/** Strip invisible bidi / ZWNJ chars that render as tofu in embedded Arabic fonts. */
export function normalizePersianPdfText(text: string): string {
  return text
    .replace(/\u200c/g, " ")
    .replace(/[\u200e\u200f\u202a-\u202e\u2066-\u2069\ufeff]/g, "")
    .replace(/\u2014/g, "-")
    .replace(/\s+/g, " ")
    .trim();
}

/**
 * pdfkit renders glyphs strictly left-to-right.
 * fontkit already reshapes each word's glyphs into visual (LTR) order,
 * but it does NOT reorder words — so a multi-word RTL string like
 * "نام صاحب خودرو" has its words placed LTR on the page and reads
 * backwards.  Reversing the word sequence here makes pdfkit emit the
 * words in the correct visual order for a right-to-left PDF reader.
 */
function reverseRtlWords(text: string): string {
  if (!/[\u0600-\u06FF]/.test(text)) return text;
  return text.split(" ").reverse().join(" ");
}

export function pdfKitRtlKeyValue(
  label: string,
  value: string,
): { label: string; value: string } {
  return {
    label: reverseRtlWords(normalizePersianPdfText(label)),
    value: reverseRtlWords(normalizePersianPdfText(value)),
  };
}

export function pdfKitRtlParagraph(text: string): string {
  return reverseRtlWords(normalizePersianPdfText(text));
}

export function isMostlyAscii(text: string): boolean {
  return text.length > 0 && !/[\u0600-\u06FF]/.test(text);
}