// parser.mjs
import { normDateStr, toUTCms } from '../../core/utils/dates.mjs';
import { cleanDoc, normTime } from '../../core/utils/docs.mjs';

/**
 * Parsea una línea con prioridad por TAB; si no hay, cae a espacios;
 * separa fecha/hora si vienen juntas.
 * Devuelve { doc, name, isoDate, time, dt_ms, mode } o null.
 */
export function parseLine(line) {
  const raw = String(line || '').replace(/\r/g, '').trim();
  if (!raw) return null;

  // omitir encabezados comunes
  if (/^no[\t ]|^mchn[\t ]|^enno[\t ]|^name[\t ]|^datetime[\t ]/i.test(raw)) return null;

  let parts = raw.split(/\t+/);

  // Fallback: dos o más espacios + DateTime al final
  if (parts.length < 7) {
    const dtMatch = raw.match(/(\d{2,4}[\/-]\d{1,2}[\/-]\d{1,2})\s+(\d{1,2}:\d{2}:\d{2})$/);
    if (dtMatch) {
      const head = raw.slice(0, dtMatch.index).trim();
      const headParts = head.split(/\t+|\s{2,}/).filter(Boolean);
      parts = [...headParts, dtMatch[1], dtMatch[2]];
    } else {
      parts = raw.split(/\s{2,}/).filter(Boolean);
    }
  }
  if (parts.length < 7) return null;

  // Indices "normales": 0:No, 1:Mchn, 2:EnNo(doc), 3:Name, 4:Mode, 5:Fecha, 6:Hora
  const doc  = cleanDoc(parts[2]);
  const name = String(parts[3] || '').trim();
  const mode = String(parts[4] || '').trim();

  let dateStr = String(parts[5] || '').trim();
  let timeStr = String(parts[6] || '').trim();

  // Caso: la última columna es "YYYY/MM/DD HH:MM:SS"
  const last = parts[parts.length - 1];
  const dtBoth = /(\d{2,4}[\/-]\d{1,2}[\/-]\d{1,2})\s+(\d{1,2}:\d{2}:\d{2})/.exec(last);
  if (dtBoth) { dateStr = dtBoth[1]; timeStr = dtBoth[2]; }
  else if (!timeStr && /\d{1,2}:\d{2}:\d{2}/.test(dateStr)) {
    const m = dateStr.match(/^(.+?)\s+(\d{1,2}:\d{2}:\d{2})$/);
    if (m) { dateStr = m[1]; timeStr = m[2]; }
  }

  const iso = normDateStr(dateStr);
  const timeNorm = normTime(timeStr);
  if (!iso || !timeNorm) return null;

  return { doc, name, isoDate: iso, time: timeNorm, dt_ms: toUTCms(iso, timeNorm), mode };
}