Add features to see all reachable cities

app.py

@@ -18,13 +18,11 @@ from tqdm import tqdm
 
 import config
 
-
 app = Flask(__name__)
 
 cli = AppGroup('tgvmax', help="Manage the TGVMax dataset.")
 app.cli.add_command(cli)
 
-
 app.config |= config.FLASK_CONFIG
 
 db = SQLAlchemy(app)
@@ -78,7 +76,8 @@ def update_dataset():
         modified_date = datetime.fromisoformat(info['dateModified'])
 
         utc = timezone('UTC')
-        last_modified = datetime.utcfromtimestamp(os.path.getmtime('tgvmax.csv')).replace(tzinfo=utc) if os.path.isfile('tgvmax.csv') else datetime(1, 1, 1, tzinfo=utc)
+        last_modified = datetime.utcfromtimestamp(os.path.getmtime('tgvmax.csv')).replace(tzinfo=utc) if os.path.isfile(
+            'tgvmax.csv') else datetime(1, 1, 1, tzinfo=utc)
 
         if last_modified < modified_date:
             print("Updating tgvmax.csv…")
@@ -156,7 +155,7 @@ def parse_trains(flush: bool = False):
     db.session.commit()
 
 
-def find_routes(day: date, origin: str, destination: str):
+def find_routes(day: date, origin: str, destination: str | None):
     trains = db.session.query(Train).filter_by(day=day, tgvmax=True).all()
 
     trains.sort(key=lambda train: train.dep)
@@ -164,9 +163,9 @@ def find_routes(day: date, origin: str, destination: str):
     # For better results later, fetch all trains from the origin or to the destination
     # This is not exhaustive, but can be a good approximation
     queue_routes(day, origin=origin)
+    if destination:
         queue_routes(day, destination=destination)
 
-    explore = []
     per_arr_explore = {}
     valid_routes = []
 
@@ -180,7 +179,6 @@ def find_routes(day: date, origin: str, destination: str):
                 # We hope that we have a direct train
                 valid_routes.append(it)
             else:
-                explore.append(it)
                 per_arr_explore.setdefault(train.dest, [])
                 per_arr_explore[train.dest].append(it)
             continue
@@ -201,11 +199,10 @@ def find_routes(day: date, origin: str, destination: str):
                     # Goal is achieved
                     valid_routes.append(new_it)
                 else:
-                    explore.append(new_it)
                     per_arr_explore.setdefault(train.dest, [])
                     per_arr_explore[train.dest].append(new_it)
 
-    return valid_routes
+    return {destination: valid_routes} if destination else per_arr_explore
 
 
 def queue_route(day: date | datetime, origin: str, destination: str, verbose: bool = False):
@@ -345,8 +342,13 @@ def get_routes(day: date | str, origin: str, destination: str):
     if isinstance(day, str):
         day = date.fromisoformat(day)
 
+    if destination == 'undefined':
+        destination = None
+
     routes = find_routes(day, origin, destination)
-    return [
+
+    return {
+            city: [
                 [{
                     'origin': tr.orig,
                     'origin_iata': tr.orig_iata,
@@ -356,8 +358,9 @@ def get_routes(day: date | str, origin: str, destination: str):
                     'arrival': tr.arr.isoformat(),
                     'number': tr.number,
                     'free_seats': tr.remaining_seats,
-          } for tr in route] for route in routes
-    ]
+                } for tr in route] for route in city_routes
+            ] for city, city_routes in routes.items()
+        }
 
 
 if __name__ == '__main__':

templates/index.html

@@ -78,27 +78,34 @@
     let result_elem = document.getElementById('result')
     document.getElementById('form').addEventListener('submit', () => {
         result_elem.innerHTML = 'Chargement…'
-        fetch('/api/routes/' + day_elem.value + '/' + origin_elem.value + '/' + destination_elem.value + '/')
+        fetch('/api/routes/' + day_elem.value + '/' + origin_elem.value + '/' + (destination_elem.value || 'undefined') + '/')
             .then(resp => resp.json())
             .then(routes => {
-                console.log(routes)
                 result_elem.innerHTML = ''
+                let city_elem = document.createElement('ul')
+                result_elem.appendChild(city_elem)
+
+                for (let city in routes) {
+                    let city_routes = routes[city]
+
+                    let city_name_elem = document.createElement('li')
+                    city_name_elem.textContent = city + " :"
+                    city_elem.appendChild(city_name_elem)
+
                     let routes_elem = document.createElement('ul')
-                result_elem.appendChild(routes_elem)
-                for (let route in routes) {
-                    route = routes[route]
-                    console.log(route)
+                    city_elem.appendChild(routes_elem)
+
+                    for (let route of city_routes) {
                         let route_elem = document.createElement('li')
                         routes_elem.appendChild(route_elem)
 
                         let text = route[0].origin
-                    for (let train in route) {
-                        train = route[train]
-                        console.log(train)
+                        for (let train of route) {
                             text += " (" + train.departure + ") --> (" + train.arrival + ") " + train.destination + ", "
                         }
                         route_elem.textContent = text
                     }
+                }
             })
     })
 </script>