from rest_framework import viewsets from rest_framework.decorators import action from rest_framework.permissions import IsAuthenticated from rest_framework.response import Response from django.conf import settings import requests from geopy.distance import geodesic import time class RecommendationsViewSet(viewsets.ViewSet): permission_classes = [IsAuthenticated] BASE_URL = "https://overpass-api.de/api/interpreter" HEADERS = {'User-Agent': 'AdventureLog Server'} def parse_google_places(self, places, origin): adventures = [] for place in places: location = place.get('geometry', {}).get('location', {}) types = place.get('types', []) formatted_address = place.get("vicinity") or place.get("formatted_address") or place.get("name") lat = location.get('lat') lon = location.get('lng') if not place.get("name") or not lat or not lon: continue distance_km = geodesic(origin, (lat, lon)).km adventure = { "id": place.get('place_id'), "type": 'place', "name": place.get('name', ''), "description": place.get('business_status', None), "latitude": lat, "longitude": lon, "address": formatted_address, "tag": types[0] if types else None, "distance_km": round(distance_km, 2), # Optional: include in response } adventures.append(adventure) # Sort by distance ascending adventures.sort(key=lambda x: x["distance_km"]) return adventures def parse_overpass_response(self, data, request): nodes = data.get('elements', []) adventures = [] all = request.query_params.get('all', False) origin = None try: origin = ( float(request.query_params.get('lat')), float(request.query_params.get('lon')) ) except: pass for node in nodes: if node.get('type') not in ['node', 'way', 'relation']: continue tags = node.get('tags', {}) lat = node.get('lat') lon = node.get('lon') name = tags.get('name', tags.get('official_name', '')) if not name or lat is None or lon is None: if not all: continue # Flatten address address_parts = [tags.get(f'addr:{k}') for k in ['housenumber', 'street', 'suburb', 'city', 'state', 'postcode', 'country']] formatted_address = ", ".join(filter(None, address_parts)) or name # Calculate distance if possible distance_km = None if origin: distance_km = round(geodesic(origin, (lat, lon)).km, 2) # Unified format adventure = { "id": f"osm:{node.get('id')}", "type": "place", "name": name, "description": tags.get('description'), "latitude": lat, "longitude": lon, "address": formatted_address, "tag": next((tags.get(key) for key in ['leisure', 'tourism', 'natural', 'historic', 'amenity'] if key in tags), None), "distance_km": distance_km, "powered_by": "osm" } adventures.append(adventure) # Sort by distance if available if origin: adventures.sort(key=lambda x: x.get("distance_km") or float("inf")) return adventures def query_overpass(self, lat, lon, radius, category, request): if category == 'tourism': query = f""" [out:json]; ( node(around:{radius},{lat},{lon})["tourism"]; node(around:{radius},{lat},{lon})["leisure"]; node(around:{radius},{lat},{lon})["historic"]; node(around:{radius},{lat},{lon})["sport"]; node(around:{radius},{lat},{lon})["natural"]; node(around:{radius},{lat},{lon})["attraction"]; node(around:{radius},{lat},{lon})["museum"]; node(around:{radius},{lat},{lon})["zoo"]; node(around:{radius},{lat},{lon})["aquarium"]; ); out; """ elif category == 'lodging': query = f""" [out:json]; ( node(around:{radius},{lat},{lon})["tourism"="hotel"]; node(around:{radius},{lat},{lon})["tourism"="motel"]; node(around:{radius},{lat},{lon})["tourism"="guest_house"]; node(around:{radius},{lat},{lon})["tourism"="hostel"]; node(around:{radius},{lat},{lon})["tourism"="camp_site"]; node(around:{radius},{lat},{lon})["tourism"="caravan_site"]; node(around:{radius},{lat},{lon})["tourism"="chalet"]; node(around:{radius},{lat},{lon})["tourism"="alpine_hut"]; node(around:{radius},{lat},{lon})["tourism"="apartment"]; ); out; """ elif category == 'food': query = f""" [out:json]; ( node(around:{radius},{lat},{lon})["amenity"="restaurant"]; node(around:{radius},{lat},{lon})["amenity"="cafe"]; node(around:{radius},{lat},{lon})["amenity"="fast_food"]; node(around:{radius},{lat},{lon})["amenity"="pub"]; node(around:{radius},{lat},{lon})["amenity"="bar"]; node(around:{radius},{lat},{lon})["amenity"="food_court"]; node(around:{radius},{lat},{lon})["amenity"="ice_cream"]; node(around:{radius},{lat},{lon})["amenity"="bakery"]; node(around:{radius},{lat},{lon})["amenity"="confectionery"]; ); out; """ else: return Response({"error": "Invalid category."}, status=400) overpass_url = f"{self.BASE_URL}?data={query}" try: response = requests.get(overpass_url, headers=self.HEADERS) response.raise_for_status() data = response.json() except Exception as e: print("Overpass API error:", e) return Response({"error": "Failed to retrieve data from Overpass API."}, status=500) adventures = self.parse_overpass_response(data, request) return Response(adventures) @action(detail=False, methods=['get']) def query(self, request): lat = request.query_params.get('lat') lon = request.query_params.get('lon') radius = request.query_params.get('radius', '1000') category = request.query_params.get('category', 'all') if not lat or not lon: return Response({"error": "Latitude and longitude parameters are required."}, status=400) valid_categories = { 'lodging': 'lodging', 'food': 'restaurant', 'tourism': 'tourist_attraction', } if category not in valid_categories: return Response({"error": f"Invalid category. Valid categories: {', '.join(valid_categories)}"}, status=400) api_key = getattr(settings, 'GOOGLE_MAPS_API_KEY', None) # Fallback to Overpass if no API key configured if not api_key: return self.query_overpass(lat, lon, radius, category, request) base_url = "https://maps.googleapis.com/maps/api/place/nearbysearch/json" params = { 'location': f"{lat},{lon}", 'radius': radius, 'type': valid_categories[category], 'key': api_key } all_places = [] page_token = None try: for _ in range(3): # Max 3 pages if page_token: params['pagetoken'] = page_token time.sleep(2.5) response = requests.get(base_url, params=params) response.raise_for_status() data = response.json() all_places.extend(data.get('results', [])) page_token = data.get('next_page_token') if not page_token: break origin = (float(lat), float(lon)) adventures = self.parse_google_places(all_places, origin) return Response(adventures) except Exception as e: print("Google Places API failed, falling back to Overpass:", e) return self.query_overpass(lat, lon, radius, category, request)