import 'package:freezed_annotation/freezed_annotation.dart';

part 'license_dto.freezed.dart';
part 'license_dto.g.dart';

// 날짜를 YYYY-MM-DD 형식으로 변환하는 헬퍼 함수
String? _dateToJson(DateTime? date) {
  if (date == null) return null;
  return '${date.year}-${date.month.toString().padLeft(2, '0')}-${date.day.toString().padLeft(2, '0')}';
}

// YYYY-MM-DD 형식 문자열을 DateTime으로 변환하는 헬퍼 함수
DateTime? _dateFromJson(String? dateStr) {
  if (dateStr == null || dateStr.isEmpty) return null;
  try {
    // YYYY-MM-DD 형식 파싱
    if (dateStr.contains('-') && dateStr.length == 10) {
      final parts = dateStr.split('-');
      return DateTime(int.parse(parts[0]), int.parse(parts[1]), int.parse(parts[2]));
    }
    // ISO 8601 형식도 지원
    return DateTime.parse(dateStr);
  } catch (e) {
    return null;
  }
}

// 필수 날짜 필드용 헬퍼 함수 (항상 non-null DateTime 반환)
DateTime _requiredDateFromJson(String? dateStr) {
  if (dateStr == null || dateStr.isEmpty) return DateTime.now();
  try {
    // YYYY-MM-DD 형식 파싱
    if (dateStr.contains('-') && dateStr.length == 10) {
      final parts = dateStr.split('-');
      return DateTime(int.parse(parts[0]), int.parse(parts[1]), int.parse(parts[2]));
    }
    // ISO 8601 형식도 지원
    return DateTime.parse(dateStr);
  } catch (e) {
    return DateTime.now();
  }
}

/// 라이선스 전체 정보 DTO
@freezed
class LicenseDto with _$LicenseDto {
  const factory LicenseDto({
    required int id,
    @JsonKey(name: 'license_key') required String licenseKey,
    @JsonKey(name: 'product_name') String? productName,
    String? vendor,
    @JsonKey(name: 'license_type') String? licenseType,
    @JsonKey(name: 'user_count') int? userCount,
    @JsonKey(name: 'purchase_date', toJson: _dateToJson, fromJson: _dateFromJson) DateTime? purchaseDate,
    @JsonKey(name: 'expiry_date', toJson: _dateToJson, fromJson: _dateFromJson) DateTime? expiryDate,
    @JsonKey(name: 'purchase_price') double? purchasePrice,
    @JsonKey(name: 'company_id') int? companyId,
    @JsonKey(name: 'branch_id') int? branchId,
    @JsonKey(name: 'assigned_user_id') int? assignedUserId,
    String? remark,
    @JsonKey(name: 'is_active') required bool isActive,
    @JsonKey(name: 'created_at') required DateTime createdAt,
    @JsonKey(name: 'updated_at') required DateTime updatedAt,
    // 추가 필드 (조인된 데이터)
    @JsonKey(name: 'company_name') String? companyName,
    @JsonKey(name: 'branch_name') String? branchName,
    @JsonKey(name: 'assigned_user_name') String? assignedUserName,
  }) = _LicenseDto;

  factory LicenseDto.fromJson(Map<String, dynamic> json) => _$LicenseDtoFromJson(json);
}

/// 라이선스 목록 응답 DTO
@freezed
class LicenseListResponseDto with _$LicenseListResponseDto {
  const factory LicenseListResponseDto({
    required List<LicenseDto> items,
    required int total,
    required int page,
    @JsonKey(name: 'per_page') required int perPage,
    @JsonKey(name: 'total_pages') required int totalPages,
  }) = _LicenseListResponseDto;

  factory LicenseListResponseDto.fromJson(Map<String, dynamic> json) => 
      _$LicenseListResponseDtoFromJson(json);
}

/// 만료 예정 라이선스 DTO
@freezed
class ExpiringLicenseDto with _$ExpiringLicenseDto {
  const factory ExpiringLicenseDto({
    required int id,
    @JsonKey(name: 'license_key') required String licenseKey,
    @JsonKey(name: 'product_name') String? productName,
    String? vendor,
    @JsonKey(name: 'expiry_date', fromJson: _requiredDateFromJson) required DateTime expiryDate,
    @JsonKey(name: 'days_until_expiry') required int daysUntilExpiry,
    @JsonKey(name: 'assigned_user_id') int? assignedUserId,
    @JsonKey(name: 'company_id') int? companyId,
    @JsonKey(name: 'company_name') String? companyName,
    @JsonKey(name: 'assigned_user_name') String? assignedUserName,
    @JsonKey(name: 'is_active', defaultValue: true) bool? isActive,
  }) = _ExpiringLicenseDto;

  factory ExpiringLicenseDto.fromJson(Map<String, dynamic> json) => 
      _$ExpiringLicenseDtoFromJson(json);
}

/// 만료 예정 라이선스 목록 응답 DTO
@freezed
class ExpiringLicenseListDto with _$ExpiringLicenseListDto {
  const factory ExpiringLicenseListDto({
    required List<ExpiringLicenseDto> items,
    required int total,
    required int page,
    @JsonKey(name: 'per_page') required int perPage,
    @JsonKey(name: 'total_pages') required int totalPages,
  }) = _ExpiringLicenseListDto;

  factory ExpiringLicenseListDto.fromJson(Map<String, dynamic> json) =>
      _$ExpiringLicenseListDtoFromJson(json);
}