import 'package:json_annotation/json_annotation.dart';
part 'task.g.dart';

@JsonSerializable()
class Task {
  final String id;
  final String userId;
  final String title;
  final String? description;
  final String status; // pending, in_progress, completed, skipped, archived
  final int priority; // 0-100, ML-adjusted
  final String energyLevel; // low, medium, high
  final int? estimatedMinutes;
  final int? actualMinutes;
  final DateTime? dueAt;
  final DateTime? completedAt;
  final String? parentTaskId;
  final double? dopamineScore; // ML-computed 0-100
  final double noveltyFactor; // decays over time
  final DateTime? lastInteracted;
  final int timesPostponed;
  final List<String> tags;
  final String? category;
  final String? color;
  final int version;
  final DateTime createdAt;
  final DateTime? updatedAt;

  const Task({
    required this.id,
    required this.userId,
    required this.title,
    this.description,
    this.status = 'pending',
    this.priority = 0,
    this.energyLevel = 'medium',
    this.estimatedMinutes,
    this.actualMinutes,
    this.dueAt,
    this.completedAt,
    this.parentTaskId,
    this.dopamineScore,
    this.noveltyFactor = 1.0,
    this.lastInteracted,
    this.timesPostponed = 0,
    this.tags = const [],
    this.category,
    this.color,
    this.version = 1,
    required this.createdAt,
    this.updatedAt,
  });

  factory Task.fromJson(Map<String, dynamic> json) => _$TaskFromJson(json);
  Map<String, dynamic> toJson() => _$TaskToJson(this);
}