Update app_shared.py

app_shared.py

@@ -398,27 +398,40 @@ class ChatManager:
         current_time = time.time()
         step = st.session_state.chat_step
         history = st.session_state.chat_history
-
-        if step < len(self.initial_history) and (current_time - st.session_state.last_update_time > CHAT_CONFIG["update_interval"]):
-            next_msg = self.initial_history[step]
-
-            if next_msg["role"] == "user":
-                # 用户内容直接加入
+    
+        if step >= len(self.initial_history):
+            return  # 结束，无消息处理
+    
+        if current_time - st.session_state.last_update_time < CHAT_CONFIG["update_interval"]:
+            return  # 等待更新间隔
+    
+        next_msg = self.initial_history[step]
+    
+        if next_msg["role"] == "user":
+            # 只有当 history 最后一条不是这个用户消息，才添加，避免重复
+            if len(history) == 0 or history[-1]["content"] != next_msg["content"]:
                 history.append(next_msg)
-            else:  # assistant
-                # 校验上一条必须是用户消息
-                if len(history) == 0 or history[-1]["role"] != "user":
-                    st.warning("⚠️ 无法生成 AI 回答：找不到上一条用户消息")
-                    return
-
-                user_prompt = history[-1]["content"]
-                app_id = "c968f91131ac432787f5ef81f51922ba"
-                api_key = os.getenv("DASHSCOPE_API_KEY")
-                ai_reply = self.generate_response(user_prompt, app_id, api_key)
+            st.session_state.chat_step += 1
+            st.session_state.last_update_time = current_time
+    
+        elif next_msg["role"] == "assistant":
+            # 必须保证上一条是用户消息
+            if len(history) == 0 or history[-1]["role"] != "user":
+                st.warning("⚠️ 无法生成 AI 回答：找不到上一条用户消息")
+                return
+    
+            user_prompt = history[-1]["content"]
+            app_id = "c968f91131ac432787f5ef81f51922ba"
+            api_key = os.getenv("DASHSCOPE_API_KEY")
+            ai_reply = self.generate_response(user_prompt, app_id, api_key)
+    
+            # 避免重复插入相同的回复
+            if len(history) == 0 or history[-1]["content"] != ai_reply:
                 history.append({"role": "assistant", "content": ai_reply})
-
+    
             st.session_state.chat_step += 1
             st.session_state.last_update_time = current_time
+
             
 
     def render_message(self, role: str, content: str) -> str: