var compareAscending = require('./_compareAscending');

/**

* Used by `_.orderBy` to compare multiple properties of a value to another
* and stable sort them.
*
* If `orders` is unspecified, all values are sorted in ascending order. Otherwise,
* specify an order of "desc" for descending or "asc" for ascending sort order
* of corresponding values.
*
* @private
* @param {Object} object The object to compare.
* @param {Object} other The other object to compare.
* @param {boolean[]|string[]} orders The order to sort by for each property.
* @returns {number} Returns the sort order indicator for `object`.
*/

function compareMultiple(object, other, orders) {

var index = -1,
    objCriteria = object.criteria,
    othCriteria = other.criteria,
    length = objCriteria.length,
    ordersLength = orders.length;

while (++index < length) {
  var result = compareAscending(objCriteria[index], othCriteria[index]);
  if (result) {
    if (index >= ordersLength) {
      return result;
    }
    var order = orders[index];
    return result * (order == 'desc' ? -1 : 1);
  }
}
// Fixes an `Array#sort` bug in the JS engine embedded in Adobe applications
// that causes it, under certain circumstances, to provide the same value for
// `object` and `other`. See https://github.com/jashkenas/underscore/pull/1247
// for more details.
//
// This also ensures a stable sort in V8 and other engines.
// See https://bugs.chromium.org/p/v8/issues/detail?id=90 for more details.
return object.index - other.index;

}

module.exports = compareMultiple;