class Supplement {
  final int? id;
  final String name;
  final double dosageAmount; // Amount per unit (e.g., 187mg)
  final int numberOfUnits; // Number of units to take (e.g., 2 capsules)
  final String unit; // mg, g, ml, etc.
  final String unitType; // capsules, tablets, ml, etc.
  final int frequencyPerDay;
  final List<String> reminderTimes; // e.g., ['08:00', '20:00']
  final String? notes;
  final DateTime createdAt;
  final bool isActive;

  Supplement({
    this.id,
    required this.name,
    required this.dosageAmount,
    required this.numberOfUnits,
    required this.unit,
    required this.unitType,
    required this.frequencyPerDay,
    required this.reminderTimes,
    this.notes,
    required this.createdAt,
    this.isActive = true,
  });

  // Helper getter for total dosage per intake
  double get totalDosagePerIntake => dosageAmount * numberOfUnits;

  Map<String, dynamic> toMap() {
    return {
      'id': id,
      'name': name,
      'dosageAmount': dosageAmount,
      'numberOfUnits': numberOfUnits,
      'unit': unit,
      'unitType': unitType,
      'frequencyPerDay': frequencyPerDay,
      'reminderTimes': reminderTimes.join(','),
      'notes': notes,
      'createdAt': createdAt.toIso8601String(),
      'isActive': isActive ? 1 : 0,
    };
  }

  factory Supplement.fromMap(Map<String, dynamic> map) {
    return Supplement(
      id: map['id'],
      name: map['name'],
      dosageAmount: map['dosageAmount']?.toDouble() ?? map['dosage']?.toDouble() ?? 0.0, // Backwards compatibility
      numberOfUnits: map['numberOfUnits'] ?? 1, // Default to 1 for backwards compatibility
      unit: map['unit'],
      unitType: map['unitType'] ?? 'units', // Default unit type for backwards compatibility
      frequencyPerDay: map['frequencyPerDay'],
      reminderTimes: map['reminderTimes'].split(','),
      notes: map['notes'],
      createdAt: DateTime.parse(map['createdAt']),
      isActive: map['isActive'] == 1,
    );
  }

  Supplement copyWith({
    int? id,
    String? name,
    double? dosageAmount,
    int? numberOfUnits,
    String? unit,
    String? unitType,
    int? frequencyPerDay,
    List<String>? reminderTimes,
    String? notes,
    DateTime? createdAt,
    bool? isActive,
  }) {
    return Supplement(
      id: id ?? this.id,
      name: name ?? this.name,
      dosageAmount: dosageAmount ?? this.dosageAmount,
      numberOfUnits: numberOfUnits ?? this.numberOfUnits,
      unit: unit ?? this.unit,
      unitType: unitType ?? this.unitType,
      frequencyPerDay: frequencyPerDay ?? this.frequencyPerDay,
      reminderTimes: reminderTimes ?? this.reminderTimes,
      notes: notes ?? this.notes,
      createdAt: createdAt ?? this.createdAt,
      isActive: isActive ?? this.isActive,
    );
  }
}