school-attendance/lib/ui/admin_dashboard.dart

// 🛠️ 시스템 관리자 대시보드 (UI 전용). 출석 DB 전체 초기화 버튼을 그린다.
// 서버 통신/상태는 lib/function/admin_controller.dart가 담당한다.
import 'package:flutter/material.dart';
import '../function/admin_controller.dart';
import '../theme/app_palette.dart';
import 'app_notice.dart';
import 'login_screen.dart';
import 'title_pill.dart';

// ==========================================
// 🛠️ 5. 관리자 대시보드 (DB 초기화 암호 파라미터 보정 완료)
// ==========================================
class AdminDashboard extends StatefulWidget {
  const AdminDashboard({super.key});

  @override
  State<AdminDashboard> createState() => _AdminDashboardState();
}

class _AdminDashboardState extends State<AdminDashboard> {
  final AdminController _controller = AdminController();

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  Future<void> _resetDatabase() async {
    final message = await _controller.resetDatabase();
    if (!mounted) return;
    AppNotice.show(context, message);
  }

  void _showResetConfirmDialog() {
    showDialog(
      context: context,
      builder: (BuildContext dialogContext) {
        return AlertDialog(
          title: const Text(
            'DB 초기화 경고',
            style: TextStyle(
              color: AppPalette.danger,
              fontWeight: FontWeight.bold,
            ),
          ),
          content: const Text(
            '모든 학생의 출석 및 휴대폰 제출 데이터가 영구적으로 삭제됩니다.\n\n정말 초기화하시겠습니까?',
          ),
          actions: [
            TextButton(
              onPressed: () => Navigator.pop(dialogContext),
              child: const Text('취소', style: TextStyle(color: Colors.grey)),
            ),
            ElevatedButton(
              autofocus: true,
              style: ElevatedButton.styleFrom(
                backgroundColor: AppPalette.danger,
              ),
              onPressed: () {
                Navigator.pop(dialogContext);
                _resetDatabase();
              },
              child: const Text(
                '초기화 실행',
                style: TextStyle(color: Colors.white),
              ),
            ),
          ],
        );
      },
    );
  }

  @override
  Widget build(BuildContext context) {
    return ListenableBuilder(
      listenable: _controller,
      builder: (context, _) {
        return Scaffold(
          backgroundColor: AppPalette.mist,
          appBar: AppBar(
            backgroundColor: Colors.transparent,
            foregroundColor: AppPalette.ink,
            elevation: 0,
            centerTitle: true,
            title: const TitlePill('관리자 시스템'),
            actions: [
              IconButton(
                icon: const Icon(Icons.logout),
                onPressed: () => Navigator.pushReplacement(
                  context,
                  MaterialPageRoute(builder: (context) => const LoginScreen()),
                ),
              ),
            ],
          ),
          body: Center(
            child: Padding(
              padding: const EdgeInsets.all(24.0),
              child: ConstrainedBox(
                constraints: const BoxConstraints(maxWidth: 420),
                child: Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: [
                    const Icon(
                      Icons.admin_panel_settings,
                      size: 100,
                      color: AppPalette.ink,
                    ),
                    const SizedBox(height: 20),
                    const Text(
                      '데이터베이스 관리',
                      style: TextStyle(
                        fontSize: 22,
                        fontWeight: FontWeight.bold,
                      ),
                    ),
                    const SizedBox(height: 40),

                    _controller.isLoading
                        ? const CircularProgressIndicator(
                            color: AppPalette.danger,
                          )
                        : SizedBox(
                            width: double.infinity,
                            height: 60,
                            child: ElevatedButton.icon(
                              style: ElevatedButton.styleFrom(
                                backgroundColor: AppPalette.dangerBg,
                                foregroundColor: AppPalette.danger,
                                side: const BorderSide(
                                  color: AppPalette.danger,
                                  width: 2,
                                ),
                                shape: RoundedRectangleBorder(
                                  borderRadius: BorderRadius.circular(12),
                                ),
                              ),
                              icon: const Icon(Icons.delete_forever, size: 28),
                              label: const Text(
                                '모든 출석 데이터 초기화',
                                style: TextStyle(
                                  fontSize: 18,
                                  fontWeight: FontWeight.bold,
                                ),
                              ),
                              onPressed: _showResetConfirmDialog,
                            ),
                          ),
                  ],
                ),
              ),
            ),
          ),
        );
      },
    );
  }
}