, created = Token.objects.get_or_create(user=user)
        # return new token
        return Response({'token': token.key}, status=status.HTTP_200_OK)

class EventViewSet(viewsets.ModelViewSet):
    queryset = Event.objects.all()
    serializer_class = EventSerializer

    def get_queryset(self):
        if self.request.user.is_anonymous:
            return []
        return self.queryset.filter(creator=self.request.user)

class RoundViewSet(viewsets.ModelViewSet):
    queryset = Round.objects.all()
    serializer_class = RoundSerializer

    def get_queryset(self):
        tournament_id = self.request.query_params.get('tournament')
        if tournament_id:
            return self.queryset.filter(tournament=tournament_id)
        if self.request.user:
            return self.queryset.filter(tournament__event__creator=self.request.user)
        return []

class GroupStageViewSet(viewsets.ModelViewSet):
    queryset = GroupStage.objects.all()
    serializer_class = GroupStageSerializer

    def get_queryset(self):
        tournament_id = self.request.query_params.get('tournament')
        if tournament_id:
            return self.queryset.filter(tournament=tournament_id)
        if self.request.user:
            return self.queryset.filter(tournament__event__creator=self.request.user)
        return []

class MatchViewSet(viewsets.ModelViewSet):
    queryset = Match.objects.all()
    serializer_class = MatchSerializer

    def get_queryset(self):
        tournament_id = self.request.query_params.get('tournament')
        if tournament_id:
            return self.queryset.filter(Q(group_stage__tournament=tournament_id) | Q(round__tournament=tournament_id))
        if self.request.user:
            return self.queryset.filter(Q(group_stage__tournament__event__creator=self.request.user) | Q(round__tournament__event__creator=self.request.user))
        return []

class TeamScoreViewSet(viewsets.ModelViewSet):
    queryset = TeamScore.objects.all()
    serializer_class = TeamScoreSerializer

    def get_queryset(self):
        tournament_id = self.request.query_params.get('tournament')
        if tournament_id:
            return self.queryset.filter(team_registration__tournament=tournament_id)
        if self.request.user:
            return self.queryset.filter(team_registration__tournament__event__creator=self.request.user)
        return []

class TeamRegistrationViewSet(viewsets.ModelViewSet):
    queryset = TeamRegistration.objects.all()
    serializer_class = TeamRegistrationSerializer

    def get_queryset(self):
        tournament_id = self.request.query_params.get('tournament')
        if tournament_id:
            return self.queryset.filter(tournament=tournament_id)
        if self.request.user:
            return self.queryset.filter(tournament__event__creator=self.request.user)
        return []

class PlayerRegistrationViewSet(viewsets.ModelViewSet):
    queryset = PlayerRegistration.objects.all()
    serializer_class = PlayerRegistrationSerializer

    def get_queryset(self):
        tournament_id = self.request.query_params.get('tournament')
        if tournament_id:
            return self.queryset.filter(team_registration__tournament=tournament_id)
        if self.request.user:
            return self.queryset.filter(team_registration__tournament__event__creator=self.request.user)
        return []

class CourtViewSet(viewsets.ModelViewSet):
    queryset = Court.objects.all()
    serializer_class = CourtSerializer

class DateIntervalViewSet(viewsets.ModelViewSet):
    queryset = DateInterval.objects.all()
    serializer_class = DateIntervalSerializer

    def get_queryset(self):
        if self.request.user:
            return self.queryset.filter(event__creator=self.request.user)
        return []

class FailedApiCallViewSet(viewsets.ModelViewSet):
    queryset = FailedApiCall.objects.all()
    serializer_class = FailedApiCallSerializer
    permission_classes = [] # FailedApiCall are public whereas the other requests are only for logged users

    def get_queryset(self):
        return []

    def perform_create(self, serializer):
        if self.request.user.is_anonymous == False:
            serializer.save(user=self.request.user)
        else:
            serializer.save()

class LogViewSet(viewsets.ModelViewSet):
    queryset = Log.objects.all()
    serializer_class = LogSerializer
    permission_classes = [] # Log are public whereas the other requests are only for logged users

    def get_queryset(self):
        return []

    def perform_create(self, serializer):
        if self.request.user.is_anonymous == False:
            serializer.save(user=self.request.user)
        else:
            serializer.save()

class DeviceTokenViewSet(viewsets.ModelViewSet):
    queryset = DeviceToken.objects.all()
    serializer_class = DeviceTokenSerializer

    def get_queryset(self):
        if self.request.user:
            return self.queryset.filter(user=self.request.user)
        return []

    def create(self, request, *args, **kwargs):
        value = request.data.get('value')
        if DeviceToken.objects.filter(value=value).exists():
            return Response({"detail": "This device token is already registered."}, status=208)

        serializer = self.get_serializer(data=request.data)
        serializer.is_valid(raise_exception=True)
        self.perform_create(serializer)
        headers = self.get_success_headers(serializer.data)
        return Response(serializer.data, status=status.HTTP_201_CREATED, headers=headers)

    def perform_create(self, serializer):
        serializer.save(user=self.request.user)