import 'task.dart';

class KnowledgeItem {
  final int id;
  final String noteType; // 'note' | 'person' | 'place' | 'list' | 'task'
  final String title;
  final String body;
  final List<String> tags;
  final int? projectId;
  final int? milestoneId;
  final int? parentId;
  // Task-only fields (null for non-tasks)
  final String? status;   // 'todo' | 'in_progress' | 'done' | 'cancelled'
  final String? priority; // 'low' | 'normal' | 'high'
  final String? dueDate;
  final DateTime createdAt;
  final DateTime updatedAt;

  const KnowledgeItem({
    required this.id,
    required this.noteType,
    required this.title,
    required this.body,
    required this.tags,
    this.projectId,
    this.milestoneId,
    this.parentId,
    this.status,
    this.priority,
    this.dueDate,
    required this.createdAt,
    required this.updatedAt,
  });

  factory KnowledgeItem.fromTask(Task task) => KnowledgeItem(
        id: task.id,
        noteType: 'task',
        title: task.title,
        body: task.description ?? '',
        tags: const [],
        projectId: task.projectId,
        milestoneId: task.milestoneId,
        parentId: task.parentId,
        status: task.status.value,
        priority: task.priority.value,
        dueDate: task.dueDate?.toIso8601String(),
        createdAt: task.createdAt,
        updatedAt: task.updatedAt,
      );

  factory KnowledgeItem.fromJson(Map<String, dynamic> json) => KnowledgeItem(
        id: json['id'] as int,
        noteType: json['note_type'] as String? ?? 'note',
        title: json['title'] as String? ?? '',
        body: (json['snippet'] ?? json['body']) as String? ?? '',
        tags: (json['tags'] as List<dynamic>?)
                ?.map((e) => e as String)
                .toList() ??
            [],
        projectId: json['project_id'] as int?,
        milestoneId: json['milestone_id'] as int?,
        parentId: json['parent_id'] as int?,
        status: json['status'] as String?,
        priority: json['priority'] as String?,
        dueDate: json['due_date'] as String?,
        createdAt: DateTime.parse(json['created_at'] as String),
        updatedAt: DateTime.parse(json['updated_at'] as String),
      );
}