export function normalizeHeader(value: string): string {
  return value
    .toLowerCase()
    .normalize('NFD')
    .replace(/[\u0300-\u036f]/g, '')
    .replace(/[^a-z0-9 ]/gi, '')
    .trim()
    .replace(/\s+/g, '_');
}

export function cleanNum(value: unknown): number {
  if (value === null || value === undefined || value === '') return NaN;
  if (typeof value === 'number') return value;
  const str = String(value).trim().replace(/[^0-9.\-]/g, '');
  if (str === '' || str === '-' || str === '.') return NaN;
  const num = Number(str);
  return Number.isFinite(num) ? num : NaN;
}

export function normalizeRow(row: Record<string, unknown>): Record<string, unknown> {
  const out: Record<string, unknown> = {};
  for (const key in row) {
    const newKey = normalizeHeader(key);
    let val = row[key];
    if (typeof val === 'string') val = val.trim();
    out[newKey] = val;
  }
  return out;
}