backend/src/services/trainService.services.js

const log     = require('../utils/log.utils');
const db      = require('./dbAccess.services');
const clean   = require('../utils/sanitizer.utils');

async function findByHeadcode(headcode) {
  const sanitizedHeadcode = clean.removeNonAlphanumeric(headcode);
  log.out(`trainServiceServices.findByHeadcode: Searching for headcode ${sanitizedHeadcode}`, 'dbug');
  const now = new Date();
  const dayMap = ['su', 'm', 't', 'w', 'th', 'f', 's'];
  const shortDay = dayMap[now.getDay()]; // Fetch short day from map
  const query = {
    headcode: sanitizedHeadcode,
    scheduleStartDate: {$lte: now},
    scheduleEndDate: {$gte: now},
    daysRun: {$in: [shortDay]}
  };
  // At this point, the returned objects need sorting to ensure the correct object is returned.
  // C, N, O, P is the order - C being the preferred, then N, then O and finally P.
  return db.query('timetable', query);
}

module.exports = {
  findByHeadcode,
};