import { cleanDoc, normDateStr, toUTCms } from './helpers.mjs';

// Parsea una línea (nombres preservados)
export function parseLine(line) {
  const raw = String(line || '').replace(/\r/g, '').trim();
  if (!raw) return null;

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

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

  // Si no alcanzan 7 campos, intentar fallback con dos o más espacios
  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;

  // 0:No, 1:Mchn, 2:EnNo(doc), 3:Name, 4:Mode, 5:Fecha, 6:Hora
  const DOC_IDX  = 2;
  const NAME_IDX = 3;
  const MODE_IDX = 4;

  const doc  = cleanDoc(parts[DOC_IDX]);
  const name = String(parts[NAME_IDX] || '').trim();
  const mode = String(parts[MODE_IDX] || '').trim();

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

  // Caso: 7 columnas y última es "DateTime"
  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);               // YY/MM/DD o YYYY/MM/DD -> YYYY-MM-DD
  if (!iso || !/^\d{1,2}:\d{2}:\d{2}$/.test(timeStr)) return null;

  const [H, M, S] = timeStr.split(':').map(n => parseInt(n, 10));
  // mantener construcción local solo por paridad con el snippet original
  // eslint-disable-next-line no-unused-vars
  const dt = new Date(`${iso}T${String(H).padStart(2,'0')}:${String(M).padStart(2,'0')}:${String(S).padStart(2,'0')}`);

  return {
    doc, name,
    isoDate: iso,
    time: timeStr,
    dt_ms: toUTCms(iso, timeStr),   // ⬅️ clave
    mode
  };
}