// Preserve typed input; never delete a decimal separator and change its value.
export function parseBidPrice(value) {
  if (typeof value === 'number') return Number.isFinite(value) && value >= 0 ? value : null;
  const text = String(value ?? '').trim();
  const plain = /^\d+(?:[.,]\d{1,8})?$/;
  const groupedTurkish = /^\d{1,3}(?:\.\d{3})+,\d{1,8}$/;
  if (!plain.test(text) && !groupedTurkish.test(text)) return null;
  const normalized = text.includes(',') ? text.replace(/\./g,'').replace(',','.') : text;
  const result = Number(normalized);
  return Number.isFinite(result) ? result : null;
}
export function quantityParts(value) {
  if (typeof value === 'number') return {miktar:Number.isFinite(value) ? value : null,birim:''};
  const match = /^\s*([+-]?[\d]+(?:[.,]\d+)*)\s+(.+?)\s*$/.exec(String(value || ''));
  if (!match) return {miktar:null,birim:''};
  const raw = match[1];
  const normalized = raw.includes(',') ? raw.replace(/\./g,'').replace(',','.')
    : /^\d{1,3}(?:\.\d{3})+$/.test(raw) ? raw.replace(/\./g,'') : raw;
  const number = Number(normalized);
  return {miktar:Number.isFinite(number) ? number : null,birim:match[2]};
}
export const roundMoney = n => Math.round((n + Number.EPSILON) * 100) / 100;
export function bidRowTotal(row) {
  const {miktar} = quantityParts(row.quantity);
  const price = parseBidPrice(row.birimFiyat);
  const total = miktar * price;
  return miktar > 0 && price > 0 && Number.isFinite(total) && total <= Number.MAX_SAFE_INTEGER / 100 ? roundMoney(total) : null;
}
export function validateBidRows(rows) {
  if (!rows.length) return ['Resmi teklif cetvelindeki kalemler eksik.'];
  return rows.flatMap((row,i) => {
    const {miktar,birim} = quantityParts(row.quantity);
    return (!row.name?.trim() || !(miktar > 0) || !birim || bidRowTotal(row) === null)
      ? [`${i+1}. kalemin adı, miktarı, birimi veya fiyatı eksik/geçersiz.`] : [];
  });
}