refactor(chat): split machine and repository flows

src/data/repositories/chat_local_message_store.ts

@@ -0,0 +1,108 @@
+"use client";
+
+import type { ChatLockDetailData } from "@/data/schemas/chat";
+import { ChatMessage } from "@/data/dto/chat";
+import { LocalChatStorage, LocalMessage } from "@/data/storage/chat";
+import { Result } from "@/utils";
+
+export class ChatLocalMessageStore {
+  constructor(private readonly localStorage: LocalChatStorage) {}
+
+  async markMessageUnlocked(
+    messageId: string,
+    content: string,
+    lockDetail?: ChatLockDetailData,
+  ): Promise<Result<void>> {
+    return Result.wrap(async () => {
+      const localResult = await this.getMessages();
+      if (Result.isErr(localResult)) {
+        throw localResult.error;
+      }
+
+      let changed = false;
+      const updatedMessages = localResult.data.map((message) => {
+        if (message.id !== messageId) return message;
+        changed = true;
+        return ChatMessage.from({
+          ...message.toJson(),
+          content,
+          lockDetail: lockDetail ?? {
+            ...message.lockDetail,
+            locked: false,
+            showContent: true,
+            showUpgrade: false,
+            reason: null,
+            hint: null,
+            detail: null,
+          },
+        });
+      });
+
+      if (!changed) return;
+
+      const saveResult = await this.saveMessages(updatedMessages);
+      if (Result.isErr(saveResult)) {
+        throw saveResult.error;
+      }
+    });
+  }
+
+  async saveMessage(message: ChatMessage): Promise<Result<void>> {
+    return this.localStorage.saveMessage(this._chatToLocal(message));
+  }
+
+  async saveMessages(
+    messages: readonly ChatMessage[],
+  ): Promise<Result<void>> {
+    const cleared = await this.localStorage.clearAll();
+    if (!cleared.success) {
+      return Result.err(cleared.error);
+    }
+    return this.localStorage.saveMessages(
+      messages.map((message) => this._chatToLocal(message)),
+    );
+  }
+
+  async getMessages(): Promise<Result<ChatMessage[]>> {
+    const result = await this.localStorage.getAllMessages();
+    if (!result.success) {
+      return Result.err(result.error);
+    }
+    return Result.ok(result.data.map((message) => this._localToChat(message)));
+  }
+
+  async clearMessages(): Promise<Result<void>> {
+    return this.localStorage.clearAll();
+  }
+
+  async getMessageCount(): Promise<Result<number>> {
+    return this.localStorage.getMessageCount();
+  }
+
+  private _chatToLocal(message: ChatMessage): LocalMessage {
+    return LocalMessage.from({
+      id: message.id,
+      role: message.role,
+      type: message.type,
+      content: message.content,
+      createdAt: message.createdAt,
+      audioUrl: message.audioUrl,
+      image: message.image,
+      lockDetail: message.lockDetail,
+      sessionId: "",
+    });
+  }
+
+  private _localToChat(local: LocalMessage): ChatMessage {
+    return ChatMessage.from({
+      id: local.id,
+      role: local.role,
+      type: local.type,
+      content: local.content,
+      createdAt: local.createdAt,
+      audioUrl: local.audioUrl,
+      image: local.image,
+      lockDetail: local.lockDetail,
+    });
+  }
+}

