Add download adventures as ICS calendar

backend/server/adventures/views.py

@@ -17,6 +17,9 @@ 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()
 
@@ -1203,4 +1206,57 @@ class ReverseGeocodeViewSet(viewsets.ViewSet):
                         visited_region.save()
                         new_region_count += 1
                         new_regions[region.id] = region.name
-        return Response({"new_regions": new_region_count, "regions": new_regions})
+        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