base structs as agreed upon

backend/src/structs/landmarks.py

@@ -1,20 +1,30 @@
 from typing import Optional
-from pydantic import BaseModel
+from pydantic import BaseModel, Field
 
 from .landmarktype import LandmarkType
 
-
+from uuid import uuid4
 
 # Output to frontend
 class Landmark(BaseModel) :
+    # Unique ID of a given landmark
+    uuid: str = Field(default_factory=uuid4)                    # TODO implement this ASAP
+    
+    # Properties of the landmark
     name : str
     type: LandmarkType      # De facto mapping depending on how the query was executed with overpass. Should still EXACTLY correspond to the preferences
     location : tuple
     osm_type : str
     osm_id : int
     attractiveness : int
-    must_do : bool
     n_tags : int
-    time_to_reach : Optional[int] = 0
-
-
+    image_url : Optional[str] = None                            # TODO future
+    description : Optional[str] = None                          # TODO future
+    duration : Optional[int] = 0                                # TODO future
+    
+    # Additional properties depending on specific tour
+    must_do : bool
+    is_secondary : Optional[bool] = False                       # TODO future   
+    
+    time_to_reach_next : Optional[int] = 0                      # TODO fix this in existing code
+    next_uuid : Optional[str] = None                            # TODO implement this ASAP