src/data/repositories/chat_media_cache_coordinator.ts

@@ -0,0 +1,169 @@
+"use client";
+
+import type { ChatMessage, ChatSendResponse } from "@/data/dto/chat";
+import {
+  LocalChatMediaStorage,
+  type LocalChatMediaRow,
+} from "@/data/storage/chat";
+import { AuthStorage } from "@/data/storage/auth";
+import { UserStorage } from "@/data/storage/user/user_storage";
+import { requestBrowserPersistentStorageOnce } from "@/lib/browser/persistent_storage";
+import { Logger, Result } from "@/utils";
+import type {
+  CacheRemoteChatMediaInput,
+  ChatMediaLookupInput,
+} from "@/data/repositories/interfaces";
+
+import {
+  buildChatMediaCacheKey,
+  fallbackChatMediaMimeType,
+  getMessageMediaTargets,
+  getSendResponseMediaTargets,
+  isCacheableRemoteChatMediaUrl,
+  uniqueMediaTargets,
+} from "./chat_media_cache_helpers";
+
+const log = new Logger("DataRepositoriesChatMediaCacheCoordinator");
+
+export class ChatMediaCacheCoordinator {
+  constructor(private readonly mediaStorage: LocalChatMediaStorage) {}
+
+  async getCachedMedia(
+    input: ChatMediaLookupInput,
+  ): Promise<Result<LocalChatMediaRow | null>> {
+    return Result.wrap(async () => {
+      const ownerKeys = await this._resolveMediaOwnerKeys();
+      for (const ownerKey of ownerKeys) {
+        const cacheKey = this._buildMediaCacheKey(ownerKey, input);
+        const result = await this.mediaStorage.getMedia(cacheKey);
+        if (Result.isErr(result)) throw result.error;
+        if (result.data) return result.data;
+      }
+      return null;
+    });
+  }
+
+  async cacheRemoteMedia(
+    input: CacheRemoteChatMediaInput,
+  ): Promise<Result<LocalChatMediaRow>> {
+    return Result.wrap(async () => {
+      if (!isCacheableRemoteChatMediaUrl(input.remoteUrl)) {
+        throw new Error(`Unsupported media url: ${input.remoteUrl}`);
+      }
+
+      const ownerKeys = await this._resolveMediaOwnerKeys();
+      const ownerKey = ownerKeys[0] ?? "anonymous";
+      const cacheKey = this._buildMediaCacheKey(ownerKey, input);
+      for (const lookupOwnerKey of ownerKeys) {
+        const lookupCacheKey = this._buildMediaCacheKey(lookupOwnerKey, input);
+        const existingResult = await this.mediaStorage.getMedia(lookupCacheKey);
+        if (Result.isErr(existingResult)) throw existingResult.error;
+        if (existingResult.data) return existingResult.data;
+      }
+
+      const response = await fetch(input.remoteUrl, {
+        method: "GET",
+        cache: "force-cache",
+      });
+      if (!response.ok) {
+        throw new Error(
+          `Media download failed: ${response.status} ${response.statusText}`,
+        );
+      }
+
+      const blob = await response.blob();
+      if (blob.size <= 0) {
+        throw new Error("Media download returned an empty blob.");
+      }
+
+      const saveResult = await this.mediaStorage.saveMedia({
+        cacheKey,
+        ownerKey,
+        messageId: input.messageId,
+        kind: input.kind,
+        remoteUrl: input.remoteUrl,
+        blob,
+        mimeType:
+          blob.type ||
+          response.headers.get("content-type") ||
+          fallbackChatMediaMimeType(input.kind),
+      });
+      if (Result.isErr(saveResult)) throw saveResult.error;
+      void requestBrowserPersistentStorageOnce();
+
+      const savedResult = await this.mediaStorage.getMedia(cacheKey);
+      if (Result.isErr(savedResult)) throw savedResult.error;
+      if (!savedResult.data) {
+        throw new Error("Cached media could not be read after save.");
+      }
+      return savedResult.data;
+    });
+  }
+
+  async prefetchMediaForMessages(
+    messages: readonly ChatMessage[],
+  ): Promise<Result<void>> {
+    return this._prefetchMediaTargets(
+      messages.flatMap((message) => getMessageMediaTargets(message)),
+    );
+  }
+
+  async prefetchMediaForSendResponse(
+    response: ChatSendResponse,
+  ): Promise<Result<void>> {
+    return this._prefetchMediaTargets(getSendResponseMediaTargets(response));
+  }
+
+  private async _prefetchMediaTargets(
+    targets: readonly CacheRemoteChatMediaInput[],
+  ): Promise<Result<void>> {
+    return Result.wrap(async () => {
+      for (const target of uniqueMediaTargets(targets)) {
+        const result = await this.cacheRemoteMedia(target);
+        if (Result.isErr(result)) {
+          log.warn("[chat-media] prefetch failed", {
+            messageId: target.messageId,
+            kind: target.kind,
+            remoteUrl: target.remoteUrl,
+            error: result.error,
+          });
+        }
+      }
+    });
+  }
+
+  private async _resolveMediaOwnerKeys(): Promise<string[]> {
+    const ownerKeys: string[] = [];
+    const userIdResult = await UserStorage.getInstance().getUserId();
+    if (
+      Result.isOk(userIdResult) &&
+      userIdResult.data !== null &&
+      userIdResult.data.length > 0
+    ) {
+      ownerKeys.push(`user:${userIdResult.data}`);
+    }
+
+    const deviceIdResult = await AuthStorage.getInstance().getDeviceId();
+    if (
+      Result.isOk(deviceIdResult) &&
+      deviceIdResult.data !== null &&
+      deviceIdResult.data.length > 0
+    ) {
+      ownerKeys.push(`device:${deviceIdResult.data}`);
+    }
+
+    ownerKeys.push("anonymous");
+    return Array.from(new Set(ownerKeys));
+  }
+
+  private _buildMediaCacheKey(
+    ownerKey: string,
+    input: ChatMediaLookupInput,
+  ): string {
+    return buildChatMediaCacheKey({
+      ownerKey,
+      messageId: input.messageId,
+      kind: input.kind,
+    });
+  }
+}

