// Shim do socketService do motor sobre o túnel WS do satélite
// (/api/nw/v1/stream?token=). Traduz os eventos do ext stream para os nomes que
// as páginas do motor escutam. joinInstance/joinChat/leaveChat são no-ops: o
// stream já é do tenant inteiro; as páginas filtram por instanceId/chatId no
// cliente. Mantém a MESMA interface do services/socketService.ts do motor.
import { nw, nwToken } from './nwClient';

type Listener = (data: any) => void;

// ext status (minúsculo) → enum do motor (maiúsculo).
function normStatus(s: string): string {
  const m: Record<string, string> = {
    connected: 'CONNECTED', disconnected: 'DISCONNECTED',
    connecting: 'CONNECTING', qr: 'QR_PENDING', banned: 'BANNED',
  };
  return m[String(s).toLowerCase()] ?? String(s).toUpperCase();
}

class SocketShim {
  private ws: WebSocket | null = null;
  private listeners = new Map<string, Set<Listener>>();
  private retry: ReturnType<typeof setTimeout> | null = null;
  private closedByUser = false;

  connect(_token?: string) {
    if (this.ws && (this.ws.readyState === WebSocket.OPEN || this.ws.readyState === WebSocket.CONNECTING)) return;
    this.closedByUser = false;
    const token = nwToken();
    if (!token) return;
    const base = nw.base();
    const abs = base.startsWith('http') ? base : `${window.location.origin}${base}`;
    let u: URL;
    try { u = new URL(`${abs}/nw/v1/stream`); } catch { return; }
    u.protocol = u.protocol === 'https:' ? 'wss:' : 'ws:';
    u.searchParams.set('token', token);

    let ws: WebSocket;
    try { ws = new WebSocket(u.toString()); } catch { return; }
    this.ws = ws;

    ws.onopen = () => this._emit('connected', { id: 'nw' });
    ws.onerror = () => { try { ws.close(); } catch { /* ignore */ } };
    ws.onclose = () => {
      this._emit('disconnected', {});
      if (!this.closedByUser) this.retry = setTimeout(() => this.connect(), 3000);
    };
    ws.onmessage = (ev) => {
      let env: any;
      try { env = JSON.parse(ev.data); } catch { return; }
      const { event, data } = env || {};
      if (!event) return;
      switch (event) {
        case 'session.status':
          this._emit('instance:status', { instanceId: data?.instanceId, status: normStatus(data?.status) });
          break;
        case 'session.qr':
          this._emit('qr', { instanceId: data?.instanceId, qrBase64: data?.qrBase64 });
          break;
        case 'message.new': {
          // ext envia { instanceId, chatId, message, timestamp }; o chatStore
          // espera o objeto de mensagem direto (com chatId).
          // OBS: o motor também emite ext:message.new numa variante SEM `message`
          // (só { jid, text }) para acionar a Secretária IA — ignoramos aqui,
          // senão o chatStore sobrescreve o preview do chat com undefined.
          if (!data?.message) break;
          const m = { ...data.message, chatId: data.message.chatId ?? data.chatId };
          this._emit('message:new', m);
          break;
        }
        case 'message.update': {
          const m = data?.message ?? data;
          if (m?.messageId && m?.status) this._emit('message:status', { messageId: m.messageId, status: m.status });
          this._emit('message:update', m);
          break;
        }
        case 'conversation.handoff':   this._emit('handoff', data); break;
        case 'conversation.escalated': this._emit('escalated', data); break;
        default: break;
      }
      this._emit('*', { event, data });
    };
  }

  disconnect() {
    this.closedByUser = true;
    if (this.retry) clearTimeout(this.retry);
    try { this.ws?.close(); } catch { /* ignore */ }
    this.ws = null;
  }

  // Satélite não envia comandos pelo stream (é read-only); mantidos p/ compat.
  emit(_event: string, ..._args: any[]) { /* no-op */ }
  joinInstance(_instanceId: string) { /* no-op — stream é tenant-wide */ }
  joinChat(_chatId: string) { /* no-op */ }
  leaveChat(_chatId: string) { /* no-op */ }

  on(event: string, cb: Listener) {
    if (!this.listeners.has(event)) this.listeners.set(event, new Set());
    this.listeners.get(event)!.add(cb);
  }
  off(event: string, cb: Listener) { this.listeners.get(event)?.delete(cb); }

  get connected() { return this.ws?.readyState === WebSocket.OPEN; }
  getSocket() { return this.ws; }

  private _emit(event: string, data: any) {
    this.listeners.get(event)?.forEach((cb) => { try { cb(data); } catch { /* ignore */ } });
  }
}

export const socketService = new SocketShim();