// 🛠️ 시스템 관리자 대시보드. 출석 DB 전체 초기화 기능만 담당한다.
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import '../config.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> {
  bool _isLoading = false;

  Future<void> resetDatabase() async {
    setState(() => _isLoading = true);

    // 🆕 백엔드 보안 규칙에 맞추어 초기화 토큰 비밀번호 파라미터(?password=...)를 연동 주소에 매칭했습니다.
    final url = Uri.parse('$baseUrl/reset-db?password=adminreset2010');

    try {
      final response = await http.get(url);

      if (response.statusCode == 200) {
        if (!mounted) return;
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(
            content: Text('💥 DB가 깔끔하게 초기화되었습니다! (출석 번호 1번부터 시작)'),
          ),
        );
      } else {
        if (!mounted) return;
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Text('❌ 초기화 실패: 서버 권한 오류 (${response.statusCode})'),
          ),
        );
      }
    } catch (e) {
      if (!mounted) return;
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('❌ 네트워크 에러: 서버와 연결할 수 없습니다.')),
      );
    } finally {
      if (mounted) setState(() => _isLoading = false);
    }
  }

  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 Scaffold(
      appBar: AppBar(
        title: const Text('🛠️ 관리자 시스템'),
        backgroundColor: Colors.orange,
        foregroundColor: Colors.white,
        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: Colors.orange,
              ),
              const SizedBox(height: 20),
              const Text(
                '데이터베이스 관리',
                style: TextStyle(fontSize: 22, fontWeight: FontWeight.bold),
              ),
              const SizedBox(height: 40),

              _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,
                      ),
                    ),
            ],
          ),
        ),
      ),
    );
  }
}