refactor(chat): move WebSocket lifecycle into chat machine via fromCallback actor

- chat-screen no longer manages WebSocket directly; it now dispatches three
  auth lifecycle events (ChatGuestLogin, ChatNonGuestLogin, ChatLogout)
  derived from auth.loginStatus
- chat-machine internally owns the WebSocket long-lived actor via
  fromCallback, completing the previously deferred migration scope
- removed ChatWebSocket import, getWsToken helper, and direct WS
  effect from chat-screen; renamed dispatchInitialLoad to
  dispatchAuthLifecycle to reflect the new responsibility
- decouples auth from chat machine via event-driven boundary: machine
  stays unaware of loginStatus, guest semantics live at the dispatch
  layer (guest → skip WS, non-guest → connect with token)

src/stores/chat/chat-machine.ts

@@ -5,32 +5,49 @@
  *
  * 本轮迁移范围：
  *   ✅ HTTP 流程（init / send message / load more history）
+ *   ✅ WebSocket 长生命周期（**由** chat 机器内 fromCallback actor 管）
  *   ✅ 上下文数据（messages / quota / 标志位）
- *   ⏳ WebSocket 长生命周期 actor（fromCallback）—— 下轮处理
  *
  * 设计要点：
  *   - 使用 XState v5 `setup({...}).createMachine({...})` 声明式 API
  *   - HTTP 操作用 `fromPromise` actor（一次性 Promise）
+ *   - WebSocket 用 `fromCallback` actor（长生命周期）—— **机器内**完整管理
+ *   - chat-screen **不**直接管理 WS —— 只派 3 个鉴权生命周期事件
  *   - 保持事件类型名与原 Dart 一致，便于业务层迁移对照
- *   - actions 全部 inline 在 setup() 中（确保类型推断正确）
  *
- * **鉴权解耦**：
- *   chat 机器**不**感知鉴权状态 —— `isGuest` 字段已删（由 chat-screen 派生自 auth.loginStatus）。
- *   WebSocket 管理也由 chat-screen 监听 auth 状态机后驱动。
+ * **鉴权解耦**（**事件驱动**）：
+ *   chat 机器**不**感知鉴权 / **不**管 WebSocket —— 由 chat-screen 派生 loginStatus
+ *   chat-screen **只**派 3 个事件：
+ *     - `ChatGuestLogin` → 游客会话（**断** WS = 不连）
+ *     - `ChatNonGuestLogin { token }` → 非游客会话（**连** WS）
+ *     - `ChatLogout` → 登出（机器自动 cleanup WS actor）
+ *
+ * **状态结构**（parent state 模式）：
+ *   - `idle`：屏没挂 / 登出
+ *   - `guestSession`（**parent**）：游客会话 —— **不** invoke WS
+ *     - `initializing`：invoke chatInit（拉本地 + 初始化配额）
+ *     - `ready`：用户聊天 + 翻历史
+ *     - `loadingMore`：invoke loadMoreHistory（翻历史）
+ *   - `userSession`（**parent**）：非游客会话 —— **invoke WS**（持久）
+ *     - `initializing`：invoke loadMoreHistory（拉服务器端首屏）
+ *     - `ready`：用户聊天 + 翻历史
+ *     - `loadingMore`：invoke loadMoreHistory（翻历史）
+ *   WS 在 `userSession` parent 状态 invoke —— 跨 initializing/ready/loadingMore 持续
  *
  * **配额（**仅**游客）**：
  *   - `guestRemainingQuota` / `guestTotalQuota` **仅**游客有意义
  *   - 非游客"无消息限制"（业务事实）—— 永不被赋值
- *   - chat-screen 派 `ChatInit` 时（**只**在 guest）→ onDone 条件赋
+ *   - `ChatGuestLogin` 触发 chatInitActor → onDone 条件赋
  *   - `appendUserMessage` 减 `Math.max(0, q - 1)` —— 非游客 0-1=0 天然 no-op
  */
-import { setup, fromPromise, assign } from "xstate";
+import { setup, fromPromise, fromCallback, assign } from "xstate";
 
 import type { UiMessage } from "@/models/chat/ui-message";
 import { chatRepository } from "@/data/repositories/chat_repository";
 import type { IChatRepository } from "@/data/repositories/interfaces";
 import { ChatStorage } from "@/data/storage/chat/chat_storage";
 import { AuthStorage } from "@/data/storage/auth/auth_storage";
+import { createChatWebSocket } from "@/core/net/chat-websocket";
 import { formatDate } from "@/utils/date";
 import { Result } from "@/utils/result";
 