src/data/repositories/chat_remote_data_source.ts

@@ -0,0 +1,49 @@
+"use client";
+
+import {
+  ChatHistoryResponse,
+  ChatSendResponse,
+  SendMessageRequest,
+  UnlockHistoryResponse,
+  UnlockPrivateRequest,
+  UnlockPrivateResponse,
+} from "@/data/dto/chat";
+import type { ChatApi } from "@/data/services/api";
+import { Result } from "@/utils";
+
+export class ChatRemoteDataSource {
+  constructor(private readonly api: ChatApi) {}
+
+  async sendMessage(
+    message: string,
+    options?: { image?: string; useWebSocket?: boolean },
+  ): Promise<Result<ChatSendResponse>> {
+    return Result.wrap(async () => {
+      const request = SendMessageRequest.from({
+        message,
+        image: options?.image ?? "",
+        useWebSocket: options?.useWebSocket ?? false,
+      });
+      return await this.api.sendMessage(request);
+    });
+  }
+
+  async getHistory(
+    limit = 50,
+    offset = 0,
+  ): Promise<Result<ChatHistoryResponse>> {
+    return Result.wrap(() => this.api.getHistory(limit, offset));
+  }
+
+  async unlockPrivateMessage(
+    messageId: string,
+  ): Promise<Result<UnlockPrivateResponse>> {
+    return Result.wrap(() =>
+      this.api.unlockPrivateMessage(UnlockPrivateRequest.from({ messageId })),
+    );
+  }
+
+  async unlockHistory(): Promise<Result<UnlockHistoryResponse>> {
+    return Result.wrap(() => this.api.unlockHistory());
+  }
+}

src/data/repositories/chat_repository.ts

@@ -1,48 +1,36 @@
 "use client";
 
-import { ChatApi, chatApi } from "@/data/services/api";
-import {
+import type {
   ChatHistoryResponse,
   ChatMessage,
   ChatSendResponse,
-  SendMessageRequest,
   UnlockHistoryResponse,
-  UnlockPrivateRequest,
   UnlockPrivateResponse,
 } from "@/data/dto/chat";
 import type { ChatLockDetailData } from "@/data/schemas/chat";
-import { AuthStorage } from "@/data/storage/auth";
-import { UserStorage } from "@/data/storage/user/user_storage";
-import { Logger, Result } from "@/utils";
+import { chatApi } from "@/data/services/api";
+import {
+  LocalChatMediaStorage,
+  LocalChatStorage,
+  type LocalChatMediaRow,
+} from "@/data/storage/chat";
 import type {
   CacheRemoteChatMediaInput,
   ChatMediaLookupInput,
   IChatRepository,
 } from "@/data/repositories/interfaces";
-import {
-  LocalChatMediaStorage,
-  LocalChatStorage,
-  LocalMessage,
-  type LocalChatMediaRow,
-} from "@/data/storage/chat";
-import {
-  buildChatMediaCacheKey,
-  fallbackChatMediaMimeType,
-  getMessageMediaTargets,
-  getSendResponseMediaTargets,
-  isCacheableRemoteChatMediaUrl,
-  uniqueMediaTargets,
-} from "./chat_media_cache_helpers";
-import { createLazySingleton } from "./lazy_singleton";
-import { requestBrowserPersistentStorageOnce } from "@/lib/browser/persistent_storage";
+import type { Result } from "@/utils";
 
