school-attendance/lib/function/teacher_location_controller.dart

// 📍 선생님 위치 등록(교사용) 화면의 기능(서버 통신/상태) 담당 컨트롤러.
import 'dart:convert';
import 'package:flutter/foundation.dart';
import 'package:http/http.dart' as http;
import '../config.dart';

class TeacherLocationController extends ChangeNotifier {
  final String teacherId;

  TeacherLocationController({required this.teacherId});

  bool _isLoading = true;
  bool _isSaving = false;
  String _currentLocation = "교무실";
  List<dynamic> _receivedCalls = [];
  bool _disposed = false;

  bool get isLoading => _isLoading;
  bool get isSaving => _isSaving;
  String get currentLocation => _currentLocation;
  List<dynamic> get receivedCalls => _receivedCalls;

  void _safeNotify() {
    if (!_disposed) notifyListeners();
  }

  @override
  void dispose() {
    _disposed = true;
    super.dispose();
  }

  Future<void> init() async {
    await Future.wait([_fetchMyLocation(), fetchReceivedCalls()]);
    _isLoading = false;
    _safeNotify();
  }

  Future<void> _fetchMyLocation() async {
    try {
      final response = await http.get(
        Uri.parse('$baseUrl/api/teacher-call/teachers'),
      );
      if (response.statusCode == 200) {
        final data = jsonDecode(utf8.decode(response.bodyBytes));
        final List<dynamic> list = data['teachers'] ?? [];
        final mine = list.firstWhere(
          (t) => t['teacherId'] == teacherId,
          orElse: () => null,
        );
        if (mine != null) _currentLocation = mine['location'] ?? '교무실';
      }
    } catch (_) {
      // 조용히 무시
    }
  }

  Future<void> fetchReceivedCalls() async {
    try {
      final response = await http.get(
        Uri.parse(
          '$baseUrl/api/teacher-call/received-calls?teacherId=$teacherId',
        ),
      );
      if (response.statusCode == 200) {
        final data = jsonDecode(utf8.decode(response.bodyBytes));
        _receivedCalls = data['calls'] ?? [];
        _safeNotify();
      }
    } catch (_) {
      // 조용히 무시
    }
  }

  Future<(bool success, String message)> updateLocation(String location) async {
    _isSaving = true;
    _safeNotify();
    try {
      final response = await http.post(
        Uri.parse('$baseUrl/api/teacher-call/location'),
        headers: {"Content-Type": "application/json"},
        body: jsonEncode({"teacherId": teacherId, "location": location}),
      );
      final result = jsonDecode(utf8.decode(response.bodyBytes));
      if (response.statusCode == 200 && result['status'] == 'success') {
        _currentLocation = location;
        return (true, '${result['message'] ?? '위치가 업데이트되었습니다.'}');
      }
      return (false, '${result['message'] ?? '업데이트 실패'}');
    } catch (e) {
      return (false, '네트워크 에러: $e');
    } finally {
      _isSaving = false;
      _safeNotify();
    }
  }
}