fix query router and formatters

Author: AH431

packages/ai_service/src/router/query_router.py

@@ -26,6 +26,15 @@
 # not per-customer live data, even when a customer name appears in the question.
 _PAYMENT_TERMS_STATIC = re.compile(r'付款條件|付款天數|付款期限|payment\s*term', re.IGNORECASE)
 
+# "STM32F103C8 is out of stock. What are the alternatives?" is a procurement
+# knowledge question (answered from static knowledge cards), not a live inventory
+# lookup — even though "stock" triggers the bare inventory keyword.
+_OUT_OF_STOCK_ALT_STATIC = re.compile(
+    r'out\s+of\s+stock.{0,80}(?:alternative|substitut|replace|instead)'
+    r'|(?:alternative|substitut|replace).{0,80}out\s+of\s+stock',
+    re.IGNORECASE,
+)
+
 
 def route(question: str) -> ParsedQuery:
     """Return the routing decision for a user question."""
@@ -41,6 +50,11 @@ def route(question: str) -> ParsedQuery:
             and _PAYMENT_TERMS_STATIC.search(question)):
         return ParsedQuery(route='static')
 
+    # De-escalate: "X is out of stock, what are the alternatives?" is a static
+    # procurement knowledge question, not a live inventory lookup.
+    if parsed.route == 'dynamic' and _OUT_OF_STOCK_ALT_STATIC.search(question):
+        return ParsedQuery(route='static')
+
     # Upgrade: customer detail questions still need a search term before using live lookup.
     if parsed.tool == 'customer' and not parsed.search_term:
         return ParsedQuery(route='static')

packages/ai_service/src/tools/formatters.py

@@ -26,13 +26,13 @@ def format_inventory_answer(product: dict, inventory: dict) -> str:
     ]
 
     if available <= critical_stock:
-        lines.append(f"🔴 Critical: Available ({available}) is below critical level ({critical_stock}). Immediate action required.")
+        lines.append(f"[CRITICAL] Available ({available}) is below critical level ({critical_stock}). Immediate action required.")
     elif available <= alert_stock:
-        lines.append(f"🟠 Alert: Available ({available}) is below alert level ({alert_stock}). Please source urgently.")
+        lines.append(f"[ALERT] Available ({available}) is below alert level ({alert_stock}). Please source urgently.")
     elif available <= min_stock:
-        lines.append(f"🟡 Warning: Available ({available}) is below minimum level ({min_stock}). Consider replenishing.")
+        lines.append(f"[WARNING] Available ({available}) is below minimum level ({min_stock}). Consider replenishing.")
     else:
-        lines.append(f"✅ Stock sufficient (available {available} units, above minimum {min_stock} units).")
+        lines.append(f"[OK] Stock sufficient (available {available} units, above minimum {min_stock} units).")
 
     return "\n".join(lines)
 

packages/frontend/lib/features/ai/chat_screen.dart

@@ -151,14 +151,13 @@ class _MessageTile extends StatelessWidget {
         child: Column(
           crossAxisAlignment: CrossAxisAlignment.start,
           children: [
-            Text(
-              message.content.isEmpty && message.isStreaming
-                  ? '▌'
-                  : message.content,
-              style: TextStyle(
-                color: isUser ? cs.onPrimaryContainer : cs.onSurface,
+            if (message.content.isEmpty && message.isStreaming)
+              Text('▌', style: TextStyle(color: cs.onSurface))
+            else
+              _StyledMessageContent(
+                content: message.content,
+                baseColor: isUser ? cs.onPrimaryContainer : cs.onSurface,
               ),
-            ),
             if (message.isStreaming && message.content.isNotEmpty)
               const Padding(
                 padding: EdgeInsets.only(top: 4),
@@ -185,6 +184,54 @@ class _MessageTile extends StatelessWidget {
   }
 }
 
+// 將 [CRITICAL]/[ALERT]/[WARNING]/[OK] 轉為 icon + 文字行
+class _StyledMessageContent extends StatelessWidget {
+  final String content;
+  final Color baseColor;
+
+  const _StyledMessageContent({required this.content, required this.baseColor});
+
+  static const _kTags = {
+    '[CRITICAL]': (Icons.error,          Colors.red),
+    '[ALERT]':    (Icons.warning_rounded, Colors.orange),
+    '[WARNING]':  (Icons.warning_amber_outlined, Colors.amber),
+    '[OK]':       (Icons.check_circle_outline,   Colors.green),
+  };
+
+  @override
+  Widget build(BuildContext context) {
+    final lines = content.split('\n');
+    return Column(
+      crossAxisAlignment: CrossAxisAlignment.start,
+      children: lines.map((line) {
+        for (final entry in _kTags.entries) {
+          if (line.startsWith(entry.key)) {
+            final (icon, color) = entry.value;
+            final rest = line.substring(entry.key.length).trimLeft();
+            return Padding(
+              padding: const EdgeInsets.only(top: 4),
+              child: Row(
+                crossAxisAlignment: CrossAxisAlignment.start,
+                children: [
+                  Icon(icon, size: 16, color: color),
+                  const SizedBox(width: 4),
+                  Expanded(
+                    child: Text(
+                      rest,
+                      style: TextStyle(color: baseColor, fontWeight: FontWeight.w600),
+                    ),
+                  ),
+                ],
+              ),
+            );
+          }
+        }
+        return Text(line, style: TextStyle(color: baseColor));
+      }).toList(),
+    );
+  }
+}
+
 // ── 快捷測試題按鈕 ────────────────────────────────────────
 
 enum _ChipGroup { dynamic_, static_, blocked }