import 'package:flutter/material.dart';
import 'package:provider/provider.dart';

import '../../services/admin_service.dart';
import '../../services/subscription_service.dart';
import '../../models/subscription_model.dart';
import '../../widgets/dialog_actions.dart';

/// 관리자 대시보드 화면
class AdminDashboardScreen extends StatefulWidget {
  const AdminDashboardScreen({super.key});

  @override
  State<AdminDashboardScreen> createState() => _AdminDashboardScreenState();
}

class _AdminDashboardScreenState extends State<AdminDashboardScreen> {
  Map<String, dynamic>? _analyticsData;
  bool _isLoading = false;

  @override
  void initState() {
    super.initState();
    _loadData();
  }

  /// 데이터 로드
  Future<void> _loadData() async {
    setState(() {
      _isLoading = true;
    });

    try {
      final adminService = Provider.of<AdminService>(context, listen: false);
      final analyticsData = await adminService.fetchClubAnalytics();
      if (!mounted) return;
      setState(() {
        _analyticsData = analyticsData;
      });
    } catch (e) {
      final messenger = ScaffoldMessenger.of(context);
      messenger.showSnackBar(
        SnackBar(content: Text('데이터 로드 중 오류가 발생했습니다: $e')),
      );
    } finally {
      if (mounted) {
        setState(() {
          _isLoading = false;
        });
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    final adminService = Provider.of<AdminService>(context);
    final subscriptionService = Provider.of<SubscriptionService>(context);
    
    return Scaffold(
      appBar: AppBar(
        title: const Text('관리자 대시보드'),
        actions: [
          IconButton(
            icon: const Icon(Icons.refresh),
            onPressed: _loadData,
          ),
        ],
      ),
      body: _isLoading
          ? const Center(child: CircularProgressIndicator())
          : RefreshIndicator(
              onRefresh: _loadData,
              child: SingleChildScrollView(
                padding: const EdgeInsets.all(16.0),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    _buildPermissionsCard(adminService),
                    const SizedBox(height: 16),
                    _buildSubscriptionCard(subscriptionService),
                    const SizedBox(height: 16),
                    _buildAnalyticsCard(),
                    const SizedBox(height: 16),
                    _buildQuickActionsCard(context, adminService),
                  ],
                ),
              ),
            ),
    );
  }

  /// 권한 정보 카드
  Widget _buildPermissionsCard(AdminService adminService) {
    return Card(
      elevation: 2,
      child: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Row(
              children: [
                const Icon(Icons.admin_panel_settings),
                const SizedBox(width: 8),
                Text(
                  '관리자 권한',
                  style: Theme.of(context).textTheme.titleLarge,
                ),
              ],
            ),
            const Divider(),
            const SizedBox(height: 8),
            _buildPermissionItem(
              '회원 관리', 
              adminService.canManageMembers,
              Icons.people,
            ),
            _buildPermissionItem(
              '이벤트 관리', 
              adminService.canManageEvents,
              Icons.event,
            ),
            _buildPermissionItem(
              '점수 관리', 
              adminService.canManageScores,
              Icons.score,
            ),
            _buildPermissionItem(
              '설정 관리', 
              adminService.canManageSettings,
              Icons.settings,
            ),
            _buildPermissionItem(
              '구독 관리', 
              adminService.canManageSubscription,
              Icons.subscriptions,
            ),
            _buildPermissionItem(
              '역할 관리', 
              adminService.canManageRoles,
              Icons.admin_panel_settings,
            ),
            _buildPermissionItem(
              '재무 정보 조회', 
              adminService.canViewFinancials,
              Icons.attach_money,
            ),
            _buildPermissionItem(
              '데이터 내보내기', 
              adminService.canExportData,
              Icons.file_download,
            ),
          ],
        ),
      ),
    );
  }

