'use strict';
var isObj = require('is-obj');

var hasOwnProperty = Object.prototype.hasOwnProperty;
var propIsEnumerable = Object.prototype.propertyIsEnumerable;

function toObject(val) {
	if (val === null || val === undefined) {
		throw new TypeError('Cannot convert undefined or null to object');
	}

	return Object(val);
}

function assignKey(to, from, key) {
	var val = from[key];

	if (val === undefined || val === null) {
		return;
	}

	if (hasOwnProperty.call(to, key)) {
		if (to[key] === undefined || to[key] === null) {
			throw new TypeError('Cannot convert undefined or null to object (' + key + ')');
		}
	}

	if (!hasOwnProperty.call(to, key) || !isObj(val)) {
		to[key] = val;
	} else {
		to[key] = assign(Object(to[key]), from[key]);
	}
}

function assign(to, from) {
	if (to === from) {
		return to;
	}

	if(typeof to === 'function' || typeof from === 'function') {
		to = from;
	}else {
		from = Object(from);

		for (var key in from) {
			if (hasOwnProperty.call(from, key)) {
				assignKey(to, from, key);
			}
		}
	
		if (Object.getOwnPropertySymbols) {
			var symbols = Object.getOwnPropertySymbols(from);
	
			for (var i = 0; i < symbols.length; i++) {
				if (propIsEnumerable.call(from, symbols[i])) {
					assignKey(to, from, symbols[i]);
				}
			}
		}
	}

	return to;
}

module.exports = function deepAssign(target) {
	if(!target) {
		return null;
	}
	target = toObject(target);

	for (var s = 1; s < arguments.length; s++) {
		assign(target, arguments[s]);
	}

	return target;
};