import json
import uuid
import requests
from django.db import transaction
from rest_framework.decorators import action
from rest_framework import viewsets
from django.db.models.functions import Lower
from rest_framework.response import Response
from .models import Adventure, Checklist, Collection, Transportation, Note, AdventureImage, Category
from django.core.exceptions import PermissionDenied
from worldtravel.models import VisitedRegion, Region, Country
from .serializers import AdventureImageSerializer, AdventureSerializer, CategorySerializer, CollectionSerializer, NoteSerializer, TransportationSerializer, ChecklistSerializer
from rest_framework.permissions import IsAuthenticated
from django.db.models import Q
from .permissions import CollectionShared, IsOwnerOrSharedWithFullAccess, IsPublicOrOwnerOrSharedWithFullAccess
from rest_framework.pagination import PageNumberPagination
from django.shortcuts import get_object_or_404
from rest_framework import status
from django.contrib.auth import get_user_model
from icalendar import Calendar, Event, vText, vCalAddress
from django.http import HttpResponse
from datetime import datetime

User = get_user_model()

class StandardResultsSetPagination(PageNumberPagination):
    page_size = 25
    page_size_query_param = 'page_size'
    max_page_size = 1000

from rest_framework.pagination import PageNumberPagination

from rest_framework.decorators import action
from rest_framework.response import Response
from django.db.models import Q

class AdventureViewSet(viewsets.ModelViewSet):
    serializer_class = AdventureSerializer
    permission_classes = [IsOwnerOrSharedWithFullAccess, IsPublicOrOwnerOrSharedWithFullAccess]
    pagination_class = StandardResultsSetPagination

    def apply_sorting(self, queryset):
        order_by = self.request.query_params.get('order_by', 'updated_at')
        order_direction = self.request.query_params.get('order_direction', 'asc')
        include_collections = self.request.query_params.get('include_collections', 'true')

        valid_order_by = ['name', 'type', 'start_date', 'rating', 'updated_at']
        if order_by not in valid_order_by:
            order_by = 'name'

        if order_direction not in ['asc', 'desc']:
            order_direction = 'asc'

        # Apply case-insensitive sorting for the 'name' field
        if order_by == 'name':
            queryset = queryset.annotate(lower_name=Lower('name'))
            ordering = 'lower_name'
        else:
            ordering = order_by

        if order_direction == 'desc':
            ordering = f'-{ordering}'

        # reverse ordering for updated_at field
        if order_by == 'updated_at':
            if order_direction == 'asc':
                ordering = '-updated_at'
            else:
                ordering = 'updated_at'

        print(f"Ordering by: {ordering}")  # For debugging

        if include_collections == 'false':
            queryset = queryset.filter(collection = None)

        return queryset.order_by(ordering)

    def get_queryset(self):
        print(self.request.user)
        # if the user is not authenticated return only public adventures for retrieve action
        if not self.request.user.is_authenticated:
            if self.action == 'retrieve':
                return Adventure.objects.filter(is_public=True).distinct().order_by('-updated_at')
            return Adventure.objects.none()

        if self.action == 'retrieve':
            # For individual adventure retrieval, include public adventures
            return Adventure.objects.filter(
                Q(is_public=True) | Q(user_id=self.request.user.id) | Q(collection__shared_with=self.request.user)
            ).distinct().order_by('-updated_at')
        else:
            # For other actions, include user's own adventures and shared adventures
            return Adventure.objects.filter(
                Q(user_id=self.request.user.id) | Q(collection__shared_with=self.request.user)
            ).distinct().order_by('-updated_at')

    def retrieve(self, request, *args, **kwargs):
        queryset = self.get_queryset()
        adventure = get_object_or_404(queryset, pk=kwargs['pk'])
        serializer = self.get_serializer(adventure)
        return Response(serializer.data)

    def perform_update(self, serializer):
        adventure = serializer.save()
        if adventure.collection:
            adventure.is_public = adventure.collection.is_public
            adventure.save()
        
    @action(detail=False, methods=['get'])
    def filtered(self, request):
        types = request.query_params.get('types', '').split(',')
        is_visited = request.query_params.get('is_visited', 'all')

        # Handle case where types is all
        if 'all' in types:
            types = Category.objects.filter(user_id=request.user).values_list('name', flat=True)
        
        else:
            for type in types:
                if not Category.objects.filter(user_id=request.user, name=type).exists():
                    return Response({"error": f"Category {type} does not exist"}, status=400)

            if not types:
                return Response({"error": "At least one type must be provided"}, status=400)

        queryset = Adventure.objects.filter(
            category__in=Category.objects.filter(name__in=types, user_id=request.user),
            user_id=request.user.id
        )

        # Handle is_visited filtering
        if is_visited.lower() == 'true':
            serializer = self.get_serializer(queryset, many=True)
            filtered_ids = [
                adventure.id for adventure, serialized_adventure in zip(queryset, serializer.data)
                if serialized_adventure['is_visited']
            ]
            queryset = queryset.filter(id__in=filtered_ids)
        elif is_visited.lower() == 'false':
            serializer = self.get_serializer(queryset, many=True)
            filtered_ids = [
                adventure.id for adventure, serialized_adventure in zip(queryset, serializer.data)
                if not serialized_adventure['is_visited']
            ]
            queryset = queryset.filter(id__in=filtered_ids)
        # If is_visited is 'all' or any other value, we don't apply additional filtering

