class WeightModel {
  final String name;
  final double weight;
  final DateTime date;
  final String id;
  final double weightChange;

  WeightModel({
    required this.weight,
    required this.date,
    required this.id,
    required this.weightChange, required this.name,
  });

  static WeightModel fromJson(Map<String, dynamic> json) {
    return WeightModel(
      weight: json['weight'],
      date: DateTime.parse(json['date']),
      id: json['id'],
      weightChange: json['weightChange'], name: json['name'],
    );
  }

  static Map<String, dynamic> toJson(WeightModel weightModel) {
    return {
      'weight': weightModel.weight,
      'date': weightModel.date.toIso8601String(),
      'id': weightModel.id,
      'weightChange': weightModel.weightChange,
      'name': weightModel.name,
    };
  }

  // An empty instance for initialization or default values
  static final empty = WeightModel(
    weight: 0.0,
    date: DateTime.now(),
    id: '00',
    weightChange: 0.0, name: 'Joe',
  );

  // Sample data for testing and demonstration purposes
  static List<WeightModel> sampleData = [
    WeightModel(
      weight: 70.0,
      date: DateTime(2024, 1, 1),
      id: '01',
      weightChange: 0.0, name: 'Joe',
    ),
    WeightModel(
      weight: 69.5,
      date: DateTime(2024, 1, 15),
      id: '02',
      weightChange: -0.5, name: 'Joe',
    ),
    WeightModel(
      weight: 68.0,
      date: DateTime(2024, 2, 1),
      id: '03',
      weightChange: -1.5, name: 'Joe',
    ),
    WeightModel(
      weight: 100.0,
      date: DateTime(2024, 1, 1),
      id: '04',
      weightChange: 0.0, name: 'Karl',
    ),
    WeightModel(
      weight: 95.5,
      date: DateTime(2024, 1, 15),
      id: '05',
      weightChange: -4.5, name: 'Karl',
    ),
    WeightModel(
      weight: 90.0,
      date: DateTime(2024, 2, 1),
      id: '06',
      weightChange: -5.5, name: 'Karl',
    ),
  ];
}