function nbMembers(envelope) {
    return getMembers(envelope).length;
}

function getMembers(envelope) {
    const members = [];
    const fields = ["from", "to", "sender", "replyTo", "cc", "bcc"];
    fields.forEach((field) => {
        if (!envelope[field]) return;
        envelope[field].forEach((member) => {
            if (members.find((m) => m.mailbox === member.mailbox && m.host === member.host)) return;
            members.push(member);
        });
    });
    return members;
}

module.exports = {
    nbMembers,
    getMembers,
};