        # Apply sorting
        queryset = self.apply_sorting(queryset)

        # Paginate and respond
        adventures = self.paginate_and_respond(queryset, request)
        return adventures
        
    @action(detail=False, methods=['get'])
    def all(self, request):
        if not request.user.is_authenticated:
            return Response({"error": "User is not authenticated"}, status=400)
        include_collections = request.query_params.get('include_collections', 'false')
        if include_collections not in ['true', 'false']:
            include_collections = 'false'

        if include_collections == 'true':
            queryset = Adventure.objects.filter(
                Q(is_public=True) | Q(user_id=request.user.id)
            )
        else:
            queryset = Adventure.objects.filter(
                Q(is_public=True) | Q(user_id=request.user.id), collection=None
            )
        queryset = Adventure.objects.filter(
            Q(user_id=request.user.id)
        )
        queryset = self.apply_sorting(queryset)
        serializer = self.get_serializer(queryset, many=True)
       
        return Response(serializer.data)
    
    @action(detail=False, methods=['get'])
    def search(self, request):
        query = self.request.query_params.get('query', '')
        property = self.request.query_params.get('property', 'all')
        if len(query) < 2:
            return Response({"error": "Query must be at least 2 characters long"}, status=400)
        
        if property not in ['name', 'type', 'location', 'description', 'activity_types']:
            property = 'all'

        queryset = Adventure.objects.none()

        if property == 'name':
            queryset = Adventure.objects.filter(
                (Q(name__icontains=query)) &
                (Q(user_id=request.user.id) | Q(is_public=True))
            )
        elif property == 'type':
            queryset = Adventure.objects.filter(
                (Q(type__icontains=query)) &
                (Q(user_id=request.user.id) | Q(is_public=True))
            )
        elif property == 'location':
            queryset = Adventure.objects.filter(
                (Q(location__icontains=query)) &
                (Q(user_id=request.user.id) | Q(is_public=True))
            )
        elif property == 'description':
            queryset = Adventure.objects.filter(
                (Q(description__icontains=query)) &
                (Q(user_id=request.user.id) | Q(is_public=True))
            )
        elif property == 'activity_types':
            queryset = Adventure.objects.filter(
                (Q(activity_types__icontains=query)) &
                (Q(user_id=request.user.id) | Q(is_public=True))
            )
        else:
            queryset = Adventure.objects.filter(
            (Q(name__icontains=query) | Q(description__icontains=query) | Q(location__icontains=query) | Q(activity_types__icontains=query)) &
            (Q(user_id=request.user.id) | Q(is_public=True))
        )
        
        queryset = self.apply_sorting(queryset)
        serializer = self.get_serializer(queryset, many=True)
        return Response(serializer.data)
    
    def update(self, request, *args, **kwargs):
        # Retrieve the current object
        instance = self.get_object()
        
        # Partially update the instance with the request data
        serializer = self.get_serializer(instance, data=request.data, partial=True)
        serializer.is_valid(raise_exception=True)

        # if the adventure is trying to have is_public changed and its part of a collection return an error
        if new_collection is not None:
            serializer.validated_data['is_public'] = new_collection.is_public
        elif instance.collection:
            serializer.validated_data['is_public'] = instance.collection.is_public


        # Retrieve the collection from the validated data
        new_collection = serializer.validated_data.get('collection')

        user = request.user
        print(new_collection)

        if new_collection is not None and new_collection!=instance.collection:
            # Check if the user is the owner of the new collection
            if new_collection.user_id != user or instance.user_id != user:
                raise PermissionDenied("You do not have permission to use this collection.")
        elif new_collection is None:
            # Handle the case where the user is trying to set the collection to None
            if instance.collection is not None and instance.collection.user_id != user:
                raise PermissionDenied("You cannot remove the collection as you are not the owner.")
        
        # Perform the update
        self.perform_update(serializer)

        # Return the updated instance
        return Response(serializer.data)
    
    def partial_update(self, request, *args, **kwargs):
        # Retrieve the current object
        instance = self.get_object()
        
        # Partially update the instance with the request data
        serializer = self.get_serializer(instance, data=request.data, partial=True)
        serializer.is_valid(raise_exception=True)

        # Retrieve the collection from the validated data
        new_collection = serializer.validated_data.get('collection')

        user = request.user
        print(new_collection)

        # if the adventure is trying to have is_public changed and its part of a collection return an error
        if new_collection is not None:
            serializer.validated_data['is_public'] = new_collection.is_public
        elif instance.collection:
            serializer.validated_data['is_public'] = instance.collection.is_public

        if new_collection is not None and new_collection!=instance.collection:
            # Check if the user is the owner of the new collection
            if new_collection.user_id != user or instance.user_id != user:
                raise PermissionDenied("You do not have permission to use this collection.")
        elif new_collection is None:
            # Handle the case where the user is trying to set the collection to None
            if instance.collection is not None and instance.collection.user_id != user:
                raise PermissionDenied("You cannot remove the collection as you are not the owner.")
        
        # Perform the update
        self.perform_update(serializer)

        # Return the updated instance
        return Response(serializer.data)

    def perform_update(self, serializer):
        serializer.save()
    
    # when creating an adventure, make sure the user is the owner of the collection or shared with the collection
    @transaction.atomic
    def perform_create(self, serializer):
        # Retrieve the collection from the validated data
        collection = serializer.validated_data.get('collection')
        
        # Check if a collection is provided
        if collection:
            user = self.request.user
            # Check if the user is the owner or is in the shared_with list
            if collection.user_id != user and not collection.shared_with.filter(id=user.id).exists():
                # Return an error response if the user does not have permission
                raise PermissionDenied("You do not have permission to use this collection.")
            # if collection the owner of the adventure is the owner of the collection
            # set the is_public field of the adventure to the is_public field of the collection
            serializer.save(user_id=collection.user_id, is_public=collection.is_public)
            return

