Watchdog WiFi + reconnexion auto + fix timing surprise capture

- Watchdog connectivite toutes les 60s (check TCP 1.1.1.1:53)
- Si offline : scan WiFi et reconnexion auto aux reseaux enregistres
- Si internet restaure : flush immediat des spools (email + galerie)
- Surprise : capture declenchee 500ms apres affichage (au lieu de 1.7s apres)
  pour capturer la reaction naturelle des gens

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/mailer.py

@@ -179,28 +179,46 @@ def envoyer_rapport_spool(nb_envoyes: int, destinataires: list[str], nb_echoues:
 
 
 RETRY_INTERVAL = 300  # 5 minutes
+WATCHDOG_INTERVAL = 60  # 1 minute
+
+
+async def _flush_spools():
+    """Vide les spools email + galerie."""
+    from backend.destinations import traiter_booth_spool, taille_booth_spool
+    loop = asyncio.get_event_loop()
+    total_mail = taille_spool()
+    if total_mail > 0:
+        log.info(f"Spool email: retry ({total_mail} en attente)")
+        nb, dests = await loop.run_in_executor(None, traiter_spool)
+        if nb > 0:
+            echoues = total_mail - nb
+            await loop.run_in_executor(None, envoyer_rapport_spool, nb, dests, echoues)
+    total_booth = taille_booth_spool()
+    if total_booth > 0:
+        log.info(f"Spool galerie: retry ({total_booth} en attente)")
+        await loop.run_in_executor(None, traiter_booth_spool)
 
 
 async def tache_spool_periodique():
-    """Retente emails + galerie en spool toutes les 5 min."""
-    from backend.destinations import traiter_booth_spool, taille_booth_spool
+    """Watchdog connectivite (60s) + retry spool (5 min)."""
+    from backend.wifi import watchdog_tick
+    from backend.destinations import taille_booth_spool
     await asyncio.sleep(15)
+    loop = asyncio.get_event_loop()
+    ticks_depuis_flush = 0
     while True:
-        loop = asyncio.get_event_loop()
-        # Emails
-        total_mail = taille_spool()
-        if total_mail > 0:
-            log.info(f"Spool email: retry ({total_mail} en attente)")
-            nb, dests = await loop.run_in_executor(None, traiter_spool)
-            if nb > 0:
-                echoues = total_mail - nb
-                await loop.run_in_executor(None, envoyer_rapport_spool, nb, dests, echoues)
-        # Galerie booth
-        total_booth = taille_booth_spool()
-        if total_booth > 0:
-            log.info(f"Spool galerie: retry ({total_booth} en attente)")
-            await loop.run_in_executor(None, traiter_booth_spool)
-        await asyncio.sleep(RETRY_INTERVAL)
+        result = await loop.run_in_executor(None, watchdog_tick)
+        if result == "restored":
+            await _flush_spools()
+            ticks_depuis_flush = 0
+        else:
+            ticks_depuis_flush += 1
+            if ticks_depuis_flush >= RETRY_INTERVAL // WATCHDOG_INTERVAL:
+                has_spool = taille_spool() > 0 or taille_booth_spool() > 0
+                if has_spool:
+                    await _flush_spools()
+                ticks_depuis_flush = 0
+        await asyncio.sleep(WATCHDOG_INTERVAL)
 
 
 async def tache_spool_demarrage():

backend/wifi.py

@@ -201,3 +201,62 @@ def wifi_forget(ssid: str) -> dict:
 
