import 'dart:async';
import 'package:flutter/foundation.dart';
import '../models/agent_status.dart';
import '../models/queue_state.dart';
import '../services/api_client.dart';
import '../services/sse_service.dart';

class PhoneNumber {
  final String phoneNumber;
  final String friendlyName;
  PhoneNumber({required this.phoneNumber, required this.friendlyName});
  factory PhoneNumber.fromJson(Map<String, dynamic> json) => PhoneNumber(
    phoneNumber: json['phone_number'] as String,
    friendlyName: json['friendly_name'] as String,
  );
}

class AgentProvider extends ChangeNotifier {
  final ApiClient _api;
  final SseService _sse;

  AgentStatus? _status;
  List<QueueInfo> _queues = [];
  bool _sseConnected = false;
  List<PhoneNumber> _phoneNumbers = [];
  StreamSubscription? _sseSub;
  StreamSubscription? _connSub;

  AgentStatus? get status => _status;
  List<QueueInfo> get queues => _queues;
  bool get sseConnected => _sseConnected;
  List<PhoneNumber> get phoneNumbers => _phoneNumbers;

  AgentProvider(this._api, this._sse) {
    _connSub = _sse.connectionState.listen((connected) {
      _sseConnected = connected;
      notifyListeners();
    });

    _sseSub = _sse.events.listen(_handleSseEvent);
  }

  Future<void> fetchStatus() async {
    try {
      final response = await _api.dio.get('/agent/status');
      _status = AgentStatus.fromJson(response.data);
      notifyListeners();
    } catch (e) { debugPrint('AgentProvider.fetchStatus error: $e'); }
  }

  Future<void> updateStatus(AgentStatusValue newStatus) async {
    final statusStr = newStatus.name;
    try {
      await _api.dio.post('/agent/status', data: {
        'status': statusStr,
        'is_logged_in': true,
      });
      _status = AgentStatus(
        status: newStatus,
        isLoggedIn: true,
        currentCallSid: _status?.currentCallSid,
      );
      notifyListeners();
    } catch (e) { debugPrint('AgentProvider.updateStatus error: $e'); }
  }

  Future<void> fetchQueues() async {
    try {
      final response = await _api.dio.get('/queues/state');
      final data = response.data;
      _queues = (data['queues'] as List)
          .map((q) => QueueInfo.fromJson(q as Map<String, dynamic>))
          .toList();
      notifyListeners();
    } catch (e) { debugPrint('AgentProvider.fetchQueues error: $e'); }
  }

  Future<void> fetchPhoneNumbers() async {
    try {
      final response = await _api.dio.get('/phone-numbers');
      final data = response.data;
      _phoneNumbers = (data['phone_numbers'] as List)
          .map((p) => PhoneNumber.fromJson(p as Map<String, dynamic>))
          .toList();
      notifyListeners();
    } catch (e) {
      debugPrint('AgentProvider.fetchPhoneNumbers error: $e');
    }
  }

  Future<void> refresh() async {
    await Future.wait([fetchStatus(), fetchQueues(), fetchPhoneNumbers()]);
  }

  void _handleSseEvent(SseEvent event) {
    switch (event.event) {
      case 'call_enqueued':
      case 'call_dequeued':
        fetchQueues();
        break;
      case 'agent_status_changed':
        fetchStatus();
        break;
    }
  }

  @override
  void dispose() {
    _sseSub?.cancel();
    _connSub?.cancel();
    super.dispose();
  }
}