class InvoiceItem {
  final int? id;
  final int invoiceId;
  final int productId;
  final int quantity;
  final double unitPrice;
  final double discount;

  InvoiceItem({
    this.id,
    required this.invoiceId,
    required this.productId,
    required this.quantity,
    required this.unitPrice,
    required this.discount,
  });

  Map<String, dynamic> toMap() {
    return {
      'id': id,
      'invoice_id': invoiceId,
      'product_id': productId,
      'quantity': quantity,
      'unit_price': unitPrice,
      'discount': discount,
    };
  }

  factory InvoiceItem.fromMap(Map<String, dynamic> map) {
    return InvoiceItem(
      id: map['id'] as int?,
      invoiceId: map['invoice_id'] as int,
      productId: map['product_id'] as int,
      quantity: map['quantity'] as int,
      unitPrice: map['unit_price'] as double,
      discount: map['discount'] as double,
    );
  }
}