const log  = require('../utils/log.utils');            // Log Helper
const db   = require('../services/dbAccess.services'); // DB Access
const san  = require('../utils/sanitizer.utils');     // Sanitiser

async function checkCrs(input){
  var INPUT = input.toUpperCase();
  var query = {
    '$or':[
      {'3ALPHA':INPUT},
      {'TIPLOC':INPUT},
      {'STANOX':INPUT}
    ]
  };
  var result = await db.query('stations', query);
  log.out('ldbUtils.checkCrs: Query results: ' +
          JSON.stringify(result), 'dbug');
  return result;
}

// Needs to be moved to the frontend `ensureArray() func`
async function cleanMessages(input){
  log.out('ldbUtils.cleanMessages: Deprecated function has been called', 'err');
  var out = [];
  if (typeof input.message == 'string') {
    out.push(await san.cleanNrcc(input.message));
  } else if (typeof input.message == 'object') {
    for(var i = 0; i < input.message.length; i++) {
      out.push(await san.cleanNrcc(input.message[i]));
    }
  }
  return out;
}

// Accepts an object but not an Array and returns it wrapped in an array.
async function cleanServices(input){
  log.out('ldbUtils.cleanServices: Deprecated function has been called', 'err');
  var out = [];
  if (!Array.isArray(input)) {
    log.out(`ldbUtils.cleanServices: Transforming input: ${input}`, 'dbug');
    out.push(input);
    log.out(`ldbUtils.cleanServices: Returning output: ${out}`, 'dbug');
    return out;
  } else {
    return input;
  }
}

async function cleanData(input) {
  try {
    if (input?.GetStationBoardResult?.trainServices) {
      log.out('ldbUtils.cleanData: Changing train service data to array','dbug');
      input.GetStationBoardResult.trainServices.service = await ensureArray(input.GetStationBoardResult.trainServices.service);
    }
    if (input?.GetStationBoardResult?.busServices) {
      log.out('ldbUtils.cleanData: Changing bus service data to array','dbug');
      input.GetStationBoardResult.busServices.service = await ensureArray(input.GetStationBoardResult.busServices.service);
    }
    if (input?.GetStationBoardResult?.ferryServices) {
      log.out('ldbUtils.cleanData: Changing ferry service data to array','dbug');
      input.GetStationBoardResult.ferryServices.service = await ensureArray(input.GetStationBoardResult.ferryServices.service);
    }
  } catch (err) {
    log.out(`ldbUtils.cleanData: Error: ${err}`, 'eror');
  }
  return input;
}

async function ensureArray(data) {
  if (!Array.isArray(data)) {
    return [data];
  }
  return data;
}

module.exports = {
  checkCrs,
  cleanMessages,
  cleanServices,
  cleanData
};