import { DomainEntity, MoneyValue, Percentage, UniqueID } from "@common/domain";
import { Quantity } from "@common/domain/value-objects/quantity";
import { Maybe, Result } from "@common/helpers";

export interface ICustomerInvoiceItemProps {
  description: Maybe<string>; // Descripción del artículo o servicio
  quantity: Quantity; // Cantidad de unidades
  unitPrice: MoneyValue; // Precio unitario en la moneda de la factura
  // subtotalPrice: MoneyValue; // Precio unitario * Cantidad
  discount: Percentage; // % descuento
  // totalPrice: MoneyValue;
}

export interface ICustomerInvoiceItem {
  description: Maybe<string>;
  quantity: Quantity;
  unitPrice: MoneyValue;
  subtotalPrice: MoneyValue;
  discount: Percentage;
  totalPrice: MoneyValue;
}

export class CustomerInvoiceItem
  extends DomainEntity<ICustomerInvoiceItemProps>
  implements ICustomerInvoiceItem
{
  public static create(
    props: ICustomerInvoiceItemProps,
    id?: UniqueID
  ): Result<CustomerInvoiceItem, Error> {
    return Result.ok(new CustomerInvoiceItem(props, id));
  }

  get description(): Maybe<string> {
    return this.props.description;
  }

  get quantity(): Quantity {
    return this.props.quantity;
  }

  get unitPrice(): MoneyValue {
    return this.props.unitPrice;
  }

  get subtotalPrice(): MoneyValue {
    return this.quantity.isNull() || this.unitPrice.isNull()
      ? MoneyValue.create({ amount: null, scale: 2 }).object
      : this.unitPrice.multiply(this.quantity.toNumber());
  }

  get discount(): Percentage {
    return this.props.discount;
  }

  get totalPrice(): MoneyValue {
    return this.subtotalPrice.isNull()
      ? MoneyValue.create({ amount: null, scale: 2 }).object
      : this.subtotalPrice.subtract(this.subtotalPrice.percentage(this.discount.toNumber()));
  }
}