exports.convertUnit = function (item, units, store) {

    if(!(item.unit in units)) {
        console.error(`Unknown unit in ${store}: '${item.unit}' in item ${item.name}`);
        return item;
    }

    if(typeof(item.quantity) == 'string')
        item.quantity = parseFloat(item.quantity.replace(',', '.'));

    const conv = units[item.unit];
    item.quantity = conv.factor * item.quantity;
    item.unit = conv.unit;

    if(item.isWeighted && (item.unit =='g' || item.unit == 'ml')) {
        item.price = 100*item.price/item.quantity;
        item.quantity = 100;
    }
    return item;
}

exports.parseUnitAndQuantityAtEnd = function (name) {
    let unit, quantity = 1;
    const nameTokens = name.trim().replaceAll('(','').replaceAll(')','').replaceAll(',', '.').split(' ');
    const lastToken = nameTokens[nameTokens.length-1];
    const secondLastToken = nameTokens.length >= 2 ? nameTokens[nameTokens.length-2] : null;

    const token = parseFloat(lastToken) ? lastToken : secondLastToken + lastToken;
    const regex = /^([0-9.x]+)(.*)$/;
    const matches = token.match(regex);
    if(matches) {
      matches[1].split('x').forEach( (q)=> {
        quantity = quantity * parseFloat(q)
      })
      unit = matches[2];
      return [quantity, unit.toLowerCase()];
    }
    return [undefined, undefined];
}