// 🎓 학생 대시보드. NFC 주머니 체크인 진입, 실시간 학교 상황 안내,
// 개발자 마스터 계정 전용 관리 메뉴(현황/DB제어/계정관리/삭제)를 담당한다.
import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import '../config.dart';
import '../nfc_poccket_checkin_screen.dart';
import 'login_screen.dart';
import 'teacher_attendance_page.dart';
import 'admin_dashboard.dart';
import 'student_management_screen.dart';
import 'nfc_tag_writer_screen.dart';

// -------------------------------------------------------------
// 2. 학생 대시보드 (StudentDashboard)
// -------------------------------------------------------------

class StudentDashboard extends StatefulWidget {
  final String studentId;
  final String studentName;
  final bool isDeviceMatched; // 🆕 [변경] 기기 UUID가 매칭되었는지 확인하는 변수 추가

  const StudentDashboard({
    super.key,
    required this.studentId,
    required this.studentName,
    required this.isDeviceMatched, // 🆕 [변경] 필수 매개변수로 등록
  });

  @override
  State<StudentDashboard> createState() => _StudentDashboardState();
}

class _StudentDashboardState extends State<StudentDashboard> {
  bool _isLoading = false;

  // 1️⃣ NFC 태그 카드 → 실제 NFC 주머니 체크인 화면으로 이동
  void _openPocketCheckIn(BuildContext context) {
    Navigator.push(
      context,
      MaterialPageRoute(
        builder: (context) => NfcPocketCheckInScreen(
          studentId: widget.studentId,
          studentName: widget.studentName,
        ),
      ),
    );
  }

  // 2️⃣ [기존 동일] 마스터 계정 전용 회원 삭제 API 호출 함수
  Future<void> _deleteUser(BuildContext context, String userId) async {
    setState(() => _isLoading = true);
    final url = Uri.parse('$baseUrl/api/users/delete/$userId');

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

      if (response.statusCode == 200) {
        final responseData = jsonDecode(response.body);
        ScaffoldMessenger.of(
          context,
        ).showSnackBar(SnackBar(content: Text('✅ ${responseData['message']}')));
      } else {
        final errorData = jsonDecode(response.body);
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Text('❌ 삭제 실패: ${errorData['detail'] ?? '알 수 없는 오류'}'),
          ),
        );
      }
    } catch (e) {
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('❌ 서버와 연결할 수 없습니다. (네트워크 에러)')),
      );
    } finally {
      setState(() => _isLoading = false);
    }
  }

  // 3️⃣ [기존 동일] 학번/교직원 번호를 입력받는 모던 팝업창(Dialog)
  void _showDeleteUserDialog(BuildContext context) {
    final TextEditingController idController = TextEditingController();

    showDialog(
      context: context,
      builder: (context) {
        return AlertDialog(
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(24),
          ),
          title: const Row(
            children: [
              Icon(Icons.warning_amber_rounded, color: Colors.redAccent),
              SizedBox(width: 10),
              Text(
                '계정 강제 삭제',
                style: TextStyle(fontWeight: FontWeight.bold, fontSize: 18),
              ),
            ],
          ),
          content: Column(
            mainAxisSize: MainAxisSize.min,
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              const Text(
                '학생의 학번 또는 교사의 교직원 번호를 입력하세요.\nDB에서 해당 계정과 토큰이 즉시 삭제됩니다.',
                style: TextStyle(
                  color: Colors.black54,
                  fontSize: 13,
                  height: 1.4,
                ),
              ),
              const SizedBox(height: 16),
              TextField(
                controller: idController,
                decoration: InputDecoration(
                  labelText: '학번 또는 교직원 번호',
                  hintText: '예: 201101 또는 T1001',
                  labelStyle: TextStyle(color: Colors.red[400]),
                  focusedBorder: OutlineInputBorder(
                    borderRadius: BorderRadius.circular(16),
                    borderSide: BorderSide(color: Colors.red[400]!, width: 2),
                  ),
                  border: OutlineInputBorder(
                    borderRadius: BorderRadius.circular(16),
                  ),
                  prefixIcon: const Icon(Icons.person_remove_alt_1_rounded),
                ),
              ),
            ],
          ),
          actions: [
            TextButton(
              onPressed: () => Navigator.pop(context),
              child: const Text(
                '취소',
                style: TextStyle(
                  color: Colors.grey,
                  fontWeight: FontWeight.bold,
                ),
              ),
            ),
            ElevatedButton(
              onPressed: () {
                final inputId = idController.text.trim();
                if (inputId.isNotEmpty) {
                  Navigator.pop(context);
                  _deleteUser(context, inputId);
                }
              },
              style: ElevatedButton.styleFrom(
                backgroundColor: Colors.redAccent,
                foregroundColor: Colors.white,
                shape: RoundedRectangleBorder(
                  borderRadius: BorderRadius.circular(12),
                ),
                elevation: 0,
              ),
              child: const Text(
                '삭제 실행',
                style: TextStyle(fontWeight: FontWeight.bold),
              ),
            ),
          ],
        );
      },
    );
  }