        # Save the adventure with the current user as the owner
        serializer.save(user_id=self.request.user)

    def paginate_and_respond(self, queryset, request):
        paginator = self.pagination_class()
        page = paginator.paginate_queryset(queryset, request)
        if page is not None:
            serializer = self.get_serializer(page, many=True)
            return paginator.get_paginated_response(serializer.data)
        serializer = self.get_serializer(queryset, many=True)
        return Response(serializer.data)
    
class CollectionViewSet(viewsets.ModelViewSet):
    serializer_class = CollectionSerializer
    permission_classes = [CollectionShared]
    pagination_class = StandardResultsSetPagination

    # def get_queryset(self):
    #     return Collection.objects.filter(Q(user_id=self.request.user.id) & Q(is_archived=False))

    def apply_sorting(self, queryset):
        order_by = self.request.query_params.get('order_by', 'name')
        order_direction = self.request.query_params.get('order_direction', 'asc')

        valid_order_by = ['name', 'upated_at']
        if order_by not in valid_order_by:
            order_by = 'updated_at'

        if order_direction not in ['asc', 'desc']:
            order_direction = 'asc'

        # Apply case-insensitive sorting for the 'name' field
        if order_by == 'name':
            queryset = queryset.annotate(lower_name=Lower('name'))
            ordering = 'lower_name'
            if order_direction == 'desc':
                ordering = f'-{ordering}'
        else:
            order_by == 'updated_at'
            ordering = 'updated_at'
            if order_direction == 'asc':
                ordering = '-updated_at'

        #print(f"Ordering by: {ordering}")  # For debugging

        return queryset.order_by(ordering)
    
    def list(self, request, *args, **kwargs):
        # make sure the user is authenticated
        if not request.user.is_authenticated:
            return Response({"error": "User is not authenticated"}, status=400)
        queryset = Collection.objects.filter(user_id=request.user.id)
        queryset = self.apply_sorting(queryset)
        collections = self.paginate_and_respond(queryset, request)
        return collections
    
    @action(detail=False, methods=['get'])
    def all(self, request):
        if not request.user.is_authenticated:
            return Response({"error": "User is not authenticated"}, status=400)
       
        queryset = Collection.objects.filter(
            Q(user_id=request.user.id)
        )
        
        queryset = self.apply_sorting(queryset)
        serializer = self.get_serializer(queryset, many=True)
       
        return Response(serializer.data)
    
    @action(detail=False, methods=['get'])
    def archived(self, request):
        if not request.user.is_authenticated:
            return Response({"error": "User is not authenticated"}, status=400)
       
        queryset = Collection.objects.filter(
            Q(user_id=request.user.id) & Q(is_archived=True)
        )
        
        queryset = self.apply_sorting(queryset)
        serializer = self.get_serializer(queryset, many=True)
       
        return Response(serializer.data)
    
    # this make the is_public field of the collection cascade to the adventures
    @transaction.atomic
    def update(self, request, *args, **kwargs):
        partial = kwargs.pop('partial', False)
        instance = self.get_object()
        serializer = self.get_serializer(instance, data=request.data, partial=partial)
        serializer.is_valid(raise_exception=True)

        if 'collection' in serializer.validated_data:
            new_collection = serializer.validated_data['collection']
            # if the new collection is different from the old one and the user making the request is not the owner of the new collection return an error
            if new_collection != instance.collection and new_collection.user_id != request.user:
                return Response({"error": "User does not own the new collection"}, status=400)

        # Check if the 'is_public' field is present in the update data
        if 'is_public' in serializer.validated_data:
            new_public_status = serializer.validated_data['is_public']
            
            # if is_publuc has changed and the user is not the owner of the collection return an error
            if new_public_status != instance.is_public and instance.user_id != request.user:
                print(f"User {request.user.id} does not own the collection {instance.id} that is owned by {instance.user_id}")
                return Response({"error": "User does not own the collection"}, status=400)

            # Update associated adventures to match the collection's is_public status
            Adventure.objects.filter(collection=instance).update(is_public=new_public_status)

            # do the same for transportations
            Transportation.objects.filter(collection=instance).update(is_public=new_public_status)

            # do the same for notes
            Note.objects.filter(collection=instance).update(is_public=new_public_status)

            # Log the action (optional)
            action = "public" if new_public_status else "private"
            print(f"Collection {instance.id} and its adventures were set to {action}")

        self.perform_update(serializer)

        if getattr(instance, '_prefetched_objects_cache', None):
            # If 'prefetch_related' has been applied to a queryset, we need to
            # forcibly invalidate the prefetch cache on the instance.
            instance._prefetched_objects_cache = {}

        return Response(serializer.data)
    
    # make an action to retreive all adventures that are shared with the user
    @action(detail=False, methods=['get'])
    def shared(self, request):
        if not request.user.is_authenticated:
            return Response({"error": "User is not authenticated"}, status=400)
        queryset = Collection.objects.filter(
            shared_with=request.user
        )
        queryset = self.apply_sorting(queryset)
        serializer = self.get_serializer(queryset, many=True)
        return Response(serializer.data)
    
    # Adds a new user to the shared_with field of an adventure
    @action(detail=True, methods=['post'], url_path='share/(?P<uuid>[^/.]+)')
    def share(self, request, pk=None, uuid=None):
        collection = self.get_object()
        if not uuid:
            return Response({"error": "User UUID is required"}, status=400)
        try:
            user = User.objects.get(uuid=uuid, public_profile=True)
        except User.DoesNotExist:
            return Response({"error": "User not found"}, status=404)
        
        if user == request.user:
            return Response({"error": "Cannot share with yourself"}, status=400)
        
        if collection.shared_with.filter(id=user.id).exists():
            return Response({"error": "Adventure is already shared with this user"}, status=400)
        
        collection.shared_with.add(user)
        collection.save()
        return Response({"success": f"Shared with {user.username}"})
    
