Restructure omni services and add Chatwoot research snapshot

research/chatwoot/app/javascript/dashboard/api/channel/voice/twilioVoiceClient.js

@@ -0,0 +1,95 @@
+import { Device } from '@twilio/voice-sdk';
+import VoiceAPI from './voiceAPIClient';
+
+const createCallDisconnectedEvent = () => new CustomEvent('call:disconnected');
+
+class TwilioVoiceClient extends EventTarget {
+  constructor() {
+    super();
+    this.device = null;
+    this.activeConnection = null;
+    this.initialized = false;
+    this.inboxId = null;
+  }
+
+  async initializeDevice(inboxId) {
+    this.destroyDevice();
+
+    const response = await VoiceAPI.getToken(inboxId);
+    const { token, account_id } = response || {};
+    if (!token) throw new Error('Invalid token');
+
+    this.device = new Device(token, {
+      allowIncomingWhileBusy: true,
+      disableAudioContextSounds: true,
+      appParams: { account_id },
+    });
+
+    this.device.removeAllListeners();
+    this.device.on('connect', conn => {
+      this.activeConnection = conn;
+      conn.on('disconnect', this.onDisconnect);
+    });
+
+    this.device.on('disconnect', this.onDisconnect);
+
+    this.device.on('tokenWillExpire', async () => {
+      const r = await VoiceAPI.getToken(this.inboxId);
+      if (r?.token) this.device.updateToken(r.token);
+    });
+
+    this.initialized = true;
+    this.inboxId = inboxId;
+
+    return this.device;
+  }
+
+  get hasActiveConnection() {
+    return !!this.activeConnection;
+  }
+
+  endClientCall() {
+    if (this.activeConnection) {
+      this.activeConnection.disconnect();
+    }
+    this.activeConnection = null;
+    if (this.device) {
+      this.device.disconnectAll();
+    }
+  }
+
+  destroyDevice() {
+    if (this.device) {
+      this.device.destroy();
+    }
+    this.activeConnection = null;
+    this.device = null;
+    this.initialized = false;
+    this.inboxId = null;
+  }
+
+  async joinClientCall({ to, conversationId }) {
+    if (!this.device || !this.initialized || !to) return null;
+    if (this.activeConnection) return this.activeConnection;
+
+    const params = {
+      To: to,
+      is_agent: 'true',
+      conversation_id: conversationId,
+    };
+
+    const connection = await this.device.connect({ params });
+    this.activeConnection = connection;
+
+    connection.on('disconnect', this.onDisconnect);
+
+    return connection;
+  }
+
+  onDisconnect = () => {
+    this.activeConnection = null;
+    this.dispatchEvent(createCallDisconnectedEvent());
+  };
+}
+
+export default new TwilioVoiceClient();