var assert = require('chai').assert,

Sandbox = require('javascript-sandbox'),

jshint = require('jshint').JSHINT;

function readCookie(name) {

var nameEQ = name + "=";

var ca = document.cookie.split(';');

for(var i=0;i < ca.length;i++) {

var c = ca[i];

while (c.charAt(0)==' ') c = c.substring(1,c.length);

if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);

}

return null;

}

function verify(code) {

if (!jshint('/* jshint asi:true */' + code)) {

var error = jshint.errors[0];

if (!error.message) {

error.message = 'Looks like there is a syntax error in your code: ' + error.reason || error.raw;

}

if (error.message.match(/Missing semicolon/)) return;

if (error.message.match(/Expected an assignment or function call and instead saw an expression/)) return;

it('f_jshint_error', function() {

assert(false, error.message);

});

}

}

var state = {};

// getOwnPropertyNames doesn't work in IE 8 and below.

if (Object.getOwnPropertyNames(state).length === 0) {

var courseState = readCookie('course_state'),

tryName = readCookie('try_name');

if (courseState) {

state = JSON.parse(decodeURIComponent(courseState));

} else if (tryName) {

state.username = tryName;

}

}

module.exports = {

assert: assert,

verify: verify,

Sandbox: Sandbox,

activeSandbox: new Sandbox(),

state: state,

evaluate: function(code) {

return this.activeSandbox.evaluate(code);

},

restoreName: function() {

try {

this.evaluate('firstName;');

} catch(e) {

this.evaluate('var firstName = "' + this.state.username + '";');

}

}

};