    @action(detail=True, methods=['post'], url_path='unshare/(?P<uuid>[^/.]+)')
    def unshare(self, request, pk=None, uuid=None):
        if not request.user.is_authenticated:
            return Response({"error": "User is not authenticated"}, status=400)
        collection = self.get_object()
        if not uuid:
            return Response({"error": "User UUID is required"}, status=400)
        try:
            user = User.objects.get(uuid=uuid, public_profile=True)
        except User.DoesNotExist:
            return Response({"error": "User not found"}, status=404)
        
        if user == request.user:
            return Response({"error": "Cannot unshare with yourself"}, status=400)
        
        if not collection.shared_with.filter(id=user.id).exists():
            return Response({"error": "Collection is not shared with this user"}, status=400)
        
        collection.shared_with.remove(user)
        collection.save()
        return Response({"success": f"Unshared with {user.username}"})

    def get_queryset(self):
        if self.action == 'destroy':
            return Collection.objects.filter(user_id=self.request.user.id)
        
        if self.action in ['update', 'partial_update']:
            return Collection.objects.filter(
                Q(user_id=self.request.user.id) | Q(shared_with=self.request.user)
            ).distinct()
        
        if self.action == 'retrieve':
            if not self.request.user.is_authenticated:
                return Collection.objects.filter(is_public=True)
            return Collection.objects.filter(
                Q(is_public=True) | Q(user_id=self.request.user.id) | Q(shared_with=self.request.user)
            ).distinct()
        
        # For list action, include collections owned by the user or shared with the user, that are not archived
        return Collection.objects.filter(
            (Q(user_id=self.request.user.id) | Q(shared_with=self.request.user)) & Q(is_archived=False)
        ).distinct()


    def perform_create(self, serializer):
        # This is ok because you cannot share a collection when creating it
        serializer.save(user_id=self.request.user)
    
    def paginate_and_respond(self, queryset, request):
        paginator = self.pagination_class()
        page = paginator.paginate_queryset(queryset, request)
        if page is not None:
            serializer = self.get_serializer(page, many=True)
            return paginator.get_paginated_response(serializer.data)
        serializer = self.get_serializer(queryset, many=True)
        return Response(serializer.data)
    
class StatsViewSet(viewsets.ViewSet):
    permission_classes = [IsAuthenticated]

    @action(detail=False, methods=['get'])
    def counts(self, request):
        adventure_count = Adventure.objects.filter(
            user_id=request.user.id).count()
        trips_count = Collection.objects.filter(
            user_id=request.user.id).count()
        visited_region_count = VisitedRegion.objects.filter(
            user_id=request.user.id).count()
        total_regions = Region.objects.count()
        country_count = VisitedRegion.objects.filter(
            user_id=request.user.id).values('region__country').distinct().count()
        total_countries = Country.objects.count()
        return Response({
            'adventure_count': adventure_count,
            'trips_count': trips_count,
            'visited_region_count': visited_region_count,
            'total_regions': total_regions,
            'country_count': country_count,
            'total_countries': total_countries
        })
    
class GenerateDescription(viewsets.ViewSet):
    permission_classes = [IsAuthenticated]

    @action(detail=False, methods=['get'],)
    def desc(self, request):
        name = self.request.query_params.get('name', '')
        # un url encode the name
        name = name.replace('%20', ' ')
        print(name)
        url = 'https://en.wikipedia.org/w/api.php?origin=*&action=query&prop=extracts&exintro&explaintext&format=json&titles=%s' % name
        response = requests.get(url)
        data = response.json()
        data = response.json()
        page_id = next(iter(data["query"]["pages"]))
        extract = data["query"]["pages"][page_id]
        if extract.get('extract') is None:
            return Response({"error": "No description found"}, status=400)
        return Response(extract)
    @action(detail=False, methods=['get'],)
    def img(self, request):
        name = self.request.query_params.get('name', '')
        # un url encode the name
        name = name.replace('%20', ' ')
        url = 'https://en.wikipedia.org/w/api.php?origin=*&action=query&prop=pageimages&format=json&piprop=original&titles=%s' % name
        response = requests.get(url)
        data = response.json()
        page_id = next(iter(data["query"]["pages"]))
        extract = data["query"]["pages"][page_id]
        if extract.get('original') is None:
            return Response({"error": "No image found"}, status=400)
        return Response(extract["original"])


class ActivityTypesView(viewsets.ViewSet):
    permission_classes = [IsAuthenticated]

    @action(detail=False, methods=['get'])
    def types(self, request):
        """
        Retrieve a list of distinct activity types for adventures associated with the current user.

        Args:
            request (HttpRequest): The HTTP request object.

        Returns:
            Response: A response containing a list of distinct activity types.
        """
        types = Adventure.objects.filter(user_id=request.user.id).values_list('activity_types', flat=True).distinct()

        allTypes = []

        for i in types:
            if not i:
                continue
            for x in i:
                if x and x not in allTypes:
                    allTypes.append(x)

        return Response(allTypes)
    
class CategoryViewSet(viewsets.ModelViewSet):
    queryset = Category.objects.all()
    serializer_class = CategorySerializer
    permission_classes = [IsAuthenticated]

    def get_queryset(self):
        return Category.objects.filter(user_id=self.request.user)

    @action(detail=False, methods=['get'])
    def categories(self, request):
        """
        Retrieve a list of distinct categories for adventures associated with the current user.
        """
        categories = self.get_queryset().distinct()
        serializer = self.get_serializer(categories, many=True)
        return Response(serializer.data)
    
    def destroy(self, request, *args, **kwargs):
        instance = self.get_object()
        if instance.user_id != request.user:
            return Response({"error": "User does not own this category"}, status
            =400)
        
        if instance.name == 'general':
            return Response({"error": "Cannot delete the general category"}, status=400)
        
