added basic connection between the files, fixed small issues. some parts were achieved using ai.

station_monitor.py

@@ -7,6 +7,7 @@ Prompt_toolkit (https://github.com/prompt-toolkit/python-prompt-toolkit) will be
 The application will provide routing information and station departures/arrivals.
 """
 
+import backend
 from prompt_toolkit import Application
 from prompt_toolkit.buffer import Buffer
 from prompt_toolkit.layout.layout import Layout
@@ -17,59 +18,72 @@ import threading
 import time
 
 
-keyB=KeyBindings()
-inputBuffer=Buffer()
-resultBuffer=Buffer()
-stop_event=threading.Event()
-app_state="MONITOR"
+def run_station_monitor(hafas: backend.HafasClient | None = None):
+    """Run the station monitor TUI.
 
-inputBuffer.text = "Monitor\n\nHaltestelle eingeben: "
-inputBuffer.cursor_position = len(inputBuffer.text)
+    Parameters:
+    - hafas: optional shared HafasClient instance. If omitted, a new one is
+      created. Prefer passing the shared client from `main.py`.
 
-resultBuffer.text = "Ausgabe: "
+    Note: Some parts of this monitor are incomplete; see TODO markers.
+    """
+    if hafas is None:
+        hafas = backend.HafasClient()
 
+    keyB = KeyBindings()
+    inputBuffer = Buffer()
+    resultBuffer = Buffer()
+    stop_event = threading.Event()
+    app_state = "MONITOR"
 
-root_container= HSplit(children=[
-    VSplit(children=[
-        Window(content=BufferControl(buffer=inputBuffer, focusable=True)),
-        
-        Window(width=1, char='│', style="fg:#9D1D75"),
-        Window(content=BufferControl(buffer=resultBuffer, focusable=True)),
-    ]),
-    Window(height=1, char='-', style="bg:#9D1D75 fg:#FFFFFF"),
-])
+    inputBuffer.text = "Haltestelle eingeben: "
+    inputBuffer.cursor_position = len(inputBuffer.text)
+    resultBuffer.text = "Ausgabe: "
 
-layout = Layout(root_container, focused_element=inputBuffer)
+    root_container = HSplit(children=[
+        VSplit(children=[
+            Window(content=BufferControl(buffer=inputBuffer, focusable=True)),
+            Window(width=1, char='│', style="fg:#9D1D75"),
+            Window(content=BufferControl(buffer=resultBuffer, focusable=True)),
+        ]),
+        Window(height=1, char='-', style="bg:#9D1D75 fg:#FFFFFF"),
+    ])
 
-@keyB.add("enter")
-def handle_enter(event):
-    global app_state
+    layout = Layout(root_container, focused_element=inputBuffer)
 
-    user_input = inputBuffer.text.replace("Haltestelle eingeben: ", "").strip()
+    @keyB.add("enter")
+    def handle_enter(event):
+        global app_state
 
-    if user_input:
-        app_state = "RESULTS"
-        resultBuffer.text = f"Ergebnisse für: {user_input}\n\n"
+        user_input = inputBuffer.text.replace("Haltestelle eingeben: ", "").strip()
 
-        inputBuffer.text = "Haltestelle eingeben: "
-        inputBuffer.cursor_position = len(inputBuffer.text)
-    else:
-        app_state = "MONITOR"
-        resultBuffer.text = "MONITOR\n\n"
+        if user_input:
+            app_state = "RESULTS"
+            # TODO: handle case of no results gracefully
+            results = hafas.getStationNames(user_input)
+            inputBuffer.insert_line_below()
+            for station in results:
+                inputBuffer.insert_text(f"\n  {station[0]}")
+            resultBuffer.text = f"Ergebnisse für: {results[0][1]}\n\n"
+            station = results[0][1] if results else "Keine Ergebnisse gefunden."
+            result = hafas.getArrDep(station, arrdep="ARR", count=3)
+            inputBuffer.insert_line_below()
+            for entry in result:
+                resultBuffer.insert_text(f"\n  {result[0]}")
 
-        inputBuffer.text = "Haltestelle eingeben: "
-        inputBuffer.cursor_position = len(inputBuffer.text)
+        else:
+            app_state = "MONITOR"
 
-@keyB.add("c-q")
-def exit_(event):
-    stop_event.set()
-    event.app.exit()
+    @keyB.add("c-q")
+    def exit_(event):
+        stop_event.set()
+        event.app.exit()
 
-app = Application(layout=layout, full_screen=True, key_bindings=keyB)
+    app = Application(layout=layout, full_screen=True, key_bindings=keyB)
 
-try:
-    app.run()
-except KeyboardInterrupt:
-    pass
-finally:
-    stop_event.set()
+    try:
+        app.run()
+    except KeyboardInterrupt:
+        pass
+    finally:
+        stop_event.set()