-const log = new Logger("DataRepositoriesChatRepository");
+import { ChatLocalMessageStore } from "./chat_local_message_store";
+import { ChatMediaCacheCoordinator } from "./chat_media_cache_coordinator";
+import { ChatRemoteDataSource } from "./chat_remote_data_source";
+import { createLazySingleton } from "./lazy_singleton";
 
 export class ChatRepository implements IChatRepository {
   constructor(
-    private readonly api: ChatApi,
-    private readonly localStorage: LocalChatStorage,
-    private readonly mediaStorage: LocalChatMediaStorage,
+    private readonly remote: ChatRemoteDataSource,
+    private readonly localMessages: ChatLocalMessageStore,
+    private readonly mediaCache: ChatMediaCacheCoordinator,
   ) {}
 
   // ============ 远程操作 ============
@@ -52,14 +40,7 @@ export class ChatRepository implements IChatRepository {
     message: string,
     options?: { image?: string; useWebSocket?: boolean },
   ): Promise<Result<ChatSendResponse>> {
-    return Result.wrap(async () => {
-      const request = SendMessageRequest.from({
-        message,
-        image: options?.image ?? "",
-        useWebSocket: options?.useWebSocket ?? false,
-      });
-      return await this.api.sendMessage(request);
-    });
+    return this.remote.sendMessage(message, options);
   }
 
   /** 获取聊天历史，分页参数默认 limit=50, offset=0。 */
@@ -67,21 +48,19 @@ export class ChatRepository implements IChatRepository {
     limit = 50,
     offset = 0,
   ): Promise<Result<ChatHistoryResponse>> {
-    return Result.wrap(() => this.api.getHistory(limit, offset));
+    return this.remote.getHistory(limit, offset);
   }
 
   /** 解锁单条历史付费 / 私密消息。 */
   async unlockPrivateMessage(
     messageId: string,
   ): Promise<Result<UnlockPrivateResponse>> {
-    return Result.wrap(() =>
-      this.api.unlockPrivateMessage(UnlockPrivateRequest.from({ messageId })),
-    );
+    return this.remote.unlockPrivateMessage(messageId);
   }
 
   /** 一键解锁历史锁定消息。 */
   async unlockHistory(): Promise<Result<UnlockHistoryResponse>> {
-    return Result.wrap(() => this.api.unlockHistory());
+    return this.remote.unlockHistory();
   }
 
   /** 把本地缓存中的单条锁定消息标记为已解锁。 */
@@ -90,47 +69,18 @@ export class ChatRepository implements IChatRepository {
     content: string,
     lockDetail?: ChatLockDetailData,
   ): Promise<Result<void>> {
-    return Result.wrap(async () => {
-      const localResult = await this.getLocalMessages();
-      if (Result.isErr(localResult)) {
-        throw localResult.error;
-      }
-
-      let changed = false;
-      const updatedMessages = localResult.data.map((message) => {
-        if (message.id !== messageId) return message;
-        changed = true;
-        return ChatMessage.from({
-          ...message.toJson(),
-          content,
-          lockDetail: lockDetail ?? {
-            ...message.lockDetail,
-            locked: false,
-            showContent: true,
-            showUpgrade: false,
-            reason: null,
-            hint: null,
-            detail: null,
-          },
-        });
-      });
-
-      if (!changed) return;
-
-      const saveResult = await this.saveMessagesToLocal(updatedMessages);
-      if (Result.isErr(saveResult)) {
-        throw saveResult.error;
-      }
-    });
+    return this.localMessages.markMessageUnlocked(
+      messageId,
+      content,
+      lockDetail,
+    );
   }
 
   // ============ 本地（Dexie）操作 ============
 
   /** 把一条消息写入本地存储。 */
   async saveMessageToLocal(message: ChatMessage): Promise<Result<void>> {
-    return this._mapLocalStorageResult(
-      this.localStorage.saveMessage(this._chatToLocal(message)),
-    );
+    return this.localMessages.saveMessage(message);
   }
 
   /**
@@ -140,27 +90,17 @@ export class ChatRepository implements IChatRepository {
   async saveMessagesToLocal(
     messages: readonly ChatMessage[],
   ): Promise<Result<void>> {
-    const cleared = await this.localStorage.clearAll();
-    if (!cleared.success) {
-      return Result.err(cleared.error);
-    }
-    return this._mapLocalStorageResult(
-      this.localStorage.saveMessages(messages.map((m) => this._chatToLocal(m))),
-    );
+    return this.localMessages.saveMessages(messages);
   }
 
