var assignValue = require('./_assignValue'),
    copyObject = require('./_copyObject'),
    createAssigner = require('./_createAssigner'),
    isArrayLike = require('./isArrayLike'),
    isPrototype = require('./_isPrototype'),
    keys = require('./keys');

/** Used for built-in method references. */
var objectProto = Object.prototype;

/** Used to check objects for own properties. */
var hasOwnProperty = objectProto.hasOwnProperty;

/** Built-in value references. */
var propertyIsEnumerable = objectProto.propertyIsEnumerable;

/** Detect if properties shadowing those on `Object.prototype` are non-enumerable. */
var nonEnumShadows = !propertyIsEnumerable.call({ 'valueOf': 1 }, 'valueOf');

/**
 * Assigns own enumerable string keyed properties of source objects to the
 * destination object. Source objects are applied from left to right.
 * Subsequent sources overwrite property assignments of previous sources.
 *
 * **Note:** This method mutates `object` and is loosely based on
 * [`Object.assign`](https://mdn.io/Object/assign).
 *
 * @static
 * @memberOf _
 * @since 0.10.0
 * @category Object
 * @param {Object} object The destination object.
 * @param {...Object} [sources] The source objects.
 * @returns {Object} Returns `object`.
 * @example
 *
 * function Foo() {
 *   this.c = 3;
 * }
 *
 * function Bar() {
 *   this.e = 5;
 * }
 *
 * Foo.prototype.d = 4;
 * Bar.prototype.f = 6;
 *
 * _.assign({ 'a': 1 }, new Foo, new Bar);
 * // => { 'a': 1, 'c': 3, 'e': 5 }
 */
var assign = createAssigner(function(object, source) {
  if (nonEnumShadows || isPrototype(source) || isArrayLike(source)) {
    copyObject(source, keys(source), object);
    return;
  }
  for (var key in source) {
    if (hasOwnProperty.call(source, key)) {
      assignValue(object, key, source[key]);
    }
  }
});

module.exports = assign;