From c978a25b7fbb250884a3503e90abc7f3be9757ac Mon Sep 17 00:00:00 2001
From: Administrator <admin@example.com>
Date: Sat, 27 Jun 2026 15:12:28 +0800
Subject: [PATCH] Fix 3qfx task context fallback

---
 frontend-web/src/core/auth/task-deeplink.ts   |  8 +++++++
 frontend-web/src/pages/AgentChatPage.tsx      | 24 +++++++++++++++----
 .../task-components/TaskFxWorkspace.tsx       |  7 +++++-
 3 files changed, 34 insertions(+), 5 deletions(-)

diff --git a/frontend-web/src/core/auth/task-deeplink.ts b/frontend-web/src/core/auth/task-deeplink.ts
index 0ca46a84..673073d5 100644
--- a/frontend-web/src/core/auth/task-deeplink.ts
+++ b/frontend-web/src/core/auth/task-deeplink.ts
@@ -260,6 +260,14 @@ function buildOpeningText(detail: CopTaskDetail, taskId: string, action?: Action
     .join("\n");
 }
 
+/**
+ * 3qfx/rwfx 这类“按任务id 直接问答”的任务工作区，在 ``TaskContext`` 丢失但
+ * ``login.copTaskDetail`` 仍存在时，可用它重新拼出开场词做前端自恢复。
+ */
+export function buildTaskOpeningText(detail: CopTaskDetail, taskId: string): string {
+  return buildOpeningText(detail, taskId);
+}
+
 /**
  * 据 goPath + 任务详情解析跳转目标。
  *   - 多智能体会商：返回带 ``roundtablePrefill``（businessCode 让会商页自动选用配置的业务链条；
diff --git a/frontend-web/src/pages/AgentChatPage.tsx b/frontend-web/src/pages/AgentChatPage.tsx
index b5319a92..e5309bfe 100644
--- a/frontend-web/src/pages/AgentChatPage.tsx
+++ b/frontend-web/src/pages/AgentChatPage.tsx
@@ -53,6 +53,7 @@ import { env } from "@/env";
 import { readTaskContext, taskThreadMetadata } from "@/core/auth/task-purpose";
 import { TaskPurposePanel } from "@/strategy-components/components/task-components/TaskPurposePanel";
 import { desensitize } from "@/lib/desensitize";
+import { buildTaskOpeningText, readCopTaskDetail } from "@/core/auth/task-deeplink";
 
 /** 内置「模板数据转换器」agent 的稳定 id。仅此 agent 的对话页显示「页面模板 + 渲染预览」调试入口。 */
 const TEMPLATE_BUILDER_AGENT_ID = "template-json-builder";
@@ -100,10 +101,25 @@ export default function AgentChatPage({
 
   // 任务深链上下文（taskId + 开场信息）：闸门(rwfx)与纯绑定(3qfx/xdfx)都要读取。
   const taskCtxOn = !!(taskGate || taskBind);
-  const taskContext = useMemo(
-    () => (taskCtxOn ? readTaskContext() : null),
-    [taskCtxOn],
-  );
+  const taskContext = useMemo(() => {
+    if (!taskCtxOn) return null;
+    const stored = readTaskContext();
+    if (stored && stored.agentId === agent_id) return stored;
+    // 3qfx：若任务上下文偶发丢失，但登录深链留下的任务详情仍在，则用它前端兜底重建
+    // taskId + openingText，避免 landing 既不自动开始、也没有“开始回答”按钮。
+    if (taskBind && !taskGate) {
+      const detail = readCopTaskDetail();
+      const fallbackTaskId = detail?.id == null ? "" : String(detail.id).trim();
+      if (detail && fallbackTaskId && agent_id) {
+        return {
+          taskId: fallbackTaskId,
+          agentId: agent_id,
+          openingText: buildTaskOpeningText(detail, fallbackTaskId),
+        };
+      }
+    }
+    return stored;
+  }, [agent_id, taskBind, taskCtxOn, taskGate]);
   const taskId =
     taskCtxOn && taskContext && taskContext.agentId === agent_id
       ? taskContext.taskId
diff --git a/frontend-web/src/strategy-components/components/task-components/TaskFxWorkspace.tsx b/frontend-web/src/strategy-components/components/task-components/TaskFxWorkspace.tsx
index bc2cd190..dfa1b7c2 100644
--- a/frontend-web/src/strategy-components/components/task-components/TaskFxWorkspace.tsx
+++ b/frontend-web/src/strategy-components/components/task-components/TaskFxWorkspace.tsx
@@ -60,7 +60,12 @@ function useChatsBase(taskBase: string): {
   const { agent_id } = useParams<{ agent_id: string }>();
   const agentId = agent_id ?? "";
   const ctx = readTaskContext();
-  const taskId = ctx?.taskId ?? "";
+  const detail = readCopTaskDetail();
+  const fallbackTaskId =
+    detail?.id == null ? "" : String(detail.id).trim();
+  // 3qfx 偶发会出现 task context 丢失，但任务详情仍在 sessionStorage 的情况。
+  // 这里回退到任务详情里的 taskId，避免左侧对话列表直接失效成“空任务态”。
+  const taskId = ctx?.taskId ?? fallbackTaskId;
   const actionId = ctx?.partitionByAction ? (ctx.actionId ?? "") : "";
   return { taskId, agentId, actionId, chatsBase: `${taskBase}/agent/${agentId}/chats` };
 }