var storage = require('node-persist');
var crypto = require('crypto-js');

storage.initSync();
var accounts = [];
var argv = require('yargs').command('create', 'Create a new entry in the password manager', function(yargs) {
    yargs.options({
        accountName: {
            demand: true,
            type: 'string',
            alias: 'a',
            description: 'Enter account name here i.e. facebook or email.'
        },
        username: {
            demand: true,
            alias: 'u',
            type: 'string',
            description: 'Enter the username for this account here.'
        },
        password: {
            demand: true,
            alias: 'p',
            type: 'string',
            description: 'Enter your password here'
        },
        masterPassword:{
            demand: true,
            alias: 'm',
            type: 'string',
            description: 'A master password which allows access to all account information'
        }
    })
}).help('help')
    .command('get', 'Here is where you will retrieve your account information', function(yargs) {
        yargs.options({
            accountName: {
                demand: true,
                alias: 'a',
                type: 'string',
                description: 'Use this command followed by the account name to retrieve your account information.'
            },
            masterPassword:{
                demand: true,
                alias: 'm',
                type: 'string',
                description: 'A master password which allows access to all account information'
            }
        });
    }).help('help')
    .argv;

var command = argv._[0];

function saveAccounts (accounts, masterPassword) {

	// encrypt accounts
	var encryptedAccounts = crypto.AES.encrypt(JSON.stringify(accounts), masterPassword);

	// setItemSync
	storage.setItemSync('accounts', encryptedAccounts.toString());

	// return accounts
	return accounts;
}

function getAccounts (masterPassword) {

	// use getItemSync to fetch accounts
	var encryptedAccount = storage.getItemSync('accounts');
	var accounts = [];

	// decrypt
	if (typeof encryptedAccount !== 'undefined') {
		var bytes = crypto.AES.decrypt(encryptedAccount, masterPassword);
		accounts = JSON.parse(bytes.toString(crypto.enc.Utf8));
	}

	// return accounts array
	return accounts;
}

function createAcount(account, masterPassword) {
    accounts = getAccounts(masterPassword);
    accounts.push(account);
    saveAccounts(accounts, masterPassword);
    return account;
}

function getAccount(accountName, masterPassword) {
    var accounts = getAccounts(masterPassword);
    var matchedAccount;
    accounts.forEach(function(account) {
        if (account.name === accountName) {
            matchedAccount = account;
        }
    });
    console.log(matchedAccount);
}

if (command === 'create' && typeof argv.accountName !== 'undefined' && typeof argv.username !== 'undefined' && typeof argv.password !== 'undefined') {
    createAcount({
        name: argv.accountName,
        username: argv.username,
        password: argv.password
    }, argv.masterPassword);

} else if (command === 'get' && typeof argv.accountName !== 'undefined') {
    getAccount(argv.accountName, argv.masterPassword);
} else if (command === 'get' && typeof argv.accountName === 'undefined') {
    console.log('That account does not exist in the password manager.');
}