import 'dart:async';
import 'package:twilio_voice/twilio_voice.dart';
import 'api_client.dart';

class VoiceService {
  final ApiClient _api;
  Timer? _tokenRefreshTimer;
  String? _identity;

  final StreamController<CallEvent> _callEventController =
      StreamController<CallEvent>.broadcast();
  Stream<CallEvent> get callEvents => _callEventController.stream;

  VoiceService(this._api);

  Future<void> initialize() async {
    await _fetchAndRegisterToken();

    TwilioVoice.instance.callEventsListener.listen((event) {
      _callEventController.add(event);
    });

    // Refresh token every 50 minutes
    _tokenRefreshTimer?.cancel();
    _tokenRefreshTimer = Timer.periodic(
      const Duration(minutes: 50),
      (_) => _fetchAndRegisterToken(),
    );
  }

  Future<void> _fetchAndRegisterToken() async {
    try {
      final response = await _api.dio.get('/voice/token');
      final data = response.data;
      final token = data['token'] as String;
      _identity = data['identity'] as String;
      await TwilioVoice.instance.setTokens(accessToken: token);
    } catch (e) {
      // Token fetch failed - will retry on next interval
    }
  }

  String? get identity => _identity;

  Future<void> answer() async {
    await TwilioVoice.instance.call.answer();
  }

  Future<void> reject() async {
    await TwilioVoice.instance.call.hangUp();
  }

  Future<void> hangUp() async {
    await TwilioVoice.instance.call.hangUp();
  }

  Future<void> toggleMute(bool mute) async {
    await TwilioVoice.instance.call.toggleMute(mute);
  }

  Future<void> toggleSpeaker(bool speaker) async {
    await TwilioVoice.instance.call.toggleSpeaker(speaker);
  }

  Future<void> sendDigits(String digits) async {
    await TwilioVoice.instance.call.sendDigits(digits);
  }

  Future<void> holdCall(String callSid) async {
    await _api.dio.post('/calls/$callSid/hold');
  }

  Future<void> unholdCall(String callSid) async {
    await _api.dio.post('/calls/$callSid/unhold');
  }

  Future<void> transferCall(String callSid, String target) async {
    await _api.dio.post('/calls/$callSid/transfer', data: {'target': target});
  }

  void dispose() {
    _tokenRefreshTimer?.cancel();
    _callEventController.close();
  }
}