        # set any adventures with this category to a default category called general before deleting the category, if general does not exist create it for the user
        general_category = Category.objects.filter(user_id=request.user, name='general').first()

        if not general_category:
            general_category = Category.objects.create(user_id=request.user, name='general', icon='🌍', display_name='General')
        
        Adventure.objects.filter(category=instance).update(category=general_category)

        return super().destroy(request, *args, **kwargs)
    

class TransportationViewSet(viewsets.ModelViewSet):
    queryset = Transportation.objects.all()
    serializer_class = TransportationSerializer
    permission_classes = [IsOwnerOrSharedWithFullAccess, IsPublicOrOwnerOrSharedWithFullAccess]
    filterset_fields = ['type', 'is_public', 'collection']

    # return error message if user is not authenticated on the root endpoint
    def list(self, request, *args, **kwargs):
        # Prevent listing all adventures
        return Response({"detail": "Listing all transportations is not allowed."},
                        status=status.HTTP_403_FORBIDDEN)
    
    @action(detail=False, methods=['get'])
    def all(self, request):
        if not request.user.is_authenticated:
            return Response({"error": "User is not authenticated"}, status=400)
        queryset = Transportation.objects.filter(
            Q(user_id=request.user.id)
        )
        serializer = self.get_serializer(queryset, many=True)
        return Response(serializer.data)
    

    def get_queryset(self):
        # if the user is not authenticated return only public transportations for  retrieve action
        if not self.request.user.is_authenticated:
            if self.action == 'retrieve':
                return Transportation.objects.filter(is_public=True).distinct().order_by('-updated_at')
            return Transportation.objects.none()

        
        if self.action == 'retrieve':
            # For individual adventure retrieval, include public adventures
            return Transportation.objects.filter(
                Q(is_public=True) | Q(user_id=self.request.user.id) | Q(collection__shared_with=self.request.user)
            ).distinct().order_by('-updated_at')
        else:
            # For other actions, include user's own adventures and shared adventures
            return Transportation.objects.filter(
                Q(user_id=self.request.user.id) | Q(collection__shared_with=self.request.user)
            ).distinct().order_by('-updated_at')

    def partial_update(self, request, *args, **kwargs):
        # Retrieve the current object
        instance = self.get_object()
        
        # Partially update the instance with the request data
        serializer = self.get_serializer(instance, data=request.data, partial=True)
        serializer.is_valid(raise_exception=True)

        # Retrieve the collection from the validated data
        new_collection = serializer.validated_data.get('collection')

        user = request.user
        print(new_collection)

        if new_collection is not None and new_collection!=instance.collection:
            # Check if the user is the owner of the new collection
            if new_collection.user_id != user or instance.user_id != user:
                raise PermissionDenied("You do not have permission to use this collection.")
        elif new_collection is None:
            # Handle the case where the user is trying to set the collection to None
            if instance.collection is not None and instance.collection.user_id != user:
                raise PermissionDenied("You cannot remove the collection as you are not the owner.")
        
        # Perform the update
        self.perform_update(serializer)

        # Return the updated instance
        return Response(serializer.data)
    
    def partial_update(self, request, *args, **kwargs):
        # Retrieve the current object
        instance = self.get_object()
        
        # Partially update the instance with the request data
        serializer = self.get_serializer(instance, data=request.data, partial=True)
        serializer.is_valid(raise_exception=True)

        # Retrieve the collection from the validated data
        new_collection = serializer.validated_data.get('collection')

        user = request.user
        print(new_collection)

        if new_collection is not None and new_collection!=instance.collection:
            # Check if the user is the owner of the new collection
            if new_collection.user_id != user or instance.user_id != user:
                raise PermissionDenied("You do not have permission to use this collection.")
        elif new_collection is None:
            # Handle the case where the user is trying to set the collection to None
            if instance.collection is not None and instance.collection.user_id != user:
                raise PermissionDenied("You cannot remove the collection as you are not the owner.")
        
        # Perform the update
        self.perform_update(serializer)

        # Return the updated instance
        return Response(serializer.data)

    def perform_update(self, serializer):
        serializer.save()
    
    # when creating an adventure, make sure the user is the owner of the collection or shared with the collection
    def perform_create(self, serializer):
        # Retrieve the collection from the validated data
        collection = serializer.validated_data.get('collection')

        # Check if a collection is provided
        if collection:
            user = self.request.user
            # Check if the user is the owner or is in the shared_with list
            if collection.user_id != user and not collection.shared_with.filter(id=user.id).exists():
                # Return an error response if the user does not have permission
                raise PermissionDenied("You do not have permission to use this collection.")
            # if collection the owner of the adventure is the owner of the collection
            serializer.save(user_id=collection.user_id)
            return

        # Save the adventure with the current user as the owner
        serializer.save(user_id=self.request.user)

class NoteViewSet(viewsets.ModelViewSet):
    queryset = Note.objects.all()
    serializer_class = NoteSerializer
    permission_classes = [IsOwnerOrSharedWithFullAccess, IsPublicOrOwnerOrSharedWithFullAccess]
    filterset_fields = ['is_public', 'collection']

    # return error message if user is not authenticated on the root endpoint
    def list(self, request, *args, **kwargs):
        # Prevent listing all adventures
        return Response({"detail": "Listing all notes is not allowed."},
                        status=status.HTTP_403_FORBIDDEN)
    