   /** 读取所有本地消息，按 dbId 升序。 */
   async getLocalMessages(): Promise<Result<ChatMessage[]>> {
-    const result = await this.localStorage.getAllMessages();
-    if (!result.success) {
-      return Result.err(result.error);
-    }
-    return Result.ok(result.data.map((lm) => this._localToChat(lm)));
+    return this.localMessages.getMessages();
   }
 
   /** 清空本地消息。 */
   async clearLocalMessages(): Promise<Result<void>> {
-    return this._mapLocalStorageResult(this.localStorage.clearAll());
+    return this.localMessages.clearMessages();
   }
 
   /**
@@ -168,7 +108,7 @@ export class ChatRepository implements IChatRepository {
    * 替代 Dart 的同步 `int get localMessageCount`——Dexie 异步 API 决定必须 async。
    */
   async getLocalMessageCount(): Promise<Result<number>> {
-    return this._mapLocalStorageResult(this.localStorage.getMessageCount());
+    return this.localMessages.getMessageCount();
   }
 
   // ============ 本地媒体缓存 ============
@@ -176,182 +116,25 @@ export class ChatRepository implements IChatRepository {
   async getCachedMedia(
     input: ChatMediaLookupInput,
   ): Promise<Result<LocalChatMediaRow | null>> {
-    return Result.wrap(async () => {
-      const ownerKeys = await this._resolveMediaOwnerKeys();
-      for (const ownerKey of ownerKeys) {
-        const cacheKey = this._buildMediaCacheKey(ownerKey, input);
-        const result = await this.mediaStorage.getMedia(cacheKey);
-        if (Result.isErr(result)) throw result.error;
-        if (result.data) return result.data;
-      }
-      return null;
-    });
+    return this.mediaCache.getCachedMedia(input);
   }
 
   async cacheRemoteMedia(
     input: CacheRemoteChatMediaInput,
   ): Promise<Result<LocalChatMediaRow>> {
-    return Result.wrap(async () => {
-      if (!isCacheableRemoteChatMediaUrl(input.remoteUrl)) {
-        throw new Error(`Unsupported media url: ${input.remoteUrl}`);
-      }
-
-      const ownerKeys = await this._resolveMediaOwnerKeys();
-      const ownerKey = ownerKeys[0] ?? "anonymous";
-      const cacheKey = this._buildMediaCacheKey(ownerKey, input);
-      for (const lookupOwnerKey of ownerKeys) {
-        const lookupCacheKey = this._buildMediaCacheKey(lookupOwnerKey, input);
-        const existingResult = await this.mediaStorage.getMedia(lookupCacheKey);
-        if (Result.isErr(existingResult)) throw existingResult.error;
-        if (existingResult.data) return existingResult.data;
-      }
-
-      const response = await fetch(input.remoteUrl, {
-        method: "GET",
-        cache: "force-cache",
-      });
-      if (!response.ok) {
-        throw new Error(
-          `Media download failed: ${response.status} ${response.statusText}`,
-        );
-      }
-
-      const blob = await response.blob();
-      if (blob.size <= 0) {
-        throw new Error("Media download returned an empty blob.");
-      }
-
-      const saveResult = await this.mediaStorage.saveMedia({
-        cacheKey,
-        ownerKey,
-        messageId: input.messageId,
-        kind: input.kind,
-        remoteUrl: input.remoteUrl,
-        blob,
-        mimeType:
-          blob.type ||
-          response.headers.get("content-type") ||
-          fallbackChatMediaMimeType(input.kind),
-      });
-      if (Result.isErr(saveResult)) throw saveResult.error;
-      void requestBrowserPersistentStorageOnce();
-
-      const savedResult = await this.mediaStorage.getMedia(cacheKey);
-      if (Result.isErr(savedResult)) throw savedResult.error;
-      if (!savedResult.data) {
-        throw new Error("Cached media could not be read after save.");
-      }
-      return savedResult.data;
-    });
+    return this.mediaCache.cacheRemoteMedia(input);
   }
 
