#!/bin/env node

'use strict';

const p = require('path');
const crypto = require('crypto');

const chalk = require('chalk');

const MongoClient = require('mongodb').MongoClient;

const successPrefix = '[' + chalk.green('SUCCESS') + '] ';
const errorPrefix = '[' + chalk.red('ERROR') + '] ';

global.PWD = p.dirname(__dirname);
global.ENV = process.env.NODE_ENV || 'development';

function _mongo(collection, cb) {
	const mongoConfig = require(p.join(PWD, 'server/config/mongo'));

	MongoClient.connect(mongoConfig.uri, function (err, db) {
		if (err) {
			console.error(errorPrefix);
			console.error(err);
			process.exit(1);
		}
		cb(db.collection(collection), db);
	});
}


const SALT_LENGTH = 16;

function _hash(password) {
	// generate salt
	password = password.trim();
	const chars = '0123456789abcdefghijklmnopqurstuvwxyz';
	let salt = '';
	for (let i = 0; i < SALT_LENGTH; i++) {
		const j = Math.floor(Math.random() * chars.length);
		salt += chars[j];
	}

	// hash the password
	const passwordHash = crypto.createHash('sha512').update(salt + password).digest('hex');

	// entangle the hashed password with the salt and save to the model
	return _entangle(passwordHash, salt, password.length);
}

function _entangle(string, salt, t) {
	string = salt + string;
	const length = string.length;

	const arr = string.split('');
	for (let i = 0; i < salt.length; i++) {
		const num = ((i + 1) * t) % length;
		const tmp = arr[i];
		arr[i] = arr[num];
		arr[num] = tmp;
	}

	return arr.join('');
}

function createUser(email, password, roles) {
	if (!email || !password) {
		console.log('Usage: bin/create-user.js [email] [password] [?roles]');
		process.exit(1);
	}


	const user = {
		email: email,
		local: {
			password: _hash(password)
		},
		roles: roles ? roles.split(',') : [ 'admin' ],
		isVerified: true,
		dateCreated: new Date()
	};

	_mongo('users', function (users, db) {
		users.insert(user, function (err, user) {
			db.close();
			if (err) {
				console.error(errorPrefix);
				console.error(err);
				process.exit(1);
			} else {
				console.log(successPrefix + 'Saved user: ' + user.ops[0].email);
				process.exit(0);
			}
		});
	});
}

createUser.apply(null, process.argv.slice(2));