Fixed the Issue Where Search History was not Displayed in Media Engine

@@ -263,7 +263,12 @@ class DeepSearchAgent:
             logger.info("  - 未找到搜索结果")
         
         # 更新状态中的搜索历史
-        paragraph.research.add_search_results(search_query, search_results)
+        paragraph.research.add_search_results(
+            search_query,
+            search_results,
+            search_tool=search_tool,
+            paragraph_title=paragraph.title,
+        )
         
         # 生成初始总结
         logger.info("  - 生成初始总结...")
@@ -341,7 +346,12 @@ class DeepSearchAgent:
                 logger.info("    未找到反思搜索结果")
             
             # 更新搜索历史
-            paragraph.research.add_search_results(search_query, search_results)
+            paragraph.research.add_search_results(
+                search_query,
+                search_results,
+                search_tool=search_tool,
+                paragraph_title=paragraph.title,
+            )
             
             # 生成反思总结
             reflection_summary_input = {

@@ -17,6 +17,9 @@ class Search:
     title: str = ""                    # 搜索结果标题
     content: str = ""                  # 搜索返回的内容
     score: Optional[float] = None      # 相关度评分
+    paragraph_title: str = ""          # 段落标题，便于展示归属
+    search_tool: str = ""              # 使用的搜索工具
+    has_result: bool = True            # 是否有返回结果
     timestamp: str = field(default_factory=lambda: datetime.now().isoformat())
     
     def to_dict(self) -> Dict[str, Any]:
@@ -27,6 +30,9 @@ class Search:
             "title": self.title,
             "content": self.content,
             "score": self.score,
+            "paragraph_title": self.paragraph_title,
+            "search_tool": self.search_tool,
+            "has_result": self.has_result,
             "timestamp": self.timestamp
         }
     
@@ -39,6 +45,9 @@ class Search:
             title=data.get("title", ""),
             content=data.get("content", ""),
             score=data.get("score"),
+            paragraph_title=data.get("paragraph_title", ""),
+            search_tool=data.get("search_tool", ""),
+            has_result=data.get("has_result", True),
             timestamp=data.get("timestamp", datetime.now().isoformat())
         )
 
@@ -55,23 +64,42 @@ class Research:
         """添加搜索记录"""
         self.search_history.append(search)
     
-    def add_search_results(self, query: str, results: List[Dict[str, Any]]):
+    def add_search_results(self, query: str, results: List[Dict[str, Any]], search_tool: str = "", paragraph_title: str = ""):
         """批量添加搜索结果"""
+        if not results:
+            # 记录一次“无结果”搜索，方便前端显示搜索轨迹
+            self.add_search(
+                Search(
+                    query=query or "",
+                    title="未找到结果",
+                    content="本次搜索未返回结果或调用失败",
+                    url="",
+                    score=None,
+                    paragraph_title=paragraph_title,
+                    search_tool=search_tool,
+                    has_result=False,
+                )
+            )
+            return
+
         for result in results:
-            # 防御空值，避免下游展示时报错
             url = result.get("url") or ""
             title = result.get("title") or ""
-            content = result.get("content") or ""
+            content = result.get("content") or result.get("raw_content") or ""
             if not isinstance(content, str):
                 content = str(content)
-            search = Search(
+            self.add_search(
+                Search(
                     query=query or "",
                     url=url,
                     title=title,
                     content=content,
-                score=result.get("score")
+                    score=result.get("score"),
+                    paragraph_title=paragraph_title or result.get("paragraph_title", ""),
+                    search_tool=search_tool or result.get("search_tool", ""),
+                    has_result=True,
+                )
             )
-            self.add_search(search)
     
     def get_search_count(self) -> int:
         """获取搜索次数"""

@@ -222,14 +222,21 @@ def display_results(agent: DeepSearchAgent, final_report: str):
             for i, search in enumerate(all_searches):
                 query_label = search.query if search.query else "未记录查询"
                 with st.expander(f"搜索 {i + 1}: {query_label}"):
+                    paragraph_title = getattr(search, "paragraph_title", "") or "未标注段落"
+                    search_tool = getattr(search, "search_tool", "") or "未标注工具"
+                    has_result = getattr(search, "has_result", True)
+                    st.write("**段落:**", paragraph_title)
+                    st.write("**使用的工具:**", search_tool)
                     preview = search.content or ""
                     if not isinstance(preview, str):
                         preview = str(preview)
                     if len(preview) > 200:
                         preview = preview[:200] + "..."
-                    st.write("**URL:**", search.url)
-                    st.write("**标题:**", search.title)
+                    st.write("**URL:**", search.url or "无")
+                    st.write("**标题:**", search.title or "无")
                     st.write("**内容预览:**", preview if preview else "无可用内容")
+                    if not has_result:
+                        st.info("本次搜索未返回结果")
                     if search.score:
                         st.write("**相关度评分:**", search.score)