feat: relay inversé, LED idle solid, luminosité manuelle, auto-flash lux

backend/api/webhooks.py

@@ -27,6 +27,9 @@ async def photobooth_webhook(
     match event_key:
         case "counting":
             led.play("countdown", countdown_duration=DEFAULT_COUNTDOWN)
+            if request.app.state.config.leds.auto_brightness:
+                pb = request.app.state.photobooth_service
+                asyncio.create_task(_analyze_ambient_lux(led, pb))
 
         case "capture":
             led.play("capture")
@@ -58,3 +61,21 @@ async def _delayed_relay_on(btn, delay: float):
     await asyncio.sleep(delay)
     if btn:
         btn.relay_on()
+
+
+async def _analyze_ambient_lux(led, pb):
+    """Capture une frame du liveview et calcule la luminosite moyenne."""
+    try:
+        snapshot = await pb.get_liveview_snapshot()
+        if not snapshot:
+            logger.debug("Analyse lux: aucun snapshot disponible")
+            return
+        from PIL import Image
+        import io
+        img = Image.open(io.BytesIO(snapshot)).convert("L").resize((80, 60))
+        pixels = list(img.getdata())
+        avg = sum(pixels) / len(pixels)
+        led.set_ambient_lux(avg)
+        logger.info("Luminosite ambiante: %.1f / 255", avg)
+    except Exception as e:
+        logger.warning("Analyse lux echouee: %s", e)