Reorganize modules into layered directories

sync/bme-chat-manager.js

@@ -0,0 +1,89 @@
+import { BmeDatabase } from "./bme-db.js";
+
+function normalizeChatId(chatId) {
+  return String(chatId ?? "").trim();
+}
+
+export class BmeChatManager {
+  constructor(options = {}) {
+    this.options = options;
+    this._currentChatId = "";
+    this._dbByChatId = new Map();
+
+    this._databaseFactory =
+      typeof options.databaseFactory === "function"
+        ? options.databaseFactory
+        : (chatId) => new BmeDatabase(chatId, options.databaseOptions || {});
+  }
+
+  async switchChat(chatId) {
+    const normalizedChatId = normalizeChatId(chatId);
+
+    if (!normalizedChatId) {
+      await this.closeCurrent();
+      this._currentChatId = "";
+      return null;
+    }
+
+    this._currentChatId = normalizedChatId;
+    return await this.getCurrentDb(normalizedChatId);
+  }
+
+  async getCurrentDb(chatId = this._currentChatId) {
+    const normalizedChatId = normalizeChatId(chatId);
+    if (!normalizedChatId) {
+      return null;
+    }
+
+    if (this._currentChatId !== normalizedChatId) {
+      this._currentChatId = normalizedChatId;
+    }
+
+    let db = this._dbByChatId.get(normalizedChatId);
+    if (!db) {
+      db = this._databaseFactory(normalizedChatId);
+      if (!db || typeof db.open !== "function") {
+        throw new Error("BmeChatManager: databaseFactory 必须返回可 open() 的实例");
+      }
+      this._dbByChatId.set(normalizedChatId, db);
+    }
+
+    await db.open();
+    return db;
+  }
+
+  getCurrentChatId() {
+    return this._currentChatId;
+  }
+
+  async closeCurrent() {
+    const chatId = this._currentChatId;
+    if (!chatId) {
+      return;
+    }
+
+    const db = this._dbByChatId.get(chatId);
+    if (db && typeof db.close === "function") {
+      await db.close();
+    }
+
+    this._dbByChatId.delete(chatId);
+    this._currentChatId = "";
+  }
+
+  async closeAll() {
+    const dbInstances = Array.from(this._dbByChatId.values());
+
+    for (const db of dbInstances) {
+      if (!db || typeof db.close !== "function") continue;
+      try {
+        await db.close();
+      } catch (error) {
+        console.warn("[ST-BME] 关闭 BME chat 数据库失败:", error);
+      }
+    }
+
+    this._dbByChatId.clear();
+    this._currentChatId = "";
+  }
+}