    @action(detail=False, methods=['get'])
    def all(self, request):
        if not request.user.is_authenticated:
            return Response({"error": "User is not authenticated"}, status=400)
        queryset = Note.objects.filter(
            Q(user_id=request.user.id)
        )
        serializer = self.get_serializer(queryset, many=True)
        return Response(serializer.data)
    

    def get_queryset(self):
        # if the user is not authenticated return only public transportations for  retrieve action
        if not self.request.user.is_authenticated:
            if self.action == 'retrieve':
                return Note.objects.filter(is_public=True).distinct().order_by('-updated_at')
            return Note.objects.none()

        
        if self.action == 'retrieve':
            # For individual adventure retrieval, include public adventures
            return Note.objects.filter(
                Q(is_public=True) | Q(user_id=self.request.user.id) | Q(collection__shared_with=self.request.user)
            ).distinct().order_by('-updated_at')
        else:
            # For other actions, include user's own adventures and shared adventures
            return Note.objects.filter(
                Q(user_id=self.request.user.id) | Q(collection__shared_with=self.request.user)
            ).distinct().order_by('-updated_at')

    def partial_update(self, request, *args, **kwargs):
        # Retrieve the current object
        instance = self.get_object()
        
        # Partially update the instance with the request data
        serializer = self.get_serializer(instance, data=request.data, partial=True)
        serializer.is_valid(raise_exception=True)

        # Retrieve the collection from the validated data
        new_collection = serializer.validated_data.get('collection')

        user = request.user
        print(new_collection)

        if new_collection is not None and new_collection!=instance.collection:
            # Check if the user is the owner of the new collection
            if new_collection.user_id != user or instance.user_id != user:
                raise PermissionDenied("You do not have permission to use this collection.")
        elif new_collection is None:
            # Handle the case where the user is trying to set the collection to None
            if instance.collection is not None and instance.collection.user_id != user:
                raise PermissionDenied("You cannot remove the collection as you are not the owner.")
        
        # Perform the update
        self.perform_update(serializer)

        # Return the updated instance
        return Response(serializer.data)
    
    def partial_update(self, request, *args, **kwargs):
        # Retrieve the current object
        instance = self.get_object()
        
        # Partially update the instance with the request data
        serializer = self.get_serializer(instance, data=request.data, partial=True)
        serializer.is_valid(raise_exception=True)

        # Retrieve the collection from the validated data
        new_collection = serializer.validated_data.get('collection')

        user = request.user
        print(new_collection)

        if new_collection is not None and new_collection!=instance.collection:
            # Check if the user is the owner of the new collection
            if new_collection.user_id != user or instance.user_id != user:
                raise PermissionDenied("You do not have permission to use this collection.")
        elif new_collection is None:
            # Handle the case where the user is trying to set the collection to None
            if instance.collection is not None and instance.collection.user_id != user:
                raise PermissionDenied("You cannot remove the collection as you are not the owner.")
        
        # Perform the update
        self.perform_update(serializer)

        # Return the updated instance
        return Response(serializer.data)

    def perform_update(self, serializer):
        serializer.save()
    
    # when creating an adventure, make sure the user is the owner of the collection or shared with the collection
    def perform_create(self, serializer):
        # Retrieve the collection from the validated data
        collection = serializer.validated_data.get('collection')

        # Check if a collection is provided
        if collection:
            user = self.request.user
            # Check if the user is the owner or is in the shared_with list
            if collection.user_id != user and not collection.shared_with.filter(id=user.id).exists():
                # Return an error response if the user does not have permission
                raise PermissionDenied("You do not have permission to use this collection.")
            # if collection the owner of the adventure is the owner of the collection
            serializer.save(user_id=collection.user_id)
            return

        # Save the adventure with the current user as the owner
        serializer.save(user_id=self.request.user)

class ChecklistViewSet(viewsets.ModelViewSet):
    queryset = Checklist.objects.all()
    serializer_class = ChecklistSerializer
    permission_classes = [IsOwnerOrSharedWithFullAccess, IsPublicOrOwnerOrSharedWithFullAccess]
    filterset_fields = ['is_public', 'collection']

    # return error message if user is not authenticated on the root endpoint
    def list(self, request, *args, **kwargs):
        # Prevent listing all adventures
        return Response({"detail": "Listing all checklists is not allowed."},
                        status=status.HTTP_403_FORBIDDEN)
    
    @action(detail=False, methods=['get'])
    def all(self, request):
        if not request.user.is_authenticated:
            return Response({"error": "User is not authenticated"}, status=400)
        queryset = Checklist.objects.filter(
            Q(user_id=request.user.id)
        )
        serializer = self.get_serializer(queryset, many=True)
        return Response(serializer.data)
    

    def get_queryset(self):
        # if the user is not authenticated return only public transportations for  retrieve action
        if not self.request.user.is_authenticated:
            if self.action == 'retrieve':
                return Checklist.objects.filter(is_public=True).distinct().order_by('-updated_at')
            return Checklist.objects.none()

        
        if self.action == 'retrieve':
            # For individual adventure retrieval, include public adventures
            return Checklist.objects.filter(
                Q(is_public=True) | Q(user_id=self.request.user.id) | Q(collection__shared_with=self.request.user)
            ).distinct().order_by('-updated_at')
        else:
            # For other actions, include user's own adventures and shared adventures
            return Checklist.objects.filter(
                Q(user_id=self.request.user.id) | Q(collection__shared_with=self.request.user)
            ).distinct().order_by('-updated_at')

    def partial_update(self, request, *args, **kwargs):
        # Retrieve the current object
        instance = self.get_object()
        
        # Partially update the instance with the request data
        serializer = self.get_serializer(instance, data=request.data, partial=True)
        serializer.is_valid(raise_exception=True)

        # Retrieve the collection from the validated data
        new_collection = serializer.validated_data.get('collection')

        user = request.user
        print(new_collection)

        if new_collection is not None and new_collection!=instance.collection:
            # Check if the user is the owner of the new collection
            if new_collection.user_id != user or instance.user_id != user:
                raise PermissionDenied("You do not have permission to use this collection.")
        elif new_collection is None:
            # Handle the case where the user is trying to set the collection to None
            if instance.collection is not None and instance.collection.user_id != user:
                raise PermissionDenied("You cannot remove the collection as you are not the owner.")
        
