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noel.js
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noel.js
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const util = require('util')
const nodemailer = require('nodemailer')
const crypto = require('crypto')
const fs = require('fs')
const config = require('./config.js')
const debug = !~process.argv.indexOf('send')
const verbose = ~process.argv.indexOf('-v')
const transporter = nodemailer.createTransport(config.smtp)
const people = config.people
function compute () {
const results = {}
const choices = [...people].map(e => e.name)
for (let i = 0, len = choices.length; i < len; i++) {
const person = people[i]
let filtered = choices.filter(e => e !== person.name)
let index = Math.floor(Math.random() * filtered.length);
//there is a probability the last one is itself
if (filtered.length === 0 && i === people.length - 1) {
return compute()
}
results[person.name] = filtered[index];
choices.splice(choices.findIndex(e => e === filtered[index]), 1)
}
return results
}
const results = compute()
const promises = []
for(let i in results) {
const person = people.find(e => e.name === i)
const givesTo = people.find(e => e.name === results[i])
const mailOptions = {
from: config.from,
to: person.email,
subject: config.subject(person, givesTo),
html: config.message(person, givesTo)
}
promises.push(new Promise((resolve, reject) => {
if (!debug) {
transporter.sendMail(mailOptions, function(error, info) {
if (error) { return reject(error) }
resolve(info)
})
return
}
if (verbose) {
console.log(`
From: ${mailOptions.from}
To: ${mailOptions.to}
Subject: ${mailOptions.subject}
Message:
${mailOptions.html}
==================================================`)
resolve()
} else {
resolve()
}
}))
}
Promise.all(promises)
.then(function() {
if (!debug) {
console.log('All sent!');
} else {
for (let i in results) {
console.log(`${i} => ${results[i]}`)
}
}
process.exit(0)
})
.catch(function(err) {
console.log('Whoops, an error occured!')
console.log(err);
process.exit(1)
})