'use strict';

/* eslint no-invalid-this: 1 */

var ERROR_MESSAGE = 'Function.prototype.bind called on incompatible ';
var slice = Array.prototype.slice;
var toStr = Object.prototype.toString;
var funcType = '[object Function]';

module.exports = function bind(that) {
 var target = this;
 if (typeof target !== 'function' || toStr.call(target) !== funcType) {
 throw new TypeError(ERROR_MESSAGE + target);
 }
 var args = slice.call(arguments, 1);

 var bound;
 var binder = function () {
 if (this instanceof bound) {
 var result = target.apply(
 this,
 args.concat(slice.call(arguments))
 );
 if (Object(result) === result) {
 return result;
 }
 return this;
 } else {
 return target.apply(
 that,
 args.concat(slice.call(arguments))
 );
 }
 };

 var boundLength = Math.max(0, target.length - args.length);
 var boundArgs = [];
 for (var i = 0; i < boundLength; i++) {
 boundArgs.push('$' + i);
 }

 bound = Function('binder', 'return function (' + boundArgs.join(',') + '){ return binder.apply(this,arguments); }')(binder);

 if (target.prototype) {
 var Empty = function Empty() {};
 Empty.prototype = target.prototype;
 bound.prototype = new Empty();
 Empty.prototype = null;
 }

 return bound;
};