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

import '../../models/member_model.dart';
import '../../services/auth_service.dart';
import '../../services/club_service.dart';
import '../../services/member_service.dart';
import '../../utils/enum_mappings.dart';
import '../../widgets/owner_dropdown.dart';

class ClubSettingsScreen extends StatefulWidget {
  static const routeName = '/club-settings';

  const ClubSettingsScreen({super.key, this.onOwnerItemsBuilt, this.initialMembers});

  // 테스트 전용: 모임장 드롭다운 항목 개수 리포트 콜백
  final ValueChanged<int>? onOwnerItemsBuilt;
  // 테스트 전용: 초기 멤버 목록을 직접 주입하여 로딩을 우회
  final List<Member>? initialMembers;

  @override
  State<ClubSettingsScreen> createState() => _ClubSettingsScreenState();
}

class _ClubSettingsScreenState extends State<ClubSettingsScreen> {
  final _formKey = GlobalKey<FormState>();
  final _nameController = TextEditingController();
  final _descriptionController = TextEditingController();
  final _locationController = TextEditingController();
  final _femaleHandicapController = TextEditingController();

  String? _selectedAverageCalculationPeriod;
  String? _selectedOwnerId;
  List<Member> _members = [];
  bool _isLoading = true;
  bool _hasEditPermission = false;

  @override
  void initState() {
    super.initState();
    if (widget.initialMembers != null) {
      // 테스트 경로: 초기 데이터 주입
      _members = List<Member>.from(widget.initialMembers!);
      _isLoading = false;
      _hasEditPermission = true; // 테스트에서는 편집 가능 상태로 둠
    } else {
      // 첫 프레임 이후에 로드하여 InheritedWidget 접근 안전 보장
      WidgetsBinding.instance.addPostFrameCallback((_) => _loadData());
    }
  }

  @override
  void dispose() {
    _nameController.dispose();
    _descriptionController.dispose();
    _locationController.dispose();
    _femaleHandicapController.dispose();
    super.dispose();
  }

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

    // await 이전에 authService 캡처 (이후 권한 계산에 사용)
    final authService = Provider.of<AuthService>(context, listen: false);

    try {
      // 클럽 정보 로드
      final clubService = Provider.of<ClubService>(context, listen: false);
      final club = clubService.currentClub;

      if (club != null) {
        _nameController.text = club.name;
        _descriptionController.text = club.description ?? '';
        _locationController.text = club.location ?? '';
        _femaleHandicapController.text = club.femaleHandicap?.toString() ?? '';
        _selectedAverageCalculationPeriod =
            club.averageCalculationPeriod ?? 'total';
        _selectedOwnerId = club.ownerId;
      }

      // 회원 목록 로드
      final memberService = Provider.of<MemberService>(context, listen: false);
      await memberService.fetchClubMembers();
      setState(() {
        _members = memberService.members;
      });

      // 권한 확인
      final currentUserId = authService.currentUser?.id;

      // 현재 사용자가 클럽 소유자이거나 관리자인지 확인
      if (currentUserId != null) {
        final currentMember = _members.firstWhere(
          (member) => member.userId == currentUserId,
          orElse: () => Member(
            id: '',
            userId: '',
            name: '',
            memberType: '',
            clubId: club?.id ?? '',
            email: '',
            isActive: true,
          ),
        );

        setState(() {
          _hasEditPermission =
              club?.ownerId == currentUserId || // 클럽 소유자
              currentMember.memberType == 'manager' || // 클럽 매니저
              authService.currentUser?.role == 'admin'; // 시스템 관리자
        });
      }
    } catch (error) {
      if (!mounted) return;
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text('데이터 로드 중 오류가 발생했습니다: $error')),
      );
    } finally {
      if (mounted) {
        setState(() {
          _isLoading = false;
        });
      }
    }
  }

  Future<void> _saveClubInfo() async {
    if (!_formKey.currentState!.validate()) {
      return;
    }

    setState(() {
      _isLoading = true;
    });

    // await 이전에 messenger 캡처
    final messenger = ScaffoldMessenger.of(context);

    try {
      final clubService = Provider.of<ClubService>(context, listen: false);
      final club = clubService.currentClub;

      if (club != null) {
        // 기본 업데이트 데이터 준비
        final Map<String, dynamic> updates = {
          'clubId': club.id,
          'name': _nameController.text.trim(),
        };

        // 빈 문자열이 아닌 경우에만 추가 (null 값 명시적 처리)
        if (_descriptionController.text.trim().isNotEmpty) {
          updates['description'] = _descriptionController.text.trim();
        } else if (_descriptionController.text.trim().isEmpty &&
            club.description != null) {
          // 기존에 값이 있었는데 지금 비어있으면 명시적으로 null 설정
          updates['description'] = null;
        }

        if (_locationController.text.trim().isNotEmpty) {
          updates['location'] = _locationController.text.trim();
        } else if (_locationController.text.trim().isEmpty &&
            club.location != null) {
          updates['location'] = null;
        }

        if (_femaleHandicapController.text.trim().isNotEmpty) {
          updates['femaleHandicap'] = int.parse(
            _femaleHandicapController.text.trim(),
          );
        }

        if (_selectedAverageCalculationPeriod != null) {
          updates['averageCalculationPeriod'] =
              _selectedAverageCalculationPeriod;
        }

        if (_selectedOwnerId != null) {
          updates['ownerId'] = _selectedOwnerId;
        }

