class Ingredient {
  final int? id;
  final String name; // e.g., "Vitamin K2", "Vitamin D3"
  final double amount; // e.g., 75, 20
  final String unit; // e.g., "mcg", "mg", "IU"

  const Ingredient({
    this.id,
    required this.name,
    required this.amount,
    required this.unit,
  });

  Map<String, dynamic> toMap() {
    return {
      'id': id,
      'name': name,
      'amount': amount,
      'unit': unit,
    };
  }

  factory Ingredient.fromMap(Map<String, dynamic> map) {
    return Ingredient(
      id: map['id'],
      name: map['name'],
      amount: map['amount']?.toDouble() ?? 0.0,
      unit: map['unit'],
    );
  }

  Ingredient copyWith({
    int? id,
    String? name,
    double? amount,
    String? unit,
  }) {
    return Ingredient(
      id: id ?? this.id,
      name: name ?? this.name,
      amount: amount ?? this.amount,
      unit: unit ?? this.unit,
    );
  }

  @override
  String toString() {
    return '$amount$unit $name';
  }

  @override
  bool operator ==(Object other) {
    if (identical(this, other)) return true;
    return other is Ingredient &&
        other.name == name &&
        other.amount == amount &&
        other.unit == unit;
  }

  @override
  int get hashCode {
    return name.hashCode ^ amount.hashCode ^ unit.hashCode;
  }
}