73 lines
2.1 KiB
TypeScript
73 lines
2.1 KiB
TypeScript
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import { TaxCatalogProvider } from "@erp/core";
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import Dinero, { Currency } from "dinero.js";
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export interface InvoiceItemCalcInput {
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quantity?: string; // p.ej. "3.5"
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unit_amount?: string; // p.ej. "125.75"
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discount_percentage?: string; // p.ej. "10" (=> 10%)
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tax_codes: string[]; // ["iva_21", ...]
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}
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export interface InvoiceItemCalcResult {
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subtotal_amount: number;
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discount_amount: number;
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taxable_amount: number;
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taxes_amount: number;
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total_amount: number;
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}
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/**
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* Cálculo financiero exacto por línea de factura.
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* Usa Dinero.js (base 10^2 y round half up) → resultados seguros en céntimos.
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*/
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export function calculateInvoiceItemAmounts(
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item: InvoiceItemCalcInput,
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currency: string,
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taxCatalog: TaxCatalogProvider
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): InvoiceItemCalcResult {
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const scale = 4;
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const toDinero = (n: number) =>
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Dinero({
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amount: n === 0 ? 0 : Math.round(n * 10 ** scale),
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precision: scale,
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currency: currency as Currency,
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});
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const qty = Number.parseFloat(item.quantity || "0") || 0;
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const unit = Number.parseFloat(item.unit_amount || "0") || 0;
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const pct = Number.parseFloat(item.discount_percentage || "0") || 0;
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// Subtotal = cantidad × precio unitario
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const subtotal = toDinero(qty * unit);
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// Descuento = subtotal × (pct / 100)
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const discount = subtotal.percentage(pct);
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// Base imponible
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const taxable = subtotal.subtract(discount);
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// Impuestos acumulados
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let taxes = toDinero(0);
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for (const code of item.tax_codes ?? []) {
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const tax = taxCatalog.findByCode(code);
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tax.map((taxItem) => {
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const pctValue = Number.parseFloat(taxItem.value) / 10 ** Number.parseInt(taxItem.scale, 10);
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const taxAmount = taxable.percentage(pctValue);
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taxes = taxes.add(taxAmount);
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});
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}
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const total = taxable.add(taxes);
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// Devuelve valores desescalados (número con 2 decimales exactos)
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const toNum = (d: Dinero.Dinero) => d.toUnit();
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return {
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subtotal_amount: toNum(subtotal),
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discount_amount: toNum(discount),
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taxable_amount: toNum(taxable),
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taxes_amount: toNum(taxes),
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total_amount: toNum(total),
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};
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}
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