  @override
  Widget build(BuildContext context) {
    final bool isDeveloper = widget.studentId == "2061";

    return Scaffold(
      backgroundColor: Colors.grey[100],
      appBar: AppBar(
        title: Text(
          isDeveloper ? '👑 MASTER CONTROL' : '🎓 STUDENT PORTAL',
          style: const TextStyle(
            fontWeight: FontWeight.bold,
            letterSpacing: 1.2,
          ),
        ),
        centerTitle: true,
        backgroundColor: isDeveloper
            ? Colors.deepPurple[700]
            : Colors.indigo[700],
        foregroundColor: Colors.white,
        elevation: 0,
        actions: [
          IconButton(
            icon: const Icon(Icons.logout_rounded),
            onPressed: () => Navigator.pushReplacement(
              context,
              MaterialPageRoute(builder: (context) => const LoginScreen()),
            ),
          ),
        ],
      ),
      body: SingleChildScrollView(
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Container(
              width: double.infinity,
              padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 28),
              decoration: BoxDecoration(
                color: isDeveloper
                    ? Colors.deepPurple[700]
                    : Colors.indigo[700],
                borderRadius: const BorderRadius.only(
                  bottomLeft: Radius.circular(32),
                  bottomRight: Radius.circular(32),
                ),
              ),
              child: Row(
                children: [
                  Container(
                    padding: const EdgeInsets.all(4),
                    decoration: const BoxDecoration(
                      color: Colors.white,
                      shape: BoxShape.circle,
                    ),
                    child: CircleAvatar(
                      radius: 30,
                      backgroundColor: isDeveloper
                          ? Colors.deepPurple[50]
                          : Colors.indigo[50],
                      child: Icon(
                        isDeveloper
                            ? Icons.admin_panel_settings_rounded
                            : Icons.school_rounded,
                        size: 32,
                        color: isDeveloper ? Colors.deepPurple : Colors.indigo,
                      ),
                    ),
                  ),
                  const SizedBox(width: 18),
                  Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Text(
                        '${widget.studentName} 님',
                        style: const TextStyle(
                          fontSize: 22,
                          fontWeight: FontWeight.bold,
                          color: Colors.white,
                        ),
                      ),
                      const SizedBox(height: 4),
                      Text(
                        isDeveloper
                            ? '최고 관리 권한 활성화됨'
                            : '학번: ${widget.studentId} | 인증 완료',
                        style: TextStyle(
                          color: Colors.white.withValues(alpha: 0.8),
                          fontSize: 14,
                        ),
                      ),
                    ],
                  ),
                ],
              ),
            ),
            const SizedBox(height: 32),
            Padding(
              padding: const EdgeInsets.symmetric(horizontal: 24.0),
              child: Row(
                children: [
                  Container(
                    width: 4,
                    height: 18,
                    decoration: BoxDecoration(
                      color: isDeveloper ? Colors.deepPurple : Colors.indigo,
                      borderRadius: BorderRadius.circular(2),
                    ),
                  ),
                  const SizedBox(width: 10),
                  const Text(
                    '스마트 관리 시스템 메뉴',
                    style: TextStyle(
                      fontSize: 18,
                      fontWeight: FontWeight.bold,
                      color: Colors.black87,
                    ),
                  ),
                ],
              ),
            ),
            const SizedBox(height: 16),
            Padding(
              padding: const EdgeInsets.symmetric(horizontal: 24.0),
              child: GridView.count(
                shrinkWrap: true,
                physics: const NeverScrollableScrollPhysics(),
                crossAxisCount: 2,
                crossAxisSpacing: 16,
                mainAxisSpacing: 16,
                childAspectRatio: 0.95,
                children: [
                  // 🆕 [변경 지점] 기기가 일치하면 정상 활성화, 일치하지 않으면 자물쇠Lock 처리
                  if (isDeveloper || widget.studentId != "2061")
                    _buildModernCard(
                      icon: widget.isDeviceMatched
                          ? Icons.contactless_rounded
                          : Icons.lock_rounded,
                      title: 'NFC 태그',
                      subtitle: widget.isDeviceMatched
                          ? '출석 및 폰 수거 완료'
                          : '⚠️ 본인 인증 기기 전용',
                      color: widget.isDeviceMatched
                          ? Colors.blue
                          : Colors.grey[400]!,
                      onTap: widget.isDeviceMatched
                          ? () => _openPocketCheckIn(context)
                          : () {
                              ScaffoldMessenger.of(context).showSnackBar(
                                const SnackBar(
                                  content: Text(
                                    '🚨 대리 출석 방지를 위해 등록된 본인 스마트폰에서만 출석 가능합니다.',
                                  ),
                                ),
                              );
                            },
                      isActionButton: widget.isDeviceMatched,
                      isLoading: _isLoading,
                    ),