 def wifi_get_password(ssid: str) -> str | None:
     return _charger_mdp().get(ssid)
+
+
+# --- Watchdog connectivité ---
+
+_internet_ok = False
+
+
+def check_internet(timeout: int = 5) -> bool:
+    """Teste la connectivité internet (DNS + HTTP rapide)."""
+    import socket
+    try:
+        socket.create_connection(("1.1.1.1", 53), timeout=timeout).close()
+        return True
+    except OSError:
+        return False
+
+
+def watchdog_tick() -> str | None:
+    """Vérifie internet. Retourne 'restored' si passage offline→online, None sinon."""
+    global _internet_ok
+    now_ok = check_internet()
+    if now_ok and not _internet_ok:
+        _internet_ok = True
+        log.info("Internet restauré — flush spool")
+        return "restored"
+    _internet_ok = now_ok
+    if not now_ok:
+        _tenter_reconnexion_wifi()
+    return None
+
+
+def _tenter_reconnexion_wifi():
+    """Si déconnecté du WiFi, tente de se reconnecter à un réseau enregistré visible."""
+    status = wifi_status()
+    if status["connecte"]:
+        return
+    log.info("Pas de WiFi — scan des réseaux enregistrés")
+    saved = {n["ssid"] for n in wifi_saved_list()}
+    if not saved:
+        return
+    try:
+        r = subprocess.run(
+            ["nmcli", "-t", "-f", "SSID,SIGNAL", "dev", "wifi", "list", "--rescan", "yes"],
+            capture_output=True, text=True, timeout=15,
+        )
+        candidates = []
+        for line in r.stdout.strip().split("\n"):
+            p = _nmcli_split(line)
+            if len(p) >= 2 and p[0] in saved and p[1].isdigit():
+                candidates.append((p[0], int(p[1])))
+        candidates.sort(key=lambda x: -x[1])
+        for ssid, sig in candidates:
+            log.info(f"Tentative reconnexion WiFi: {ssid} (signal {sig}%)")
+            result = wifi_connect(ssid)
+            if result.get("succes"):
+                log.info(f"Reconnecté à {ssid}")
+                return
+    except Exception as e:
+        log.warning(f"Reconnexion WiFi échouée: {e}")

frontend/index.html

@@ -1146,7 +1146,7 @@
 
   <script src="/js/websocket.js?v=16"></script>
   <script src="/js/app.js?v=25"></script>
-  <script src="/js/camera.js?v=23"></script>
+  <script src="/js/camera.js?v=24"></script>
   <script src="/js/effects.js?v=4"></script>
   <script src="/js/gallery.js?v=5"></script>
   <script src="/js/share.js?v=10"></script>

frontend/js/camera.js

@@ -22,13 +22,12 @@ function prechargerSurprise() {
   _surprisePreloaded = img;
 }
 
-async function afficherSurprise() {
+function montrerSurprise() {
   const surprise = (config || {}).surprise;
-  if (!surprise || !surprise.actif || !surprise.fichier) return;
-  const delai = surprise.delai_ms || 1500;
+  if (!surprise || !surprise.actif || !surprise.fichier) return false;
 
   const overlay = document.getElementById('surprise-overlay');
-  if (!overlay) return;
+  if (!overlay) return false;
 
   if (surprise.type === 'video') {
     overlay.innerHTML = '<video src="/api/surprise/media" autoplay muted playsinline style="max-width:100%;max-height:100%;object-fit:contain"></video>';
@@ -39,26 +38,24 @@ async function afficherSurprise() {
       overlay.appendChild(_surprisePreloaded);
     } else {
       overlay.innerHTML = '<img src="/api/surprise/media" style="max-width:100%;max-height:100%;object-fit:contain">';
-      const img = overlay.querySelector('img');
-      if (img && !img.complete) {
-        await new Promise(r => { img.onload = r; img.onerror = r; setTimeout(r, 500); });
-      }
     }
   }
   overlay.style.opacity = '0';
   overlay.classList.remove('cache');
-  overlay.style.transition = 'opacity 0.2s';
+  overlay.style.transition = 'opacity 0.15s';
   overlay.style.opacity = '1';
+  return true;
+}
 
-  await new Promise(r => setTimeout(r, delai));
-
+function cacherSurprise() {
+  const overlay = document.getElementById('surprise-overlay');
+  if (!overlay) return;
   overlay.style.opacity = '0';
-  await new Promise(r => setTimeout(r, 200));
-  overlay.classList.add('cache');
-  overlay.style.transition = '';
-  overlay.style.opacity = '';
-
-  prechargerSurprise();
+  setTimeout(() => {
+    overlay.classList.add('cache');
+    overlay.style.transition = '';
+    overlay.style.opacity = '';
+  }, 200);
 }
 
 // --- Preview live ---
@@ -320,7 +317,9 @@ async function lancerCapture() {
     await compteARebours(avecPreMessages);
 
     // Surprise : seulement en photo simple (pas strip/multi)
-    if (modeActuel === 'simple') await afficherSurprise();
+    // Affiche la surprise PUIS capture pendant que les gens reagissent
+    const aSurprise = (modeActuel === 'simple') && montrerSurprise();
+    if (aSurprise) await pause(500);
 
     // Flash blanc immédiat + lancer capture en parallèle
     const flash = document.getElementById('flash-blanc');
@@ -331,6 +330,7 @@ async function lancerCapture() {
 
     arreterPreview();
     let resultat = await apiPost('/api/capturer').catch(() => null);
+    if (aSurprise) { cacherSurprise(); prechargerSurprise(); }
 
     if (!resultat && !resultat?.erreur) {
       flash.classList.add('cache');