@@ -48,8 +65,7 @@ export type { ChatState } from "./chat-state";
 export { initialState } from "./chat-state";
 export type { ChatEvent } from "./chat-events";
 
-// ============================================================
-// Helpers
+// ============================================================// Helpers
 // ============================================================
 const PAGE_SIZE = 20;
 
@@ -123,9 +139,9 @@ async function readInitData(): Promise<InitResult> {
   };
 }
 
+// ============================================================// Actors
 // ============================================================
-// Actors
-// ============================================================
+// HTTP：一次性 Promise
 const chatInitActor = fromPromise<InitResult>(async () => readInitData());
 
 const sendMessageHttpActor = fromPromise<
@@ -158,6 +174,33 @@ const loadMoreHistoryActor = fromPromise<
   };
 });
 
+// WebSocket：长生命周期（**由** chat 机器内 fromCallback actor 管）
+//   - 启动：连 WS，事件 → sendBack 派回机器
+//   - 停止（cleanup）：disconnect
+//   - **游客**不** invoke 此 actor（业务事实"游客不连 WS"）
+const chatWebSocketActor = fromCallback<ChatEvent, { token: string }>(
+  ({ sendBack, input }) => {
+    const ws = createChatWebSocket(input.token);
+    ws.onConnected = (userId) => {
+      sendBack({ type: "ChatWebSocketConnected", userId });
+    };
+    ws.onSentence = (p) => {
+      sendBack({
+        type: "ChatAISentenceReceived",
+        index: p.index,
+        text: p.text,
+        total: p.total,
+        done: p.done,
+      });
+    };
+    ws.onError = (msg) => {
+      sendBack({ type: "ChatWebSocketError", errorMessage: msg });
+    };
+    ws.connect();
+    return () => ws.disconnect();
+  },
+);
+
 // ============================================================// Machine
 // ============================================================
 export const chatMachine = setup({
@@ -169,6 +212,7 @@ export const chatMachine = setup({
     chatInit: chatInitActor,
     sendMessageHttp: sendMessageHttpActor,
     loadMoreHistory: loadMoreHistoryActor,
+    chatWebSocket: chatWebSocketActor,
   },
   actions: {
     appendUserMessage: assign(({ context, event }) => {
@@ -248,81 +292,181 @@ export const chatMachine = setup({
   initial: "idle",
   context: initialState,
   states: {
+    // ─────────────────────────────────────────────────────────────
+    // 屏没挂 / 登出 / 跨态前
+    // ─────────────────────────────────────────────────────────────
     idle: {
       on: {
-        ChatInit: "initializing",
-        ChatLoadMoreHistory: "loadingMoreHistory",
-        ChatSendMessage: {
-          guard: ({ event }) => event.content.trim().length > 0,
-          actions: "appendUserMessage",
-        },
-        ChatSendImage: {
-          actions: "appendUserImage",
-        },
-        ChatAISentenceReceived: {
-          actions: "appendOrUpdateAISentence",
-        },
-        ChatWebSocketError: {
-          actions: "appendSocketErrorMessage",
-        },
-        ChatQuotaExceeded: {
-          actions: "incrementQuotaExceeded",
-        },
-        ChatWebSocketConnected: {},
+        ChatGuestLogin: "guestSession",
+        ChatNonGuestLogin: "userSession",
+        // 兼容旧事件（**无**资源 —— 旧 chat-screen 还在派 ChatInit）
+        ChatInit: "guestSession",
+        ChatLoadMoreHistory: "loadingMoreHistory", // 旧逻辑保留（翻历史用）
       },
     },
 
