school-attendance/lib/function/teacher_student_management_controller.dart

// 👥 교사용 학생 계정 관리 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 TeacherStudentManagementController extends ChangeNotifier {
  bool _isWorking = false;
  bool get isWorking => _isWorking;

  /// ➕ 학생 계정 추가. (성공여부, 메시지)를 반환한다 — UI가 성공했을 때만 입력칸을 비운다.
  Future<(bool success, String message)> addStudentAccount({
    required String studentId,
    required String name,
    required String password,
    int? grade,
  }) async {
    _isWorking = true;
    notifyListeners();
    try {
      final url = Uri.parse('$baseUrl/api/users/create');
      final response = await http.post(
        url,
        headers: {"Content-Type": "application/json"},
        body: jsonEncode({
          "studentId": studentId,
          "name": name,
          "password": password,
          "grade": grade,
        }),
      );
      final result = jsonDecode(utf8.decode(response.bodyBytes));

      if (response.statusCode == 200 || response.statusCode == 201) {
        return (true, '✅ 계정 생성 완료: ${result['message'] ?? '성공'}');
      } else {
        return (false, '❌ 생성 실패: ${result['message'] ?? '오류 발생'}');
      }
    } catch (e) {
      return (false, '🚨 네트워크 에러: $e');
    } finally {
      _isWorking = false;
      notifyListeners();
    }
  }

  /// ❌ 학생 계정 삭제.
  Future<(bool success, String message)> deleteStudentAccount(
    String studentId,
  ) async {
    _isWorking = true;
    notifyListeners();
    final url = Uri.parse('$baseUrl/api/users/delete');
    try {
      final response = await http.delete(
        url,
        headers: {"Content-Type": "application/json"},
        body: jsonEncode({"studentId": studentId}),
      );
      if (response.statusCode == 200) {
        final resData = jsonDecode(utf8.decode(response.bodyBytes));
        return (true, '✅ ${resData['message']}');
      } else {
        return (false, '❌ 삭제 실패하였습니다.');
      }
    } catch (e) {
      return (false, '❌ 서버 에러 발생');
    } finally {
      _isWorking = false;
      notifyListeners();
    }
  }
}