var apply = require('./_apply'),
    mergeDefaults = require('./_mergeDefaults'),
    mergeWith = require('./mergeWith'),
    rest = require('./rest');

/**
 * This method is like `_.defaults` except that it recursively assigns
 * default properties.
 *
 * **Note:** This method mutates `object`.
 *
 * @static
 * @memberOf _
 * @category Object
 * @param {Object} object The destination object.
 * @param {...Object} [sources] The source objects.
 * @returns {Object} Returns `object`.
 * @example
 *
 * _.defaultsDeep({ 'user': { 'name': 'barney' } }, { 'user': { 'name': 'fred', 'age': 36 } });
 * // => { 'user': { 'name': 'barney', 'age': 36 } }
 *
 */
var defaultsDeep = rest(function(args) {
  args.push(undefined, mergeDefaults);
  return apply(mergeWith, undefined, args);
});

module.exports = defaultsDeep;