        // 모임장 변경 시에만 이메일 정보 추가
        if (_selectedOwnerId != club.ownerId) {
          // 모임장이 변경된 경우 해당 회원의 이메일 정보 찾기
          final selectedMember = _members.firstWhere(
            (member) => member.userId == _selectedOwnerId,
            orElse: () => Member(
              id: '',
              userId: '',
              name: '',
              memberType: '',
              clubId: club.id,
              email: '',
              isActive: true,
            ),
          );

          // 이메일이 있는 경우에만 추가 (빈 문자열이나 null은 전송하지 않음)
          if (selectedMember.email.isNotEmpty) {
            updates['ownerEmail'] = selectedMember.email;
          }
        }

        await clubService.updateClub(club.id, updates);

        messenger.showSnackBar(
          const SnackBar(content: Text('클럽 정보가 성공적으로 저장되었습니다')),
        );
      }
    } catch (error) {
      messenger.showSnackBar(
        SnackBar(content: Text('클럽 정보 저장 중 오류가 발생했습니다: $error')),
      );
    } finally {
      if (mounted) {
        setState(() {
          _isLoading = false;
        });
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('클럽 설정')),
      body: _isLoading
          ? const Center(child: CircularProgressIndicator())
          : Column(
              children: [
                if (!_hasEditPermission)
                  Container(
                    width: double.infinity,
                    padding: const EdgeInsets.all(16.0),
                    color: Colors.amber.shade100,
                    child: const Text(
                      '권한 알림: 클럽 설정을 변경하려면 클럽 소유자 또는 관리자 권한이 필요합니다.',
                      style: TextStyle(fontWeight: FontWeight.bold),
                    ),
                  ),
                Expanded(
                  child: SingleChildScrollView(
                    padding: const EdgeInsets.all(16.0),
                    child: Form(
                      key: _formKey,
                      child: Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: [
                          // 클럽 이름
                          TextFormField(
                            controller: _nameController,
                            decoration: const InputDecoration(
                              labelText: '클럽 이름',
                              border: OutlineInputBorder(),
                            ),
                            validator: (value) {
                              if (value == null || value.trim().isEmpty) {
                                return '클럽 이름을 입력해주세요';
                              }
                              return null;
                            },
                            enabled: _hasEditPermission,
                          ),
                          // 설명
                          const SizedBox(height: 16),
                          TextFormField(
                            controller: _descriptionController,
                            decoration: const InputDecoration(
                              labelText: '설명',
                              border: OutlineInputBorder(),
                            ),
                            maxLines: 3,
                            enabled: _hasEditPermission,
                          ),
                          // 위치
                          const SizedBox(height: 16),
                          TextFormField(
                            controller: _locationController,
                            decoration: const InputDecoration(
                              labelText: '위치',
                              border: OutlineInputBorder(),
                            ),
                            enabled: _hasEditPermission,
                          ),
                          // 여성 기본 핸디캡
                          const SizedBox(height: 16),
                          TextFormField(
                            controller: _femaleHandicapController,
                            decoration: const InputDecoration(
                              labelText: '여성 기본 핸디캡',
                              border: OutlineInputBorder(),
                            ),
                            keyboardType: TextInputType.number,
                            validator: (value) {
                              if (value != null && value.isNotEmpty) {
                                final handicap = int.tryParse(value);
                                if (handicap == null) {
                                  return '숫자를 입력해주세요';
                                }
                                if (handicap < 0) {
                                  return '0 이상의 값을 입력해주세요';
                                }
                              }
                              return null;
                            },
                            enabled: _hasEditPermission,
                          ),
                          // 평균 산정 기준
                          const SizedBox(height: 16),
                          DropdownButtonFormField<String>(
                            key: const Key('club_settings_avg_period_dropdown'),
                            decoration: const InputDecoration(
                              labelText: '평균 산정 기준',
                              border: OutlineInputBorder(),
                            ),
                            value: _selectedAverageCalculationPeriod,
                            isExpanded: true,
                            items: averageCalculationPeriodOptions.entries
                                .map(
                                  (entry) => DropdownMenuItem<String>(
                                    value: entry.key,
                                    child: Text(
                                      entry.value,
                                      maxLines: 1,
                                      overflow: TextOverflow.ellipsis,
                                    ),
                                  ),
                                )
                                .toList(),
                            onChanged: _hasEditPermission
                                ? (value) {
                                    setState(() {
                                      _selectedAverageCalculationPeriod = value;
                                    });
                                  }
                                : null,
                          ),
                          // 모임장 설정
                          const SizedBox(height: 16),
                          OwnerDropdown(
                            key: const Key('owner_dropdown'),
                            members: _members,
                            value: _selectedOwnerId,
                            enabled: _hasEditPermission,
                            onChanged: (value) {
                              if (!_hasEditPermission) return;
                              setState(() {
                                _selectedOwnerId = value;
                              });
                            },
                            onItemsBuilt: widget.onOwnerItemsBuilt,
                          ),
                          // 저장 버튼
                          const SizedBox(height: 24),
                          SizedBox(
                            width: double.infinity,
                            child: ElevatedButton(
                              onPressed: _hasEditPermission
                                  ? _saveClubInfo
                                  : null,
                              style: ElevatedButton.styleFrom(
                                padding: const EdgeInsets.symmetric(
                                  vertical: 16.0,
                                ),
                              ),
                              child: const Text('저장'),
                            ),
                          ),
                        ],
                      ),
                    ),
                  ),
                ),
              ],
            ),
    );
  }
}