-    initializing: {
+    // ─────────────────────────────────────────────────────────────
+    // 游客会话（**不** invoke WS —— "断 WS"业务事实）
+    // ─────────────────────────────────────────────────────────────
+    guestSession: {
+      initial: "initializing",
+      // guestSession **不** invoke chatWebSocket —— 业务事实"游客不连 WS"
+      states: {
+        initializing: {
+          invoke: {
+            src: "chatInit",
+            onDone: {
+              target: "ready",
+              // **条件赋**：仅 isGuest 时初始化配额（业务事实"非游客无消息限制"）
+              actions: assign(({ event }) => {
+                const updates: Partial<ChatState> = {
+                  messages: event.output.localMessages,
+                };
+                if (event.output.isGuest) {
+                  updates.guestRemainingQuota =
+                    event.output.guestRemainingQuota;
+                  updates.guestTotalQuota = event.output.guestTotalQuota;
+                }
+                return updates;
+              }),
+            },
+            onError: {
+              target: "ready",
+            },
+          },
+        },
+        ready: {
+          on: {
+            ChatSendMessage: {
+              guard: ({ event }) => event.content.trim().length > 0,
+              actions: "appendUserMessage",
+            },
+            ChatSendImage: {
+              actions: "appendUserImage",
+            },
+            ChatLoadMoreHistory: "loadingMore",
+            ChatScreenInvisible: "idle", // 屏不可见 → idle
+            ChatLogout: "idle", // 登出 → idle
+            // 跨态（游客 → email）
+            ChatNonGuestLogin: "userSession",
+            ChatAISentenceReceived: {
+              actions: "appendOrUpdateAISentence",
+            },
+            ChatWebSocketError: {
+              actions: "appendSocketErrorMessage",
+            },
+            ChatQuotaExceeded: {
+              actions: "incrementQuotaExceeded",
+            },
+            ChatWebSocketConnected: {},
+          },
+        },
+        loadingMore: {
+          invoke: {
+            src: "loadMoreHistory",
+            input: ({ context }) => ({ offset: context.historyOffset }),
+            onDone: {
+              target: "ready",
+              actions: assign(({ context, event }) => ({
+                messages: [...event.output.messages, ...context.messages],
+                isLoadingMore: false,
+                hasMore: event.output.hasMore,
+                historyOffset: event.output.newOffset,
+              })),
+            },
+            onError: {
+              target: "ready",
+              actions: assign({ isLoadingMore: false }),
+            },
+          },
+        },
+      },
+    },
+
+    // ─────────────────────────────────────────────────────────────
+    // 非游客会话（**invoke WS** —— "连 WS"业务事实）
+    // chatWebSocket 在 parent 状态 invoke —— 跨 initializing/ready/loadingMore 持续
+    // ─────────────────────────────────────────────────────────────
+    userSession: {
+      initial: "initializing",
       invoke: {
-        src: "chatInit",
-        onDone: {
-          target: "ready",
-          // **条件赋**：仅 isGuest 时初始化配额（业务事实"非游客无消息限制"）
-          //   - 游客：messages + quota 都更新
-          //   - 非游客：仅 messages（local 空），quota 保持 default 0（不更新其值）
-          actions: assign(({ event }) => {
-            const updates: Partial<ChatState> = {
-              messages: event.output.localMessages,
-            };
-            if (event.output.isGuest) {
-              updates.guestRemainingQuota = event.output.guestRemainingQuota;
-              updates.guestTotalQuota = event.output.guestTotalQuota;
-            }
-            return updates;
-          }),
+        src: "chatWebSocket",
+        // event 是触发 userSession 状态的事件（ChatNonGuestLogin from idle / ChatGuestLogin from guestSession）
+        input: ({ event }) => ({
+          token: event.type === "ChatNonGuestLogin" ? event.token : "",
+        }),
+      },
+      states: {
+        initializing: {
+          invoke: {
+            src: "loadMoreHistory",
+            input: ({ context }) => ({ offset: context.historyOffset }),
+            onDone: {
+              target: "ready",
+              actions: assign(({ event }) => ({
+                messages: event.output.messages,
+                isLoadingMore: false,
+                hasMore: event.output.hasMore,
+                historyOffset: event.output.newOffset,
+              })),
+            },
+            onError: {
+              target: "ready",
+              actions: assign({ isLoadingMore: false }),
+            },
+          },
         },
-        onError: {
-          target: "ready",
+        ready: {
+          on: {
+            ChatSendMessage: {
+              guard: ({ event }) => event.content.trim().length > 0,
+              actions: "appendUserMessage",
+            },
+            ChatSendImage: {
+              actions: "appendUserImage",
+            },
+            ChatLoadMoreHistory: "loadingMore",
+            ChatScreenInvisible: "idle", // 屏不可见 → idle（cleanup WS via parent state exit）
+            ChatLogout: "idle", // 登出 → idle（cleanup WS）
+            // 跨态（email → 游客）
+            ChatGuestLogin: "guestSession",
+            ChatAISentenceReceived: {
+              actions: "appendOrUpdateAISentence",
+            },
+            ChatWebSocketError: {
+              actions: "appendSocketErrorMessage",
+            },
+            ChatQuotaExceeded: {
+              actions: "incrementQuotaExceeded",
+            },
+            ChatWebSocketConnected: {},
+          },
+        },
+        loadingMore: {
+          invoke: {
+            src: "loadMoreHistory",
+            input: ({ context }) => ({ offset: context.historyOffset }),
+            onDone: {
+              target: "ready",
+              actions: assign(({ context, event }) => ({
+                messages: [...event.output.messages, ...context.messages],
+                isLoadingMore: false,
+                hasMore: event.output.hasMore,
+                historyOffset: event.output.newOffset,
+              })),
+            },
+            onError: {
+              target: "ready",
+              actions: assign({ isLoadingMore: false }),
+            },
+          },
         },
       },
     },
 
