// 👥 백품타 그룹 상세(멤버/오늘 출석/초대/나가기) 화면의 기능 담당 컨트롤러.
import 'dart:convert';
import 'package:flutter/foundation.dart';
import 'package:http/http.dart' as http;
import '../config.dart';

class GroupDetailController extends ChangeNotifier {
  final int groupId;
  final String studentId;

  GroupDetailController({required this.groupId, required this.studentId});

  bool _isLoading = true;
  bool _isBusy = false;
  List<dynamic> _members = [];
  bool _disposed = false;

  bool get isLoading => _isLoading;
  bool get isBusy => _isBusy;
  List<dynamic> get members => _members;

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

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

  Future<void> init() => refresh();

  Future<void> refresh() async {
    _isLoading = true;
    _safeNotify();
    try {
      final response = await http.get(
        Uri.parse('$baseUrl/api/groups/$groupId/members'),
      );
      if (response.statusCode == 200) {
        final data = jsonDecode(utf8.decode(response.bodyBytes));
        _members = data['members'] ?? [];
      }
    } catch (_) {
      // 조용히 무시
    } finally {
      _isLoading = false;
      _safeNotify();
    }
  }

  Future<(bool success, String message)> invite(
    String inviteeId,
    String inviteeName,
  ) async {
    _isBusy = true;
    _safeNotify();
    try {
      final response = await http.post(
        Uri.parse('$baseUrl/api/groups/$groupId/invite'),
        headers: {"Content-Type": "application/json"},
        body: jsonEncode({
          "inviterId": studentId,
          "inviteeId": inviteeId,
          "inviteeName": inviteeName,
        }),
      );
      final result = jsonDecode(utf8.decode(response.bodyBytes));
      if (response.statusCode == 200 && result['status'] == 'success') {
        return (true, '${result['message'] ?? '초대를 보냈습니다.'}');
      }
      return (false, '${result['message'] ?? '초대 실패'}');
    } catch (e) {
      return (false, '네트워크 에러: $e');
    } finally {
      _isBusy = false;
      _safeNotify();
    }
  }

  Future<(bool success, String message)> leave() async {
    _isBusy = true;
    _safeNotify();
    try {
      final response = await http.post(
        Uri.parse('$baseUrl/api/groups/$groupId/leave'),
        headers: {"Content-Type": "application/json"},
        body: jsonEncode({"studentId": studentId}),
      );
      final result = jsonDecode(utf8.decode(response.bodyBytes));
      if (response.statusCode == 200 && result['status'] == 'success') {
        return (true, '${result['message'] ?? '그룹에서 나갔습니다.'}');
      }
      return (false, '${result['message'] ?? '처리 실패'}');
    } catch (e) {
      return (false, '네트워크 에러: $e');
    } finally {
      _isBusy = false;
      _safeNotify();
    }
  }
}