        # Perform the update
        self.perform_update(serializer)

        # Return the updated instance
        return Response(serializer.data)
    
    def partial_update(self, request, *args, **kwargs):
        # Retrieve the current object
        instance = self.get_object()
        
        # Partially update the instance with the request data
        serializer = self.get_serializer(instance, data=request.data, partial=True)
        serializer.is_valid(raise_exception=True)

        # Retrieve the collection from the validated data
        new_collection = serializer.validated_data.get('collection')

        user = request.user
        print(new_collection)

        if new_collection is not None and new_collection!=instance.collection:
            # Check if the user is the owner of the new collection
            if new_collection.user_id != user or instance.user_id != user:
                raise PermissionDenied("You do not have permission to use this collection.")
        elif new_collection is None:
            # Handle the case where the user is trying to set the collection to None
            if instance.collection is not None and instance.collection.user_id != user:
                raise PermissionDenied("You cannot remove the collection as you are not the owner.")
        
        # Perform the update
        self.perform_update(serializer)

        # Return the updated instance
        return Response(serializer.data)

    def perform_update(self, serializer):
        serializer.save()
    
    # when creating an adventure, make sure the user is the owner of the collection or shared with the collection
    def perform_create(self, serializer):
        # Retrieve the collection from the validated data
        collection = serializer.validated_data.get('collection')

        # Check if a collection is provided
        if collection:
            user = self.request.user
            # Check if the user is the owner or is in the shared_with list
            if collection.user_id != user and not collection.shared_with.filter(id=user.id).exists():
                # Return an error response if the user does not have permission
                raise PermissionDenied("You do not have permission to use this collection.")
            # if collection the owner of the adventure is the owner of the collection
            serializer.save(user_id=collection.user_id)
            return

        # Save the adventure with the current user as the owner
        serializer.save(user_id=self.request.user)

class AdventureImageViewSet(viewsets.ModelViewSet):
    serializer_class = AdventureImageSerializer
    permission_classes = [IsAuthenticated]

    def dispatch(self, request, *args, **kwargs):
        print(f"Method: {request.method}")
        return super().dispatch(request, *args, **kwargs)

    @action(detail=True, methods=['post'])
    def image_delete(self, request, *args, **kwargs):
        return self.destroy(request, *args, **kwargs)


    def create(self, request, *args, **kwargs):
        if not request.user.is_authenticated:
            return Response({"error": "User is not authenticated"}, status=status.HTTP_401_UNAUTHORIZED)
        adventure_id = request.data.get('adventure')
        try:
            adventure = Adventure.objects.get(id=adventure_id)
        except Adventure.DoesNotExist:
            return Response({"error": "Adventure not found"}, status=status.HTTP_404_NOT_FOUND)
        
        if adventure.user_id != request.user:
            # Check if the adventure has a collection
            if adventure.collection:
                # Check if the user is in the collection's shared_with list
                if not adventure.collection.shared_with.filter(id=request.user.id).exists():
                    return Response({"error": "User does not have permission to access this adventure"}, status=status.HTTP_403_FORBIDDEN)
            else:
                return Response({"error": "User does not own this adventure"}, status=status.HTTP_403_FORBIDDEN)
        
        return super().create(request, *args, **kwargs)
    
    def update(self, request, *args, **kwargs):
        if not request.user.is_authenticated:
            return Response({"error": "User is not authenticated"}, status=status.HTTP_401_UNAUTHORIZED)
        
        adventure_id = request.data.get('adventure')
        try:
            adventure = Adventure.objects.get(id=adventure_id)
        except Adventure.DoesNotExist:
            return Response({"error": "Adventure not found"}, status=status.HTTP_404_NOT_FOUND)
        
        if adventure.user_id != request.user:
            return Response({"error": "User does not own this adventure"}, status=status.HTTP_403_FORBIDDEN)
        
        return super().update(request, *args, **kwargs)
    
    def perform_destroy(self, instance):
        print("perform_destroy")
        return super().perform_destroy(instance)

    def destroy(self, request, *args, **kwargs):
        print("destroy")
        if not request.user.is_authenticated:
            return Response({"error": "User is not authenticated"}, status=status.HTTP_401_UNAUTHORIZED)
        
        instance = self.get_object()
        adventure = instance.adventure
        if adventure.user_id != request.user:
            return Response({"error": "User does not own this adventure"}, status=status.HTTP_403_FORBIDDEN)
        
        return super().destroy(request, *args, **kwargs)
    
    def partial_update(self, request, *args, **kwargs):
        if not request.user.is_authenticated:
            return Response({"error": "User is not authenticated"}, status=status.HTTP_401_UNAUTHORIZED)
        
        instance = self.get_object()
        adventure = instance.adventure
        if adventure.user_id != request.user:
            return Response({"error": "User does not own this adventure"}, status=status.HTTP_403_FORBIDDEN)
        
        return super().partial_update(request, *args, **kwargs)
    
    @action(detail=False, methods=['GET'], url_path='(?P<adventure_id>[0-9a-f-]+)')
    def adventure_images(self, request, adventure_id=None, *args, **kwargs):
        if not request.user.is_authenticated:
            return Response({"error": "User is not authenticated"}, status=status.HTTP_401_UNAUTHORIZED)
        
        try:
            adventure_uuid = uuid.UUID(adventure_id)
        except ValueError:
            return Response({"error": "Invalid adventure ID"}, status=status.HTTP_400_BAD_REQUEST)
        
        queryset = AdventureImage.objects.filter(
            Q(adventure__id=adventure_uuid) & Q(user_id=request.user)
        )
        
        serializer = self.get_serializer(queryset, many=True, context={'request': request})
        return Response(serializer.data)

    def get_queryset(self):
        return AdventureImage.objects.filter(user_id=self.request.user)