-    ready: {
-      on: {
-        ChatSendMessage: {
-          guard: ({ event }) => event.content.trim().length > 0,
-          actions: "appendUserMessage",
-        },
-        ChatSendImage: {
-          actions: "appendUserImage",
-        },
-        ChatLoadMoreHistory: "loadingMoreHistory",
-        ChatAuthStatusChanged: {
-          actions: "refreshAuthStatus",
-        },
-        ChatAISentenceReceived: {
-          actions: "appendOrUpdateAISentence",
-        },
-        ChatWebSocketError: {
-          actions: "appendSocketErrorMessage",
-        },
-        ChatQuotaExceeded: {
-          actions: "incrementQuotaExceeded",
-        },
-        ChatWebSocketConnected: {},
-      },
-    },
-
+    // ─────────────────────────────────────────────────────────────
+    // 旧 loadingMoreHistory state（兼容 ChatLoadMoreHistory 在 idle 时派的事件）
+    // ─────────────────────────────────────────────────────────────
     loadingMoreHistory: {
       invoke: {
         src: "loadMoreHistory",
@@ -342,6 +486,37 @@ export const chatMachine = setup({
         },
       },
     },
+
+    // ─────────────────────────────────────────────────────────────
+    // 旧 ready state（兼容 ChatScreenVisible 事件）—— **不** invoke WS
+    // （**实际**不会走到这里 —— guestSession.ready / userSession.ready 是真 ready）
+    // ─────────────────────────────────────────────────────────────
+    ready: {
+      on: {
+        ChatSendMessage: {
+          guard: ({ event }) => event.content.trim().length > 0,
+          actions: "appendUserMessage",
+        },
+        ChatSendImage: {
+          actions: "appendUserImage",
+        },
+        ChatLoadMoreHistory: "loadingMoreHistory",
+        ChatScreenInvisible: "idle",
+        ChatLogout: "idle",
+        ChatGuestLogin: "guestSession",
+        ChatNonGuestLogin: "userSession",
+        ChatAISentenceReceived: {
+          actions: "appendOrUpdateAISentence",
+        },
+        ChatWebSocketError: {
+          actions: "appendSocketErrorMessage",
+        },
+        ChatQuotaExceeded: {
+          actions: "incrementQuotaExceeded",
+        },
+        ChatWebSocketConnected: {},
+      },
+    },
   },
 });