   async prefetchMediaForMessages(
     messages: readonly ChatMessage[],
   ): Promise<Result<void>> {
-    return this._prefetchMediaTargets(
-      messages.flatMap((message) => getMessageMediaTargets(message)),
-    );
+    return this.mediaCache.prefetchMediaForMessages(messages);
   }
 
   async prefetchMediaForSendResponse(
     response: ChatSendResponse,
   ): Promise<Result<void>> {
-    return this._prefetchMediaTargets(getSendResponseMediaTargets(response));
-  }
-
-  // ============ 私有助手 ============
-
-  /** ChatMessage → LocalMessage：丢弃 wire 字段，注入 storage 层的 sessionId=""。 */
-  private _chatToLocal(message: ChatMessage): LocalMessage {
-    return LocalMessage.from({
-      id: message.id,
-      role: message.role,
-      type: message.type,
-      content: message.content,
-      createdAt: message.createdAt,
-      audioUrl: message.audioUrl,
-      image: message.image,
-      lockDetail: message.lockDetail,
-      sessionId: "",
-    });
-  }
-
-  /** LocalMessage → ChatMessage：丢弃 storage 层的 sessionId。 */
-  private _localToChat(local: LocalMessage): ChatMessage {
-    return ChatMessage.from({
-      id: local.id,
-      role: local.role,
-      type: local.type,
-      content: local.content,
-      createdAt: local.createdAt,
-      audioUrl: local.audioUrl,
-      image: local.image,
-      lockDetail: local.lockDetail,
-    });
-  }
-
-  /**
-   * 把 storage 层 `Result<T>` 透传：仓库与 storage 现在共享同一全局
-   * `Result<T>`（来自 `@/utils/result`），不需要任何形状转换。
-   * 该方法保留仅为未来万一又出现差异化时方便快速插入适配。
-   */
-  private async _mapLocalStorageResult<T>(
-    promise: Promise<Result<T>>,
-  ): Promise<Result<T>> {
-    return await promise;
-  }
-
-  private async _prefetchMediaTargets(
-    targets: readonly CacheRemoteChatMediaInput[],
-  ): Promise<Result<void>> {
-    return Result.wrap(async () => {
-      for (const target of uniqueMediaTargets(targets)) {
-        const result = await this.cacheRemoteMedia(target);
-        if (Result.isErr(result)) {
-          log.warn("[chat-media] prefetch failed", {
-            messageId: target.messageId,
-            kind: target.kind,
-            remoteUrl: target.remoteUrl,
-            error: result.error,
-          });
-        }
-      }
-    });
-  }
-
-  private async _resolveMediaOwnerKeys(): Promise<string[]> {
-    const ownerKeys: string[] = [];
-    const userIdResult = await UserStorage.getInstance().getUserId();
-    if (
-      Result.isOk(userIdResult) &&
-      userIdResult.data !== null &&
-      userIdResult.data.length > 0
-    ) {
-      ownerKeys.push(`user:${userIdResult.data}`);
-    }
-
-    const deviceIdResult = await AuthStorage.getInstance().getDeviceId();
-    if (
-      Result.isOk(deviceIdResult) &&
-      deviceIdResult.data !== null &&
-      deviceIdResult.data.length > 0
-    ) {
-      ownerKeys.push(`device:${deviceIdResult.data}`);
-    }
-
-    ownerKeys.push("anonymous");
-    return Array.from(new Set(ownerKeys));
-  }
-
-  private _buildMediaCacheKey(
-    ownerKey: string,
-    input: ChatMediaLookupInput,
-  ): string {
-    return buildChatMediaCacheKey({
-      ownerKey,
-      messageId: input.messageId,
-      kind: input.kind,
-    });
+    return this.mediaCache.prefetchMediaForSendResponse(response);
   }
 }
 
@@ -359,8 +142,8 @@ export class ChatRepository implements IChatRepository {
 export const getChatRepository = createLazySingleton<IChatRepository>(
   () =>
     new ChatRepository(
-      chatApi,
-      LocalChatStorage.getInstance(),
-      LocalChatMediaStorage.getInstance(),
+      new ChatRemoteDataSource(chatApi),
+      new ChatLocalMessageStore(LocalChatStorage.getInstance()),
+      new ChatMediaCacheCoordinator(LocalChatMediaStorage.getInstance()),
     ),
 );