Amigo Secreto - Exemplo Final

game.ts

import participants from "./participants.json"
import nodemailer from "nodemailer"

interface ParticipantProps {
    name: string;
    email: string;
    not?: string[];
}

interface ParticipantsSortedProps extends ParticipantProps {
    chosen: ParticipantProps;
}

class AmigoSecreto {
    shuffle(array: ParticipantProps[]): ParticipantProps[] {
        let currentIndex: number = array.length
        let temporaryValue;
        let randomIndex;

        while (0 !== currentIndex) {
            randomIndex = Math.floor(Math.random() * currentIndex);
            currentIndex -= 1;

            temporaryValue = array[currentIndex];
            array[currentIndex] = array[randomIndex];
            array[randomIndex] = temporaryValue;
        }

        return array;
    }

    sortParticipants(): ParticipantsSortedProps[] {
        if(participants.length < 3){
            throw new Error("Número de participantes insuficiente")
        }

        let shuffledParticipants = [];

        do {
            const shuffled = this.shuffle(participants.map((item) => ({email: item.email, name: item.name})))
            shuffledParticipants = participants.map((p, i) => ({
                ...p,
                chosen: {email: shuffled[i].email, name: shuffled[i].name}
            }))
        } while (shuffledParticipants.some(person => {
            const chosenHimself = person.email === person.chosen.email
            const notAllowed = person.not != null && person.not.some(n => n === person.chosen.name)
            return (chosenHimself || notAllowed)
        }))

        return shuffledParticipants;
    }

    async sendMail(participants: ParticipantsSortedProps[]) {
        let transporter = nodemailer.createTransport({
            host: "HOST",
            port: 465,
            secure: true,
            auth: {
                user: "EMAIL",
                pass: "SENHA",
            },
        });

        const tasks = [];
        for (const participant of participants) {
            tasks.push(transporter.sendMail({
                from: '"Amigo Secreto 👀"',
                to: participant.email,
                subject: "Amigo Secreto - Você tirou...",
                text: `Olá ${participant.name}! Você tirou o(a) participante ${participant.chosen.name}`,
            }));
        }

        await Promise.all(tasks)
        return true;
    }
}

const amigoSecreto = new AmigoSecreto()

const sortedParticipants = amigoSecreto.sortParticipants()
amigoSecreto.sendMail(sortedParticipants)
    .then(() => console.log("Emails enviados com sucesso!"))
    .catch((err) => console.log(err))