// 🛠️ 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 'login_screen.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;
    ScaffoldMessenger.of(
      context,
    ).showSnackBar(SnackBar(content: Text(message)));
  }

  void _showResetConfirmDialog() {
    showDialog(
      context: context,
      builder: (BuildContext dialogContext) {
        return AlertDialog(
          title: const Text(
            'DB 초기화 경고',
            style: TextStyle(color: Colors.red, 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(
              style: ElevatedButton.styleFrom(backgroundColor: Colors.red),
              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(
            title: const Text('관리자 시스템'),
            backgroundColor: AppPalette.ink,
            foregroundColor: AppPalette.paper,
            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: 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: Colors.red)
                      : SizedBox(
                          width: double.infinity,
                          height: 60,
                          child: ElevatedButton.icon(
                            style: ElevatedButton.styleFrom(
                              backgroundColor: Colors.red[50],
                              foregroundColor: Colors.red,
                              side: const BorderSide(
                                color: Colors.red,
                                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,
                          ),
                        ),
                ],
              ),
            ),
          ),
        );
      },
    );
  }
}