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

class ReverseGeocodeViewSet(viewsets.ViewSet):
    permission_classes = [IsAuthenticated]

    def extractIsoCode(self, data):
        """
        Extract the ISO code from the response data.
        Returns a dictionary containing the region name, country name, and ISO code if found.
        """
        iso_code = None
        town = None
        city = None
        county = None
        display_name = None
        country_code = None
        if 'address' in data.keys():
            keys = data['address'].keys()
            for key in keys:
                if key.find("ISO") != -1:
                    iso_code = data['address'][key]
            if 'town' in keys:
                town = data['address']['town']
            if 'county' in keys:
                county = data['address']['county']
            if 'city' in keys:
                city = data['address']['city']
        if not iso_code:
            return {"error": "No region found"}
        region = Region.objects.filter(id=iso_code).first()
        visited_region = VisitedRegion.objects.filter(region=region, user_id=self.request.user).first()
        is_visited = False
        country_code = iso_code[:2]
        
        if region:
            if city:
                display_name = f"{city}, {region.name}, {country_code}"
            elif town:
                display_name = f"{town}, {region.name}, {country_code}"
            elif county:
                display_name = f"{county}, {region.name}, {country_code}"

        if visited_region:
            is_visited = True
        if region:
            return {"id": iso_code, "region": region.name, "country": region.country.name, "is_visited": is_visited, "display_name": display_name}
        return {"error": "No region found"}

    @action(detail=False, methods=['get'])
    def reverse_geocode(self, request):
        lat = request.query_params.get('lat', '')
        lon = request.query_params.get('lon', '')
        url = f"https://nominatim.openstreetmap.org/reverse?format=jsonv2&lat={lat}&lon={lon}"
        headers = {'User-Agent': 'AdventureLog Server'}
        response = requests.get(url, headers=headers)
        try:
            data = response.json()
        except requests.exceptions.JSONDecodeError:
            return Response({"error": "Invalid response from geocoding service"}, status=400)
        return Response(self.extractIsoCode(data))

    @action(detail=False, methods=['post'])
    def mark_visited_region(self, request):
        # searches through all of the users adventures, if the serialized data is_visited, is true, runs reverse geocode on the adventures and if a region is found, marks it as visited. Use the extractIsoCode function to get the region
        new_region_count = 0
        new_regions = {}
        adventures = Adventure.objects.filter(user_id=self.request.user)
        serializer = AdventureSerializer(adventures, many=True)
        for adventure, serialized_adventure in zip(adventures, serializer.data):
            if serialized_adventure['is_visited'] == True:
                lat = adventure.latitude
                lon = adventure.longitude
                url = f"https://nominatim.openstreetmap.org/reverse?format=jsonv2&lat={lat}&lon={lon}"
                headers = {'User-Agent': 'AdventureLog Server'}
                response = requests.get(url, headers=headers)
                try:
                    data = response.json()
                except requests.exceptions.JSONDecodeError:
                    return Response({"error": "Invalid response from geocoding service"}, status=400)
                region = self.extractIsoCode(data)
                if 'error' not in region:
                    region = Region.objects.filter(id=region['id']).first()
                    visited_region = VisitedRegion.objects.filter(region=region, user_id=self.request.user).first()
                    if not visited_region:
                        visited_region = VisitedRegion(region=region, user_id=self.request.user)
                        visited_region.save()
                        new_region_count += 1
                        new_regions[region.id] = region.name
        return Response({"new_regions": new_region_count, "regions": new_regions})


from django.http import HttpResponse
from rest_framework import viewsets
from rest_framework.decorators import action
from rest_framework.permissions import IsAuthenticated
from icalendar import Calendar, Event, vText, vCalAddress
from datetime import datetime, timedelta

class IcsCalendarGeneratorViewSet(viewsets.ViewSet):
    permission_classes = [IsAuthenticated]

    @action(detail=False, methods=['get'])
    def generate(self, request):
        adventures = Adventure.objects.filter(user_id=request.user)
        serializer = AdventureSerializer(adventures, many=True)
        user = request.user
        name = f"{user.first_name} {user.last_name}"
        print(serializer.data)
        
        cal = Calendar()
        cal.add('prodid', '-//My Adventure Calendar//example.com//')
        cal.add('version', '2.0')

        for adventure in serializer.data:
            if adventure['visits']:
                for visit in adventure['visits']:
                    event = Event()
                    event.add('summary', adventure['name'])
                    start_date = datetime.strptime(visit['start_date'], '%Y-%m-%d').date()
                    end_date = datetime.strptime(visit['end_date'], '%Y-%m-%d').date() + timedelta(days=1) if visit['end_date'] else start_date + timedelta(days=1)
                    event.add('dtstart', start_date)
                    event.add('dtend', end_date)
                    event.add('dtstamp', datetime.now())
                    event.add('transp', 'TRANSPARENT')
                    event.add('class', 'PUBLIC')
                    event.add('created', datetime.now())
                    event.add('last-modified', datetime.now())
                    event.add('description', adventure['description'])
                    if adventure.get('location'):
                        event.add('location', adventure['location'])
                    if adventure.get('link'):
                        event.add('url', adventure['link'])
                    
                    organizer = vCalAddress(f'MAILTO:{user.email}')
                    organizer.params['cn'] = vText(name)
                    event.add('organizer', organizer)
                
                    cal.add_component(event)
        
        response = HttpResponse(cal.to_ical(), content_type='text/calendar')
        response['Content-Disposition'] = 'attachment; filename=adventures.ics'
        return response