feat(ui): add center mode toggle (city vs coordinates) to prepare lat/lon support

app.py

@@ -43,11 +43,27 @@ def preset_to_distance(preset):
     }.get(preset, None)
 
 
-def generate(city, country, theme, preset, distance_m, fast_mode, map_format, orientation):
+def generate(
+    center_mode,
+    city,
+    country,
+    lat,
+    lon,
+    theme,
+    preset,
+    distance_m,
+    fast_mode,
+    map_format,
+    orientation,
+):
     """
     Run the poster script and stream logs into the UI.
 
     Note: tqdm progress can sit at 0% for a while, then jump to 33%/66%/100% (normal).
+
+    IMPORTANT (for now):
+    - We still call the script using --city/--country.
+    - center_mode/lat/lon are UI-only for now (we'll wire them to --lat/--lon later).
     """
     POSTERS_DIR.mkdir(parents=True, exist_ok=True)
 
@@ -74,10 +90,17 @@ def generate(city, country, theme, preset, distance_m, fast_mode, map_format, or
         "--orientation", orientation,
     ]
 
+    # UI-only note (until we wire lat/lon into the script)
+    if center_mode == "Coordinates":
+        cmd_note = f"Center: Coordinates (lat={lat}, lon={lon}) [UI-only for now]"
+    else:
+        cmd_note = f"Center: City ({city}, {country})"
+
     before = [str(p) for p in list_pngs()]
 
     status_lines = []
     status_lines.append("🚀 Starting… (OSM downloads can be slow on shared Spaces)")
+    status_lines.append(cmd_note)
     status_lines.append(f"Command: {' '.join(cmd)}")
     status_lines.append("Tip: if you see '0%|0/3' for a while, it may jump to 33% all at once.")
     yield "\n".join(status_lines), None
@@ -127,12 +150,36 @@ def on_format_change(fmt):
     return gr.update(interactive=True)
 
 
+def on_center_mode_change(mode):
+    """Show lat/lon inputs only when Coordinates is selected."""
+    if mode == "Coordinates":
+        return gr.update(visible=False), gr.update(visible=False), gr.update(visible=True), gr.update(visible=True)
+    # City mode
+    return gr.update(visible=True), gr.update(visible=True), gr.update(visible=False), gr.update(visible=False)
+
+
 with gr.Blocks() as demo:
     gr.Markdown("# MapToPoster – Hugging Face Demo")
 
+    center_mode = gr.Radio(
+        label="Center",
+        choices=["City", "Coordinates"],
+        value="City",
+    )
+
+    with gr.Row():
+        city = gr.Textbox(label="City", value="Paris", visible=True)
+        country = gr.Textbox(label="Country", value="France", visible=True)
+
     with gr.Row():
-        city = gr.Textbox(label="City", value="Paris")
-        country = gr.Textbox(label="Country", value="France")
+        lat = gr.Number(label="Latitude", value=48.8566, visible=False)
+        lon = gr.Number(label="Longitude", value=2.3522, visible=False)
+
+    center_mode.change(
+        on_center_mode_change,
+        inputs=[center_mode],
+        outputs=[city, country, lat, lon],
+    )
 
     with gr.Row():
         theme = gr.Dropdown(
@@ -177,7 +224,7 @@ with gr.Blocks() as demo:
 
     btn.click(
         generate,
-        inputs=[city, country, theme, preset, distance, fast_mode, map_format, orientation],
+        inputs=[center_mode, city, country, lat, lon, theme, preset, distance, fast_mode, map_format, orientation],
         outputs=[status, out],
     )