/// 知识点模型

class KnowledgeNode {
  final String code;
  final String name;
  final List<KnowledgeNode> children;
  final String? fullPath;
  final bool isLeaf;

  KnowledgeNode({
    required this.code,
    required this.name,
    this.children = const [],
    this.fullPath,
    this.isLeaf = false,
  });

  factory KnowledgeNode.fromJson(Map<String, dynamic> json) {
    return KnowledgeNode(
      code: json['code'] ?? '',
      name: json['name'] ?? '',
      children: (json['children'] as List<dynamic>?)
              ?.map((c) => KnowledgeNode.fromJson(c as Map<String, dynamic>))
              .toList() ??
          [],
      fullPath: json['full_path'],
      isLeaf: json['full_path'] != null || (json['children'] == null || (json['children'] as List).isEmpty),
    );
  }
}