  /// 권한 항목 위젯
  Widget _buildPermissionItem(String title, bool hasPermission, IconData icon) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 4.0),
      child: Row(
        children: [
          Icon(
            icon,
            size: 18,
            color: hasPermission ? Colors.green : Colors.grey,
          ),
          const SizedBox(width: 8),
          Text(title),
          const Spacer(),
          Icon(
            hasPermission ? Icons.check_circle : Icons.cancel,
            color: hasPermission ? Colors.green : Colors.red,
            size: 18,
          ),
        ],
      ),
    );
  }

  /// 구독 정보 카드
  Widget _buildSubscriptionCard(SubscriptionService subscriptionService) {
    final subscription = subscriptionService.currentSubscription;
    
    return Card(
      elevation: 2,
      child: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Row(
              children: [
                const Icon(Icons.subscriptions),
                const SizedBox(width: 8),
                Text(
                  '구독 정보',
                  style: Theme.of(context).textTheme.titleLarge,
                ),
              ],
            ),
            const Divider(),
            const SizedBox(height: 8),
            if (subscription != null) ...[
              _buildInfoRow('플랜', subscription.planName),
              _buildInfoRow('상태', _getStatusText(subscription.status)),
              _buildInfoRow('시작일', _formatDate(subscription.startDate)),
              _buildInfoRow('만료일', _formatDate(subscription.endDate)),
              _buildInfoRow('자동 갱신', subscription.autoRenew ? '활성화' : '비활성화'),
              _buildInfoRow('남은 일수', '${subscription.daysLeft}일'),
            ] else
              const Text('활성화된 구독이 없습니다.'),
            const SizedBox(height: 16),
            ElevatedButton(
              onPressed: () {
                Navigator.of(context).pushNamed('/subscription/manage');
              },
              child: const Text('구독 관리'),
            ),
          ],
        ),
      ),
    );
  }

  /// 분석 데이터 카드
  Widget _buildAnalyticsCard() {
    return Card(
      elevation: 2,
      child: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Row(
              children: [
                const Icon(Icons.analytics),
                const SizedBox(width: 8),
                Text(
                  '클럽 통계',
                  style: Theme.of(context).textTheme.titleLarge,
                ),
              ],
            ),
            const Divider(),
            const SizedBox(height: 8),
            if (_analyticsData != null) ...[
              _buildInfoRow('총 회원 수', '${_analyticsData!['totalMembers'] ?? 0}명'),
              _buildInfoRow('활성 회원 수', '${_analyticsData!['activeMembers'] ?? 0}명'),
              _buildInfoRow('이번 달 신규 회원', '${_analyticsData!['newMembersThisMonth'] ?? 0}명'),
              _buildInfoRow('총 이벤트 수', '${_analyticsData!['totalEvents'] ?? 0}개'),
              _buildInfoRow('이번 달 이벤트', '${_analyticsData!['eventsThisMonth'] ?? 0}개'),
              _buildInfoRow('총 게임 수', '${_analyticsData!['totalGames'] ?? 0}게임'),
              _buildInfoRow('평균 점수', '${_analyticsData!['averageScore'] ?? 0}점'),
            ] else
              const Text('통계 데이터를 불러올 수 없습니다.'),
          ],
        ),
      ),
    );
  }

  /// 빠른 작업 카드
  Widget _buildQuickActionsCard(BuildContext context, AdminService adminService) {
    return Card(
      elevation: 2,
      child: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Row(
              children: [
                const Icon(Icons.flash_on),
                const SizedBox(width: 8),
                Text(
                  '빠른 작업',
                  style: Theme.of(context).textTheme.titleLarge,
                ),
              ],
            ),
            const Divider(),
            const SizedBox(height: 8),
            Wrap(
              spacing: 8.0,
              runSpacing: 8.0,
              children: [
                if (adminService.canManageMembers)
                  _buildActionButton(
                    context,
                    '회원 관리',
                    Icons.people,
                    () => Navigator.of(context).pushNamed('/admin/members'),
                  ),
                if (adminService.canManageEvents)
                  _buildActionButton(
                    context,
                    '이벤트 관리',
                    Icons.event,
                    () => Navigator.of(context).pushNamed('/admin/events'),
                  ),
                if (adminService.canManageSettings)
                  _buildActionButton(
                    context,
                    '클럽 설정',
                    Icons.settings,
                    () => Navigator.of(context).pushNamed('/admin/settings'),
                  ),
                if (adminService.canManageRoles)
                  _buildActionButton(
                    context,
                    '역할 관리',
                    Icons.admin_panel_settings,
                    () => Navigator.of(context).pushNamed('/admin/roles'),
                  ),
                if (adminService.canExportData)
                  _buildActionButton(
                    context,
                    '데이터 내보내기',
                    Icons.file_download,
                    () => _showExportDialog(context),
                  ),
              ],
            ),
          ],
        ),
      ),
    );
  }

