packages/invoice/src/utils/pdf-format.ts

import { formatAmount } from "@midday/utils/format";

/**
 * Workaround for react-pdf negative currency formatting issue.
 * React-pdf strips minus signs from Intl.NumberFormat formatted currency values.
 * This function manually handles negative values by formatting the absolute value
 * and prepending the minus sign for negative amounts.
 *
 * @param amount - The numeric amount to format
 * @param currency - The currency code (e.g., "USD", "EUR", "SEK")
 * @param locale - The locale for formatting (e.g., "en-US", "sv-SE")
 * @param maximumFractionDigits - Maximum number of decimal places
 * @returns Properly formatted currency string with minus sign preserved
 */
export function formatCurrencyForPDF({
  amount,
  currency,
  locale,
  maximumFractionDigits,
}: {
  amount: number;
  currency: string;
  locale?: string;
  maximumFractionDigits?: number;
}): string {
  if (!currency) return "";

  const isNegative = amount < 0;
  const absoluteAmount = Math.abs(amount);

  // Format the absolute value using the standard formatAmount function
  const formatted = formatAmount({
    currency,
    amount: absoluteAmount,
    locale,
    maximumFractionDigits,
  });

  // Manually prepend minus sign for negative values
  return isNegative ? `-${formatted}` : formatted || "";
}