import path from 'path';

import dedent from 'dedent';

import loopback from 'loopback';

import moment from 'moment';

export const renderSignUpEmail = loopback.template(

path.join(

__dirname,

'..',

'..',

'server',

'views',

'emails',

'user-request-sign-up.ejs'

)

);

export const renderSignInEmail = loopback.template(

path.join(

__dirname,

'..',

'..',

'server',

'views',

'emails',

'user-request-sign-in.ejs'

)

);

export const renderEmailChangeEmail = loopback.template(

path.join(

__dirname,

'..',

'..',

'server',

'views',

'emails',

'user-request-update-email.ejs'

)

);

export function getWaitPeriod(ttl) {

const fiveMinutesAgo = moment().subtract(5, 'minutes');

const lastEmailSentAt = moment(new Date(ttl || null));

const isWaitPeriodOver = ttl

? lastEmailSentAt.isBefore(fiveMinutesAgo)

: true;

if (!isWaitPeriodOver) {

const minutesLeft = 5 - (moment().minutes() - lastEmailSentAt.minutes());

return minutesLeft;

}

return 0;

}

export function getWaitMessage(ttl) {

const minutesLeft = getWaitPeriod(ttl);

if (minutesLeft <= 0) {

return null;

}

const timeToWait = minutesLeft

? `${minutesLeft} minute${minutesLeft > 1 ? 's' : ''}`

: 'a few seconds';

return dedent`

Please wait ${timeToWait} to resend an authentication link.

`;

}

export function getEncodedEmail(email) {

if (!email) {

return null;

}

return Buffer.from(email).toString('base64');

}

export const decodeEmail = email => Buffer.from(email, 'base64').toString();