  /// 작업 버튼 위젯
  Widget _buildActionButton(
    BuildContext context,
    String label,
    IconData icon,
    VoidCallback onPressed,
  ) {
    return ElevatedButton.icon(
      onPressed: onPressed,
      icon: Icon(icon, size: 18),
      label: Text(label),
      style: ElevatedButton.styleFrom(
        padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
      ),
    );
  }

  /// 데이터 내보내기 다이얼로그
  void _showExportDialog(BuildContext context) {
    showDialog(
      context: context,
      builder: (context) => AlertDialog(
        title: const Text('데이터 내보내기'),
        content: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            ListTile(
              leading: const Icon(Icons.people),
              title: const Text('회원 데이터'),
              onTap: () => _exportData(context, 'members'),
            ),
            ListTile(
              leading: const Icon(Icons.event),
              title: const Text('이벤트 데이터'),
              onTap: () => _exportData(context, 'events'),
            ),
            ListTile(
              leading: const Icon(Icons.score),
              title: const Text('점수 데이터'),
              onTap: () => _exportData(context, 'scores'),
            ),
            ListTile(
              leading: const Icon(Icons.analytics),
              title: const Text('통계 데이터'),
              onTap: () => _exportData(context, 'analytics'),
            ),
          ],
        ),
        actions: DialogActions.confirm(
          onCancel: () => Navigator.of(context).pop(),
          onConfirm: () => Navigator.of(context).pop(),
          confirmText: '닫기',
        ),
      ),
    );
  }

  /// 데이터 내보내기 처리
  Future<void> _exportData(BuildContext context, String dataType) async {
    final navigator = Navigator.of(context);
    final messenger = ScaffoldMessenger.of(context);
    navigator.pop(); // 다이얼로그 닫기
    
    setState(() {
      _isLoading = true;
    });
    
    try {
      final adminService = Provider.of<AdminService>(context, listen: false);
      final downloadUrl = await adminService.exportClubData(dataType);
      
      if (downloadUrl != null) {
        messenger.showSnackBar(
          SnackBar(content: Text('데이터 내보내기 성공: $downloadUrl')),
        );
      } else {
        messenger.showSnackBar(
          const SnackBar(content: Text('데이터 내보내기에 실패했습니다.')),
        );
      }
    } catch (e) {
      messenger.showSnackBar(
        SnackBar(content: Text('데이터 내보내기 중 오류가 발생했습니다: $e')),
      );
    } finally {
      if (mounted) {
        setState(() {
          _isLoading = false;
        });
      }
    }
  }

  /// 정보 행 위젯
  Widget _buildInfoRow(String label, String value) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 4.0),
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        children: [
          Text(
            '$label:',
            style: const TextStyle(fontWeight: FontWeight.bold),
          ),
          Text(value),
        ],
      ),
    );
  }

  /// 날짜 포맷팅
  String _formatDate(DateTime date) {
    return '${date.year}-${date.month.toString().padLeft(2, '0')}-${date.day.toString().padLeft(2, '0')}';
  }

  /// 구독 상태 텍스트
  String _getStatusText(SubscriptionStatus status) {
    switch (status) {
      case SubscriptionStatus.active:
        return '활성화';
      case SubscriptionStatus.canceled:
        return '취소됨';
      case SubscriptionStatus.expired:
        return '만료됨';
      case SubscriptionStatus.pending:
        return '대기 중';
      case SubscriptionStatus.failed:
        return '실패';
    }
  }
}