                  // 🆕 [추가 지점] 기기 일치 여부 상관없이 태블릿에서도 누구나 확인 가능한 학교 상황판 카드
                  _buildModernCard(
                    icon: Icons.fastfood_rounded,
                    title: '실시간 학교 상황',
                    subtitle: '급식실 줄 & 매점 재고 확인',
                    color: Colors.orange[700]!,
                    onTap: () {
                      ScaffoldMessenger.of(context).showSnackBar(
                        const SnackBar(
                          content: Text('🍔 실시간 학교 상황 페이지로 이동합니다.'),
                        ),
                      );
                    },
                  ),

                  if (isDeveloper)
                    _buildModernCard(
                      icon: Icons.monitor_heart_rounded,
                      title: '실시간 현황',
                      subtitle: '교사용 수거 모니터링',
                      color: Colors.teal,
                      onTap: () => Navigator.push(
                        context,
                        MaterialPageRoute(
                          builder: (context) => const TeacherAttendancePage(),
                        ),
                      ),
                    ),
                  if (isDeveloper)
                    _buildModernCard(
                      icon: Icons.terminal_rounded,
                      title: '서버 DB 제어',
                      subtitle: '시스템 원격 초기화',
                      color: Colors.amber[800]!,
                      onTap: () => Navigator.push(
                        context,
                        MaterialPageRoute(
                          builder: (context) => const AdminDashboard(),
                        ),
                      ),
                    ),
                  if (isDeveloper)
                    _buildModernCard(
                      icon: Icons.add_moderator_rounded,
                      title: '학생 계정 관리',
                      subtitle: 'UUID 리셋 및 승인',
                      color: Colors.purple,
                      onTap: () => Navigator.push(
                        context,
                        MaterialPageRoute(
                          builder: (context) => const StudentManagementScreen(),
                        ),
                      ),
                    ),
                  if (isDeveloper)
                    _buildModernCard(
                      icon: Icons.delete_sweep_rounded,
                      title: '계정 강제 삭제',
                      subtitle: '학생 및 교사 DB 삭제',
                      color: Colors.red[600]!,
                      onTap: () => _showDeleteUserDialog(context),
                    ),
                  if (isDeveloper)
                    _buildModernCard(
                      icon: Icons.edit_note_rounded,
                      title: 'NFC 태그 쓰기',
                      subtitle: '주머니 스티커 초기 설정',
                      color: Colors.deepPurple,
                      onTap: () => Navigator.push(
                        context,
                        MaterialPageRoute(
                          builder: (context) => const NfcTagWriterScreen(),
                        ),
                      ),
                    ),
                ],
              ),
            ),
            const SizedBox(height: 32),
          ],
        ),
      ),
    );
  }

  // 5️⃣ [카드 디자인 위젯] - 기존 형태 완전 보존
  Widget _buildModernCard({
    required IconData icon,
    required String title,
    required String subtitle,
    required Color color,
    required VoidCallback onTap,
    bool isActionButton = false,
    bool isLoading = false,
  }) {
    return InkWell(
      onTap: isLoading ? null : onTap,
      borderRadius: BorderRadius.circular(24),
      child: Ink(
        padding: const EdgeInsets.all(20),
        decoration: BoxDecoration(
          color: Colors.white,
          borderRadius: BorderRadius.circular(24),
          boxShadow: [
            BoxShadow(
              color: Colors.black.withValues(alpha: 0.04),
              blurRadius: 16,
              offset: const Offset(0, 4),
            ),
          ],
        ),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          mainAxisAlignment: MainAxisAlignment.spaceBetween,
          children: [
            Container(
              padding: const EdgeInsets.all(12),
              decoration: BoxDecoration(
                color: color.withValues(alpha: 0.1),
                borderRadius: BorderRadius.circular(16),
              ),
              child: Icon(icon, color: color, size: 28),
            ),
            Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: [
                    Text(
                      title,
                      style: const TextStyle(
                        fontSize: 16,
                        fontWeight: FontWeight.bold,
                        color: Colors.black87,
                      ),
                    ),
                    if (isLoading)
                      const SizedBox(
                        width: 16,
                        height: 16,
                        child: CircularProgressIndicator(strokeWidth: 2),
                      )
                    else if (isActionButton)
                      Icon(
                        Icons.touch_app_rounded,
                        size: 16,
                        color: color.withValues(alpha: 0.5),
                      ),
                  ],
                ),
                const SizedBox(height: 4),
                Text(
                  subtitle,
                  style: TextStyle(
                    fontSize: 12,
                    color: Colors.grey[500],
                    height: 1.2,
                  ),
                ),
              ],
            ),
          ],
        ),
      ),
    );
  }
}